UC2845AQ

更新时间： 2024-02-26 00:32:24

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
15页	591K
描述
CURRENT-MODE PWM CONTROLLER

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数据手册

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UC2845AQ 数据手册

UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ

CURRENT-MODE PWM CONTROLLER

SGLS164 – APRIL 2003

D 8-PIN PACKAGE

(TOP VIEW)

Extended Temperature Performance of

–40°C to 125°C

Optimized for Off-line and DC to DC

Converters

COMP

REF

Low Start Up Current (<0.5 mA)

Trimmed Oscillator Discharge Current

Automatic Feed Forward Compensation

Pulse-by-Pulse Current Limiting

Enhanced Load Response Characteristics

Under-Voltage Lockout With Hysteresis

Double Pulse Suppression

OUTPUT

GND

SENSE

R /C

D 14-PIN PACKAGE

(TOP VIEW)

COMP

REF

High Current Totem Pole Output

Internally Trimmed Bandgap Reference

500 kHz Operation

OUTPUT

GND

SENSE

Low R Error Amp

R /C

PWR GND

description

The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5

family. Providing the necessary features to control current mode switched mode power supplies, this family has the

following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed

to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for V

5 V.

over

The difference between members of this family are shown in the table below.

PART NUMBER

UC2842A

UVLO ON

16 V

UVLO OFF

10 V

MAXIMUM DUTY CYCLE

<100%

<50%

UC2843A

8.5 V

7.9 V

UC2844A

16 V

10 V

UC2845A

8.5 V

7.9 V

<50%

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 Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...15

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