UC2844BL Просмотр технического описания (PDF) - ON Semiconductor

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Компоненты Описание

производитель

UC2844BL

High Performance Current Mode Controllers

ON Semiconductor 

UC3844B, UC3845B, UC2844B, UC2845B

VCC

Vin

VCC 7(12)

36V

Vref

Reference

Regulator

8(14)

RT

2.5V

R Internal

Bias

VCC

UVLO

+

−

(See

Text)

VC

R

3.6V

+

−

Vref

7(11)

UVLO

Output

Q1

Oscillator

CT 4(7)

+ 1.0mA

6(10)

Voltage

Feedback

Input 2(3)

Output/

Compensation 1(1)

Error

Amplifier

2R

R 1.0V

S

Q

R

PWM

Latch

Current Sense

Comparator

Power Ground

5(8)

Current Sense Input

3(5)

RS

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.

= Sink Only Positive True Logic

Figure 16. Representative Block Diagram

Capacitor CT

Latch Set"

Input

Output/

Compensation

Current Sense

Input

Latch Reset"

Input

Output

Large RT/Small CT

Figure 17. Timing Diagram

Small RT/Large CT

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