UC2844B Просмотр технического описания (PDF) - Motorola => Freescale

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Компоненты Описание

производитель

UC2844B

High Performance Current Mode Controllers

Motorola => Freescale 

UC3844B, 45B UC2844B, 45B

Figure 15. Representative Block Diagram

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

UVLO

7(11)

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 SO–14 package.

= Sink Only Positive True Logic

Capacitor CT

Latch “Set”

Input

Output/

Compensation

Current Sense

Input

Latch “Reset”

Input

Output

Figure 16. Timing Diagram

Large RT/Small CT

Small RT/Large CT

8

MOTOROLA ANALOG IC DEVICE DATA

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