UC3845A

更新时间： 2024-11-22 22:59:31

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		控制器
页数	文件大小	规格书
16页	172K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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中文翻译

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数据手册
替代型号

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UC3845A 数据手册

UC284XA

UC384XA

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

NOT FOR NEW DESIGN

FEATURES

Figure 1. Package

■ TRIMMED OSCILLATOR DISCHARGE

CURRENT

■ CURRENT MODE OPERATION TO 500kHz

AUTOMATIC FEED FORWARD

COMPENSATION

DIP-8

SO-8

■ LATCHING PWM FOR CYCLE-BY-CYCLE

CURRENT LIMITING

■ INTERNALLY TRIMMED REFERENCE WITH

UNDERVOLTAGE LOCKOUT

■ HIGH CURRENT TOTEM POLE OUTPUT

UNDERVOLTAGE LOCKOUT WITH

HYSTERESIS

■ LOW START-UP CURRENT (< 0.5mA)

DOUBLE PULSE SUPPRESSION

Table 1. Order Codes

Part Number

Package

UC2842AD1; UC3842AD1;

UC2843AD1; UC3843AD1;

UC2844AD1; UC3844AD1;

UC2845AD1; UC3845AD1

SO-8

DIP-8

UC2842AN; UC3842AN;

UC2843AN; UC3843AN;

UC2844AN; UC3844AN;

UC2845AN; UC3845AN

DESCRIPTION

The UC384xA family of control ICs provides the

necessary features to implement off-line or DC to

DC fixed frequency current mode control schemes

with a minimal external parts count. Internally im-

plemented circuits include a trimmed oscillator for

precise DUTY CYCLE CONTROL under voltage

lockout featuring start-up current less than 0.5mA,

a precision reference trimmed for accuracy at the

error amp input, logic to insure latched operation,

a PWM comparator which also provides current

limit control, and a totem pole output stage de-

signed to source or sink high peak current. The

output stage, suitable for driving N-Channel MOS-

FETs, is low in the off-state.

Differences between members of this family are

the under-voltage lockout thresholds and maxi-

mum duty cycle ranges. The UC3842A and

UC3844A have UVLO thresholds of 16V (on) and

10V (off), ideally suited off-line applications The

corresponding thresholds for the UC3843A and

UC3845A are 8.5 V and 7.9V. The UC3842A and

UC3843A can operate to duty cycles approaching

100%. A range of the zero to < 50 % is obtained by

the UC3844A and UC3845A by the addition of an

internal toggle flip flop which blanks the output off

every other clock cycle.

Figure 2. Block Diagram (toggle flip flop used only in UC3844A and UC3845A)

UVLO

34V

REF

VREF

5V 50mA

S/R

GROUND

INTERNAL

BIAS

2.50V

VREF GOOD

LOGIC

OUTPUT

RT/CT

OSC

ERROR AMP.

VFB

PWM

LATCH

COMP

CURRENT

SENSE

CURRENT

SENSE

COMPARATOR

D95IN331

REV. 5

1/16

May 2004

12 3 4 5 6 7...16

中文翻译

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UC3845A 替代型号

型号	品牌	替代类型	描述	数据表
UC2845BN	STMICROELECTRONICS	功能相似	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

与UC3845A相关器件

型号	品牌	获取价格	描述	数据表
UC3845A-BW	FCI	获取价格	Current Mode PWM Controller Low Start-Up and Operating Current
UC3845ACD	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845ACS	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845AD	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
UC3845AD	TI	获取价格	Current Mode PWM Controller
UC3845AD1	STMICROELECTRONICS	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3845AD1013TR	STMICROELECTRONICS	获取价格	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, SO-8
UC3845AD8	FCI-CONNECTOR	获取价格	Switching Regulator/Controller
UC3845AD8	TI	获取价格	Current Mode PWM Controller
UC3845AD8G4	TI	获取价格	具有 8.4V/7.6V UVLO 50% 占空比、温度范围为 0°C 至 70°C 的

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