Datasheet > UTCUC3842A

UTCUC3842A

更新时间： 2024-09-17 22:41:39

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
7页	117K
描述
CURRENT MODE PWM CONTROL CIRCUITS

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中文翻译

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UTCUC3842A 数据手册

UTC UC3842A / 3843A LINEAR INTEGRATED CIRCUIT

CURRENT MODE PWM CONTROL

CIRCUITS

DESCRIPTION

SOP-8

The UTC UC3842A/3843A provide the necessary functions

to implement off-line or DC to DC fixed frequency current

mode , controlled switching circuits with a minimal external

part count

FEATURES

*Low external part count.

*Low start up current

( Typical 0.12mA )

*Automatic feed forward compensation

*Pulse-by-Pulse current limiting

*Under-voltage lockout with hysteresis

*Double pulse Suppression

DIP-8

*High current totem pole output to drive MOSFET directly

*Internally trimmed band gap reference

*500kHz operation

BLOCK DIAGRAM

Vcc

GND

Vcc

Vref

5V REF

S/R

Internal

Bias

U.V.L.O

Vref

Good

Logic

1/2Vref

CURRENT

SENSE

1/3Vref

COMPARATOR

VFB

COMP

ERROR

AMPLIFIER

PWM

OUTPUT

GND

LATCH

CURRENT SENSE

RT/CT

OSCILLATOR

ABSOLUTE MAXIMUM RATINGS(Ta=25°C)

PARAMETER

Supply Voltage(Low Impedance Source)

Supply Voltage(Icc<30mA)

Output Current ( Peak )

SYMBOL

VALUE

UNIT

VCC

Vcc

Self Limiting

+-1

Output Energy(capacity Load)

Analog Inputs(pin 2,3)

Error Amplifier Output Sink Current

Power Dissipation

-0.3 ~ +6.3

µJ

°C

VI(ANA)

ISINK(EA)

PD DIP-8

SOP-8

at Tamb<=25°C 1.0

at Tamb<=25°C 0.5

300

Lead Temperature( Soldering 10 Sec )

Tlead

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R103-002,A

12 3 4 5 6 7

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