UC3842B(2013) Просмотр технического описания (PDF) - ON Semiconductor

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Компоненты Описание

производитель

UC3842B
(Rev.:2013)

High Performance Current Mode Controllers

ON Semiconductor 

UC3842B, UC3843B, UC2842B, UC2843B

VCC

Vin

VCC 7(12)

Vref

8(14)

RT

2.5V

R Internal

Bias

R

CT 4(7)

Voltage

Feedback

Input 2(3)

Output/

Compensation 1(1)

Oscillator

+ 1.0mA

2R

Error

R

Amplifier

Reference

Regulator

VCC

UVLO

+

-

3.6V

+

-

Vref

UVLO

S

Q

R

PWM

Latch

1.0V

Current Sense

Comparator

GND 5(9)

Pin numbers adjacent to terminals are for the 8-pin dual-in-line package.

Pin numbers in parenthesis are for the D suffix SOIC-14 package.

36V

(See

Text)

VC

7(11)

Output

Q1

6(10)

Power Ground

5(8)

Current Sense Input

3(5)

RS

= Sink Only Positive True Logic

Figure 19. Representative Block Diagram

Capacitor CT

Latch

“Set" Input

Output/

Compensation

Current Sense

Input

Latch

“Reset" Input

Output

Large RT/Small CT

Figure 20. Timing Diagram

Small RT/Large CT

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