MC33025DW View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

View to exact match

MC33025DW

High speed double-ended PWM controller

Motorola => Freescale 

MC34025 MC33025

Figure 18. Representative Block Diagram

VCC

Vin

16

Vref

4

Clock

5

RT

CT

6

Ramp 7

Error Amp Output

3

2

Noninverting Input

Inverting Input

1

8

Soft–Start

CSS

Reference

Regulator

4.2 V

Oscillator

PWM

1.25 V Comparator

Error

Amp

+

9.0 µA

Vref

UVLO

R

Q

S

PWM Latch

VCC

UVLO

9.2 V

Q

T

Q

Steering

Flip Flop

Current

Limit

R

Q

0.5 V

S

Soft–Start Latch

Shutdown

15

VCC

13

VC

14

Output B

11

Output A

12

Power Ground

1.0 V

9

Current Limit/

Shutdown

1.4 V

10

Ground

CT

Clock

Soft–Start

Error Amp Output

Ramp

PWM

Comparator

Output A

Output B

Figure 19. Current Limit Operating Waveforms

MOTOROLA ANALOG IC DEVICE DATA

7

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