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GM3842AS8T Datasheet(PDF) 3 Page - Gamma Microelectronics Inc.

Part # GM3842AS8T
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Manufacturer  GAMMA [Gamma Microelectronics Inc.]
Direct Link  http://www.gammamicro.com.tw/
Logo GAMMA - Gamma Microelectronics Inc.

GM3842AS8T Datasheet(HTML) 3 Page - Gamma Microelectronics Inc.

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PACKAGE PIN DESCRIPTION
FUNCTION
FUNCTION
COMP
GND
VFB
Output
VREF
ISENSE
R/ C
T
T
This pin is Error Amplifier output and is made available for loop compensation.
This pin is the combined control circuitry and power ground.
This pin is the positive supply of the control integrated circuit (IC)
This is the inverting input of the Error Amplifier. It is normally connected to the
switching power supply output through a resistor divider.
This output directly drives the gate of a power MOSFET. Peak current up to 1.0A
are sourced and sunk by this pin.
This is the reference output. It provides charging current for capacitor CT
through resistor RT.
A voltage proportional to inductor current connected to this input. The PWM
uses this information to terminate the output switch conduction.
Oscillator frequency and maximum Output cycle are programmed by connecting
resistor
to V
and capacitor C to ground.
RT
REF
T
PIN lead
1
5
7
2
6
8
3
4
3
PARAMETER
SYMBOL
VALUE
UNIT
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (low impedance source)
Output Current, Source or Sink *
Input Voltage (analog inputs pins 2)
Maximum Power Dissipation (T = 25°C)
A
Error Amp Output Sink Current
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
30
±1.0
- 0.3 to + 5.5
10
V
A
°C
°C
V
CC
I
O
V
I
P
D
I
SINK(E.A)
T
stg
T
L
1.0
- 65 to + 150
260
W
mA
V
* Note: Maximum Package Power Dissipation Limits must be observed.
VCC


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