CS52845 datasheet(1/6 Pages) CHERRY

부품명	CS52845

상세설명	Current Mode PWM Control Circuit with 50% Max Duty Cycle

PDF	6 Pages

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제조업체	CHERRY [Cherry Semiconductor Corporation]

홈페이지	http://www.cherrycorp.com/

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The CS52845 provides all the nec-

essary features to implement off-

line fixed frequency current-mode

control with a minimum number

of external components.

The CS52845 incorporates a new

precision temperature-controlled

oscillator to minimize variations in

frequency. An internal toggle flip-

flop, which blanks the output

every other clock cycle, limits the

duty-cycle range to less than 50%.

An undervoltage lockout ensures

that VREF is stabilized before the

output stage is enabled. In the

CS52845 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

Undervoltage

Lockout

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

Toggle

Flip-Flop

5.0 Volt

Reference

s

Optimized for Off-line

Control

s

Temperature

Compensated Oscillator

s

50% Maximum Duty-cycle

Clamp

s

VREF Stabilized before

Output Stage is Enabled

s

Low Start-up Current

s

Pulse-by-pulse Current

Limiting

s

Improved Undervoltage

Lockout

s

Double Pulse Suppression

s

1% Trimmed Bandgap

Reference

s

High Current Totem Pole

Output

Package Options

Current Mode PWM Control Circuit

with 50% Max Duty Cycle

CS52845

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

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

1

7

8

2

3

4

5

6

COMP

VFB

Sense

OSC

VREF

VCC

VOUT

Gnd

8L SO Narrow

Rev. 3/4/99

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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CS52845 데이터시트(PDF) 1 Page - Cherry Semiconductor Corporation

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