UC2842AQ Datasheet

IC型号：
UC2842AQ
PDF描述：
汽车类电流模式 PWM 控制器
文件大小：
458.23KB
PDF页数：
15页
芯片厂家：
TI

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UC1842A/3A/4A/5A

UC2842A/3A/4A/5A

UC3842A/3A/4A/5A

Current Mode PWM Controller

FEATURES

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Optimized for Off-line and DC to DC

Converters

Low Start Up Current (<0.5mA)

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

Part #

UVLO On

16.0V

8.5V

16.0V

8.5V

UVLO Off

10.0V

7.9V

10.0V

7.9V

Maximum Duty

Cycle

<100%

<50%

DESCRIPTION

The UC1842A/3A/4A/5A family of control ICs is a pin for pin compat-

ible improved version of the UC3842/3/4/5 family. Providing the nec-

essary features to control current mode switched mode power

supplies, this family has the following improved features. Start up cur-

rent is guaranteed to be less than 0.5mA. Oscillator discharge is

trimmed to 8.3mA. During under voltage lockout, the output stage can

sink at least 10mA at less than 1.2V for V

over 5V.

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

below.

High Current Totem Pole Output

Internally Trimmed Bandgap Reference

500kHz Operation

Low R

Error Amp

UC1842A

UC1843A

UC1844A

UC1845A

BLOCK DIAGRAM

Note 1: A/B A = DIL-8 Pin Number. B = SO-14 Pin Number.

Note 2: Toggle flip flop used only in 1844A and 1845A.

9/94

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