AP3842C データシートの表示（PDF） - BCD Semiconductor

部品番号

コンポーネント説明

メーカー

AP3842C

CURRENT MODE PWM CONTROLLER

BCD Semiconductor 

CURRENT MODE PWM CONTROLLER

Pin Configuration

P/M Package

(DIP-8/SOIC-8)

COMP

VFB

ISENSE

RT/CT

1

8

2

7

3

6

4

5

VREF

VCC

OUTPUT

GND

Figure 2. Pin Configuration of AP3842C/3C/4C/5C (Top View)

Data Sheet

AP384XC

Pin Description

Pin Number

1

2

3

4

5

6

7

8

Pin Name

COMP

VFB

ISENSE

RT/CT

GND

OUTPUT

VCC

VREF

Function

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

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 con-

necting resistor RT to VREF and capacitor CT to ground. Operation to 500 kHz is possi-

ble.

The combined control circuitry and power ground.

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

sourced and sunk by this pin.

The positive supply of the control IC.

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

resistor RT.

Sep. 2006 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

2

Share Link: