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AIC3842 Datasheet(PDF) 5 Page - Analog Intergrations Corporation

Part # AIC3842
Description  Current-Mode PWM Controller
Download  7 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC3842 Datasheet(HTML) 5 Page - Analog Intergrations Corporation

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AIC3842
5
n BLOCK DIAGRAM
8
6
R
S
VCC
GND
VREF
5V/50mA
COMP
OUTPUT
VFB
ISENSE
RT/CT
VREF
Good
Logic
UVLO
PWM
Latch
OSC
ZD
34V
Current
Sense
comparator
Internal Bias
Error Amp.
D1
Z1
1V
D2
R2
2.50V
S/R
5V
REF
Q2
Q1
7
5
4
1
2
3
n PIN DESCRIPTIONS
PIN 1: COMP
- This pin is the error amplifier
output and is made available for
loop compensation.
PIN 2:
VFB
- This is the inverting input of the
error amplifier. It is normally
connected
to
the
switching
power supply output through a
resistor divider.
PIN 3:
ISENSE - A
voltage
proportional
to
inductor current is connected to
this input. The PWM uses this
information
to
terminate
the
output switch conduction.
PIN 4:
RT/CT
- The
oscillator
frequency
and
maximum output duty cycle are
programmed
by
connecting
resistor RT to VREF and capacitor
CT to ground. Operation to
500KHz is feasible.
PIN 5:
GND-
This pin is the combined control
circuitry and power ground.
PIN 6:
OUTPUT- This output directly drives the
gate of a power MOSFET. Peak
currents up to 1A are sourced
and sunk by this pin.
PIN 7:
VCC -
This pin is the positive supply of
the control IC.
PIN 8:
VREF -
This is the reference output. It
provides
charging
current
for
capacitor CT through resistor RT.


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