Datasheet > CS52845

CS52845

更新时间： 2024-09-28 23:16:27

品牌	Logo	应用领域
樱桃 - CHERRY		/
页数	文件大小	规格书
6页	145K
描述
Current Mode PWM Control Circuit with 50% Max Duty Cycle

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CS52845 数据手册

CS52845

Current Mode PWM

Control Circuit

with 50% Max Duty Cycle

Description

Features

Optimized for Off-line

ꢀ

The CS52845 provides all the nec-

An undervoltage lockout ensures

that V_REFis stabilized before the

output stage is enabled. In the

CS52845 turn on is at 8.4V and

turn off at 7.6V.

Control

essary features to implement off-

line fixed frequency current-mode

control with a minimum number

of external components.

Temperature

Compensated Oscillator

50% Maximum Duty-cycle

Clamp

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%.

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.

ꢀ V

Stabilized before

REF

Output Stage is Enabled

ꢀ Low Start-up Current

ꢀ Pulse-by-pulse Current

Limiting

ꢀ Improved Undervoltage

Absolute Maximum Ratings

Lockout

ꢀ Double Pulse Suppression

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

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

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

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

Analog Inputs (V_FB, V_SENSE)...........................................................-0.3V to 5.5V

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

Lead Temperature Soldering

ꢀ 1% Trimmed Bandgap

Reference

ꢀ High Current Totem Pole

Output

Package Options

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

8L SO Narrow

Block Diagram

V_REF

COMP

V_FB

_CCUndervoltage Lock-out

V_CC

V_CCPwr

V_OUT

Gnd

Sense

OSC

34V

Set/

5.0 Volt

V_REF

Reset Reference

Gnd

V_FB

8.4V/7.6V

Internal

Bias

14L SO Narrow

Error

Amplifier

COMP

V_REF

Undervoltage

Lockout

COMP

2.50V

V_FB

V_CC

Toggle

V_OUT

NOR

OSC

Flip-Flop

Oscillator

11 V_CCPwr

Sense

V_OUT

2 R

Pwr Gnd

Gnd

PWM

Latch

Current

Sensing

Pwr Gnd

OSC

Sense

Comparator

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

Rev. 3/4/99

Company

12 3 4 5 6

中文翻译

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