CS52843 datasheet(1/6 Pages) CHERRY

Part #	CS52843

Description	Current Mode PWM Control Circuit

PDF	6 Pages

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Manufacturer	CHERRY [Cherry Semiconductor Corporation]

Direct Link	http://www.cherrycorp.com/

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The CS52843 provides all the nec-

essary features to implement off-

line fixed frequency current-mode

control with a minimum number

of external components.

The CS52843 incorporates a new

precision temperature-controlled

oscillator to minimize variations in

frequency. An undervoltage lock-

out ensures that VREF is stabilized

before the output stage is enabled.

In the CS52843 turn on is at 8.4V

and turn off at 7.6V.

Other features include low start-up

current, pulse-by-pulse current lim-

iting, and a high-current totem pole

output for driving capacitive loads,

such as gate of a power MOSFET.

The output is low in the off state,

consistent with N-channel devices.

1

Features

VCC

Gnd

COMP

OSC

Sense

VREF

OUTPUT

ENABLE

Internal

Bias

NOR

S

R

PWM

Latch

Current

Sensing

Comparator

R

2 R

1V

Error

Amplifier

-

+

2.50V

Set/

Reset

VCC Undervoltage Lock-out

34V

8.4V/7.6V

R

VFB

VCC Pwr

VOUT

Pwr Gnd

Oscillator

5.0 Volt

Reference

s

Optimized for Off-line

Control

s

Internally Temperature

Compensated Oscillator

s

VREF Stabilized before

Output Stage is Enabled

s

Very Low Start-up Current

300 µA (typ)

s

Pulse-by-pulse Current

Limiting

s

Improved Undervoltage

Lockout

s

Double Pulse Suppression

s

2% 5 Volt Reference

s

High Current Totem Pole

Output

Package Options

Current Mode PWM Control Circuit

CS52843

Description

Block Diagram

Absolute Maximum Ratings

Supply Voltage (ICC<30mA) ..........................................................Self Limiting

Supply Voltage (Low Impedance Source)...................................................30V

Output Current ...............................................................................................±1A

Output Energy (Capacitive Load) .................................................................5µJ

Analog Inputs (VFB, VSENSE)...........................................................-0.3V to 5.5V

Error Amp Output Sink Current...............................................................10mA

Lead Temperature Soldering

Reflow (SMD styles only) ...........60 sec. max above 183°C, 230°C peak

1

7

8

2

3

4

5

6

COMP

VFB

Sense

OSC

VREF

VCC

VOUT

Gnd

8L SO Narrow

A

Company

®

10

7

14

13

12

8

1

2

3

4

5

6

11

9

COMP

NC

VFB

NC

Sense

NC

OSC

VREF

NC

VCC

VCC Pwr

VOUT

Pwr Gnd

Gnd

14L SO Narrow

Rev. 12/23/97

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

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