UC2843B

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 8

www.unisonic.com.tw

QW-R103-048.D

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PIN CONFIGURATION

8

7

6

5

1

2

3

4

COMP

VFB

OUTPUT

GND

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PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

COMP

This pin is the Error Amplifier output and is made available for loop compensation.

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.

3

A voltage proportional to inductor current is connected to this input. The PWM uses

this information to terminate the output switch conduction.

4

The Oscillator frequency and maximum Output duty cycle are programmed by

possible.

5

GND

This pin is the combined control circuitry and power ground.

6

OUTPUT

This output directly drives the gate of a power MOSFET. Peak currents up to 1.0A are

sourced and sunk by this pin.

7

This pin is the positive supply of the control IC.

8

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BLOCK DIAGRAM