PJ3844B 데이터 시트보기 (PDF) - Promax Johnton

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PJ3844B

High Performance Current Mode Controller

Promax Johnton 

PJ3844B / PJ3845B

High Performance Current Mode Controller

FIGURE 13-OUTPUT CROSS CONDUCTION

VOLTAGE

FIGURE 14-SUPPLY CURRENT versus SUPPLY

PIN FUNCTION DESCRIPTION

Pin No.

Function

1

Compensation

2

Voltage Feedback

3

Current Sense

4

RT/CT

5

Gnd

6

Output

7

Vcc

8

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 are programmed by

connecting resistor RT to Vref and capacitor CT to ground .Oscillator operation

to 1.0MHz is possible.

This pin is the combined control circuity and power ground (8-pin package

only).

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

1.0A are sourced and sunk by this pin.The output switchs at one-half the

oscillator frequency.

This pin is the positive supply of the control IC.

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

through resistor RT.

6-14

2004/11. Rev B

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