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G1132A
High Precision CC/CV Primary Side PWM Controller
ANALOG PWM IC
1. General Description
G1132A is a high performance offline PWM
Power switch for low power AC/DC charger and
adaptor applications.
It operates in primary-side sensing and
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.
G1132A 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.
Features
5% Constant Voltage Regulation, 5%
Constant Current Regulation at
Universal AC input
Primary-side Sensing and Regulation
Without TL431 and Opto-coupler
Built-in High-Voltage Power MOS
Power on Soft-start
Internal Cable Compensation
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
VDD Under Voltage Lockout with
Hysteresis (UVLO)
Programmable CV and CC Regulation
Adjustable Constant Current and Output
Power Setting
Built-in Secondary Constant Current
Control with Primary Side Feedback
Built-in adaptive current peak regulation
Built-in Primary winding inductance
compensation
Program cable drop compensation
VDD OVP and VDD Clamp
5000V HBM ESD
Pb-free SOP-8L
Applications
Cell Phone /Digital Cameras Charger
Small Power Adaptor
Auxiliary Power for PC, TV etc
Linear Regulator/RCC Replacement
Fig.1. Typical CC/CV Curve
Global Semiconductor Co., LTD.
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G1132A
High Precision CC/CV Primary Side PWM Controller
2. Products Information
2.1 Pin configuration
VDD
COMP
INV
CS
GND
GND
DRAIN
DRAIN
Pin Configuration: G1132A
Pin Name
VDD
COMP
INV
CS
DRAIN
GND
I/O Description
P Power Supply
I Loop Compensation for CV Stability
The Voltage feedback from auxiliary winding.
Connected to resistor divider from auxiliary
I winding reflecting output voltage. PWM duty
cycle is determined by EA output and current
sense signal at pin 3
I Current sense input. Connected to MOSFET
current sensing resistor node
O HV MOSFET Drain Pin. The Drain pin is
connected to the primary
lead of the transformer
P Ground
Rev. 1.1
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G1132A
High Precision CC/CV Primary Side PWM Controller
2.2 Block diagram
2 .3 Output Power Table
Product
G1132A
90~265VAC
Adapter1
5W
Notes:1.Maximum practical continuous power in an Adapter design with sufficient drain pattern as a
heat sink, at 50ambient. Higher output power is possible with extra added heat sink or air
circulation to reduce thermal resistance.
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G1132A
High Precision CC/CV Primary Side PWM Controller
3. Absolute Maximum Ratings
Description
VDD Voltage
HV MOSFET Drain Voltage
VDD Zener Clamp Continuous Current
COMP Voltage
CS Input Voltage
INV Input Voltage
HBM ESD
MM ESD
Min/Max Operating Junction Temperature
TJ
Min/Max Storage Temperature Tstg
Lead Temperature (Soldering, 10secs)
Operating Junction Temperature Range
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
3000V
500V
-20 to 150
-55 to 150
220
-55 to + 150
Note: 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
Rev. 1.1
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G1132A
High Precision CC/CV Primary Side PWM Controller
4. Typical Application
5. Electrical Characteristics
(TA = 25, VDD=16V, unless otherwise noted)
Symbol
Supply Voltage
Parameter
Test Conditions
IDD_ST
Standby current
VDD=13V
IDD_OP
Operation Current
UVLO(ON)
VDD Under Voltage
Lockout Enter
UVLO(OFF)
VDD Under Voltage
Lockout Exit
OVP
Over voltage protection
voltage
V_clamp
Maximum VDD operation
voltage
Current Sense
INV=2V,CS=0V,
VDD =20V
VDD falling
VDD rising
Ramp up VDD until
gate clock is off
IDD=10mA
TLEB
LEB time
Vth_oc
Over current threshold
Td_oc
OCP Propagation delay
ZSENSE_IN Input Impedance
T_ss
CV Section
Freq_Nom
Freq_startup
Soft start time
System Nominal switch
frequency
INV=0V,Comp=5V
f/Freq
Frequency jitter range
Error Amplifier Section
Min Typ Max Unit
5 10
2.5 3.5
7.5 8.5 10
13.5 14.5 16.0
27.5 29.5 31
30.5 32.5 34.5
uA
mA
V
V
V
V
540
880 910 940
150
50
10
ns
mV
nS
K
mS
60 KHz
14 KHz
+/-4 %
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