AX3842 datasheet(2/12 Pages) ETC

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AVANTICS - AX3842 Series

Specification No.: 050308-FE0008

Block Diagram

Pin Connection (Top View)

Package

Function

Description

Pin1: Compensation

This pin is the Error Amplifier output and is made available for

loop compensation.

Pin2: Voltage Feedback

This is the inverting input of the Error Amplifier. It’s normally

connected to the switching power supply output through a

resistor divider.

Pin3: Current Sense

A voltage proportional to inductor current is connected to this

input. The PWM uses this information to terminate the output

switch conduction.

Pin4: RT/CT

The oscillator frequency and maximum output duty cycle are

programmed by connecting resistor RT to Vref and cpacitor CT

to ground. Operation to 500kHz is possible.

Pin5: Ground

This pin is the combined control circuitry and power ground.

Pin6: Output

This output directly drives the gate of a power MOSFET. Peak

currents up to 1A are sourced and sunk by this pin.

Pin7: Vcc

This pin is the positive supply of the control IC.

DIP-8

SO-8

Pin8: Vref

This is the reference output. It provides charging current for

capacitor CT through resistor RT.

34V

Vcc

Ground

VFB

COMP

Current

Sense

Error AMP.

VREF Good

Logic

2.50V

Current

Sense

Comparator

UVLO

REF

Internal

Bias

PWM Latch

Output

VREF

5V 50mA

S/R

RT/CT

OSC

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