CS3865CGDW16 datasheet(1/8 Pages) CHERRY

No. de pieza	CS3865CGDW16

Descripción Electrónicos	High Performance Dual Channel Current Mode Controller with ENABLE

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Fabricante Electrónico	CHERRY [Cherry Semiconductor Corporation]

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1

Features

+

-

+

-

VREF

SYNC

Oscillator

Error

Amp 1

Error

Amp 2

Latching

PWM 2

Latching

PWM 1

VREF

Undervoltage

Lockout

5.0V Ref

VCC

Undervoltage

Lockout

VCC

VFB

1

COMP1

ENABLE2

VFB

2

COMP2

CT

RT

Gnd

Pwr Gnd

Sense2

VOUT

2

Sense1

VOUT

1

s

Oscillator has Precise

Duty Cycle

Limit and Frequency

Control

s

500kHz Current Mode

Operation

s

Automatic Feed Forward

Compensation

s

Separate Latching PWMs

for Cycle-By-Cycle

Current Limiting

s

Internally Trimmed

Reference with

Undervoltage Lockout

s

Switchable Second

Output

s

Two High Current Totem

Pole Outputs

s

Input Undervoltage

Lockout with Hysteresis

s

Low Start-Up and

Operating Current

Package Options

16L PDIP & SO Wide

High Performance Dual Channel

Current Mode Controller with ENABLE

1

SYNC

2

3

4

5

6

7

8

CT

RT

VFB

1

COMP1

Sense1

VOUT

1

Gnd

16

15

14

13

12

11

10

9

VCC

VREF

ENABLE2

VFB

2

COMP2

Sense2

VOUT

2

Pwr Gnd

CS3865C

Description

The CS3865C is a high perfor-

mance, fixed frequency, dual cur-

rent mode controller. It is used in

Off-Line and DC to DC converter

applications and require a mini-

mum number of external compo-

nents. This integrated circuit fea-

tures a unique oscillator for precise

duty cycle limit and frequency con-

trol, a temperature compensated

reference, two high gain error

amplifiers, two current sensing

comparators, and two high current

totem pole outputs ideally suited

for driving power MOSFETs. One

of the outputs VOUT

2 is switchable

via the ENABLE 2 pin.

Also included are protective fea-

tures consisting of input and refer-

ence undervoltage lockouts each

with hysteresis, cycle-by-cycle cur-

rent limiting, and a latch for single

pulse metering of each output.

The CS3865C has a 14V start volt-

age and is pin compatible with the

MC34065H.

Block Diagram

Rev. 12/16/96

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: (401)885-3600 Fax: (401)885-5786

Email: info@cherry-semi.com

Web Site: www.cherry-semi.com

A

Company

®

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