H3842S Просмотр технического описания (PDF) - Hi-Sincerity Microelectronics

Номер в каталоге

Компоненты Описание

производитель

H3842S

HIGH PERFORMANCE CURRENT MODE CONTROLERS

Hi-Sincerity Microelectronics 

HI-SINCERITY

MICROELECTRONICS CORP.

Spec. No. : HS200203

Issued Date : 2001.04.01

Revised Date : 2002.12.03

Page No. : 6/10

Application Information

Open Loop Test Circuit

Vref

4.7KΩ

RT

HPN2222A

100KΩ

Error Amp.

Adjust 1KΩ

I SENSE

Adjust 5KΩ

4.7KΩ

VREF

COMP

1

VFB

2

I SENSE

3

RT/CT

4

8

H3842

7 Vcc

Output

6

Ground

5

0.1uF

0.1uF

A

1W

1KΩ

Vcc

Output

Ground

CT

High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and

bypass capacitors should be connected close to pin5 in a single point ground. The transistor and 5KΩ

potentiometerare used to samplethe oscillator waveform and apply an adjustable ramp to pin3.

Oscillator and Output Waveforms

Vcc

8

RT

4

7

5V REG

PWM

1

3

2

Clock

Oscillator

Id

6

Output

CT

5

GND

CT

Output

CT

Output

Large RT / Small CT

Small RT / Large CT

Error Amp Configuration

Under Voltage Lockout

2.5V

+

Zi

VFB 2

-

COMP 1

Zf

7 ON/OFF Command

Icc

1mA

Vi

To Rest Of IC

<17mA

H3842

Von 16V

Voff 10V <0.5mA

Vcc

Voff Von

H3842S

HSMC Product Specification

Share Link: