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G1558
High Performance Current Mode PWM Switch
ANALOG PWM IC
1. General Description
The G1558 is a high performance AC/DC power
supply Switch for battery charger and adapter
applications requirements up to 31WIt can meet
less than 80 mW standby power.
G1558 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 G1558 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 G1558, which improves system large signal
stability and reduces the possible sub-harmonic
oscillation at high PWM duty cycle.
Frequency shuffling technique is integrated in
G1558, which helps to achieve excellent EMI
performance.
G1558 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 G1558 is available in DIP8 package.
Features
Built-in Soft Start
Random Frequency Adjustment to
Reduce System EMI
Audio Noise Free Operation
Short Circuit Protection
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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G1558
High Performance Current Mode PWM Switch
2. Products Information
2.1 Pin configuration
Pin Name
VDD
NC
FB
CS
DRAIN
GND
Pin Configuration: G1558 Series
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. 2.0
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G1558
High Performance Current Mode PWM Switch
2.2 Block diagram
2 .3 Output Power Table
Product
G1558
G1558-01
G1558-02
230VAC±15%
Adapter1
23W
23W
23W
90~265VAC
Adapter1
18W
18W
18W
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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G1558
High Performance Current Mode PWM Switch
3. Absolute Maximum Ratings
Description
Drain Voltage (off state)
VDD
Supply Current IVDD
FB Input Voltage
CS Input Voltage
RT Input Voltage
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature TSTG
Package Dissipation RθJA
Absolute Maximum Ratings
-0.3 to BVdss
40 V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-20 to 150
-55 to 160
75 /W
4. Typical Application
The G1558 series contains a Switch for a yback circuit.
Rev. 2.0
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G1558
High Performance Current Mode PWM Switch
5. Electrical Characteristics
(TA = 25, VDD=16V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage
IVDD_ST
VDD Start up Current
IOperate
VUVLO(off)
VUVLO(on)
VDD_CLAMP
VDD_OVP
Feedback
Operation Current
VDD Under Voltage Lockout
exit
VDD Under Voltage Lockout
enter
VDD clamp
VDD ovp
VDD=14V, Measure
Leakage current into VDD
VFB=3V
IDD=10mA
VFB_OPEN
DMAX
VFB Open Loop Voltage
Max duty cycle
VDD=14V,VFB=3V,VCS=0V
IFB_SHORT
VRef_burst_H
VRef_burst_L
VTH_PL
TD_PL
FB pin short circuit current
The threshold exit burst
mode
The threshold enter burst
mode
Power Limiting FB
Threshold
Power limiting Debounce
time
ZFB_IN
Input Impedance
Current Sense
SST
TLEB
Soft start time
Leading edge blanking
time
ZCS_IN
Input Impedance
VTH_OC
Internal Current Limiting
Oscillator
FOSC
Normal Oscillation
Frequency
ΔFOSC
ΔFTemp
Jitter frequency
Frequency Temperature
Stability
ΔF_VDD
Frequency Voltage Stability
FBURST
Burst Mode Base
Frequency
Mosfet Section
BVdss
MOSFET Drain-Source
Breakdown Voltage
Rdson
Static Drain to Source On
Resistance
VFB=3V,VCS=0V
VGS=0VID=250uA
VGS=10VID=2A
Min Typ Max Unit
3
1.6
14.5 15.5
10
2.5
16.5
8 9 10
30 31 32
27 28 29
uA
mA
V
V
V
V
4.5 5
V
65 72 80
%
0.3 mA
1.2 V
1.1 V
3.7 V
80 88 96 ms
16 K
6 ms
300 ns
40 K
0.75 V
60 65 70 KHz
-4 4 %
1%
1%
22 KHz
650 V
2.1 2.6
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