G1138 Datasheet PDF | Global Semiconductor





G1138 Datasheet PDF Download

Part Number G1138
Description ANALOG PWM IC
Manufacture Global Semiconductor
Total Page 4 Pages
PDF Download Download G1138 Datasheet PDF

Features: G1138 High Precision CC/CV Primary-Side PWM Power Switch 1. General Descriptio n G1138 is a high performance offline P WM Power switch for low power AC/DC cha rger and adaptor applications up to 16W .It operates in primary-side regulation . Consequently, opto-coupler and tl431 could be eliminated. Proprietary Consta nt Voltage (CV) and Constant Current (C C) control is integrated as shown In th e Fig.1. In CC control,the current and output power setting can be adjusted ex ternally by the sense resistor RS at CS pin. In CV control, multi-mode operati ons are utilized to achieve high perfor mance and high efficiency. In addition, good load regulation is achieved by th e built-in cable drop compensation. Dev ice operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at lig ht/medium load. G1138 offers power on s oft start control and protection covera ge with auto-recovery features includin g Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO..

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G1138 datasheet
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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