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G1555
High Performance Current Mode PWM Switch
ANALOG PWM IC
1.0 General Description
The G1555 is a high performance AC/DC power
supply Switch for battery charger and adapter
applications requirements up to 28W in an open
frame design.It can meet less than 80 mW
standby power.
G1555 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 G1555 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 G1555, which improves system large signal
stability and reduces the possible sub-harmonic
oscillation at high PWM duty cycle.
Frequency shuffling technique is integrated in
G1555, which helps to achieve excellent EMI
performance.
G1555 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 G1555 is available in 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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G1555
High Performance Current Mode PWM Switch
2.0 Products Information
2.1 Pin configuration
Pin Configuration: G1555 Series
Pin Name
VDD
NC
FB
CS
DRAIN
GND
I/O Description
P Power Supply
- 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. 1.0
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G1555
High Performance Current Mode PWM Switch
3.0 Package Information
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 Centre4th FloorP.O.Box 2804George TownGrand Cayman KY1-1112
Cayman
Visit us at www.globalsemi-group.com for sales contact information.
www.globalsemi-group.com
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