G1552 Switch Datasheet

G1552 Datasheet, PDF, Equivalent


Part Number

G1552

Description

High Performance Current Mode PWM Switch

Manufacture

Global Semiconductor

Total Page 10 Pages
Datasheet
Download G1552 Datasheet


G1552
G1552
High Performance Current Mode PWM Switch
ANALOG PWM IC
1. General Description
The G1552 is a high performance AC/DC power
supply Switch for battery charger and adapter
applications requirements up to 8W in an open
frame design.It can meet less than 80 mW
standby power.
G1552 is a current mode PWM Switch with a high
voltage power MOSFET. It operates in fixed
frequency which is precisely set internally. It
could operate in Extended Burst Mode at no load
or light load, in which mode switching loss is
minimized and the frequency is adjusted
internally. To ensure that power supplies work
quietly, the frequency is set beyond 20 KHz.
Small current is needed when G1552 starts up
and works, thus a large value resistor could be
used in the startup circuit to minimize the standby
power. Slope compensation circuit is integrated
in G1552, which improves system large signal
stability and reduces the possible sub-harmonic
oscillation at high PWM duty cycle.
Frequency shuffling technique is integrated in
G1552, which helps to achieve excellent EMI
performance.
G1552 offers complete protection functions
including cycle-by-cycle current limiting
protection(OCP), over load protection(OLP),VDD
over voltage protection(OVP), VDD over voltage
clamp and under voltage lockout(UVLO).
The G1552 is available in SOP7 and DIP8
package.
Features
Built-in Soft Start
Random Frequency Adjustment to
Reduce System EMI
Audio Noise Free Operation
Internal Cable Compensation
Extended Burst Mode Control For
Improved Efficiency and Minimum
Standby Power Design
Internal Synchronized Slope
Compensation
Low VDD Startup Current and Low
Operating Current
Leading Edge Blanking on Current
Sense Input
Over Load Protection(OLP) and
Cycle-by-Cycle Current Limiting
Protection(OCP)
Over Voltage Protection (OVP),
Under Voltage Lockout Protection
(UVLO) and Over Voltage Clamp
Applications
Offline AC/DC flyback converter
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
Auxiliary Power Supply for PC and
Server
Digital Cameras and Camcorder
Adapter
Global Semiconductor Co., LTD.
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G1552
G1552
High Performance Current Mode PWM Switch
2. Products Information
2.1 Pin configuration
Pin Configuration: G1552 Series
Pin Name
VDD
VDD_G
NC
FB
CS
DRAIN
GND
I/O Description
P Power Supply
P Internal Driver Power Supply. The VDD_G pin is
connected to the VDD pin with zero resistance.
- Unconnected Pin
I Feed Back Input Pin
I Current Sense Input Pin
O HV MOSFET Drain Pin. The Drain pin is
connected to the primary lead of the transformer.
P Ground
Rev. 2.1
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Features G1552 High Performance Current Mode PWM Switch ANALOG PWM IC 1. General Descr iption The G1552 is a high performance AC/DC power supply Switch for battery c harger and adapter applications require ments up to 8W in an open frame design. It can meet less than 80 mW standby pow er. G1552 is a current mode PWM Switch with a high voltage power MOSFET. It op erates in fixed frequency which is prec isely set internally. It could operate in Extended Burst Mode at no load or li ght load, in which mode switching loss is minimized and the frequency is adjus ted internally. To ensure that power su pplies work quietly, the frequency is s et beyond 20 KHz. Small current is need ed when G1552 starts up and works, thus a large value resistor could be used i n the startup circuit to minimize the s tandby power. Slope compensation circui t is integrated in G1552, which improve s system large signal stability and red uces the possible sub-harmonic oscillat ion at high PWM duty cycle. Frequency shuffling technique is in.
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