MC34023 Просмотр технического описания (PDF) - Motorola => Freescale

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Компоненты Описание

производитель

MC34023

High speed single-ended PWM controller

Motorola => Freescale 

MC34023 MC33023

Figure 18. Representative Block Diagram

VCC

Vin

RT

CT

16

Vref

4

Clock

5

6

Ramp 7

Error Amp Output

3

2

Noninverting Input

Inverting Input

1

8

Soft–Start

CSS

Reference

Regulator

Oscillator

4.2 V Vref

UVLO

VCC

UVLO

9.2 V

1.25 V

PWM

Comparator

Error

Amp

+

9.0 µA

R

Q

S

PWM Latch

Current

Limit

0.5 V

R

Q

Soft–Start Latch

S

Shutdown

15

VCC

13

VC

14

Output

12

Power Ground

11

Current Limit Reference

9

Current Limit/Shutdown

1.4 V

10 Ground

Figure 19. Current Limit Operating Waveforms

CT

Clock

Soft–Start

Error Amp Output

Ramp

PWM

Comparator

Output

MOTOROLA ANALOG IC DEVICE DATA

7

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