iW1710-01 for 12V@1.

5A
Adapter Design

General Design Specification :

1. AC Input Range 90-264Vac
2. DC Output 12V, 1.5A
3. Meet “EPA_2.0” Requirement with 20AWG/1.8m DC-Cable
4. Max Ripple <240mVP_P
 1. Specification

Description Symbol Min Typ Max Units Comment

Input
Voltage VIN 90 264 VAC 2 Wire
Frequency fLINE 47 50/60 63 Hz
No-load Input Power (230VAC) 0.3 W
Output
Output Voltage VOUT 11.4 12 12.6 V Measured at the end of Cable(20AWG,1.8M)

Output Current IOUT 0 1.5 A

Measured at the End of DC Output cable
Output Ripple Voltage VRIPPLE 240 mVP_P
IOUT=3A @20 MHz Bandwidth

Total Output Power

Continuous Output Power POUT 18 W
Over Current Protection IOUT_OCP 2.3 A Auto-restart

Measured at end of PCB, VIN = 115VAC and

Efficiency  80.3 % 230Vac, IOUT= 3A. (TA = 25 ℃)

Environmental
Conducted EMI Meets CISPR22B / EN55022B
Designed to meet IEC60950,
Safety
UL60950 Class II
Ambient Temperature TAMB 0 40 °C Free convection, sea level

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 2

 1 2 3 4 5 6

2.Schematic Circuit

D F1 D1 D
L
1N4007
2A/250V R1 L1 R3
1

2
R6
1.2M L-UU9.8 3M
D2 510K
1

2
R8 C2
1

150K 1nF 500V

CX1 1N4007 C1
0 .2 2 U F X 2

R7
21

3 3uF / 4 00 V
MOV D3 R4
3M 510K
R2
2

1N4007 D9 10A/100V
1.2M T1
4

7
0.27*96TS D4 R9
4

7
R5 68R V+
N
510K
1N4007

2
C D5 L2 C
RS1ML
C9

2
R20
D8 470pF 33R

6
2
2
12V 1.5A

6
R10 C10 C11 C12 ZD1 R21
1N4148 IC1 D6
FR102 4.7R 3
R15

6 80 U F / 1 6 V

2 .7 K
3

3
7 8

6 80 uF / 16 V
O UT PU T V CC

1 5V 1 W
100R 3

3
1 04 pF
Q1 V IN
0.7*4.5TS
4N60 6
ISEN SE V SEN SE
2
R16
22K 1 R12 R11 4
NC 4 V-
10K 10K
5 4
G ND SD

IW1710

5
R17
B B
1K

5
R14 C3 D7
C8 C6 C5 C4 CY1
R18 R19 22pF
NC

1.5R 1.2R R13

1 N 4 14 8
5 0V
3 30 pF

C7
0 .1/uF

3 .9 K
1 0pF

102pF Y1
NTC1
1 0uF

10pF 1 2
1 2
NC

ESD
1 2
1 2
ESD

Optional:
OVP and OTP circuit
A A

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design Title 3

 3. Option Circuit for OTP&OVP

Option-1: Both OTP and OVP Option-2: OTP Only Option-3: OVP Only

* OTP and OVP circuit * OTP circuit * OVP circuit

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 4

 4. Circuit Board Photograph

34.5mm

Primary Side QR Mode Controller iW1710-01

59.5mm

20mm

1.6mm
3.0mm MAX

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 5

 5. Bill of Material

Item Qty. Ref. Description Item Qty. Ref. Description

1 1 IC1 iW1710-01, Off-line digital QR Mode Controller, SO-8 23 1 ZD1 15V 1W 5%
2 1 C1 33uF, 400V, E-CAP 13x21 24 1 Q1 STB4NK60, 4A/600V, MOSFET, TO-220

3 1 C2 1nF,500V, SMD-0805 25 2 R1,R2 1.2MΩ ±5﹪, SMD-1206

4 1 C3 10uF,50V,E-CAP,5x11.5, low ESR 26 1 R3 3.0MΩ±5﹪,SMD-1206

5 1 C4 0.1uF,25V, SMD-0603 27 1 R4 3.0MΩ ±5﹪, SMD-1206

6 1 C5 330pF,25V, SMD-0603 28 3 R5,R6,R7 510KΩ ±5﹪, SMD-0805
7 1 C6 10pF,25V, SMD-0603 29 1 R8 150KΩ ±5﹪, SMD-1206
8 1 C7 10pF,25V, SMD-0603 30 1 R9 68Ω ±5﹪, SMD-1206
9 1 C8 22pF,25V, SMD-0603 31 1 R10 4.7Ω ±5﹪,SMD-0805
10 1 C9 470pF, 100V, SMD-0805 32 1 R11 10KΩ ±1﹪,SMD-0805
11 1 C10.C11 680uF 16V,8x20,low ESR 33 1 R12 10KΩ ±1﹪,SMD-0603
12 2 C12 104pF,25V, SMD-1206 34 1 R13 3.9K ±1﹪, SMD-0603
13 1 CX1 0.22uF, 275V,X2 35 1 R14 NC
14 1 CY1 Y-CAP, 1nF,Y1 36 1 R15 10Ω ±5﹪,1/8W
15 4 D1,D2,D3,D4 1N4007, Rectifier Diode DO-41 37 1 R16 22KΩ ±5﹪,SMD-0603
16 1 D5 RS1ML,Fast Rectifier Diode,SMD 38 1 R17 1KΩ ±5﹪,1/8W
17 1 D6 FR102, Fast Rectifier Diode DO-41 39 2 R18, 1.5Ω ±1﹪,SMD-1206
18 2 D7,D8 1N4148,Fasr Recifier Diode LL-34 40 1 R19 1.2Ω ±1﹪,SMD-1206
19 1 D9 MBR10100, schottcky, TO-220 41 1 R20 33Ω ±5﹪, SMD-1206
20 1 F1 2A/250V, Fuse 42 1 R21 2.7KΩ ±5﹪, SMD-1206
21 1 L1 UU9.8, 15mH,CM-chock Inductor, 43 1 T1 EE22, Transformer
22 1 L2 150uH,CM-chock Inductor,T8.5X4.5X3 44 1 PCB single side PCB, 94V0

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 6

 6. Transformer Drawing
SCHEMATIC Winding Start pin-5 & 1
NC End pin-2 in “Clockwise”
Fly-A direction – looking from Rotating direction
Forward-1 Forward-2 Pin 1/5 side of the of winding machine
8T 17T 10T Bobbin. 5
4
S-1
4
Primary-2 Fly-B
17T
Fly-A (F)
4(F) 2T Tape
2
NC
Primary-1 43T
4(S) 2UEW 0.1mm 17T Forward -1(Clockwise)

5 Note: 2UEW 0.3mm 17T Primary-2 (Clockwise)

1. Dot (●) denote 2(S)
1 electrical start. 3T tape
2. Electrical start could be
Bias
8T different to Mechanical
start. Triple Insulated Wire
0.55mm_10T–Secondary (Clockwise) Fly-B (S)
3 3. Ferrite core is to be
1T tape
connected to Pin (3) 3(F)

ELECTRICAL SPECIFICATIONS: 4(S) 2UEW 0.22mmX2 8T- Forward -1(Clockwise)

1. Primary Inductance (Lp) =580uH+ 7% @10KHz
2. Electrical Strength = 3KV, 50/60Hz,1Min(pins1~5 to pins A~B) 1(S) 2UEW 0.22mmX2 8T- Bias (Clockwise)
1T tape
MATERIALS:
1. Core : EE22(Ferrite Material TDK PC40 or equivalent) 2(F) 2UEW 0. 35mmx1_21T – Primary-1 (Clockwise)
2. Bobbin : EE22 Vertical
3. Magnet Wires : Type 2-UEW 5(S) 2UEW 0.35mmx1_22T – Primary-1 (Clockwise)
4. Layer Insulation Tape :3M1298 or equivalent.
FINISHED :
1. Varnish the complete assembly

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 7

 7. Regulation, Ripple and Efficiency Measurement

Spec. Vout(V): 9 Iout(mA) 2000

VI N PI N VO U T IO U T VR I P P L E PO U T η OCP Average EPA2.0
(V A C ) (W) (V) (A) (mV P - P ) (W) (%) (A) η (%) η(%)
0.110 11.88 0.000 15
5.270 11.88 0.375 32 4.46 84.54
90 10.390 11.91 0.750 32 8.93 85.97 1.970 84.96
15.720 11.91 1.125 54 13.40 85.23
21.240 11.91 1.500 110 17.87 84.11
0.120 11.88 0.000 24
5.270 11.89 0.375 30 4.46 84.61
115 10.370 11.90 0.750 30 8.93 86.07 1.960 85.66
15.540 11.91 1.125 40 13.40 86.22
20.830 11.91 1.500 50 17.87 85.77
80.30
0.230 11.89 0.000 20
5.420 11.88 0.375 36 4.46 82.20
230 10.710 11.90 0.750 34 8.93 83.33 1.830 84.01
15.770 11.91 1.125 38 13.40 84.96
20.880 11.91 1.500 46 17.87 85.56
0.280 11.89 0.000 22
5.510 11.89 0.375 42 4.46 80.92
264 10.900 11.90 0.750 34 8.93 81.88 1.760 82.90
15.960 11.91 1.125 38 13.40 83.95
21.070 11.92 1.500 52 17.88 84.86

Note: Output voltage measured at end of PCB

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 8

 8. EPA_2.0 Requirement

EPA2.0 (Final) for Standard Models (Pno=18W) :

Measure at end of Cable

VIN IOUT PIN Measure at end of PCB
(22AWG/1.8m, RCable=0.23Ω)
VOUT_PCB POUT_PCB EFF_PCB AV-EFF_PCB VOUT_Cable POUT_Cable EFF_Cable AV-EFF_Cable
(VAC) (mA) (W)
(V) (W) (%) (%) (V) (W) (%) (%)
0.375 5.27 11.89 4.46 84.61 11.80 4.43 83.99
0.750 10.37 11.90 8.93 86.07 11.73 8.80 84.82
115 85.66 84.11
1.125 15.54 11.91 13.40 86.22 11.65 13.11 84.35
1.500 20.83 11.91 17.87 85.77 11.57 17.35 83.28
0.375 5.42 11.88 4.46 82.20 11.79 4.42 81.60
0.750 10.71 11.90 8.93 83.33 11.73 8.80 82.13
230 84.01 82.48
1.125 15.77 11.91 13.40 84.96 11.65 13.11 83.12
1.500 20.88 11.91 17.87 85.56 11.57 17.35 83.08

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 9

 9. Output VI Characteristics
* Note: Output voltage is measured at end of PCB

VIN=90Vac/50Hz VIN=264Vac/50Hz
VOUT(1V/Div)

VOUT(1V/Div)
IOUT(500mA/Div) IOUT(500mA/Div)

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 10

 10. Turn On Delay Time

115VAC,Full Load
90VAC,Full Load
TST_DELAY=1.02S
TST_DELAY=1.27S

230VAC,Full Load
264VAC,Full Load
TST_DELAY=0.52S
TST_DELAY=0.43S

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 11

 11. AC Startup Voltage Characteristic

No Load, VIN_STARTUP =61.4VAC Full Load, VIN_STARTUP =75.5VAC

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 12

 12. AC Brownout Voltage Characteristic

No Load, VIN_STARTUP =37.1VAC Full Load, VIN_STARTUP =77.2VAC

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 13

13.1 Dynamic Load Response
Condition: 1). Load: 0A-0.75A-0A 2).Slew-Rate: 0.15A/uS 3).Freq.: 100Hz 4). Duty-Cycle: 50%

* Note: Output voltage is monitored at end of PCB

Vin=90VAC Vin=115VAC

Vin=230VAC Vin=264VAC

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 14

13.2 Dynamic Load Response
Condition: 1). Load: 0.75A-1.5A-0.75A 2).Slew-Rate: 0.15A/uS 3).Freq.: 100Hz 4). Duty-Cycle: 50%

* Note: Output voltage is monitored at end of PCB

Vin=90VAC Vin=115VAC

Vin=230VAC Vin=264VAC

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 15

 14. VDS Waveform

Test Condition:
VIN=264VAC,IOUT=1.5A

Result:
VDS_MAX=536V

Appendix – Simple Specification for used Transistor (STB4NK60Z)

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 16

 15. Conducted EMI

VIN=230Vac, Live

QP

AV

VIN=230Vac, Neutral

QP

AV

Note: Full & Resistive Load and output is Grounded

28-Sep-09 iW1710-01 for 12V@1.5A Adapter Design 17