NXP TEA1720B3T HV start-up flyback controller User Guide

UM10886
TEA1720ADB1180 10 W EPC17 demo board
Rev. 1 — 2 March 2015
User manual
Document information
Info
Content
Keywords
TEA1720ADB1180, TEA1720B3T, TEA1705, ultra-low standby power,
constant output voltage, constant output current, primary sensing,
integrated high-voltage start-up, smartphone and tablet charger, 5 V/2.0 A
supply, SMPS transient controller
Abstract
This user manual describes the TEA1720ADB1180 10 W Constant
Voltage/Constant Current (CV/CC) universal input power supply for tablet
adapters/chargers. This demo board is based on the GreenChip Smart
Power TEA1720B3T and the TEA1705 transient controller. The
TEA1720B3T and TEA1705 application enables a no-load power
consumption of less than 20 mW and a low external component count for
cost-effective applications. In addition, the TEA1720B3T provides
advanced control modes for optimal performance. The TEA1705 transient
controller continuously monitors the output voltage. When the output
voltage drops below the detection level Vdet (VCC), a transient interrupt
signal is generated to wake up the TEA1720B3T.
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Revision history
Rev
Date
Description
v.1
20150302
first issue
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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1. Introduction
WARNING
Lethal voltage and fire ignition hazard
The non-insulated high voltages that are present when operating this product, constitute a
risk of electric shock, personal injury, death and/or ignition of fire.
This product is intended for evaluation purposes only. It shall be operated in a designated test
area by personnel qualified according to local requirements and labor laws to work with
non-insulated mains voltages and high-voltage circuits. This product shall never be operated
unattended.
This user manual describes the TEA1720ADB1180 10 W Constant Voltage or Constant
Current (CV/CC) universal input power supply for tablet adapters and chargers. This
demo board is based on the TEA1720B3T GreenChip SP-integrated circuit.
The TEA1720B3T GreenChip SP provides ultra-low no-load power consumption without
using additional external components. Designs are cost-effective using the TEA1720B3T
GreenChip SP because only a few external components are needed in a typical
application.
The additional TEA1705 transient controller ensures excellent transient response in
no-load mode.
Remark: All voltages are in V (AC) unless otherwise stated
2. Safety warning
The complete demo board application is AC mains voltage powered. Avoid touching the
board when power is applied. An isolated housing is obligatory when used in uncontrolled,
non-laboratory environments. Always provide galvanic isolation of the mains phase using
a variable transformer. The following symbols identify isolated and non-isolated devices.
019aab174
019aab173
a. Isolated
Fig 1.
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b. Not Isolated
Isolation symbols
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3. Features
3.1 Power features
•
•
•
•
•
Low component count for cost-effective design
•
•
•
•
•
Built-in emitter switch for driving low-cost NPN high-voltage transistor
Universal mains input
Isolated output
Highly efficient > 80 %
Primary sensing for control of the output voltage without optocoupler and secondary
feedback circuitry
Minimizes audible noise in all operation modes
Energy Star 2.0 compliant
Jitter function for reduced EMI
Excellent transient performance with ultra low no-load power and small output
capacitors
• Cable compensation 0.3 V at maximum power
3.2 Green features
• No-load power consumption < 20 mW
• Very low supply current in no-load condition with energy save mode
• Incorporates a high-voltage start-up circuit with zero current consumption under
normal switching operation
3.3 Protection features
•
•
•
•
•
•
•
•
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OverVoltage Protection (OVP) with auto-restart
UnderVoltage LockOut (UVLO) and OverVoltage Protection (OVP) on IC supply pin
OverTemperature Protection (OTP)
Sense pin short protection
Hiccup function for automatic switch-off at continuous too low output voltage
Demagnetization protection for guaranteed discontinuous conduction mode operation
Open and short-circuit protection of the Feedback control (FB) pin
Short-circuit protection of the charger output
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4. Technical specifications
Table 1.
Input specifications
Parameter
Conditions Value
Remark
input voltage
-
90 V to 265 V
universal AC mains
input frequency
-
47 Hz to 63 Hz -
average no-load input power
consumption
no-load
17.5 mW
Table 2.
average of 115 V and 230 V
Output specifications
Parameter
Conditions Value
Remark
output voltage
-
5.0 V
-
nominal output current
-
2.0 A
-
nominal output power
-
10.0 W
-
5. Board photographs
a. Top view
Fig 2.
b. Bottom view
TEA1720ADB1180 10 W EVD15 demo board
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6. Performance data
6.1 No-load input power consumption
The no-load input power has been measured 20 minutes after switch-on. Table 3 and
Figure 3 show the results.
Table 3.
No-load input power consumption
Vmains (V)
Output voltage (V)
Power consumption (mW)
90
5.183
18.1
115
5.18
17.5
230
5.164
17.4
265
5.158
18.2
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P:
Fig 3.
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9PDLQV 9
No-load input power consumption
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6.2 VI curves
Figure 4 shows the VI characteristics measured at the PCB end.
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a. 90 V (AC)
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b. 115 V (AC)
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c. 230 V (AC)
Fig 4.
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d. 265 V (AC)
VI characteristics (PCB end)
Below Vout = 2.7 V at the PCB end, the controller enters the hiccup mode.
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Figure 5 shows the VI characteristics measured at the cable end.
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a. 90 V (AC)
,RXW $
b. 115 V (AC)
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c. 230 V (AC)
Fig 5.
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d. 265 V (AC)
VI characteristics (cable end)
Below Vout = 2.4 V at the cable end the controller enters the hiccup mode.
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6.3 Efficiency
Figure 6 shows the efficiency at 90 V, 115 V, 230 V and 265 V.
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(1) Efficiency at 90 V (AC)
(2) Efficiency at 115 V (AC)
(3) Efficiency at 230 V (AC)
(4) Efficiency at 265 V (AC)
Fig 6.
Table 4.
Efficiency as a function of output current at the PCB end
Efficiency PCB end
Vin (V (AC))
Iout (A)
Vout (V)
Pin (W)
efficiency (%)
Average 0.5 A to 2.0 A
90
0.200
5.012
1.361
73.534
77.753
0.499
5.040
3.258
77.224
0.999
5.108
6.557
77.806
1.500
5.192
9.990
77.951
2.000
5.292
13.561
78.029
0.200
5.009
1.342
74.463
0.499
5.035
3.199
78.561
0.999
5.105
6.435
79.219
1.500
5.187
9.783
79.504
1.999
5.284
13.242
79.774
0.200
5.014
1.346
74.366
0.499
5.043
3.167
79.497
0.999
5.109
6.308
80.895
1.500
5.193
9.581
81.285
2.000
5.283
12.953
81.551
115
230
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79.265
80.807
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Table 4.
Efficiency PCB end …continued
Vin (V (AC))
Iout (A)
Vout (V)
Pin (W)
efficiency (%)
Average 0.5 A to 2.0 A
265
0.200
5.020
1.368
73.260
80.646
0.499
5.044
3.185
79.068
0.999
5.111
6.317
80.814
1.500
5.195
9.594
81.207
2.000
5.286
12.969
81.494
6.4 Transient response TEA1720B3T
The transient response for the TEA1720B3T (300 mV cable compensation) has been
tested with load steps at 90 V and 265 V at the PCB end and at the end of the cable from:
• 0 A  0.5 A  0 A
• 0 A  1.0 A  0 A
• 0 A  2.0 A  0 A
Figure 7 to Figure 9 show the load step response, measured at PCB end.
Red = Vout
Red = Vout
Orange = Iout
Orange = Iout
a. 90 V (AC)
Fig 7.
b. 265 V (AC)
Load step 0 A  0.5 A  0 A at PCB end
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Red = Vout
Red = Vout
Orange = Iout
Orange = Iout
a. 90 V (AC)
Fig 8.
b. 265 V (AC)
Load step 0 A  1.0 A  0 A at PCB end
Red = Vout
Red = Vout
Orange = Iout
Orange = Iout
a. 90 V (AC)
Fig 9.
b. 265 V (AC)
Load step 0 A  2.0 A  0 A at PCB end
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Figure 10 to Figure 12 show the load step response measured at cable end (0.15 ).
Red = Vout
Red = Vout
Orange = Iout
Orange = Iout
a. 90 V (AC)
b. 265 V (AC)
Fig 10. Load step 0 A  0.5 A  0 A at cable end (0.15 )
Red = Vout
Red = Vout
Orange = Iout
Orange = Iout
a. 90 V (AC)
b. 265 V (AC)
Fig 11. Load step 0 A  1.0 A  0 A at cable end (0.15 )
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Red = Vout
Red = Vout
Orange = Iout
Orange = Iout
a. 90 V (AC)
b. 265 V (AC)
Fig 12. Load step 0 A  2.0 A  0 A at cable end (0.15 )
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6.5 Turn-on delay and output rise time
Figure 13 shows the turn-on the delay of the output of the supply at 90 V and 265 V with
no-load and 2 A load.
Turn-on delay time = 106 ms
Turn-on delay time = 104 ms
a. 90 V (AC); no-load
b. 265 V (AC); no-load
Turn-on delay time = 123 ms
Turn-on delay time = 123 ms
c. 90 V (AC); 2 A load
d. 265 V (AC); 2 A load
Fig 13. Turn-on delay times at no-load and 2 A load
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Figure 14 shows the rise time of the output from 10 % to 90 % at 90 V and 265 V with
no-load and 2 A load.
(1) Rise time: 10 % => 90 % = 1.74 ms
(1) Rise time: 10 % => 90 % = 1.71 ms
(2) Rise time: 0 % => 100 % = 2.12 ms
(2) Rise time: 0 % => 100 % = 2.12 ms
a. 90 V (AC); no-load
b. 265 V (AC); no-load
(1) Rise time: 10 % => 90 % = 17.5 ms
(1) Rise time: 10 % => 90 % = 22.5 ms
(2) Rise time: 0 % => 100 % = 21.7 ms
(2) Rise time: 0 % => 100 % = 25.6 ms
c. 90 V (AC); 2 A load
d. 265 V (AC); 2 A load
Fig 14. Output rise time 10 %  90 % at no-load and 2 A load
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6.6 Output voltage ripple and noise performance
The output voltage ripple and noise performance has been measured with an oscilloscope
probe connected to the output of the demo board. A probe tip was used with a very short
GND connection. A 100 nF ceramic capacitor and a 10 F electrolytic capacitor are used
in parallel with the probe tip to terminate the output. The output voltage ripple and noise
has been measured at 90 V and 265 V both at no-load and 2 A load. Figure 15 and
Figure 16 show the results.
a. 90 V (AC)
b. 265 V (AC)
Fig 15. Output voltage ripple and noise; no-load; cable end (0.15 )
a. 90 V (AC)
b. 265 V (AC)
Fig 16. Output voltage ripple and noise; 2 A load; cable end (0.15 )
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6.7 Inrush current
The inrush current is limited in the demo board by an NTC in series with the mains.
Table 5 shows the value of the peak inrush current.
Table 5.
Inrush current (A peak)
Vin (V)
90 V
115 V
230 V
265 V
Iout = 0 A
8.3 A peak
11.0 A peak
23.3 A peak
27.3 A peak
Iout = 2 A
8.6 A peak
11.1 A peak
24.1 A peak
27.6 A peak
6.8 Short circuit
When the output is shorted, the controller enters hiccup mode. The input power and
average output current is given in Table 6.
Table 6.
Short circuit input power and average output current
90 V (AC)
265 V (AC)
input power
Shorted output
0.97 W
0.87 W
average output current
0.88 A
0.63 A
6.9 Conducted EMI
The conducted EMI is measured according to EN55022 without the secondary GND
connected to the protective mains ground and from 150 kHz to 30 MHz. Figure 17 and
Figure 18 show the results. The red crosses show the quasi peak values.
Fig 17. Conducted EMI 115 V; no ground; 2 A load
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Fig 18. Conducted EMI 230 V; no ground; 2 A load
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6.10 Radiated EMI
The radiated EMI is measured according to EN 55022 (30 MHz to 1 GHz). Figure 19 and
Figure 20 show the measured results.
Fig 19. Radiated EMI at 115 V/2 A load
Fig 20. Radiated EMI at 230 V/2 A load
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6.11 Common-mode noise
Figure 21 shows the result of the EPS switching frequency component of the
common-mode noise test. The switching component is below 2 Vpp.
Fig 21. Common-mode noise EPS switching frequency component at 265 V
6.11.1 Test description
The TEA1720ADB1180 demo board has been connected to a 265 V (AC) power source
where one or the other of the AC mains is a neutral conductor. It has been connected to
the protected earth ground either at the upstream service transformer, or locally in the
laboratory environment.
The demo board has been loaded with a 5 , 1 %, resistive load, at the end of a 1 meter
USB cable. The 5  load is located in a metal box that represents the equivalent
capacitive load of a generic mobile terminal. The EPS switching component has been
measured with an 1:100 oscilloscope probe (50 M // 7.5 pF) between the metal box
ground and the protective earth ground.
The level of the common-mode noise is measured at the worst position, which is around
the mains voltage zero crossing in this case.
The test has been repeated with a 2.5  resistor load. The test result was equal to the 5 
test result.
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6.12 Thermal measurements
The component temperatures were measured using a temperature chamber. The PCB
was placed inside an encasing. To avoid influence of the air flow, the encasing itself is
placed inside a box (see Figure 22).
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Fig 22. Measurement setup temperature chamber
The component temperatures are measured using thermocouples, glued on the
components. The temperatures after 30 minutes warming-up time at 2 A load are shown
in Table 7.
Table 7.
Component temperatures at 2 A load and Tambient = 25 C/45 C
Chamber temperature
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Vin = 90 V; Iout = 2 A
Vin = 265 V; Iout = 2 A
Temperature (C)
Temperature (C)
25
45
25
45
1 EPC17
transformer
67
83
66
84
2 TB100
NPN
83
99
90
109
3 TEA1720
controller
73
89
57
65
4 D50/D51
secondary diodes
73
88
72
88
5 R70/R71/R72
base resistors
90
103
73
92
6 C52
output capacitor
58
75
58
75
7 C2
input capacitor
69
83
60
78
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7. Schematic
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Fig 23. Schematic TEA1720ADB1180 10 W EPC17 demo board
TEA1720ADB1180 10 W EPC17 demo board
Rev. 1 — 2 March 2015
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8. Circuit description
The GreenChip TEA1720ADB1180 demo board consists of a single-phase full wave
rectifier circuit, a filtering section, a switching section, an output section and a feedback
section. The circuit diagram is shown in Figure 23 and the component list is shown in
Table 8.
8.1 Rectification section
The bridge diodes D101 to D104 provide a single-phase full wave rectifier. Capacitors C1
and C2 function as reservoir capacitors for the rectified input voltage. Thermistor RT1
limits inrush current. Terminals J1 and J2 connect the input to the electricity utility network.
Swapping these two wires has no effect on the operation of the converter.
8.2 Filtering section
Inductors L1 and L2, with capacitors C1 and C2, form -filters to attenuate conducted
differential-mode EMI noise.
8.3 TEA1720B3T section
The TEA1720B3T device (U1) contains the oscillator, CV/CC control, start-up control,
protection functions, high-voltage start-up and emitter switch for switching the external
NPN all in one IC.
One auxiliary winding on transformer T1 is used to provide the primary sensing
information for the TEA1720B3T. A second auxiliary winding generates the supply
voltage. This voltage is (half wave) rectified by diode D5 and capacitor C70. C70 is
charged via the current limiter resistor R5. The voltage on C70 is the supply voltage for
the VCC pin of the TEA1720B3T and delivers the base current for the NPN transistor.
The RCD-R clamp consisting of R8, C8, D8 and R9 limits drain voltage spikes caused by
leakage inductance of the transformer.
8.4 Output section
Diodes D50 and D51, Schottky barrier type diodes, filtered by capacitors C51 and C52
rectify the secondary winding of transformer T1. Using a Schottky barrier type diode
results in a higher efficiency of the demo board. C51 and C52 must have sufficient low
ESR characteristics to meet the output voltage ripple and noise requirement without
adding an LC output filter. Capacitor C11 damps high frequency ringing and reduces the
voltage stress on the Schottky diodes. Resistor R50 provides a minimum load to maintain
output control in no-load condition.
8.5 Feedback section
The TEA1720B3T controls the output by current and frequency control for CV / CC
regulation. The auxiliary winding on Transformer T1 senses the output voltage. The FB
pin of the TEA1720B3T senses the reflected output voltage via feedback resistors R30,
R31 and R3. C3 is added for noise filtering.
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TEA1720ADB1180 10 W EPC17 demo board
8.6 Transient controller
The TEA1705 secondary side transient controller offers an excellent transient response of
the TEA1720B3T controller, with ultra-low no-load power and minimum sized output
capacitors. The output voltage is continuously monitored and when the output voltage is
below the detection level Vdet (VCC), a transient interrupt signal is generated. This signal is
transmitted via C10 and the transformer to the primary side to wake up the TEA1720B3T.
This system reduces the volume of the output capacitors and makes it possible to build
compact chargers.
9. PCB layout
a. Top
b. Bottom
Fig 24. Silk screen layers
a. Top
b. Bottom
Fig 25. Copper layers
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10. Bill Of Material (BOM)
Table 8.
TEA1720ADB1180 bill of material
Reference
Description and values
C1; C2
capacitor; 10 F; 20 %; 400 V; ERK2GM100F12OT
ALU; 8.5 mm  14 mm
Aishi
C3
capacitor; 33 pF; 5 %; 50 V;
C0G; 0603
-
-
C7
capacitor; 3.3 nF; 10 %; 50 V; X7R; 0805
-
C8
capacitor; 470 pF; 5 %; 500 V; CC0805JRNPOBBN471
C0G; NP0; 0805
Yageo
C10
capacitor; 47 nF; 10 %; 50 V;
X7R; 0603
-
-
C11
capacitor; 2.2 nF; 10 %; 50 V; X7R; 0603
-
C51; C52
capacitor; 470 F; 20 %;
6.3 V; ALU; 6.3 mm  8 mm
RS80J471MDNASQJT
Nichicon
C53
capacitor; 22 F; 10 %; 10 V;
X7R; 1206
GRM31CR71A226KE15L
Murata
C70
capacitor; 10 F; 20 %; 35 V;
X7R; 1206
C3216X7R1V106M160AC
TDK
C100
capacitor; 100 pF; 10 %;
250 V (AC); CD; X1Y1
CD70-B2GA101KYNS
TDK
D1
diode; Zener; 43 V; 200 mA
BZX384-C43
NXP Semiconductors
D5
diode; 100 V; 250 mA
BAS316
NXP Semiconductors
D7
diode; 50 V; 1 A
ES1AL
Taiwan Semiconductor
D8
diode; 600 V; 1 A
S1JL
Taiwan Semiconductor
D50; D51
diode; 45 V; 10 A
SBR10U45SP5-13
Diodes Inc.
D101; D102; D103;
D104
diode, 1 kV; 1 A
S1ML
Taiwan Semiconductor
J3
connector; USB-A; flat
USB AF DIP - 94 - H
Gold Conn
L101
inductor; 100 H; 10 %;
350 mA
11R104C
Murata
L102
inductor; 10 H; 20 %;
520 mA; 0805
CB2012T100MR
Taiyo Yuden
Q1
transistor; NPN; 400 V; 1 A
TB100
NXP Semiconductors
R1
resistor; 4.7 k; 1 %; 0.1 W;
0805
-
-
R3
resistor; 4.3 k; 1 %; 0.1 W;
0603
-
-
R5
resistor; 1 ; 1 %; 0.1 W;
0603
-
-
R8
resistor; 100 k; 1 %; 0.25 W; 1206
-
R9
resistor; 180 ; 1 %; 0.25 W;
1206
-
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Part number
-
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Manufacturer
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TEA1720ADB1180 10 W EPC17 demo board
Table 8.
TEA1720ADB1180 bill of material …continued
Reference
Description and values
Part number
Manufacturer
R10
resistor; 4.7 ; 1 %; 0.1 W;
0603
-
-
R11
resistor; 22 ; 1 %; 100 mW;
0603
-
-
R30
resistor; 6.2 k; 1 %; 0603
-
-
R31
750 k; 1 %; 0603
-
-
R50
resistor; 3.3 k; 1 %;0.1 W;
0603
-
-
R60
resistor; 0.75 ; 1 %; 0.25 W; 0805
-
R61
resistor; 8.2 ; 1 %; 0.25 W;
0805
-
-
R70; R71; R72
resistor; 560 ; 1 %; 500 mW; 1206
-
R102
resistor; 510 ; 1 %; 200 mW; 0603
-
RF1
fuse; slow blow; 250 V; 2 A
MCPMP 2A 250V
Multicomp
RT1
thermistor; NTC; 10 ; 5 %
NTCLE100E3109JB0
Vishay
T1
transformer; EPC17/17/6;
4:6 pins
750313911
Würth Elektronik
U1
flyback converter,
TEA1720B3T
TEA1720B3T
NXP Semiconductors
U2
IC; TEA1705, SOT23
TEA1705
NXP Semiconductors
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11. Transformer design
11.1 Transformer schematic design and winding construction
The transformer used in the TEA1720ADB1180 demo board has size EPC17.
IO\LQJOHDGV
VHF7,:WXUQV
ZLUHVSDUDOOHO
—P
IO\LQJOHDGV
SULPWXUQV—P
SULPWXUQV—P
DX[LOLDU\9&&WXUQV—P
DX[LOLDU\)EWXUQV
ZLUHVSDUDOOHO
—P
VKLHOGWXUQ DDD
a. Schematic
b. Bottom view
Fig 26. EPC17 transformer schematic and bottom view
Table 9.
UM10886
User manual
Transformer specifications
Feature
Values
bobbin
EPC17
ferrite material
3C90 or equivalent
output voltage
5.3 V at 2 A (150 m cable compensation)
input voltage
90 V to 265 V (AC)
output current
2A
maximum switching frequency
52 kHz
inductance
880 H; ±3 %
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TEA1720ADB1180 10 W EPC17 demo board
11.2 Construction
SLQ
SLQ
DX[9&&
SULPDU\
DX[LOLDU\)E
VHFRQGDU\ 9
FRSSHUVKLHOG
SULPDU\
DDD
(1) Amber: auxiliary winding
(2) Purple: isolation tape
(3) Blue: primary winding
(4) Purple: isolation tape
(5) Red: Fb winding
(6) Purple: isolation tape
(7) Yellow: secondary winding
(8) Purple: only side areas isolation tape
(9) Green: copper foil shield
(10) Purple: isolation tape
(11) Blue: primary winding
Fig 27. EPC17 construction
Table 10.
Wiring description
Wire
Description
1/2 primary 1 layer
50 turns; wire thickness = 150 m
shield
1 turn
secondary 1 layer
7 turns; two wires in parallel;
wire thickness = 450 m TIW
auxiliary Fb
8 turns; 6 wires in parallel; wire thickness
150 m
1/2 primary 1 layer
50 turns; wire thickness = 150 m
auxiliary VCC
19 turns; wire thickness = 150 m
Primary-inductance = 880 H
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12. Points of attention
When testing the CC-mode of the TEA1720B3T, it is necessary to use a DC electronic
load in resistive mode, not in current mode. The current in CC-mode has a small fold back
characteristic (see Figure 4 and Figure 5). When current mode of a DC electronic load is
used, the output voltage drops immediate to zero when the maximum current is exceeded.
When the output voltage becomes zero, causing the input voltage of the used DC
electronic load to become zero as well, many DC electronic loads can no longer adjust the
current. Using the resistive mode of the DC electronic load avoids this problem.
Below Vout = 2.7 V at the PCB end, the TEA1720B3T enters hiccup mode to limit the
output power.
Remark: This behavior of the TEA1720B3T controller is not incorrect. It is only required to
test it in the correct way.
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13. Legal information
13.1 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
13.2 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. NXP Semiconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconductors products in such equipment or
applications and therefore such inclusion and/or use is at the customer’s own
risk.
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suitable and fit for the customer’s applications and
products planned, as well as for the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Evaluation products — This product is provided on an “as is” and “with all
faults” basis for evaluation purposes only. NXP Semiconductors, its affiliates
and their suppliers expressly disclaim all warranties, whether express, implied
or statutory, including but not limited to the implied warranties of
non-infringement, merchantability and fitness for a particular purpose. The
entire risk as to the quality, or arising out of the use or performance, of this
product remains with customer.
In no event shall NXP Semiconductors, its affiliates or their suppliers be liable
to customer for any special, indirect, consequential, punitive or incidental
damages (including without limitation damages for loss of business, business
interruption, loss of use, loss of data or information, and the like) arising out
the use of or inability to use the product, whether or not based on tort
(including negligence), strict liability, breach of contract, breach of warranty or
any other theory, even if advised of the possibility of such damages.
Notwithstanding any damages that customer might incur for any reason
whatsoever (including without limitation, all damages referenced above and
all direct or general damages), the entire liability of NXP Semiconductors, its
affiliates and their suppliers and customer’s exclusive remedy for all of the
foregoing shall be limited to actual damages incurred by customer based on
reasonable reliance up to the greater of the amount actually paid by customer
for the product or five dollars (US$5.00). The foregoing limitations, exclusions
and disclaimers shall apply to the maximum extent permitted by applicable
law, even if any remedy fails of its essential purpose.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
13.3 Trademarks
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
GreenChip — is a trademark of NXP Semiconductors N.V.
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are the property of their respective owners.
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14. Contents
1
2
3
3.1
3.2
3.3
4
5
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.11.1
6.12
7
8
8.1
8.2
8.3
8.4
8.5
8.6
9
10
11
11.1
11.2
12
13
13.1
13.2
13.3
14
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety warning . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Power features . . . . . . . . . . . . . . . . . . . . . . . . . 4
Green features . . . . . . . . . . . . . . . . . . . . . . . . . 4
Protection features . . . . . . . . . . . . . . . . . . . . . . 4
Technical specifications . . . . . . . . . . . . . . . . . . 5
Board photographs . . . . . . . . . . . . . . . . . . . . . . 5
Performance data. . . . . . . . . . . . . . . . . . . . . . . . 6
No-load input power consumption . . . . . . . . . . 6
VI curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Transient response TEA1720B3T . . . . . . . . . 10
Turn-on delay and output rise time . . . . . . . . . 14
Output voltage ripple and noise performance. 16
Inrush current . . . . . . . . . . . . . . . . . . . . . . . . . 17
Short circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Conducted EMI . . . . . . . . . . . . . . . . . . . . . . . . 17
Radiated EMI . . . . . . . . . . . . . . . . . . . . . . . . . 19
Common-mode noise . . . . . . . . . . . . . . . . . . . 20
Test description. . . . . . . . . . . . . . . . . . . . . . . . 20
Thermal measurements . . . . . . . . . . . . . . . . . 21
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Circuit description . . . . . . . . . . . . . . . . . . . . . . 23
Rectification section . . . . . . . . . . . . . . . . . . . . 23
Filtering section . . . . . . . . . . . . . . . . . . . . . . . 23
TEA1720B3T section . . . . . . . . . . . . . . . . . . . 23
Output section . . . . . . . . . . . . . . . . . . . . . . . . 23
Feedback section . . . . . . . . . . . . . . . . . . . . . . 23
Transient controller . . . . . . . . . . . . . . . . . . . . . 24
PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bill Of Material (BOM) . . . . . . . . . . . . . . . . . . . 25
Transformer design . . . . . . . . . . . . . . . . . . . . . 27
Transformer schematic design and winding
construction . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Points of attention . . . . . . . . . . . . . . . . . . . . . . 29
Legal information. . . . . . . . . . . . . . . . . . . . . . . 30
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP Semiconductors N.V. 2015.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 2 March 2015
Document identifier: UM10886