Data Sheet ICL8002G

LED Controller IC
Single Stage PFC and Flyback LED Controller
ICL8002G
Data Sheet
Rev1.0, 2012-02-28
Industrial and Multimarket
Edition 2012-02-28
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2012 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties
and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights
of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the 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 the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only 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.
Single Stage PFC and Flyback LED Controller
ICL8002G
Revision History
Page or Item
Subjects (major changes since previous revision)
Rev1.0,2012-02-28
<Revision X.Y>, <yyyy-mm-dd>
Trademarks of Infineon Technologies AG
AURIX™, BlueMoon™, C166™, CanPAK™, CIPOS™, CIPURSE™, COMNEON™, EconoPACK™, CoolMOS™,
CoolSET™, CORECONTROL™, CROSSAVE™, DAVE™, EasyPIM™, EconoBRIDGE™, EconoDUAL™,
EconoPIM™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™, ISOFACE™, IsoPACK™,
MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OmniTune™, OptiMOS™, ORIGA™, PRIMARION™,
PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™, SIEGET™,
SINDRION™, SIPMOS™, SMARTi™, SmartLEWIS™, SOLID FLASH™, TEMPFET™, thinQ!™,
TRENCHSTOP™, TriCore™, X-GOLD™, X-PMU™, XMM™, XPOSYS™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR
development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™,
FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG.
FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of
Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™ of Infrared Data
Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of
MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics
Corporation. Mifare™ of NXP. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™
of MURATA MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc.,
OmniVision™ of OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc.
RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc.
SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden
Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA.
UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™
of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of
Diodes Zetex Limited.
Last Trademarks Update 2010-10-26
Data Sheet
3
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Table of Contents
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1
Single Stage PFC and Flyback LED Controller
Product Highlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
2.1
2.2
2.3
Pin Configuration and Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pin Configuration with PG-DSO-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package PG-DSO-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pin Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Representative Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4
4.1
4.2
4.3
4.3.1
4.3.2
4.3.2.1
4.3.3
4.4
4.4.1
4.4.2
4.5
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC Pre-Charging and Typical VCC Voltage During Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zero Crossing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ringing Suppression Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch on Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch Off Determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foldback Point Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Features in ICL8002G compare to ICL8001G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iProtection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
13
13
13
14
14
14
15
15
16
17
5
5.1
5.2
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
5.3.9
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWM Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soft Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foldback Point Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Zero Crossing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gate Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
18
18
19
19
19
20
20
20
21
21
22
22
6
Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Data Sheet
4
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Single Stage PFC and Flyback LED Controller Product Highlight
1
•
•
•
•
•
Single Stage PFC and Flyback LED Controller
Product Highlight
Quasi-Resonant Control For Highly Efficient LED Driving Solutions
Primary Side Flyback Control With Integrated PFC And Phase-Cut Dimming
Integrated HV Startup Cell For Short Time To Light
Best In Class System BOM For Dimmable LED Bulb
Continous Dimming curve for better diiming behaviour
Features
•
•
•
•
•
•
•
•
•
•
•
High, stable efficiency over wide operating range
Optimized for trailing- and leading-edge dimmer
Precise PWM for primary PFC and dimming control
Power cell for Vcc pre-charging with constant current
Built-in digital soft-start
Foldback correction and cycle-by-cycle peak current limitation
VCC over/ under-voltage lockout
Auto restart mode for short circuit protection
Adjustable latch-off mode for output overvoltage protection
Minimize the light shimmering effect for better dimming behaviour.
Enabling the input current shaping for higher PF and lower THD.
Description
The ICL8002G employs quasi-resonant operation mode optimized for off-line LED lighting, especially dimmable
LED bulbs for incandescent lamp replacement.
Precise PWM generation enables primary control for phase cut dimming and high power factor PF>98%.
Significant improved driver efficiency, up to 90%, compared to other conventional solutions. Tthe product has a
wide operation range (up to 26 V) of IC voltage supply and lower power consumption. Multiple safety functions
ensure a full system protection in failure situations.
With its full feature set and simple application, the ICL8002G represents an outstanding choice for quasi-resonant
flyback LED bulb designs combining feature set and performance at minimum BOM cost.
Data Sheet
7
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Single Stage PFC and Flyback LED Controller Product Highlight
Application Circuit for Primary Control
Figure 1
Application Circuit
Type
Package
ICL8002G
PG-DSO-8
Data Sheet
8
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Pin Configuration and Functionality
2
Pin Configuration and Functionality
2.1
Pin Configuration with PG-DSO-8
Table 1
Pin Description
Ball No.
Name
Pin
Type
Buffer
Type
Function
1
ZCV
–
–
Zero Crossing
2
VR
–
–
Voltage Sense
3
CS
–
–
Current Sense
4
GD
–
–
Gate Drive Output
5
HV
–
–
High Voltage Input
6
n.c.
–
–
Not connected
7
VCC
–
–
Controller Supply Voltage
8
GND
GND
–
Controller Ground
2.2
Package PG-DSO-8
ZCV
1
8
GND
VR
2
7
VCC
CS
3
6
NC
GD
4
5
HV
PG _DSO_8_Top .vsd
Figure 2
Data Sheet
Pin Configuration PG-DSO-8(top view)
9
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Pin Configuration and Functionality
2.3
Pin Functionality
ZCV (Zero Crossing)
At this pin, the voltage from the auxiliary winding after a time delay circuit is applied. Internally, this pin is connected
to the zero-crossing detector for switch-on determination. Additionally, the output overvoltage detection is realized
by comparing the voltage Vzc with an internal preset threshold.
VR (Voltage Sense)
The rectified input mains voltage is sensed at this pin. The signal is used to set the peak current of the peak-current
control and therefore allow for the PFC and phase-cut dimming functionality.
CS (Current Sense)
This pin is connected to the shunt resistor for the primary current sensing, externally, and the PWM signal
generator for switch-off determination (together with the feedback voltage), internally. Moreover, short-winding
protection is realised by monitoring the voltage Vcs during on-time of the main power switch.
GD (Gate Drive Output)
This output signal drives the external main power switch, which is a power MOSFET in most case.
HV (High Voltage)
The pin HV is connected to the bus voltage, externally, and to the power cell, internally. The current through this
pin pre-charges the VCC capacitor with constant current once the supply bus voltage is applied.
VCC (Power supply)
VCC pin is the positive supply of the IC. The operating range is between VVCCoff and VVCCOVP.
GND (Ground)
This is the common ground of the controller.
Data Sheet
10
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Representative Block Diagram
3
Representative Block Diagram
VCC
Zero Crossing
ZCV
Zero
Current
Detection
Over
Voltage
Protection
HV
Power Managment
Over / UnderVoltage Lockout
Startup Cell
Voltage
Reference
& Biasing
Protection
Restart /
Latchup
Control
OTP
Foldback
Correction
Depl. CoolMOS®
GND
Gate Drive
Gate
Control
GD
Leading
Edge
Blanking
CS
Short
Winding
Detection
Current Mode Control
Softstart
VR
PWM
Comparator
&
PFC/
Dimming
Control
BlockDiagram .vsd
Figure 3
Data Sheet
Representative Block Diagram
11
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
4
Functional Description
4.1
VCC Pre-Charging and Typical VCC Voltage During Start-up
In ICL8002G, a high voltage startup cell is integrated. As shown in Figure 2, the start cell consists of a high voltage
device and a controller, whereby the high voltage device is controlled by the controller. The startup cell provides
a pre-charging of the VCC capacitor till VCC voltage reaches the VCC turned-on threshold VVCCon and the IC
begins to operate.
Once the mains input voltage is applied, a rectified voltage shows across the capacitor Cbus. The high voltage
device provides a current to charge the VCC capacitor Cvcc. Before the VCC voltage reaches a certain value, the
amplitude of the current through the high voltage device is only determined by its channel resistance and can be
as high as several mA. After the VCC voltage is high enough, the controller controls the high voltage device so
that a constant current around 1mA is provided to charge the VCC capacitor further, until the VCC voltage exceeds
the turned-on threshold VVCCon. As shown as the time phase I in Figure 3, the VCC voltage increase near linearly
and the charging speed is independent of the mains voltage level.
VVCC
V VCCon
i
ii
iii
VVCCoff
t1
Figure 4
t2
t
VCC voltage at start up
The time taking for the VCC pre-charging can then be approximately calculated as:
VVCCon ⋅ CVCC
t1 =
I VCCch arg e 2
(1)
where IVCCcharge2 is the charging current from the startup cell which is 1.05mA, typically.
Exceeds the VCC voltage the turned-on threshold VVCCon of at time t1, the startup cell is switched off, and the IC
begins to operate with a soft-start. Due to power consumption of the IC and the fact that still no energy from the
auxiliary winding to charge the VCC capacitor before the output voltage is built up, the VCC voltage drops (Phase
II). Once the output voltage is high enough, the VCC capacitor receives then energy from the auxiliary winding
from the time point t2 on. The VCC then will reach a constant value depending on output load.
Data Sheet
12
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
4.2
Soft-start
At the time ton, the IC begins to operate with a soft-start. By this soft-start the switching stresses for the switch,
diode and transformer are minimised. The soft-start implemented in ICL8002G is a digital time-based function. The
preset soft-start time is 12ms with 4 steps. If not limited by other functions, the peak voltage on CS pin will increase
step by step from 0.32 V to 1 V finally.
Vcs_sst
(V)
1.00
0.83
0.66
0.49
0.32
ton
3
6
Figure 5
Maximum current sense voltage during softstart
4.3
Normal Operation
9
12
Time(ms)
The PWM controller during normal operation consists of a digital signal processing circuit including a comparator,
and an analog circuit including a current measurement unit and a comparator. The switch-on and -off time points
are each determined by the digital circuit and the analog circuit, respectively. As input information for the switchon determination, the zero-crossing input signal is needed, while the voltages sense signal at pin VR and the
current sensing signal VCS are necessary for the switch-off determination. Details about the full operation of the
PWM controller in normal operation are illustrated in the following paragraphs.
4.3.1
Zero Crossing
In the system, the voltage from the auxiliary winding is applied to the zero-crossing pin through a RC network,
which provides a time delay to the voltage from the auxiliary winding. Internally, this pin is connected to a clamping
network, a zero-crossing detector, an output overvoltage detector and a ringing suppression time controller.
During on-state of the power switch a negative voltage applies to the ZCV pin. Through the internal clamping
network, the voltage at the pin is clamped to -0.3V.
The voltage VZC is also used for the output overvoltage protection. Once the voltage at this pin is higher than the
threshold VZCOVP during off-time of the main switch, the IC is latched off after a fixed blanking time.
To achieve the switch-on at voltage valley, the voltage from the auxiliary winding is fed to a time delay network
(the RC network consists of Dzc, Rzc1, Rzc2 and Czc as shown in typical application circuit) before it is applied
to the zero-crossing detector through the ZC pin. The needed time delay to the main oscillation signal Dt should
be approximately one fourth of the oscillation period (by transformer primary inductor and drain-source capacitor)
Data Sheet
13
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
minus the propagation delay from thedetected zero-crossing to the switch-on of the main switch tdelay,
theoretically:
Δt =
TOSC
− t delay
4
(2)
This time delay should be matched by adjusting the time constant of the RC network which is calculated as:
τ td = C ZC ⋅
4.3.2
R ZC 1 ⋅ R ZC 2
R ZC 1 + R ZC 2
(3)
Ringing Suppression Time
After MOSFET is turned off, there will be some oscillation on VDS, which will also appear on the voltage on ZC
pin. To avoid that the MOSFET is turned on mistriggerred by such oscillations, a ringing suppression timer is
implemented. The timer is dependent on the voltage VZC. When the voltage VZC is lower than the threshold VZCRS,
a longer preset time applies, while a shorter time is set when the voltage VZC is higher than the threshold.
4.3.2.1
Switch on Determination
After the gate drive goes to low, it can not be changed to high during ring suppression time.
After ring suppression time, the gate drive can be turned on when the zero crossing is detected.
However, it is also possible that the oscillation between primary inductor and drain-source capacitor damps very
fast and IC can not detect a zero crossing. In this case, a maximum off time is implemented. After gate drive has
been remained off for the period of tOffMax, the gate drive will be turned on again regardless. This function can
effectively prevent the switching frequency from going lower than 20kHz, otherwise which will cause audible noise,
during start up.
4.3.3
Switch Off Determination
In the converter system, the primary current is sensed by an external shunt resistor, which is connected between
low-side terminal of the main power switch and the common ground. The sensed voltage across the shunt resistor
VCS is applied to an internal current measurement unit, and its output voltage V1 is compared with the voltage at
pin VR. Once the voltage V1 exceeds the voltage VVR, the output flip-flop is reset. As a result, the main power
switch is switched off. The relationship between the V1 and the VCS is described by:
V1 = 3.3 ⋅ VCS + 0.7
(4)
To avoid mistriggering caused by the voltage spike across the shunt resistor at the turn on of the main power
switch, a leading edge blanking time, tLEB, is applied to the output of the comparator. In other words, once the gate
drive is turned on, the minimum on time of the gate drive is the leading edge blanking time.
In addition, there is a maximum on time, tOnMax, limitation implemented in the IC. Once the gate drive has been in
high state longer than the maximum on time, it will be turned off to prevent the switching frequency from going too
low because of long on time.
Data Sheet
14
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
4.4
Current Limitation
There is a cycle by cycle current limitation realized by the current limit comparator to provide an overcurrent
detection. The source current of the MOSFET is sensed via a sense resistor RCS. By means of RCS the source
current is transformed to a sense voltage VCS which is fed into the pin CS. If the voltage VCS exceeds an internal
voltage limit, adjusted according to the Mains voltage, the comparator immediately turns off the gate drive.
To prevent the Current Limitation process from distortions caused by leading edge spikes, a Leading Edge
Blanking time (tLEB) is integrated in the current sensing path.
A further comparator is implemented to detect dangerous current levels (VCSSW) which could occur if one or more
transformer windings are shorted or if the secondary diode is shorted. To avoid an accidental latch off, a spike
blanking time of tCSSW is integrated in the output path of the comparator.
4.4.1
Foldback Point Correction
When the main bus voltage increases, the switch on time becomes shorter and therefore the operating frequency
is also increased. As a result, for a constant primary current limit, the maximum possible output power is increased,
which the converter may have not been designed to support.
To avoid such a situation, the internal foldback point correction circuit varies the VCS voltage limit according to the
bus voltage. This means the VCS will be decreased when the bus voltage increases. To keep a constant maximum
input power of the converter, the required maximum VCS versus various input bus voltage can be calculated, which
is shown in Figure 6.
1
Vcs-max(V)
0.9
0.8
0.7
0.6
80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400
Vin(V)
Figure 6
Data Sheet
Variation of the VCS limit voltage according to the IZC current
15
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
According to the typical application circuit, when MOSFET is turned on, a negative voltage proportional to bus
voltage will be coupled to auxiliary winding. Inside ICL8002G, an internal circuit will clamp the voltage on ZC pin
to nearly 0 V. As a result, the current flowing out from ZC pin can be calculated as
I ZC =
V BUS N
R ZC 1 N
a
P
(5)
When this current is higher than IZC_1, the amount of current exceeding this threshold is used to generate an
offset to decrease the maximum limit on VCS. Since the ideal curve shown in Figure 6 is a nonlinear one, a digital
block in ICL8002G is implemented to get a better control of maximum output power. Additional advantage to use
digital circuit is the production tolerance is smaller compared to analog solutions. The typical maximum limit on
VCS versus the ZC current is shown in Figure 7.
1
Vcs-max(V)
0.9
0.8
0.7
0.6
300
500
700
900
1100
1300
1500
1700
1900
2100
Izc(uA)
Figure 7
VCS-max versus IZCi
4.4.2
Additonal Features in ICL8002G compare to ICL8001G
1) New Valley Switching Sheme which minimizes light shimmer effect.
2) Helps for the continous dimming curve for smooth dimming.
3) Internal hold-up resistor value has been increased for better shaping of the input current.
4) Better shaping of the input current results in high PFC and stable dimming at higher LED current precision.
5) Better PFC leads to lower THD operation to meet the EN standards for hormonics.
Data Sheet
16
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
4.5
iProtection Functions
The IC provides full protection functions. The following table summarizes these protection functions.
Table 2
Protection features
VCC Overvoltage
Auto Restart Mode
VCC Undervoltage
Auto Restart Mode
Over temperature
Auto Restart Mode
Output Overvoltage
Latched Off Mode
Short Winding
Latched Off Mode
During operation, the VCC voltage is continuously monitored. In case of an under- or an over-voltage, the IC is
reset and the main power switch is then kept off. After the VCC voltage falls below the threshold VVCCoff, the
startup cell is activated. The VCC capacitor is then charged up. Once the voltage exceeds the threshold VVCCon,
the IC begins to operate with a new soft-start.
During off-time of the power switch, the voltage at the zero-crossing pin is monitored for output over-voltage
detection. If the voltage is higher than the preset threshold VZCOVP, the IC is latched off after the preset blanking
time.
There is also the overvoltage protection being implemented at VR, when this voltage exceeds VVROVP, the device
goes into Auto Restart Mode.
If the junction temperature of IC exceeds 140 0C, the IC enter into autorestart mode.
If the voltage at the current sensing pin is higher than the preset threshold VCSSW during on-time of the power
switch, the IC is latched off. This is short-winding protection.
During latch-off protection mode, when the VCC voltage drops to 10.5 V,the startup cell is activated and the VCC
voltage is charged to 18 V then the startup cell is shut down again and repeats the previous procedure.
There is also a maximum on time limitation inside ICL8002G. Once the gate voltage is high longer than tOnMAx, it
is turned off immediately.
Data Sheet
17
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Electrical Characteristics
5
Electrical Characteristics
Note: All voltages are measured with respect to ground (Pin 8). The voltage levels are valid if other ratings are not
violated.
5.1
Absolute Maximum Ratings
Note: Absolute maximum ratings are defined as ratings, which when being exceeded may lead to destruction of
the integrated circuit. For the same reason make sure, that any capacitor that will be connected to pin 7 (VCC)
is discharged before assembling the application circuit.
Table 3
Absolute Maximum Ratings
Parameter
Symbol
Values
Min.
Max.
Unit
Note / Test Condition
HV Voltage
VHV
–
500
V
VCC Supply Voltage
VVCC
-0.3
27
V
VR Voltage
VVR
-0.3
5.0
V
ZCV Voltage
VZC
-0.3
5.0
V
CS Voltage
VCS
-0.3
5.0
V
GD Voltage
VOUT
-0.3
27
V
Maximum current out from ZC pin
IZCMAX
3
–
mA
Junction Temperature
TJ
-40
150
°C
Storage Temperature
TS
-55
150
°C
Thermal Resistance Junction - Ambient RthJA
–
185
K/W
PG-DSO-8
ESD Capability (incl. Drain Pin)
–
2
kV
Human body model1)
VESD
1) According to EIA/JESD22-A114-B (discharging a 100pF capacitor through a 1.5 kOhm series resistor).
5.2
Operating Range
Note: Within the operating range the IC operates as described in the functional description.
Table 4
Operating Range
Parameter
Symbol
Values
Min.
Typ.
Unit
Max.
VCC Supply Voltage
VVCC
VVCCoff –
VVCCOP V
Junction Temperature of Controller
TjCON
-25
130
Data Sheet
18
–
Note / Test Condition
°C
TjCON<TJ , Limited by over
temperature protection
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Electrical Characteristics
5.3
Characteristics
5.3.1
Supply Section
Note: The electrical characteristics involve the spread of values within the specified supply voltage and junction
temperature range TJ from – 25 °C to 130 °C. Typical values represent the median values, which are related
to 25°C. If not otherwise stated, a supply voltage of VCC = 18 V is assumed.
Table 5
Supply Section
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note / Test Condition
Start Up Current
IVCCstart
–
300
550
µA
VVCC= VVCCon-0.2 V
VCC Charge Current
IVCCcharge1
–
5.0
–
mA
VVCC= 0 V
IVCCcharge2
0.8
–
mA
VVCC= 1 V
IVCCcharge3
–
1.0
–
mA
VVCC= VVCCon-0.2 V
Maximum Input Current ofStartup Cell IDrainIn
and CoolMOS®
–
–
2
mA
VVCC= VVCCon-0.2 V
Leakage Current ofStartup Cell
IStartLeak
–
0.2
50
µA
VHV = 610 V at Tj= 100°C
Supply Current in normal operation
IVCCNM
–
1.5
2.3
mA
VVR= 0 V and no switching
Supply Current in Auto Restart Mode IVCCAR
with Inactive Gate
–
300
–
µA
IVR = 0 A
Supply Current in Latch-off Mode
IVCClatch
–
300
–
µA
VCC Turn-On Threshold
VVCCon
17.0
18.0
19.0
V
VCC Turn-Off Threshold
VVCCoff
9.8
10.5
11.2
V
VCC Turn-On/Off Hysteresis
VVCChys
–
7.5
–
V
5.3.2
Internal Voltage Reference
Table 6
Internal Voltage Reference
Parameter
Internal Reference Voltage
Data Sheet
Symbol
VREF
Values
Min.
Typ.
Max.
4.80
5.00
5.20
19
Unit
Note / Test Condition
V
Measured at pin VR IVR = 0
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Electrical Characteristics
5.3.3
PWM Section
Table 7
PWM Section
Parameter
Symbol
Values
Unit
Min.
Typ.
Max.
VR Refrence Pull-Up Resistor
RVR
76
100
150
kΩ
PWM-OP Gain
GPWM
3.23
3.3
3.33
–
Offset for Voltage Ramp
VPWM
0.636
0.7
0.786
V
22
30
41
µs
Maximum on time in normal operation tOnMax
5.3.4
Current Sense
Table 8
Current Sense
Parameter
Symbol
Values
Unit
Min.
Typ.
Max.
Peak current limitation in normal
operation
VCSth
0.97
1.03
1.09
V
Leading Edge Blanking time
tLEB
200
330
460
ns
5.3.5
Soft Start
Table 9
Soft Start
Parameter
Soft-Start time
Symbol
Values
Unit
Min.
Typ.
Max.
8.5
12
–
ms
1)
–
3
–
ms
Internal regulation voltage
at first step
VCSth
1)
–
1.76
–
V
Internal regulation voltage
step at soft start
VCSth1)
–
0.56
–
V
Soft-start time step
tSS
tSS_S
Note / Test Condition
Note / Test Condition
Note / Test Condition
1) The parameter is not subjected to production test - verified by design/characterization
Data Sheet
20
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Electrical Characteristics
5.3.6
Foldback Point Correction
Table 10
Foldback Point Correction
Parameter
Symbol
Values
Unit
Min.
Typ.
Max.
Note / Test Condition
ZCV current first step threshold
IZC_FS
0.35
0.5
0.621
mA
ZCV current last step threshold
IZC_LS
1.3
1.7
2.2
mA
CS threshold minimum
VCSMF
–
0.66
–
V
IZC = 2.2 mA, VVR = 3.8 V
Unit
Note / Test Condition
5.3.7
Table 11
Zero Crossing
Zero Crossing
Parameter
Symbol
Values
Min.
Typ.
Max.
Zero crossing threshold voltage
VZCCT
50
100
170
mV
Ringing suppression threshold
VZCRS
–
0.7
–
V
Minimum ringing suppression time
tZCRS1
1.62
2.5
4.5
µs
VZC > VZCRS
Maximum ringing suppression time
tZCRS2
–
25
–
µs
VZC < VZCRS
Maximum restart time in normal
operation
tOffMax
30
42
57.5
µs
Data Sheet
21
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Electrical Characteristics
5.3.8
Protection
Table 12
Protection
Parameter
Symbol
Values
Unit
Min.
Typ.
Max.
VCC overvoltage threshold
VVCCOVP
24.0
25.0
26.0
V
Output Overvoltage detection
threshold at the ZCV pin
VZCOVP
3.55
3.7
3.84
V
Overvoltage protection threshold at
the VR pin
VVROVP
Overvoltage protection threshold
Blanking time at VR pin
tOVP_B
4.5
V
20
30
44
ms
Blanking time for Output Overvoltage tZCOVP
protection
–
100
–
µs
Threshold for short winding protection VCSSW
1.63
1.68
1.78
V
Blanking time for short-windding
protection
tCSSW
–
190
–
ns
TjCon
130
140
150
°C
Over temperature protection1)
Note / Test Condition
1) The parameter is not subjected to production test - verified by design/characterization
Note: The trend of all the voltage levels in the Control Unit is the same regarding the deviation except VVCCOVP
5.3.9
Gate Drive
Table 13
Gate Drive
Parameter
Symbol
Values
Min.
Typ.
Max.
Unit
Note / Test Condition
Output voltage at logic low
VGATElow
–
–
1.0
V
VVCC = 18 V
IOUT = 10 mA
Output voltage at logic high
VGATEhigh
9.0
10.0
–
V
VVCC = 18 V
IOUT = -10 mA
Output voltage active shut down
VGATEasd
–
–
1.0
V
VVCC = 7 V
IOUT = 10 mA
Rise Time
trise
–
117
–
ns
COUT = 1.0 nF
VGATE = 2 V ... 8 V
Fall Time
tfall
–
27
–
ns
COUT = 1.0 nF
VGATE = 8 V ... 2 V
Data Sheet
22
Rev1.0, 2012-02-28
Single Stage PFC and Flyback LED Controller
ICL8002G
Outline Dimension
6
Outline Dimension
Figure 8
PG-DSO-8 (Pb-free lead plating Plastic Dual Small Outline)
Dimensions in mm.
Data Sheet
23
Rev1.0, 2012-02-28
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
Download PDF