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UC2843BG

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

Unisonic Technologies 

UC2843B

 MARKING

DIP-8

876 5

UTC

UC3842B

1 23 4

Date Code

L: Lead Free

P: Halogen Free

Lot Code

 PIN CONFIGURATION

LINEAR INTEGRATED CIRCUIT

SOP-8

876 5

UTC

UC2843B

1234

Date Code

L: Lead Free

G: Halogen Free

Lot Code

COMP 1

VFB 2

ISENSE 3

RT/CT 4

8 VREF

7 VCC

6 OUTPUT

5 GND

 PIN DESCRIPTION

PIN NO.

1

2

3

4

5

6

7

8

PIN NAME

COMP

VFB

ISENSE

RT/CT

GND

OUTPUT

VCC

VREF

DESCRIPTION

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

This is the inverting input of the Error Amplifier. It is normally connected to the

switching power supply output through a resistor divider.

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

this information to terminate the output switch conduction.

The Oscillator frequency and maximum Output duty cycle are programmed by

connecting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is

possible.

This pin is the combined control circuitry and power ground.

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

sourced and sunk by this pin.

This pin is the positive supply of the control IC.

This is the reference output. It provides charging current for capacitor CT through

resistor RT.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

2 of 9

QW-R103-048.E

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