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G1138
High Precision CC/CV Primary-Side PWM Power Switch
1. General Description
G1138 is a high performance offline PWM Power
switch for low power AC/DC charger and adaptor
applications up to 16W.It operates in primary-side
regulation. Consequently, opto-coupler and tl431
could be eliminated.
Proprietary Constant Voltage (CV) and Constant
Current (CC) control is integrated as shown In
the Fig.1. In CC control,the current and output
power setting can be adjusted externally by the
sense resistor RS at CS pin. In CV control,
multi-mode operations are utilized to achieve
high performance and high efficiency.
In addition, good load regulation is achieved by
the built-in cable drop compensation. Device
operates in PFM in CC mode as well at large load
condition and it operates in PWM with frequency
reduction at light/medium load.
G1138 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, VDD
OVP, VDD clamp and UVLO. Excellent EMI
performance is achieved with frequency jitter
technique.
Fig.1. Typical CC/CV Curve
ANALOG PWM IC
Features
5% CV and CC Regulation at Universal
AC input
Primary-side Regulation Without TL431
and Opto-coupler
Built-in High-Voltage Power MOS
Programmable CV and CC Regulation
Adjustable Constant Current and Output
Power Setting
Built-in Secondary Constant Current
Control with Primary Side Feedback
Built-in Primary winding inductance
compensation
Programmable cable drop compensation
Built-in Leading Edge Blanking (LEB)
Power on Soft-start
Built-in adaptive current peak regulation
Cycle-by-Cycle Current Limiting
VDD Under Voltage Lockout with
Hysteresis (UVLO)
VDD OVP and VDD Clamp
Pb-free DIP-7
Applications
Cell Phone Charger
Digital Cameras Charger
LED Driver
Small Power Adaptor
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
G1138 is offered in DIP-7 package.
Global Semiconductor Co., LTD.
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G1138
High Precision CC/CV Primary-Side PWM Power Switch
2. Products Information
2.1 Pin configuration
Fig.2. G1138 Pin Configuration ( DIP-7)
Pin Name
VDD
COMP
INV
CS
DRAIN
GND
I/O
P Power Supply
Description
I Loop Compensation for CV Stability
The Voltage feedback from auxiliary winding. Connected to
resistor divider from auxiliary winding reflecting output
I
voltage. PWM duty cycle is determined by EA output and
current sense signal at pin 4.
Current sense input. Connected to primary current sensing
I
resistor.
HV MOSFET Drain Pin. The Drain pin is connected to the
O
primary lead of the transformer
P Ground
2.2 Output Power Table
Product
85~264VAC
Adapter1
Notes:
G1138P
16W
1. Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at
50 ambient. Higher output power is possible with extra added heat sink or air circulation to reduce
thermal resistance.
Rev. 1.0
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G1138
High Precision CC/CV Primary-Side PWM Power Switch
2.3 Block diagram
Fig.3. G1138 Block Diagram
3. Absolute Maximum Ratings
Description
VDD Voltage
HV MOSFET Drain Voltage
VDD Zener Clamp Continuous Current
COMP Voltage
CS Input Voltage
INV Input Voltage
Max Operating Junction Temperature TJ
Min/Max Storage Temperature Tstg
Lead Temperature (Soldering, 10secs)
Package Dissipation Rating RθJA 2
Absolute Maximum Ratings
-0.3 to VDD_clamp
-0.3 to BVdss
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
150
-55 to 150
260
75 /W
Notes:
1. Stress beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
Exposure to absolute maximum-rated conditions for extended periods may affect device reliability
2. Drain Pin Connected to 100mm2 PCB copper clad.
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G1138
High Precision CC/CV Primary-Side PWM Power Switch
7. Package Information
DIP-7:
Symbol
A
A1
A2
B
B1
C
D
E
E1
e
L
E2
Dimension in Millimeters
Min Max
3.710
5.334
0.381
2.921
4.953
0.350
0.650
1.524(BSC)
0.200
0.360
9.000
10.160
6.096
7.112
7.320
8.255
2.540(BSC)
2.921
3.810
7.620
10.920
Dimensions in Inches
Min Max
0.146
0.210
0.015
0.115
0.195
0.014
0.026
0.06(BSC)
0.008
0.014
0.354
0.400
0.240
0.280
0.288
0.325
0.1(BSC)
0.115
0.150
0.300
0.430
Data and specifications subject to change without notice.
This product has been designed and qualified for Industrial Level and Lead-Free.
Qualification Standards can be found on GS's Web site.
Global Semiconductor HEADQUARTERS:
, , , , ,Scotia Centre 4th Floor P.O.Box 2804 George Town Grand Cayman KY1-1112
Cayman
Visit us at www.globalsemi-group.com for sales contact information.
Rev. 1.0
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