Rev 2.5 Oct 2012
www.active-semi.com
AC/DC Charger/Adapter Reference Designs
ACT36X, ACT33X
Innovative Green Power Solutions
Innovative Green Power Solutions
For information regarding Active-Semi products, sales and authorized distributors, please contact: sales@active-semi.com.
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
Application Change Note
Revision History 2012-Oct– 19 Rev 2.5
Page 12~13 Update SCH and Transformer ( Lp and NP/NS/NAUX )
Update BOM List( C1,C2,R5,R6,R9,R10 )
Update SCH and Transformer ( Lp and NP/NS/NAUX )
Update BOM List( R5,R6,R9,R10 )
Cover page Change title
Page 14~15
c: PSR is Primary-Side Regulation
For information regarding Active-Semi products, sales and authorized distributors, please contact: sales@active-semi.com.
● Chargers for Cell Phones, PDAs, MP3, PMPs, DSCs, and Other Portable Devices
● RCC Adapter or Linear Adapter Replacements
● Standby and Auxiliary Supplies
● White LED Lighting
Applications
AC/DC Converters – ActivePSRTM
Part
Number Output Power Technology Standby Power
Consumption Switching
Frequency Package
ACT361 6.0W PSRc < 150mW @ VAC = 230V Adjustable to 40kHz SOT23-6
ACT364 6.5W PSRc < 150mW @ VAC = 230V Adjustable to 80kHz SOT23-6
ACT365 12.5W PSRc < 150mW @ VAC = 230V Adjustable to 80kHz SOP8
ACT366 14.5 W PSRc < 150mW @ VAC = 230V Adjustable to 80kHz SOP8-EP
ACT334 6.5W PSRc < 30mW @ VAC = 230V Adjustable to 80kHz SOT23-6
ACT336 7.0W PSRc < 30mW @ VAC = 230V Adjustable to 80kHz SOP8
ACT337 12.5W PSRc < 30mW @ VAC = 230V Adjustable to 80kHz SOP8
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
Table of Contents
1. ACT361 5V 1000mA Universal Charger ……………………………………………..………….…………….…………4
2. ACT364 5V 1000mA Universal Charger ……………………………………………..………….…………….…………6
3. ACT365 5V 2100mA Universal Charger……………………………….………………………………….……...………8
4. ACT366 12V 1000mA Universal Charger …………….…………………..…….…….……………...………..………..10
5. ACT334 5V 700mA Universal Charger …………………….…………..…….…….…………………………..…….....12
6. ACT334 5V 1000mA Universal Charger …………………….…….…..…….…….…………………………..…….....14
7. ACT336 5V 1200mA Universal Charger ……….…………………..…….…...………...…………………..………….16
8. ACT337 5V 1500mA Universal Charger ……….……………………..…….…...……………………….....………….18
9. ACT337 5V 2100mA Universal Charger ……….……………………..…….…...……………………….....………….20
Active-Semi (Shanghai) Office Contact Information
Fast Technical Support
Contact Person: Peter (Director of Product Line)
Tel: (86-21) 5108 2797#865; Mobile Phone: 135 8558 2743; E-mail box: Peterhuang@active-semi.com.
Address: RM1202,Sunplus Building,No.1077 Zuchongzhi Road, Zhangjiang High Tech Park, Shanghai
201203, China
-4-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT361 5V/1000MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT361 to provide output power of
5V1000mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit (D1-
D4,C1, L1, L2, C2),power drive circuit (BD pin,
Q1), secondary rectified circuit (D7, C6) and the
IC control circuit. ACT361 is a Primary Side
Regulator (PSR) so that the power supply unit
can regulate current and voltage without Opto-
coupler. Pin 4 and Pin 2 are the VDD and ground
pins to provide power for the IC. Pin 3 is the base
drive for the NPN transistor. Pin 1 is the switching
pin. Pin 5 is the feedback pin that senses the out-
put current and output voltage. Pin 6 is the peak
current sense pin. Resistance of R7 determines
the output DC cord compensation percentage.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, DSCs, and Other Portable Devices and Ap-
pliances.
Key Component Selection
The maximum output current is decided by for-
mula(1).
Lp is the transformer inductance value, Rcs is the
current sense resistor, which is shown as R4 in
the schematic. Fsw is the switching frequency,
which design value is 45kHz. is the overall sys-
tem efficiency, which value is approximately
equal to 70%. Voutcc is the output voltage, which
setting is through the flyback voltage of auxiliary
winding and the feedback resistor R8, R9 as
shown in formula (2).
Np/Ns/Naux (140/10/14) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 1000mA are used to do the
design. Ns and Naux are number of turns of sec-
ondary and auxiliary of the transformer. VSEC_R
is the forward voltage drop of the output rectifier
diode at approximately 0.1A bias. The peak cur-
rent limit is set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
9
8
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT361 150mW 5V 5W EE16 Flyback
Figure 1:
Schematic of Charger
L=51.0mm
W=31.1mm
H=14.2mm
(2)
(1)
-5-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT361 5V/1000MA CHARGER
Bill of Materials
Transformer Specitication
Build up
Note:1.SH1,SH2 are shielding; P1 & P2 are primary and S1 is
secondary.(Bobbin:EE16)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 5 and 3 at
1Vac & 1kHz 1.7mH±7%
3 P1 Leakage
Inductance Inductance between pins 3 and 5 with
pins 1-2 and 6-8 shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
CC/CV CURVE
EVALUATION KITS Vin Vo Io
ACT361-01 85-264Vac 4.75-5.25V 1000-1268mA
Wind-
ing
Terminal Turns Wire Insulation
Start Fin-
ish Type Size*QTY Layer Thick/Wide Lay
er
P1
3 --> 47 2UEW 0.15*1 1 0.025*8.5W
2
<-- <-- 47 2UEW 0.15*1 1 0.025*8.5W
--> 5 46 2UEW 0.15*1 1 0.025*8.5W
SH1 2 NC 8 2UEW 0.12*1 1 0.025*8.5W 2
S1 8 6 10 TEX-E 0.50*1 1 0.025*8.5W 2
P2
4 2
14 2UEW 0.15*2 1 0.025*8.5W
1 4
SH2 Core 5 1 Conductor 0.15*1 1 0.025*10 2
2
REF DESCRIPTION MFTR
C1,C2 Capacitor, Electrolytic, 6.8µF/400V, 10x12mm KSC
C3 Capacitor, Ceramic,1000pF/500V,1206,SMD POE
C4 Capacitor, Electrolytic,10µF/50V,5x11mm KSC
C5 Capacitor, Electrolytic, 680µF/10V, 8x12mm KSC
C6 Capacitor, Electrolytic, 220µF/10V, 5x11mm KSC
C7 Capacitor, Ceramic,1000pF/50V, 0805, SMD POE
D1-D4 Diode,Rectifier,1000V/1A,1N4007, DO-41 Good-Ark
D5,D6 Diode,Ultra Fast, FR107,1000V/1.0A, DO-41 Good-Ark
D8 Diode, schottky, 40V/2A, SB210, DO-15 Good-Ark
L1 Axial Inductor, 2.2mH, 0410,Dip Amode Tech
L2 Axial Inductor, 220µH, 0410,Dip Amode Tech
Q2 Transistor, HFE 20-25, NPN,D13003X,TO-126 Huawei
PCB1 PCB, L*W*T=58x31.2x1.6mm,Cem-1,Rev:A Jintong
FR1 Wire Round Resistor,1W,10 ,KNP, 5% TY-OHM
R1 Chip Resistor, 750k, 1206, 5% TY-OHM
R2,R3 Chip Resistor, 5.1M, 1206, 5% TY-OHM
R4 Chip Resistor, 0.787, 1206,1% TY-OHM
R5 Chip Resistor, 22, 0805, 5% TY-OHM
R6 Chip Resistor, 22, 0603, 5% TY-OHM
R7 Chip Resistor, 162k, 0805, 5% TY-OHM
R8 Chip Resistor, 54.9k, 0805,1% TY-OHM
R9 Chip Resistor, 9.76k, 0805, 1% TY-OHM
R11 Chip Resistor, 1.2k, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
R14,R15 Chip Resistor, 2.2k ohm, 0805, 5% TY-OHM
T1 Transformer, Lp=1.7mH, EE16
U1 IC, ACT361,SOT23-6 Active-Semi.
USB USB, Rev:A
S1
6
P2
1
2
P2
5
3
8
NC
Core(SH2)
4
P1
Pin1
Reverse
-6-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT364 5V/1000MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT364 to provide output power of
5V1000mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(BD1,C1, L1,C2),power drive circuit (BD pin, Q1),
secondary rectified circuit (D8,C5,C6) and the IC
control circuit. ACT364 is a Primary Side Regula-
tor (PSR) so that the power supply unit can regu-
late current and voltage without Opto-coupler. Pin
4 and Pin 2 are the VDD and ground pins to pro-
vide power for the IC. Pin 3 is the base drive for
the NPN transistor. Pin 1 is the switching pin. Pin
5 is the feedback pin that senses the output cur-
rent and output voltage. Pin 6 is the peak current
sense pin. Resistance of R10 determines the
output DC cord compensation percentage.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, DSCs, and Other Portable Devices and Ap-
pliances.
Key Component Selection
The maximum output current is decided by for-
mula(1).
Lp is the transformer inductance value, Rcs is the
current sense resistor, which is shown as R9 in
the schematic. Fsw is the switching frequency,
which design value is 75kHz. is the overall sys-
tem efficiency, which value is approximately
equal to 70%. Voutcc is the output voltage, which
setting is through the flyback voltage of auxiliary
winding and the feedback resistor R5, R6 as
shown in formula (2).
Np/Ns/Naux (147/9/24) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 1000mA are used to do the
design. Ns and Naux are number of turns of sec-
ondary and auxiliary of the transformer. VSEC_R
is the forward voltage drop of the output rectifier
diode at approximately 0.1A bias. The peak cur-
rent limit is set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT364 150mW 5V 5W EPC13 Flyback
Figure 1:
Schematic of Charger
L=41.3mm
W=28.1mm
H=13.2mm
(1)
(2)
-7-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT364 5V/1000MA CHARGER
Bill of Materials
Transformer Specitication
Build up
Note:1.SH1,SH2 are shielding; P1 & P2 are primary and S1 is
secondary.(Bobbin:EPC13)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 1 and 4 at
1Vac & 1kHz 1.75mH±7%
3 P1 Leakage
Inductance Inductance between pins 1 and 4 with
pins 2-3 and 6-10 shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
CC/CV CURVE
EVALUATION KITS Vin Vo Io
ACT364_00_1 85-264Vac 4.75-5.25V 1000-1300mA
Wind-
ing
Terminal Turns Wire Insulation
Start Fin-
ish Type Size*QTY Layer Thick/Wide Lay
er
P1
4 --> 49 2UEW 0.12*1 1 0.025*8.5W
<-- <-- 49 2UEW 0.12*1 1 0.025*8.5W
--> 1 49 2UEW 0.12*1 1 0.025*8.5W
SH1 2 NC 49 2UEW 0.12*1 1 0.025*8.5W
P2 2 3 24 2UEW 0.12*1 1 0.025*8.5W 1
S1 10 6 9 TEX-E 0.40*1 1 0.025*8.5W 2
SH2 2 Core 1 3
REF DESCRIPTION MFTR
C1 Capacitor, Electrolytic, 4.7µF/400V,8 ×12mm Koshin
C2 Capacitor, Electrolytic, 6.8µF/400V,8 ×12mm Koshin
C3 Capacitor, Ceramic,1000pF/500V,1206,SMD POE
C4 Capacitor, Ceramic,4.7uF/35V,0805,SMD POE
C5,C6 Capacitor, Solid, 330µF/6.3V, 6.3 ×9mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
BD1 Bridge,B6S,600V/0.5A,MDI,SMD PANJIT
D5,D6 Diode, Ultra Fast, RS1M,1000V/1.0A, SMA Good-Ark
D8 Diode, Schottky, 40V/3A, SK34, SMB Good-Ark
L1 Axial Inductor, 1.5mH, 0410, DIP Amode Tech
Q1 Transistor, NPN, 700V,1.5A, D13003, TO-251AB Huawei
PCB1 PCB, L*W*T=42x28 x1.0mm, FR-4,Rev:ACT364_00_1 Jintong
FR1 Fusible Resistor, 1W, 10, 5% TY-OHM
R1,R4 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 470, 0805, 5% TY-OHM
R3 Chip Resistor, 750k , 0805, 5% TY-OHM
R5 Chip Resistor, 61k , 0805, 1% TY-OHM
R6 Chip Resistor, 11. 8k, 0805, 1% TY-OHM
R7,R8 Chip Resistor, 5.1M, 0805, 5% TY-OHM
R9 Chip Resistor, 1.07, 1206, 1% TY-OHM
R10 Chip Resistor, 162k, 0805, 5% TY-OHM
R11 Chip Resistor, 1.1k, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
R14 Bead, GZ2012D121,0805 KC
T1 Transformer, LP = 1.75mH±7%, EPC13
U1 IC, ACT364US-T, SOT23-6 Active-Semi
0.00
20.00
40.00
60.00
80.00
100.00
120.00
90 115 230 264
Standy Power (W)
Input Voltage (VAC)
Sta ndby Powe r Vs Input Voltage
0.00
1.00
2.00
3.00
4.00
5.00
6.00
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
Out put Voltage(V)
Out put Curr ent(m A)
V-I Charact erist ic Vs Vin(25℃)
90V
115V
230V
264V
High limit
Low limit
-8-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT365 5V/2100MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT365 to provide output power of
5V2100mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(BD1,C1, C2),power drive circuit (BD pin, Q1),
secondary rectified circuit (D8, C5,C6) and the IC
control circuit. ACT365SH is a Primary Side
Regulator (PSR) so that the power supply unit
can regulate current and voltage without Opto-
coupler. Pin 6 and Pin 2,4,7 are the VDD and
ground pins to provide power for the IC. Pin 8 is
the base drive for the NPN transistor. Pin 1 is the
switching pin. Pin 5 is the feedback pin that
senses the output current and output voltage. Pin
3 is the peak current sense pin. Resistance of
R10 determines the output DC cord compensa-
tion percentage. This circuit can be used as uni-
versal charger for Cell Phones, PDAs,
MP3,Portable Media Players, Shaver, DSCs, and
Other Portable Devices and Appliances.
Key Component Selection
The maximum output current is decided by for-
mula (1).
Lp is the transformer inductance value, Rcs is the
current sense resistor, which is shown as R9 in
the schematic. Fsw is the switching frequency,
which design value is 75kHz. is the overall sys-
tem efficiency, which value is approximately
equal to 70%. Voutcc is the output voltage, which
setting is through the flyback voltage of auxiliary
winding and the feedback resistor R5, R6 as
shown in formula (2).
Np/Ns/Naux (110/8/18) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 2100mA are used to do the
design. Ns and Naux are number of turns of sec-
ondary and auxiliary of the transformer. VSEC_R
is the forward voltage drop of the output rectifier
diode at approximately 0.1A bias. The peak cur-
rent limit is set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT365SH 150mW 5V 10.5W EPC17 Flyback
Figure 1:
Schematic of Charger
L=40.0mm
W=28.1mm
H=22.1mm
(1)
(2)
-9-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT365 5V/2100MA CHARGER
Bill of Materials
REF DESCRIPTION MFTR
C1, C2 Capacitor, Electrolytic, 10µF/400V, 10×16mm KSC
C3 Capacitor, Ceramic,1000pF/500V,1206,SMD POE
C4 Capacitor, Ceramic, 10µF/35V,1206,SMD KSC
C5 Capacitor, Electrolytic, 1000µF/6.3V, 8 ×16mm KSC
C6 Capacitor, Electrolytic, 820µF/6.3V, 6.3 × 16mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
CY1 Safety Y1,Capacitor,1000pF/400V,Dip UXT
BD1 Bridge Rectifier,D1010S,1000V/1.0A,SDIP PANJIT
D5 Fast Recovery Rectifier, RS1M,1000V/1.0A, RMA PANJIT
D6 Fast Recovery Rectifier,RS1D,200V/1.0A,SMA PANJIT
D8 Diode, Schottky, 45V/10A, S10U45S, SMD Diodes
L1 Choke Coil, 1.5mH, ¢6x8mm, DIP Amode
Q1 Transistor, NPN, 700V,D13005,TO-126 Huawei
F1 Fuse:1A 250V 3.6*10mm With Pigtail, ceramic tube walter
R1 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 300k,1206, 5% TY-OHM
R3 Chip Resistor, 390,1206, 5% TY-OHM
R4 Chip Resistor, 15, 0805, 5% TY-OHM
R5 Chip Resistor, 80.6k,0805, 1% TY-OHM
R6 Chip Resistor,19.1k,0805, 1% TY-OHM
R7 Chip Resistor, 10M, 1206, 5% TY-OHM
R9 Chip Resistor, 0.65,1206, 1% TY-OHM
R10 Chip Resistor, 162k,0805, 5% TY-OHM
R11 Chip Resistor, 1.1k, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
T1 Transformer, LP = 1.25mH±7%, EPC17
USB Double-layer USB Rev:A
U1 IC, ACT365SH-T, SOP-8 ACT
S/H1 AL HeatSink, LxWxH=7.5x17x2.0mm
PCB1 PCB, L*W*T=40x28.1x1.6mm,Cem-1,Rev:A Jintong
Transformer Specitication
Build up
Wind-
ing
Terminal Turns Wire Insulation
Start Finish Type Size*QTY Layer Thick/Wide Layer
P1 2 3 74 2UEW 0.22*1 1 0.025*8.5W 2
SH1 --> 4 0.9 Copper 0.7mm 1 0.025*8.5W 2
S1 B A 8 TEX-E 0.75*1 1 0.025*8.5W 2
P2 5 4 18 2UEW 0.14¢*3 1 0.025*8.5W 2
P3 3 1 36 2UEW 0.22¢*1 1 0.025*8.5W 2
SH2 4 core 3 Copper
wire 0.15*1 1 0.025*8.5W 5
Note:1.SH1,SH2 are shielding; P1, P2 are primary and S1 is
secondary.(Bobbin:EPC17)
Electrical Specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and secon-
dary 3000Vac
2 P1 Inductance Inductance between pins 1 and 3 at 1Vac
& 1kHz 1.25mH±7%
3 P1 Leakage
Inductance Inductance between pins 1 and 3 with
pins 4-5 and A-B shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
EVALUATION KITS Vin Vo Io
ACT365-01 85-264Vac 4.75-5.25V >2100mA
S1
A
P2
5
4
P1
3
2
SH1
B
NC
1
Pin4(SH2)
Reverse
Core
P3
-10-
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT366 12V/1000MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT366YH to provide output power of
12V1000mA. This circuit is a typical flyback
power supply which includes the AC rectified cir-
cuit (BD1,C1, C2),power drive circuit (BD pin,
Q1), secondary rectified circuit (D8, C5,C6) and
the IC control circuit. ACT366YH is a Primary
Side Regulator (PSR) so that the power supply
unit can regulate current and voltage without
Opto-coupler. Pin 6 and Pin 2,4,7 are the VDD
and ground pins to provide power for the IC. Pin
8 is the base drive for the NPN transistor. Pin 1 is
the switching pin. Pin 5 is the feedback pin that
senses the output current and output voltage. Pin
3 is the peak current sense pin. Resistance of
R10 determines the output DC cord compensa-
tion percentage. This circuit can be used as uni-
versal charger for Cell Phones,PDAs,
MP3,Portable Media Players, Shaver, DSCs, and
Other Portable Devices and Appliances.
Key Component Selection
The maximum output current is decided by for-
mula (1).
Lp is the transformer inductance value, Rcs is the
current sense resistor, which is shown as R9 I
the schematic. Fsw is the switchin frquency,which
design value is 75kHz. is the overall system
efficiency, which value is approximately equal to
70%. Voutcc is the output voltage, which setting
is through the flyback voltage of auxiliary winding
and the feedback resistor R5, R6 as shown in
formula (2).
Np/Ns/Naux (96/9/12) must be designed correctly
to ensure it operates in DCM in all conditions. A
design value Voutcc equal to 12V and Ioutcc_min
equal to 1000mA are used to do the design. Ns
and Naux are number of turns of secondary and
auxiliary of the transformer. VSEC_R is the for-
ward voltage drop of the output rectifier diode at
approximately 0.1A bias. The peak current limit is
set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT366HY 150mW 12V 12W EE20 Flyback
Figure 1:
Schematic of Charger
L=45.8mm
W=33.3mm
H=22.4mm
(1)
(2)
-11-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT366 12V/1000MA CHARGER
Bill of Materials
REF DESCRIPTION MFTR
C1 Capacitor, Electrolytic, 10µF/400V, 10 × 12mm KSC
C2 Capacitor, Electrolytic, 15µF/400V, 10 × 12mm KSC
C3 Capacitor, Ceramic,1000pF/500V,1206, SMD POE
C4 Capacitor, Electrolytic, 47µF/35V, 5 × 11mm KSC
C5 Capacitor, Electrolytic, 330µF/25V, 8 × 12mm? KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
CY1 Safety Y1,Capacitor,1000pF/400V,Dip UXT
BD1 Bridge,Rectifier,1000V/1A,MB10M, SMD
D5 Diode, Ultra Fast, FR107,1000V/1.0A, DO-41 Good-Ark
D6 Diode, Switching,75V/150mA,LL4148, MICRO-MELF Good-Ark
D8 Diode, Schottky, 60V/5A, SB560, DO-201AD PANJIT
L1 Common choke mode, UU9.8,20mH, DIP
Q1 Transistor, NPN, 700V,1.5A, D13003, TO-220 Huawei
F1 Fuse:1A 250V 3.6*10mm With Pigtail, ceramic tube walter
R1 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 300k, 1206, 5% TY-OHM
R3 Chip Resistor, 0, 1206, 5% TY-OHM
R4 Chip Resistor, 10, 0805, 5% TY-OHM
R5 Chip Resistor, 59k, 0805, 1% TY-OHM
R6 Chip Resistor, 9.09k, 0805, 1% TY-OHM
R7 Chip Resistor, 2.7M, 1206, 5% TY-OHM
R9 Chip Resistor, 0.604, 1206, 1% TY-OHM
R10 Chip Resistor, 330k, 0805, 5% TY-OHM
R11 Chip Resistor, 5K, 0805, 5% TY-OHM
R12,R14 Chip Resistor, 2.2K, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
T1 Transformer, LP = 1.2mH±7%, EE20
U1 IC, ACT366YH-T, SOP8-EP Active-Semi
S/H1 AL HeatSink, LxWxH=15x23x2.0mm
PCB1 PCB, L*W*T=45.8x33.3x1.6mm,Cem-1,Rev:A Jintong
Transformer Specitication
Build up
Wind-
ing
Terminal Turns Wire Insulation
Start Finish Type Size*QTY Layer Thick/Wide Laye
r
5 --> 32 2UEW 0.25*1 1 0.025*8.5W
--> 3 32 2UEW 0.25*1 1 0.025*8.5W 2
SH1 --> 1 0.9 Copper 0.7mm 1 0.025*8.5W 2
S1 B A 9 TEX-E 0.4*2 1 0.025*8.5W 2
P2 2 1 12 2UEW 0.25*3 1 0.025*8.5W 2
P1 3 4 32 2UEW 0.25*1 1 0.025*8.5W 2
SH2 1 core 3 Con-
ductor 0.25*1 1 0.025*10 5
P1
Note:1.SH1 and SH2 are shielding; P1 & P2 are primary and S1
is secondary.(Bobbin: EE20)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 4 and 5 at
1Vac & 1kHz 1.2mH±7%
3 P1 Leakage
Inductance Inductance between pins 4 and 5 with
pins 2-1 and A-B shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
CC/CV CURVE
EVALUATION KITS Vin Vo Io
ACT366-01 85-264V ac 11.4-12.6V >1000mA
SH1
-12-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT334 5V/700MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT334 to provide output power of
5V/700mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(D1,D2,D3,D4,C1,L1, C2),power drive circuit (BD
pin, Q1), secondary rectified circuit (D8, C5,C6)
and the IC control circuit. ACT334 is a Primary
Side Regulator (PSR) so that the power supply
unit can regulate current and voltage without
Opto-coupler. Pin 4 and Pin 2 are the VDD and
ground pins to provide power for the IC. Pin 3 is
the base drive for the NPN transistor. Pin 1 is the
switching pin. Pin 5 is the feedback pin that
senses the output current and output voltage. Pin
6 is the peak current sense pin. Resistance of
R10 determines the output DC cord compensa-
tion percentage.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, DSCs, and Other Portable Devices and Ap-
pliances.
Key Component Selection
The maximum output current is decided by for-
mula(1).
Lp is the transformer inductance value, Rcs is the
current sense resistor, which is shown as R9 in
the schematic. Fsw is the switching frequency,
which design value is 75kHz. is the overall sys-
tem efficiency, which value is approximately
equal to 70%. Voutcc is the output voltage, which
setting is through the flyback voltage of auxiliary
winding and the feedback resistor R5, R6 as
shown in formula (2).
Np/Ns/Naux (147/9/24) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 700mA are used to do the
design. Ns and Naux are number of turns of sec-
ondary and auxiliary of the transformer. VSEC_R
is the forward voltage drop of the output rectifier
diode at approximately 0.1A bias. The peak cur-
rent limit is set by (0.396×0.9)/Rcs
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT334 30mW 5V 3.5W EPC13 Flyback
Figure 1:
Schematic of Charger
L=41.3mm
W=28.1mm
H=13.2mm
(1)
(2)
-13-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT334 5V/700MA CHARGER
Bill of Materials
REF DESCRIPTION MFTR
C1, C2 Capacitor, Electrolytic, 4.7µF/400V, 8 × 12mm KSC
C3 Capacitor, Ceramic,220pF/500V,1206,SMD POE
C4 Capacitor, Ceramic,, 4.7µF/35V, 1206, SMD POE
C5,C6 Capacitor, Electrolytic, 220µF/10V, 6.3 × 8mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
D1-D5 Diode,Rectifier,1000V/1A,1N4007, DO-41 Good-Ark
D6 Diode, Ultra Fast, FR107,1000V/1.0A, DO-41 Good-Ark
D8 Diode, Schottky, 40V/3A, SB340, SMA Good-Ark
L1 Axial Inductor, 1.5mH, 0410, DIP Amode Tech
Q1 Transistor, NPN, 700V,1.5A, D13003, TO-251AB Huawei
FR1 Fusible Resistor, 1W, 10, 5% TY-OHM
R1,R4 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 1.0M, 1206, 5% TY-OHM
R3 Chip Resistor, 470, 1206, 5% TY-OHM
R5 Chip Resistor, 43.4K, 0805, 1% TY-OHM
R6 Chip Resistor, 8.25K, 0805, 1% TY-OHM
R7,R8 Chip Resistor, 15M, 1206, 5% TY-OHM
R9 Chip Resistor, 1.0, 1206, 1% TY-OHM
R10 Chip Resistor, 80.6K, 0805, 5% TY-OHM
R11 Chip Resistor, 3.9K, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
T1 Transformer, LP = 1.5mH±7%, EPC13 5+5pin
U1 IC, ACT334US-T, SOT23-6 Active-Semi
PCB1 PCB, L*W*T=41.3x28.1x1.6mm,Cem-1,Rev:A Jintong
Transformer Specitication
Build up
Note:1.SH1,SH2 are shielding; P1 & P2 are primary and S1 is
secondary.(Bobbin:EPC13)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 1 and 4 at
1Vac & 1kHz 1.5mH±7%
3 P1 Leakage
Inductance Inductance between pins 1 and 4 with
pins 2-3 and 6-10 shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
CC/CV CURVE
EVALUATION KITS Vin Vo Io
ACT334-01 85-264Vac 4.75-5.25V 700-900mA
Wind-
ing
Terminal Turns Wire Insulation
Start Fin-
ish Type Size*QTY Layer Thick/Wide Lay
er
P1
4 --> 49 2UEW 0.12*1 1 0.025*8.5W
<-- <-- 49 2UEW 0.12*1 1 0.025*8.5W
--> 1 49 2UEW 0.12*1 1 0.025*8.5W
SH1 2 NC 49 2UEW 0.12*1 1 0.025*8.5W
P2 2 3 24 2UEW 0.12*1 1 0.025*8.5W 1
S1 10 6 9 TEX-E 0.40*1 1 0.025*8.5W 2
SH2 2 Core 1 3
-14-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT334 5V/1000MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT334 to provide output power of
5V1000mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(D1,D2,D3,D4,C1, L1, C2),power drive circuit
(BD pin, Q1), secondary rectified circuit (D8,
C5,C6) and the IC control circuit. ACT334 is a
Primary Side Regulator (PSR) so that the power
supply unit can regulate current and voltage with-
out Opto-coupler. Pin 4 and Pin 2 are the VDD
and ground pins to provide power for the IC. Pin
3 is the base drive for the NPN transistor. Pin 1 is
the switching pin. Pin 5 is the feedback pin that
senses the output current and output voltage. Pin
6 is the peak current sense pin. Resistance of
R10 determines the output DC cord compensa-
tion percentage.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, DSCs, and Other Portable Devices and Ap-
pliances.
Key Component Selection
The maximum output current is decided by for-
mula(1).
Lp is the transformer inductance value, Rcs is the
current sense resistor, which is shown as R9 in
the schematic. Fsw is the switching frequency,
which design value is 75kHz. is the overall
system efficiency, which value is approximately
equal to 70%. Voutcc is the output voltage, which
setting is through the flyback voltage of auxiliary
winding and the feedback resistor R5, R6 as
shown in formula (2).
Np/Ns/Naux (147/9/24) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 1000mA are used to do the
design. Ns and Naux are number of turns of sec-
ondary and auxiliary of the transformer. VSEC_R
is the forward voltage drop of the output rectifier
diode at approximately 0.1A bias. The peak cur-
rent limit is set by (0.396×0.9)/Rcs
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT334 30mW 5V 5W EPC13 Flyback
Figure 1:
Schematic of Charger
L=41.3mm
W=28.1mm
H=13.2mm
(1)
(2)
-15-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT334 5V/1000MA CHARGER
Bill of Materials
REF DESCRIPTION MFTR
C1, C2 Capacitor, Electrolytic, 6.8µF/400V, 8 × 12mm KSC
C3 Capacitor, Ceramic,220pF/500V,1206,SMD POE
C4 Capacitor, Ceramic,, 4.7µF/35V, 1206, SMD POE
C5,C6 Capacitor, Electrolytic, 330µF/10V, 6.3 × 8mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
D1-D5 Diode,Rectifier,1000V/1A,1N4007, DO-41 Good-Ark
D6 Fast Recovery Rectifier,RS1D,200V/1.0A,SMA Good-Ark
D8 Diode, Schottky, 40V/3A, SB340, SMA Good-Ark
L1 Axial Inductor, 1.5mH, 0410, DIP Amode Tech
Q1 Transistor, NPN, 700V,1.5A, D13003, TO-251AB Huawei
FR1 Fusible Resistor, 1W, 10, 5% TY-OHM
R1,R4 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 1.0M, 1206, 5% TY-OHM
R3 Chip Resistor, 470, 1206, 5% TY-OHM
R5 Chip Resistor, 60.4k, 0805, 1% TY-OHM
R6 Chip Resistor, 11.3k, 0805, 1% TY-OHM
R7,R8 Chip Resistor, 15M, 1206, 5% TY-OHM
R9 Chip Resistor, 1.0, 1206, 1% TY-OHM
R10 Chip Resistor, 80.6k, 0805, 5% TY-OHM
R11 Chip Resistor, 3.9k, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
T1 Transformer, LP = 1.55mH±7%, EPC13 5+5pin
U1 IC, ACT334US-T, SOT23-6 Active-Semi
PCB1 PCB, L*W*T=41.3x28.1x1.6mm,Cem-1,Rev:A Jintong
Transformer Specitication
Build up
Note:1.SH1,SH2 are shielding; P1 & P2 are primary and S1 is
secondary.(Bobbin:EPC13)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 1 and 4 at
1Vac & 1kHz 1.55mH±7%
3 P1 Leakage
Inductance Inductance between pins 1 and 4 with
pins 2-3 and 6-10 shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
CC/CV CURVE
EVALUATION KITS Vin Vo Io
ACT334-02 85-264Vac 4.75-5.25V 1000-1200mA
66.00%
68.00%
70.00%
72.00%
110 135 160 185 210 235
Efficiency
Vin
AverageEfficiencyVsVin
EfficiencyVsVin
115V,230"
Wind-
ing
Terminal Turns Wire Insulation
Start Fin-
ish Type Size*QTY Layer Thick/Wide Lay
er
P1
4 --> 49 2UEW 0.12*1 1 0.025*8.5W
<-- <-- 49 2UEW 0.12*1 1 0.025*8.5W
--> 1 49 2UEW 0.12*1 1 0.025*8.5W
SH1 2 NC 49 2UEW 0.12*1 1 0.025*8.5W
P2 2 3 24 2UEW 0.12*1 1 0.025*8.5W 1
S1 10 6 9 TEX-E 0.40*1 1 0.025*8.5W 2
SH2 2 Core 1 3
-16-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT336 5V/1200MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT336 to provide output power of
5V1200mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(BD1,C1, L2,C2),power drive circuit (BD pin, Q1),
secondary rectified circuit (D8, C5,C6) and the IC
control circuit. ACT336 is a Primary Side Regula-
tor (PSR) so that the power supply unit can regu-
late current and voltage without Opto-coupler.
Pin 6 and Pin 2,4,7 are the VDD and ground pins
to provide power for the IC. Pin 8 is the base
drive for the NPN transistor. Pin 1 is the switch-
ing pin. Pin 5 is the feedback pin that senses the
output current and output voltage. Pin 3 is the
peak current sense pin. Resistance of R10 deter-
mines the output DC cord compensation percent-
age.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, Shaver, DSCs, and Other Portable Devices
and Appliances.
Key Component Selection
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT336 30mW 5V 7W EFD15 Flyback
Figure 1:
Schematic of Charger
The maximum output current is decided by for-
mula (1).
Lp is the transformer inductance value, Rcs is
the current sense resistor, which is shown as
R9 in the schematic. Fsw is the switching fre-
quency, which design value is 75kHz. is the
overall system efficiency, which value is ap-
proximately equal to 70%. Voutcc is the output
voltage, which setting is through the flyback
voltage of auxiliary winding and the feedback
resistor R5, R6 as shown in formula (2).
Np/Ns/Naux (140/8/23) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 1200mA are used to do the
design. Ns and Naux are number of turns of
secondary and auxiliary of the transformer.
VSEC_R is the forward voltage drop of the out-
put rectifier diode at approximately 0.1A bias.
The peak current limit is set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
L=26.4mm
W=24.4mm
H=26.0mm
(1)
(2)
-17-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT336 5V/2100MA CHARGER
Bill of Materials
Transformer Specitication
Build up
Note:1.SH1 and SH2 are shielding; P1 ,P2 and P3 are primary
and S1 is secondary.(Bo bbi n: EFD15)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 2 and 4 at
1Vac & 1kHz 1.53mH±7%
3 P1 Leakage
Inductance Inductance between pins 1 and 3 with
pins 2-4 and A-B shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
EVALUATION KITS Vin Vo Io
ACT336-01 85-264Vac 4.75-5.25V >1200mA
REF DESCRIPTION MFTR
C1,C2 Capacitor, Electrolytic, 6.8µF/400V, 8x12mm Koshin
C3 Capacitor, Ceramic,220pF/500V,0805,SMD POE
C4 Capacitor, Ceramic,4.7µF/35V,0805,SMD POE
C5,C6 Capacitor, Electrolytic, 330µF/10V, 8x12mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
BD1 Bridge,B6S,600V/0.5A,MDI,SMD PANJIT
D5,D6 Diode,Ultra Fast, FR107,1000V/1.0A,DO-41 Good-Ark
D8 Diode, schottky, 40V/5A, SK54, SMC PANJIT
L1 Axial Inductor, 1.5mH,0410,Dip Amode Tech
Q1 Transistor, HFE 20-25, NPN,D13003X,TO-251 Huawei
PCB1 PCB, L*W*T=26.4x24.4x0.8mm,Cem-1,Rev:A Jintong
FR1 Wire Round Resistor,1W,10 ohm,KNP, 5% TY-OHM
R1 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 1M, 0805, 5% TY-OHM
R3 Chip Resistor, 330, 0805, 5% TY-OHM
R4 Chip Resistor, 22, 0805, 5% TY-OHM
R5 Chip Resistor, 65k, 0805,1% TY-OHM
R6 Chip Resistor, 11.3k, 0805,1% TY-OHM
R7,R8 Chip Resistor, 15M, 1206, 5% TY-OHM
R9 Chip Resistor, 0.91, 1206,1% TY-OHM
R10 Chip Resistor, 162k, 0805, 5% TY-OHM
R11 Chip Resistor, 3.6k, 0805, 5% TY-OHM
R13 Chip Resistor, 10 ohm, 0805, 5% TY-OHM
T1 Transformer, Lp=1.53mH, EFD15
U1 IC, ACT336SH,SOP-8 Active-Semi.
Winding
Terminal
Turns
Wire Insulation
Start Finish Type Size*QTY Layer Thick/Wide Layer
P2 3 1 23 2UEW 0.12*2 1 0.025*8.5W 2
P1
4 --> 47 2UEW 0.15*1 1 0.025*8.5W
2 <-- <-- 47 2UEW 0.15*1 1 0.025*8.5W
--> 2 46 2UEW 0.15*1 1 0.025*8.5W
SH1 1 NC 17 2UEW 0.12*3 1 0.025*8.5W 2
S1 A B 8 TEX-E 0.30*2 1 0.025*8.5W 2
SH2 NC 1 21 2UEW 0.12*3 1 0.025*8.5W 2
S1
B
P2
3
1
P1
2
4
A
NC NC
Reverse
68.00%
70.00%
72.00%
74.00%
110 135 160 185 210 235
Efficiency
Vin
AverageEfficiencyVsVin
EfficiencyVsVin
115V,230"
-18-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT337 5V/1500MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT337 to provide output power of
5V/1500mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(BD1,C1, L2,C2),power drive circuit (BD pin, Q1),
secondary rectified circuit (D8, C5,C6) and the IC
control circuit. ACT337 is a Primary Side Regula-
tor (PSR) so that the power supply unit can regu-
late current and voltage without Opto-coupler.
Pin 6 and Pin 2,4,7 are the VDD and ground pins
to provide power for the IC. Pin 8 is the base
drive for the NPN transistor. Pin 1 is the switch-
ing pin. Pin 5 is the feedback pin that senses the
output current and output voltage. Pin 3 is the
peak current sense pin. Resistance of R10 deter-
mines the output DC cord compensation percent-
age.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, Shaver, DSCs, and Other Portable Devices
and Appliances.
Key Component Selection
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT337 30mW 5V 7.5W EE16 Flyback
Figure 1:
Schematic of Charger
The maximum output current is decided by for-
mula (1).
Lp is the transformer inductance value, Rcs is
the current sense resistor, which is shown as
R9 in the schematic. Fsw is the switching fre-
quency, which design value is 75kHz. is the
overall system efficiency,which value is approxi-
mately equal to 70%. Voutcc is the output volt-
age, which setting is through the flyback voltage
of auxiliary winding and the feedback resistor
R5, R6 as shown in formula (2).
Np/Ns/Naux (110/8/18) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 1500mA are used to do the
design. Ns and Naux are number of turns of
secondary and auxiliary of the transformer.
VSEC_R is the forward voltage drop of the out-
put rectifier diode at approximately 0.1A bias.
The peak current limit is set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
L=50.6mm
W=26.2mm
H=20.9mm
(1)
(2)
-19-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT337 5V/1500MA CHARGER
Bill of Materials
Transformer Specitication
Build up
Wind
ing
Terminal Turns Wire Insulation
Start Finish Type Size*QTY Layer Thick/Wide Laye
r
P1 2 3 74 2UEW 0.22*1 1 0.025*8.5W 2
SH1 --> 4 0.9 Copper 0.7mm 1 0.025*8.5W 2
S1 B A 8 TEX-E 0.75*1 1 0.025*8.5W 2
P2 5 4 18 2UEW 0.14¢*3 1 0.025*8.5W 2
P3 3 1 36 2UEW 0.22¢*1 1 0.025*8.5W 2
SH2 4 core 3 Copper
wire 0.15*1 1 0.025*8.5W 8
Note:1.SH1 and SH2 are shielding; P1 ,P2 and P3 are primary
and S1 is secondary.(Bobbin:EE16)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 2 and 3 at
1Vac & 1kHz 1.15mH±7%
3 P1 Leakage
Inductance Inductance between pins 2 and 3 with
pins 4-5 and 6-10 shorted 75µH
PCB Top Layer
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
EVALUATION KITS Vin Vo Io
ACT337-01 85-264Vac 4.75-5.25V 1500-1800mA
REF DESCRIPTION MFTR
C1 Capacitor, Electrolytic, 6.8µF/400V, 8×14mm Koshin
C2 Capacitor, Electrolytic, 10µF/400V,10×14mm Koshin
C3 Capacitor, Ceramic,220pF/500V,1206,SMD POE
C4 Capacitor, Electrolytic, 10µF/35V,5x11mm KSC
C5,C6 Capacitor, Electrolytic,680µF/10V, 8 ×16mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
BD1 Bridge Rectifier,MB6S,600V/1.0A,SDIP PANJIT
D5 Fast Recovery Rectifier, FR107,1000V/1.0A, DIP PANJIT
D6 Fast Recovery Rectifier,RS1D,200V/1.0A,SMA PANJIT
D8 Diode, Schottky, 40V/5A, SS54, SMC Diodes
L1 Choke Coil, 1.5mH, ¢6x8mm, DIP Amode Tech
Q1 Transistor, NPN, 700V,D13005,TO-220 Huawei
FR1 Fusible Resistor, 1W, 10, 5% TY-OHM
R1 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 1M,1206, 5% TY-OHM
R3 Chip Resistor, 300,1206, 5% TY-OHM
R4 Chip Resistor, 15, 0805, 5% TY-OHM
R5 Chip Resistor, 66.7k, 0805, 1% TY-OHM
R6 Chip Resistor,12.4k, 0805, 1% TY-OHM
R7,R8 Chip Resistor, 15M, 1206, 5% TY-OHM
R9 Chip Resistor, 0.708,1206, 1% TY-OHM
R10 Chip Resistor, 80k, 0805, 5% TY-OHM
R11 Chip Resistor, 3.6k, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
T1 Transformer, LP = 1.15mH±7%, EE16
USB Double-layer USB Rev:A
U1 IC, ACT337SH-T,SOP-8 Active-Semi
PCB1 PCB, L*W*T=50x26x1.6mm,Cem-1,Rev:A Jintong
CC/CV CURVE
PCB Bottom Layer
-20-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT337 5V/2100MA CHARGER
Operation and Application
Figure 1 is the schematic of an offline charger
using ACT337 to provide output power of
5V2100mA. This circuit is a typical flyback power
supply which includes the AC rectified circuit
(BD1,C1, L2,C2),power drive circuit (BD pin, Q1),
secondary rectified circuit (D8, C5,C6) and the IC
control circuit. ACT337 is a Primary Side Regula-
tor (PSR) so that the power supply unit can regu-
late current and voltage without Opto-coupler.
Pin 6 and Pin 2,4,7 are the VDD and ground pins
to provide power for the IC. Pin 8 is the base
drive for the NPN transistor. Pin 1 is the switch-
ing pin. Pin 5 is the feedback pin that senses the
output current and output voltage. Pin 3 is the
peak current sense pin. Resistance of R10 deter-
mines the output DC cord compensation percent-
age.
This circuit can be used as universal charger for
Cell Phones, PDAs, MP3,Portable Media Play-
ers, Shaver, DSCs, and Other Portable Devices
and Appliances.
Key Component Selection
Input Voltage Device Standby Power Output Voltage Power output Transformer Topology
85-264VAC ACT337 30mW 5V 10.5W EPC17 Flyback
Figure 1:
Schematic of Charger
The maximum output current is decided by for-
mula (1).
Lp is the transformer inductance value, Rcs is
the current sense resistor, which is shown as
R9 in the schematic. Fsw is the switching fre-
quency, which design value is 75kHz. is the
overall system efficiency, which value is ap-
proximately equal to 70%. Voutcc is the output
voltage, which setting is through the flyback
voltage of auxiliary winding and the feedback
resistor R5, R6 as shown in formula (2).
Np/Ns/Naux (110/8/18) must be designed cor-
rectly to ensure it operates in DCM in all condi-
tions. A design value Voutcc equal to 5V and
Ioutcc_min equal to 2100mA are used to do the
design. Ns and Naux are number of turns of
secondary and auxiliary of the transformer.
VSEC_R is the forward voltage drop of the out-
put rectifier diode at approximately 0.1A bias.
The peak current limit is set by (0.396×0.9)/Rcs.
)
VF
()
R396.0*9.0
(L
2
1
IOUTCC
SW
2
CS
POUTCC ×
×××=
η
R_SEC
AUX
S
6
5
REFOUTCC V
N
N
)
R
R
1(VV −×+×=
L=40.0mm
W=27.9mm
H=22.0mm
(1)
(2)
-21-
PSR
PSR
PSR
TM
A
ctive
High Efficiency AC/DC Primary Switching Solutions
ACT337 5V/2100MA CHARGER
Bill of Materials
Transformer Specitication
Build up
Wind-
ing
Terminal Turns Wire Insulation
Start Finish Type Size*QTY Layer Thick/Wide Lay
er
P1 2 3 74 2UEW 0.22*1 1 0.025*8.5W 2
SH1 --> 4 0.9 Copper 0.7mm 1 0.025*8.5W 2
S1 B A 8 TEX-E 0.75*1 1 0.025*8.5W 2
P2 5 4 18 2UEW 0.14¢*3 1 0.025*8.5W 2
P3 3 1 36 2UEW 0.22¢*1 1 0.025*8.5W 2
SH2 4 core 3 Copper
wire 0.15*1 1 0.025*8.5W 8
Note:1.SH1 and SH2 are shielding; P1 ,P2 and P3 are primary
and S1 is secondary.(Bo bbin:EPC17)
Electrical specifications
Item Description Condition Limits
1 Electrical
Strength 50Hz, 1 minute, from primary and
secondary 3000Vac
2 P1 Inductance Inductance between pins 2 and 3 at
1Vac & 1kHz 1.25mH±7%
3 P1 Leakage
Inductance Inductance between pins 2 and 3 with
pins 4-5 and 6-10 shorted 75µH
PCB Top and Bottom Layers
Typical Performance Characteristics
STANDBY POWER
EFFICIENCY
EVALUATION KITS Vin Vo Io
ACT365-02 85-264Vac 4.75-5.25V >2200mA
REF DESCRIPTION MFTR
C1, C2 Capacitor, Electrolytic, 10µF/400V, 10×16mm KSC
C3 Capacitor, Ceramic,220pF/500V,1206,SMD POE
C4 Capacitor, Ceramic, 10µF/35V,1206,SMD KSC
C5 Capacitor, Electrolytic, 1000µF/6.3V, 8 ×16mm KSC
C6 Capacitor, Electrolytic, 820µF/6.3V, 6.3 × 16mm KSC
C9 Capacitor, Ceramic,1000pF/50V,0805,SMD POE
CY1 Safety Y1,Capacitor,1000pF/400V,Dip UXT
BD1 Bridge Rectifier,D1010S,1000V/1.0A,SDIP PANJIT
D5 Fast Recovery Rectifier, RS1M,1000V/1.0A, RMA PANJIT
D6 Fast Recovery Rectifier,RS1D,200V/1.0A,SMA PANJIT
D8 Diode, Schottky, 45V/10A, S10U45S, SMD Diodes
L1 Choke Coil, 1.5mH, ¢6x8mm, DIP Amode Tech
Q1 Transistor, NPN, 700V,D13005,TO-126 Huawei
F1 Fuse:1A 250V 3.6*10mm With Pigtail, ceramic tube walter
R1 Chip Resistor, 22, 0805, 5% TY-OHM
R2 Chip Resistor, 1M,1206, 5% TY-OHM
R3 Chip Resistor, 390,1206, 5% TY-OHM
R4 Chip Resistor, 15, 0805, 5% TY-OHM
R5 Chip Resistor, 80.6k, 0805, 1% TY-OHM
R6 Chip Resistor,18.2k,0805, 1% TY-OHM
R7 Chip Resistor, 30M, 1206, 5% TY-OHM
R9 Chip Resistor, 0.62,1206, 1% TY-OHM
R10 Chip Resistor, 162k, 0805, 5% TY-OHM
R11 Chip Resistor, 3k, 0805, 5% TY-OHM
R13 Chip Resistor, 10, 0805, 5% TY-OHM
T1 Transformer, LP = 1.25mH±7%, EPC17
USB Double-layer USB Rev:A
U1 IC, ACT337SH-T,SOP-8 Active-Semi
S/H1 AL HeatSink, LxWxH=7.5x17x2.0mm
PCB1 PCB, L*W*T=40x27.9x1.6mm,Cem-1,Rev:A Jintong
SH1 P3
