15W 5V Evaluation board using ICE3A1065ELJ

A p p l i c a t i o n N o t e , V 1 . 1 , A u g 2 0 1 0

AN-EVAL3A1065ELJ

1 5 W 5 . 0 V S M P S E v a l u a t i o n B o a r d w i t h

CoolSET

®

F 3 I C E 3 A 1 0 6 5 E L J

P o w e r M a n a g e m e n t & S u p p l y

N e v e r s t o p t h i n k i n g .

Edition 2010-08-11

Published by Infineon Technologies Asia Pacific,

168 Kallang Way,

349253 Singapore, Singapore

© Infineon Technologies AP 2008.

All Rights Reserved.

Attention please!

The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics.

Terms of delivery and rights to technical change reserved.

We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein.

Information

For further information on technology, delivery terms and conditions and prices please contact your nearest

Infineon Technologies Office (www.infineon.com).

Warnings

Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office.

Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

15W 5V Demo board using ICE3A1065ELJ on board

Revision History: 2010-08-11

V1.1

Previous Version:

Page

1, 5, 11

1.0

Subjects (major changes since last revision)

Change demo board name to EVAL3A1065ELJ

15W 5.0V SMPS Evaluation Board with CoolSET

®

F3 ICE3A1065ELJ:

License to Infineon Technologies Asia Pacific Pte Ltd

Kyaw Zin Min

Kok Siu Kam Eric

We Listen to Your Comments

Any information within this document that you feel is wrong, unclear or missing at all?

Your feedback will help us to continuously improve the quality of this document.

Please send your proposal (including a reference to this document) to: [email protected]

AN-PS0021

1

2

3

4

5

6

6.1

6.2

7

7.1

7.2

7.3

7.4

7.5

7.6

7.7

7.8

7.8.1

7.8.2

7.8.3

7.9

7.9.1

7.9.2

8

9

11

11.1

11.2

11.3

11.4

11.5

11.6

11.7

11.8

11.9

11.10

11.11

10

10.1

10.2

10.3

10.4

10.5

10.6

10.7

10.8

12

12.1

13

15W 5V Demoboard using ICE3A1065ELJ on board

Table of Contents Page

Abstract..........................................................................................................................................5

Evaluation Board...........................................................................................................................5

List of Features .............................................................................................................................6

Technical Specifications ..............................................................................................................6

Circuit Diagram .............................................................................................................................7

PCB Layout ....................................................................................................................................9

Component side component legend ...............................................................................................9

Solder side copper & component legend ........................................................................................9

Circuit Description ......................................................................................................................11

Introduction....................................................................................................................................11

Line Input.......................................................................................................................................11

Start up & auxiliary supply circuit ..................................................................................................11

RCD Clamper circuit .....................................................................................................................11

Peak primary current control circuit ..............................................................................................11

Output Stage of secondary side....................................................................................................11

Feedback and regulation...............................................................................................................12

Particular features .........................................................................................................................12

Blanking Window for Load Jump & Active Burst Mode.................................................................12

Active Burst Mode .........................................................................................................................12

Frequency jitter mode ...................................................................................................................12

Protection modes ..........................................................................................................................13

Auto restart mode..........................................................................................................................13

Latch off mode...............................................................................................................................13

Component List ...........................................................................................................................14

Transformer Construction..........................................................................................................15

Test Results .................................................................................................................................16

Efficiency .......................................................................................................................................16

Input Standby Power.....................................................................................................................17

Line Regulation .............................................................................................................................18

Load Regulation ............................................................................................................................19

Max. Overload Output Power........................................................................................................19

Electrostatic Discharge Test (ESD)...............................................................................................20

Lightning Surge Test .....................................................................................................................20

Conducted EMI Test .....................................................................................................................20

Waveforms and scope plots ......................................................................................................22

Startup @ low and high AC line input voltage and 15W load .......................................................22

Drain to source voltage and current during 15W load operation ..................................................23

Load transient response (Load jump from 10% to 100%) ............................................................23

AC output ripple during 15W .........................................................................................................24

Active Burst Mode @ light load.....................................................................................................25

Vcc overvoltage protection (latch off mode)..................................................................................26

Overload protection without/with extended blanking time (auto restart mode).............................27

Open loop protection (auto restart mode) .....................................................................................28

Vcc under voltage/Short optocoupler protection (auto restart mode) ...........................................28

External latch off enable................................................................................................................29

Frequency Jittering........................................................................................................................29

Appendix ......................................................................................................................................30

Slope compensation for CCM operation .......................................................................................30

References ...................................................................................................................................30

Application Note 4 2010-08-11

15W 5V Demoboard using ICE3A1065ELJ

1 Abstract

This document is an engineering report that describes a universal input power supply designed in a 5V 15W off line SMPS flyback converter topology that utilizes the ICE3A1065ELJ CoolSET

®1

. The application board is designed for discontinuous conduction mode (DCM) with current mode controller IC and running at 100 kHz switching frequency. It has one output voltage with secondary control regulation. It is especially suitable for small power supply such as DVD player, set-top box, game console, charger and auxiliary power for high power system, etc. The ICE3A1065ELJ is an enhanced version of the F3 CoolSET

®

especially in robustness to the system noise such as ESD, lightning surge, etc. Besides having the basic features of the F3 CoolSET

® such as Active Burst Mode, propagation delay compensation, soft gate drive, latch off protection for serious fault (Vcc OVP, OTP and short winding) and auto-restart protection for general fault (OLP and Open loop), etc., it also has the BiCMOS technology design, built-in soft start time, built-in and extendable blanking time, frequency jitter feature with built-in jitter period and external latch enable pin, etc. The particular good features are the extremely low standby input power, the low EMI performance and the robustness to the system noise.

Figure 1

– EVAL3A1065ELJ

This document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction drawing. Typical operating characteristics are presented at the rear of the report and it consists of performance curves and scope waveforms.

1

CoolSET

®

is a current mode PWM control IC and the power MOSFET CoolMOS

®

within one package designed for low cost switch mode power supplies (SMPS).



3 List of Features

650V avalanche rugged CoolMOS

®

with built-in Startup Cell

Active Burst Mode for lowest Standby Power

Fast load jump response in Active Burst Mode

100kHz internally fixed switching frequency

Built-in latched Off Mode for Overtemperature, Overvoltage & Short Winding Detection

Auto Restart Mode for Overload, Open Loop & VCC Undervoltage

Built-in Soft Start

Built-in and extendable blanking Window for short duration high current

External latch enable function

Max Duty Cycle 75%

Overall tolerance of Current Limiting < ±5%

Internal PWM Leading Edge Blanking

BiCMOS technology provide wide VCC range

Frequency jitter and soft driving for low EMI

Robustness to system noise such as ESD, lightning surge, etc.

Input voltage

Input frequency

Input Standby Power

Output voltage and current

Output current

Output power

Efficiency

Output ripple voltage

Application Note

85VAC~265VAC

50Hz, 60Hz

<100mW @ no load; < 0.8W @ 0.5W load

5V +/- 2%

3.0A

15W

>75% at full load

< 50mVp-p

6 2010-08-11


Application Note

Figure 2

– 15W 5.0V ICE3A1065ELJ power supply Schematic

7 2010-08-11


N.B. : In order to get the optimized performance of the CoolSET connected very carefully. From the circuit diagram above, it indicates that the grounding for the

CoolSET

®

®

, the grounding of the PCB layout must be

can be split into several groups; signal ground, Vcc ground, Current sense resistor ground and EMI return ground. All the split grounds should be connected to the bulk capacitor ground separately.

•

Signal ground includes all small signal grounds connecting to the CoolSET

® capacitor ground, C6, C7, C8 and optocoupler ground.

GND pin such as filter

•

Vcc ground includes the Vcc capacitor ground, C9 and the auxiliary winding ground, pin 2 of the power transformer.

•

Current Sense resistor ground includes current sense resistor R4 and R4A.

•

EMI return ground includes Y capacitor, C4.



6.1 Component side component legend

Figure 3

– Component side Component Legend – View from Component Side

6.2 Solder side copper & component legend

Application Note

Figure 4

– Solder side copper – View from Component Side

9 2010-08-11


Figure 5

– Solder side component Legend – View from Component Side



7.1 Introduction

The EVAL3A1065ELJ demoboard is a low cost off line flyback switch mode power supply (SMPS) using the

ICE3A1065ELJ system IC from the CoolSET

®

-F3 family. The circuit, shown in Figure 2, details a 5.0V, 15W power supply that operates from an AC line input voltage range of 85Vac to 265Vac, suitable for applications requiring either an open frame supply or an enclosed adapter.

The AC line input side comprises the input fuse F1 as over-current protection. The common mode choke L1,

X2-capacitor C1 and Y1-capacitor C4 act as EMI suppressors. Spark gap device SG1 and SG2 can absorb high voltage stress during lightning surge test. After the bridge rectifier BR1 and the input bulk capacitor C2, a voltage of 100 to 380 V

DC

is present which changed with input voltage.

7.3 Start up & auxiliary supply circuit

Since there is a built-in startup cell in the ICE3A1065ELJ, there is no need for external start up resistor. The startup cell is connecting the Drain pin of the IC. Once the voltage is built up at the Drain pin of the

ICE3A1065ELJ, the startup cell will charge up the Vcc capacitor C5 and C6. When the Vcc voltage exceeds the UVLO at 18V, the IC starts up. Then the Vcc voltage is bootstrapped by the auxiliary winding to sustain the operation.

During operation, the Vcc pin is supplied via a separate transformer winding with associated rectification D2 and buffering C5 and C6. Resistor R3 & R5 is used for current limiting. In order not to exceed the maximum voltage at Vcc pin an external zenor diode ZD1 and resistor R6 are added.

The Soft-Start is a built-in function and is set at 20ms. There is no need for extra components.

7.4 RCD Clamper circuit

While turning off the internal CoolMOS

®

, the clamper circuit R2, C3 and D1 absorbs the current caused by transformer leakage inductance once the voltage exceeds clamper circuit voltage. Then the Drain to Source voltage is well below the maximum break down voltage (V

(BR)DSS

= 650V

1

) of internal CoolMOS

®

.

7.5 Peak primary current control circuit

The drain to source current of the internal CoolMOS

®

is sensed via external shunt resistors R4 and R4A. An accurate value of the shunt together with the IC’s propagation delay compensation control can effectively improve the peak power control between high line and low line which is shown in the peak power limitation curve in the rear part of the report.

7.6 Output Stage of secondary side

On the secondary side of the system the power is coupled out by a schottky diode D21. The capacitor C21 provides energy buffering following with the LC filter L21 and C22 to reduce the output voltage ripple considerably. Storage capacitor C21 is a high ripple current electrolytic capacitor which has a very low ESR and can reduce the output voltage ripple. L22 and C24 can help to suppress the high transient voltage spike during Electrostatic Discharge (ESD) test.

1

V

(BR)DSS

= 650V @ Tj = 110°C



7.7 Feedback and regulation

The output voltage is controlled using a TL431 reference diode IC (IC3). This device incorporates the voltage reference as well as the error amplifier and a driver stage. Compensation network Cc1, Cc2, Rc1, Rc2, Rc3,

Rc3A and Rc4 constitute the external circuitry of the error amplifier of IC3. This circuitry allows the feedback to be precisely matched to dynamically varying load conditions, thereby providing stable control. The maximum current through the optocoupler diode and the voltage reference is set by using resistors Rc5 and

Rc6. Optocoupler IC2 is used for floating transmission of the control signal to the “Feedback” input via capacitor C8 of the ICE3A1065ELJ control device. The selected optocoupler meets DIN VDE 884 requirements for a wider creepage distance. C8 is a noise filtering capacitor. It should be as small as possible so that it can reduce the noise and at the same time provide fast response to the output.

7.8.1

Blanking Window for Load Jump & Active Burst Mode

In case of Load Jumps the Controller provides a Blanking Window before activating the Over Load

Protection. There are 2 modes for the blanking time setting; basic mode and the extendable mode. If there is no capacitor added to the BL pin, it would fall into the basic mode; i.e. the blanking time is set at 20ms. If a longer blanking time is required, it should go to the extendable mode, where a capacitor, C7 should be added to BL pin. The extended blanking time can be achieved by charging the C7 at BL pin from 0.9V to

4.0V with an internal 8.4uA constant current source. Thus the overall blanking time is the addition of 20ms and the extended time. For example, C7=10nF, I

BK

(internal current source)=8.4uA. The voltage at Feedback pin will rise up to exceed 4.5V without switching off the IC under over load condition when it is within the blanking time frame. At that period the transferred power is limited to the maximum peak current defined by the value of the current sense resistor, R4 and R4A.

Blanking time (total) = 20ms + C7 X (4-0.9)/I

BK

= 23.7ms

Note: A noise filtering capacitor ( at least 100pF ) may be needed to add to the BL pin if the noises cannot be avoided to enter that pin in the physical PCB layout. Otherwise, some protection features may be mistriggered and the system may not be working properly.

The blanking time to enter the Active Burst Mode is built-in 20ms with no extension. If a low load condition is detected when V

FB time while V

FB

is falling below 1.35V, the system will only enter Active Burst Mode after 20ms blanking

is still below 1.35V.

7.8.2

Active Burst Mode

At light load condition, the SMPS enters into Active Burst Mode. The controller is always active at this state.

V

CC

must be designed higher than the Vcc switch off threshold V

V

OUT

CCoff

≥ 10.5V. While supporting low ripple on

and fast response on load jump, efficiency also increased significantly during Active Burst Mode. When the voltage level at FB falls below 1.35V, the internal blanking timer starts to count. When it reaches 20ms and the FB voltage is still below 1.35V, it will enter Active Burst Mode. The Blanking Window is generated to avoid a sudden entering of Burst Mode due to load jump.

During Active Burst Mode the current sense voltage limit is reduced from 1V to 0.31V so as to reduce the conduction losses. All the internal circuits are switched off except the reference and bias voltages to reduce the total V

CC

current consumption to below 0.45mA. At burst mode, the FB voltage is changing like a sawtooth between 3.0 and 3.61V. To leave Burst Mode, FB voltage must exceed 4.5V. It will reset the Active

Burst Mode and turn the SMPS into Normal Operating Mode. Maximum current can then be provided to stabilize V

OUT

.

7.8.3

Frequency jitter mode

The ICE3A1065ELJ has frequency jittering feature to reduce the EMI noise. The jitter frequency is internally set at 100 kHz +/-4 kHz and the jitter period is set at 4ms.



There are two kinds of protection modes for the device; auto-restart mode and the latch-off mode. The autorestart mode is for the general fault and the latch off mode is for the serious fault.

7.9.1 Auto restart mode

In the auto-restart mode, the gate switching is stopped and the Vcc voltage will drop. When it drops to 10.5V, the startup cell will turn on and charge up the Vcc capacitor to 18V. Then the startup cell turns off and the device will start the start up phase from soft start. However, if the fault persists, the device will enter the autorestart mode again. If the fault is removed, the device will return to normal mode in the next start up phase. A list of auto restart mode protections and the failure conditions are showed in the below table.

Protection function Protection Mode

Over-load / Open loop

Failure condition

V

FB

> 4.5V and V

BL

> 4.0V

(Blanking time counted from charging V

BA

from 0.9V to 4.0V together with the basic 20ms)

Auto Restart

Vcc Under-voltage / short

Optocoupler

Vcc < 10.5V Auto Restart

7.9.2 Latch off mode

The operation of latch-off mode is very similar to auto-restart mode but there is no startup phase when the

Vcc reach 18V. Since there is no switching energy from the auxiliary winding, the Vcc voltage will then drop to 10.5V. Then the startup cell charge sequence repeats again. The Vcc waveform during latch-off mode likes a saw-tooth shape. The latch-off mode can be reset if the Vcc voltage is lower than 6.23V. A list of latch off mode protections and the failure conditions are showed in the below table.

Protection function Failure condition Protection Mode

Vcc Over-voltage Vcc > 24V & V

FB

> 4.5V Latch Off

Over-temperature

(controller junction)

Short Winding/Short Diode

External latch enable

T

J

> 130°C

V

CS

> 1.66V

V

BL

< 0.1V

Latch Off

Latch Off

Latch Off



Items Part

1 BR1

2 C1

3 C2

4 C3

5 C4

6 C6

7 C7

8 C8

9 C9

10 C21

11 C22

12 C24

13 Cc1

14 Cc2

15 D1

16 D2

17 D21

18 F1

19 IC1

20 IC2

21 IC3

22 J1, J2, J3, J4, J5, J6

23 L1

24 L21

25 L22

26 R2

27 R3

28 R4

29 R4A

30 R5

31 R6

32 Rc1

33 Rc2

34 Rc3

35 Rc4

36 Rc5

37 Rc6

38 TR1

39 ZD1

Type

RS207, 2A 1000V

0.22uF/275V, X2 capacitor

47uF/400V

2n2F/400V

2.2nF/250V, Y1 capacitor

0.1u/50V

10nF/50V

1nF/50V

22u/50V

2200uF/35V

470uF/35V

0.1uF/50V

1uF/50V

1nF/50V

UF4005

1N4148

MBR745

ICE3A1065ELJ

SFH617A-3 1

TL431CLP

Jumper

2 x 27mH, 0.7A

1.5uH

2 x 100µH,(µi=10000,T38,R 6.30)

150K, 2W, 5%

0R, (SMD 0805)

R4 1.2R, 0.5W, 1%

27R, 0.1W, 5% ( 0805 SMD )

560R, 0.1W, 5% ( 0805 SMD )

39R, 0.1W, 5% ( 0805 SMD )

10K, 0.25W, 1%

10K, 0.25W, 1%

6.8K, 0.25W, 5%

1K, 5% ( 0805 SMD )

100R, 5% ( 0805 SMD )

EF20, N87, Lp=520uH

22V zener diode

Quantity Manufacturer

1 -

1

1

EPCOS

EPCOS

1

1

1

1

EPCOS

-

Murata

EPCOS

1

1

1

1

1

1

1

1

EPCOS

-

-

-

Murata

Murata

EPCOS

-

1

1

1

1

1

1

1

1

1

1

1

1

1

1

6

1

-

-

-

Infineon

-

-

-

EPCOS

1

1

1

1

1 NEC-Tokin

1 EPCOS

1

1

-

ROHM

-

ROHM

ROHM

ROHM

-

-

-

-

ROHM

ROHM

EPCOS

-



9 Transformer Construction

Core and material: EF20/10/6, N87

Bobbin: Horizontal type

Primary Inductance, Lp = 520µH measured between pin 4 and pin 5 (Gapped to Inductance)

Transformer structure:

Figure 6

– Transformer structure and top view of transformer complete

Wire size requirement:

Start Stop No. of turns Wire size Layer

2 1 10 2XAWG#32

3 4 /

2

Primary

9 6 4 3XAWG#26

5 3 /

2

Primary



10.1 Efficiency

Efficiency versus AC Line Input Voltage

85.00

80.00

75.6

75.00

70.00

77.4

78.3

78.7

78.5

78.2

85 115 150 180

AC Line Input Voltage [ Vac ]

Efficiency @ 15W output power

230

Figure 7

– Efficiency versus AC Line Input Voltage

265

85.00

80.00

75.8

75.00

75.6

79.8

78.1

Efficiency versus Output Power

78.8

78.9

78.7

78.4

78.5

77.4

Application Note

70.00

0 3.75 7.5

Output Power [ W ]

Vin=115Vac

Vin=230Vac

11.25

Figure 8

– Efficiency vs. Output Power @ 115 & 230 Vac

16

15

2010-08-11

10.2 Input Standby Power


Stanby Power @ no-load versus AC Line Input Voltage

50

40

30

20

10

17.51

17.91

18.74

19.47

23.30

35.07

0

85 115 150 180


230 265

Po = 0W

Figure 9

– Input Standby Power @ no load vs. AC Line Input Voltage ( measured by Yokogawa WT210 power meter – integration mode )

Standby Pow er @ 0.3W & 0.5W load versus AC Line Input Voltage

1.00

0.50

0.67

0.41

0.67

0.41

0.68

0.42

0.68

0.42

0.67

0.43

0.71

0.44

0.00

85 115 150 180


230 265

Po=0.3W

Po=0.5W

Figure 10

– Input Standby Power @ 0.3 and 0.5W load vs. AC Line Input Voltage ( measured by Yokogawa

WT210 power meter – integration mode )



Standby Pow er Efficiency @ 0.3W & 0.5W load versus AC Line Input Voltage

80

76.28

75.78

75.44

74.68

75.58

75

72.11

74.47

73.93

73.43

73.07

70

71.55

69.42

65

85 115 150 180


230 265

Po=0.3W

Po=0.5W

Figure 10

– Input Standby Power efficiency @ 0.3 and 0.5W load vs. AC Line Input Voltage

5.50

Line Regulation : Vo versus AC Line Input Voltage @ 15W load

5.02

5.03

5.03

5.03

5.03

5.00

5.03

Application Note

4.50

85 115 150 180


Vo @ 15W load

230

Figure 11

– Line Regulation vs. AC Line Input Voltage

265

18 2010-08-11


5.50

Load Regulation: Vout versus Load @ Vin = 230Vac

5.1

5.08

5.07

5.05

5.00

5.03

4.50

0 3.75

7.5

Output Pow er [ W ]

11.25

Output Voltage

Figure 12

– Load Regulation vs. AC Line Input Voltage

15

10.5 Max. Overload Output Power

25

Max. Overload Output & Input Pow er ( Peak Pow er ) versus AC Line Input Voltage

22.96

Pin=22.63W±1.4% & Po=16.9W±3.25%

22.51

22.33

22.31

22.61

22.95

20

16.75

16.85

16.95

17.20

17.45

16.35

15

85 115 150 180

AC Line Input Voltage [ V ]

Peak Output Power

230

Peak Input Power

265

Figure 13

– Maximum Overload Output & Input Power vs. AC Line Input Voltage



10.6 Electrostatic Discharge Test (ESD)

Pass 20kV ESD test (EN61000-4-2) in contact discharge.

10.7 Lightning Surge Test

Pass 8kV lightning surge test (EN61000-4-5) in Line to Earth.

* With the addition of SG1 & SG2 (DSP-301N-S008).

10.8 Conducted EMI Test

Pass CISPR 22 Class B EMI test.

The conducted EMI was measured by Schaffner (SMR4503) receiver under CISPR 22 class B test standard.

The demo board was tested with maximum load (15W) with input voltage of 115Vac and 230Vac.

80

EN_V_QP EN_V_AV QP Pre AV Pre

70

60

50

40

30

20

10

0

-10

0.1

-20

1 10 100 f / MHz

Figure 14

– Max. Load (15W) with 115 Vac (Line)



80

EN_V_QP

70

EN_V_AV QP Pre AV Pre

40

30

20

60

50

10

0

-10

0.1

-20

1 10

f / MHz

Figure 15

– Max. Load (15W) with 230 Vac (Neutral)

100



11 Waveforms and scope plots

All waveforms and scope plots were recorded with a LeCroy 6050 oscilloscope

11.1 Startup @ low and high AC line input voltage and 15W load

C1

C1

C2

C3

C4

C2

C3

C4

Channel 1; C1 : Drain to source voltage (V

DS

)

Channel 2; C2 : Supply voltage (V

CC

)

Channel 3; C3 : Feedback voltage (V

FB

)

Channel 4; C4 : BL voltage (V

BL

)

Startup time = 0.52s

Figure 16

– Startup @ Vin=85Vac and 15W load

C1


DS

)


CC

)


FB

)


BL

)

Startup time = 0.52s

Figure 17

– Startup @ Vin=265Vac and 15W load

C1

C2 C2

C3

C4

Z4

C3

C4

Z4

C4


DS

)

Channel 2; C2 : Supply Voltage (V

CC

)


FB

)

Channel 4; C4 : Current sense voltage (V

CS

)

Channel Z4; Zoom of Channel 4

Soft start time = 20ms


DS

)

Channel 2; C2 : Supply Voltage (V

CC

)


FB

)


CS

)

Channel Z4; Zoom of Channel 4

Soft start time = 20ms

Figure 18

– Soft Start @ Vin=85Vac and 15W load

Figure 19

– Soft Start @ Vin=265Vac and 15W load



11.2 Drain to source voltage and current during 15W load operation

C1

C1

C2 C2


DS

)

Channel 2; C2 : Drain to source current (I

DS

)

Duty cycle = 41.34%


DS

)

Channel 2; C2 : Drain to source current (I

DS

)

Duty cycle = 13.03%

Figure 16

– Operation @ Vin = 85Vac and 15W load

Figure 17

–Operation @ Vin = 265Vac and 15W load

11.3 Load transient response (Load jump from 10% to 100%)

C1 C1

C2 C2

Channel 1; C1 : Output voltage (Vo)

Channel 2; C2 : Output current (Io)

Current step slew rate = 0.4A/us

Figure 18

–

Load jump @ Vin=85Vac from 1.5W to 15W load

Channel 1; C1 : Output voltage (Vo)

Channel 2; C2 : Output current (Io)

Current step slew rate = 0.4A/us

Figure 19

–

Load jump @ Vin=265Vac from 1.5W to 15W load


11.4 AC output ripple during 15W


C1 C1

Channel 1; C1 : Output ripple voltage

Vo_ripple_pk_to_pk = 40mV

Probe terminal end with decoupling capacitor of 0.1uF(ceramic) +

10uF(Electrolytic), 20MHz filter

Figure 20

–

AC output ripple @ Vin=85Vac and 15W load





Figure 21

–

AC output ripple @ Vin=265Vac and 15W load


11.5 Active Burst Mode @ light load

C1


C1

C2

C2

C3

C4

C3

C4


DS

)


CC

)


FB

)


CS

)

Blanking time to enter burst mode : 19.4ms

Figure 22

– Active burst mode @ Vin=85Vac and step from 3A to 0.05A load


DS

)


CC

)


FB

)


CS

)

Blanking time to enter burst mode : 19.4ms

Figure 23

–

Active burst mode @ Vin=265Vac and step from

3A to 0.05A load

C1

C1





Figure 24

–

Output ripple at active burst mode @ Vin=85Vac and 0.25W load





Figure 25

–

Output ripple at active burst mode @ Vin=265Vac and 0.25W load



11.6 Vcc overvoltage protection (latch off mode)

C1 C1

C2

C3

C2

C3

C4 C4


DS

)


CC

)


FB

)


BL

)

System enters latch-off mode when V

CC

4.5V

>24V & V

FB

>


DS

)


CC

)


FB

)


BL

)


CC

4.5V

>24V & V

FB

>

Figure 26

– Vcc overvoltage protection @ Vin=85Vac; Rc1 disconnected at startup with light load.( C

BL

=100pF, remove ZD1)

Figure 27

–

Vcc overvoltage protection @ Vin=265Vac; Rc1 disconnected at startup with light load.(C

BL

=100pF, remove ZD1)


11.7 Overload mode)

C1

C2

C3


C1

C2

C3

C4

C4


DS

)


CC

)


FB

)


BL

)


DS

)


CC

)


FB

)


BL

)

Blanking time to enter auto-restart mode: 20ms;

System enters auto-restart when V

FB with basic mode blanking time.

>4.5V, V

BL

> 4V



FB with basic mode blanking time.

>4.5V, V

BL

> 4V

Figure 30

– Over load protection without extended blanking time; C

BL

=100pF @ Vin=85Vac and output power step from 0A to

4A load

Figure 31

–

Over load protection without extended blanking time; C

BL

=100pF @ Vin=265Vac and output power step from 0A to 4A load

C1

C1

C2 C2

C3 C3

C4 C4


DS

)


CC

)


FB

)


BL

)


DS

)


CC

)


FB

)


BL

)


System enters auto-restart when V with extended blanking time.

FB

>4.5V, V

BL

> 4V


System enters auto-restart when V with extended blanking time.

FB

>4.5V, V

BL

> 4V

Figure 30

load

– Over load protection with extended blanking time;

C

BL

= 10nF @ Vin=85Vac and output power step from 3A to 4A

Figure 31

–

Over load protection with extended blanking time;

C

BL

= 10nF @ Vin=265Vac and output power step from 3A to 4A load



11.8 Open loop protection (auto restart mode)

C1 C1

C2 C2

C3 C3

C4 C4


DS

)


CC

)


FB

)


BL

)


DS

)


CC

)


FB

)


BL

)

Blanking time to enter auto-restart mode : 20ms;


FB

>4.5V, V

BL

> 4V with defined blanking time.

Figure 32

– Open loop protection @ Vin=85Vac; Rc1 is disconnected during system operation @ 3A load(C

BL

=100pF)

Blanking time to enter auto-restart mode : 20ms;


FB

>4.5V, V

BL

> 4V with defined blanking time.

Figure 33

–

Open loop protection @ Vin=85Vac; Rc1 is disconnected during system operation @ 3A load(C

BL

=100pF)

11.9 Vcc under voltage/Short optocoupler protection (auto restart mode)

C1

C2

C3

C1

C2

C3

C4 C4


DS

)


CC

)


FB

)


BL

)


DS

)


CC

)


FB

)


BL

)

System enters auto-restart protection when Vcc <

10.5V

System enters auto-restart protection when Vcc <

10.5V

Figure 32

– Vcc overvoltage protection @ Vin=85Vac; Short optocoupler is done by shorting the transistor (primary side) of the optocoupler (C

BL

=100pF).

Figure 33

–

Vcc overvoltage protection @ Vin=265Vac; Short optocoupler is done by shorting the transistor (primary side) of the optocoupler (C

BL

=100pF).


11.10 External latch off enable

C1

C2


C1

C2

C3 C3

C4 C4


DS

)


CC

)


FB

)


BL

)


BL

< 0.1V

Figure 34

– Latch-off enable by triggering BL pin @ Vin=85Vac, short the BL pin to ground


DS

)


CC

)


FB

)


BL

)


BL

< 0.1V

Figure 35

–

Latch-off by triggering latch enable pin @

Vin=265Vac, short the BL pin to ground

11.11 Frequency Jittering


DS

) Channel 1; C1 : Drain to source voltage (V

DS

)

Frequency changing from 94.5kHz ~ 102.06KHz,

Jitter period is set at 4ms internally

Frequency changing from 93.5kHz ~ 101.5KHz, Jitter period is set at 4ms internally

Figure 36

–

Frequency change shown at

V and 15W load

DS

@ Vin=85Vac

Figure 37

–

Frequency change shown at V and 15W load

DS

@ Vin=265Vac


12 Appendix


12.1 Slope compensation for CCM operation

This demo board is designed in Discontinuous Conduction Mode (DCM) operation. If the application is designed in Continuous Conduction Mode (CCM) operation where the maximum duty cycle exceeds the 50% threshold, it needs to add the slope compensation network. Otherwise, the circuitry will be unstable. In that case, three extra components (2 ceramic capacitors C17 & C18 and one resistor R19) are needed to add as shown in the circuit diagram below (red block).

Figure 38

– Circuit Diagram Switch Mode Power Supply with Slope Compensation

More information regarding how to calculate the additional components, see in the application note

AN_SMPS_ICE2xXXX – available on the internet: www.infineon.com/CoolSET CoolSET F2.

13 References

[1] Infineon Technologies, Datasheet “CoolSET

®

Controller with Integrated 650V CoolMOS

®

-F3 ICE3A1065ELJ Off-Line SMPS Current Mode

and Startup Cell ( Latch and Frequency Jitter Mode )”

[2] Kyaw Zin Min, Eric Kok Siu Kam, Infineon Technologies, Application Note “ICE3Axx65ELJ CoolSET

F3 latch & Jitter version Design Guide, AN-PS0030“

®

[3] Harald Zoellinger, Rainer Kling, Infineon Technologies, Application Note “AN-SMPS-ICE2xXXX-1,

CoolSET

®

ICE2xXXXX for Off-Line Switching Mode Power supply (SMPS )”


15W 5V Evaluation board using ICE3A1065ELJ

®

15W 5V Demoboard using ICE3A1065ELJ on board

15W 5V Demoboard using ICE3A1065ELJ

1 Abstract

15W 5V Demoboard using ICE3A1065ELJ

3 List of Features

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

6.1 Component side component legend

6.2 Solder side copper & component legend

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

7.1 Introduction

7.3 Start up & auxiliary supply circuit

7.4 RCD Clamper circuit

7.5 Peak primary current control circuit

7.6 Output Stage of secondary side

15W 5V Demoboard using ICE3A1065ELJ

7.7 Feedback and regulation

Blanking Window for Load Jump & Active Burst Mode

Active Burst Mode

Frequency jitter mode

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

9 Transformer Construction

15W 5V Demoboard using ICE3A1065ELJ

10.1 Efficiency

Efficiency versus AC Line Input Voltage

Efficiency versus Output Power

10.2 Input Standby Power

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

10.5 Max. Overload Output Power

15W 5V Demoboard using ICE3A1065ELJ

10.6 Electrostatic Discharge Test (ESD)

10.7 Lightning Surge Test

10.8 Conducted EMI Test

15W 5V Demoboard using ICE3A1065ELJ

f / MHz

15W 5V Demoboard using ICE3A1065ELJ

11 Waveforms and scope plots

11.1 Startup @ low and high AC line input voltage and 15W load

15W 5V Demoboard using ICE3A1065ELJ

11.2 Drain to source voltage and current during 15W load operation

11.3 Load transient response (Load jump from 10% to 100%)

11.4 AC output ripple during 15W

15W 5V Demoboard using ICE3A1065ELJ

11.5 Active Burst Mode @ light load

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

11.6 Vcc overvoltage protection (latch off mode)

11.7 Overload mode)

15W 5V Demoboard using ICE3A1065ELJ

15W 5V Demoboard using ICE3A1065ELJ

11.8 Open loop protection (auto restart mode)

Figure 32

Figure 33

11.9 Vcc under voltage/Short optocoupler protection (auto restart mode)

11.10 External latch off enable

15W 5V Demoboard using ICE3A1065ELJ

11.11 Frequency Jittering

12 Appendix

15W 5V Demoboard using ICE3A1065ELJ

12.1 Slope compensation for CCM operation

13 References

Related manuals

Infineon

ICE3A1065ELJFKLA1

Table of contents