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UC1845ALQMLV

更新时间： 2024-11-04 04:27:11

品牌	Logo	应用领域
德州仪器 - TI		开关控制器
页数	文件大小	规格书
24页	720K
描述
CURRENT MODE PWM CONTROLLER

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UC1845ALQMLV 数据手册

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

www.ti.com

SLUS223C–APRIL 1997–REVISED JUNE 2007

CURRENT MODE PWM CONTROLLER

FEATURES

DESCRIPTION

•

Optimized For Off-line and DC-to-DC

Converters

The UC1842/3/4/5 family of control devices provides

the necessary features to implement off-line or

dc-to-dc fixed frequency current mode control

•

Low Start-Up Current (<1 mA)

Automatic Feed Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load Response Characteristics

Under-Voltage Lockout With Hysteresis

Double Pulse Suppression

schemes with

a minimal external parts count.

Internally implemented circuits include under-voltage

lockout featuring start up current less than 1 mA, 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 designed to source or

sink high peak current. The output stage, suitable for

driving N-Channel MOSFETs, is low in the off state.

High Current Totem Pole Output

Internally Trimmed Bandgap Reference

500-kHz Operation

Differences between members of this family are the

under-voltage lockout thresholds and maximum duty

cycle ranges. The UC1842 and UC1844 have UVLO

thresholds of 16 V_ONand 10 V_OFF, ideally suited to

off-line applications. The corresponding thresholds

for the UC1843 and UC1845 are 8.4 V and 7.6 V.

The UC1842 and UC1843 can operate to duty cycles

approaching 100%. A range of zero to 50% is

obtained by the UC1844 and UC1845 by the addition

of an internal toggle flip flop which blanks the output

off every other clock cycle.

Low R_OError Amp

BLOCK DIAGRAM

7 12

UVLO

34 V

5 V

REF

S/R

8 14

GROUND

REF

5 V

50 mA

2.50 V

Internal

BIAS

VREF

Good

Logic

OSC

R /C

Error

Amp

OUTPUT

PWM

LATCH

POWER

GROUND

1 V

CURRENT

SENSE

COMP

COMPARATOR

CURRENT

SENSE

Note 1:

Note 2:

A = DIL−8 Pin Number. B = SO−14 and CFP−14 Pin Number.

Toggle flip flop used only in 1844 and 1845.

A/B

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...24

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UC1845ALQMLV 替代型号

型号	品牌	替代类型	描述	数据表
SG1845L-TR	MICROSEMI	功能相似	暂无描述
5962-8670404VXA	TI	功能相似	Current Mode PWM Controller

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