UC1845AL

更新时间： 2024-11-23 12:05:55

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
28页	708K
描述
CURRENT MODE PWM CONTROLLER

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UC1845AL 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...28

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与UC1845AL相关器件

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UC1845AL/883B	ROCHESTER	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CQCC20
UC1845AL883B	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845ALQMLV	TI	获取价格	CURRENT MODE PWM CONTROLLER
UC1845AMDREP	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1845AMDREPG4	TI	获取价格	CURRENT-MODE PWM CONTROLLER
UC1845A-SP	TI	获取价格	耐辐射 QMLV、30V 输入、1A 单路输出 500kHz PWM 控制器、50% 占空
UC1845AY	ETC	获取价格	Current-Mode SMPS Controller
UC1845D	ETC	获取价格	SMPS Controller
UC1845D8	ETC	获取价格	SMPS Controller
UC1845D8TR	ETC	获取价格	SMPS Controller

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