MC34025 datasheet(7/20 Pages) ONSEMI

Part #	MC34025

Description	High Speed Double-Ended PWM Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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MC34025 MC33025

7

MOTOROLA ANALOG IC DEVICE DATA

Vref

VCC

UVLO

Reference

Regulator

4.2 V

Figure 18. Representative Block Diagram

Q

S

R

Q

T

Steering

Flip Flop

Output A

1.0 V

0.5 V

16

4

5

6

7

3

2

1

8

CSS

10

9

11

12

14

13

15

PWM Latch

Soft–Start Latch

Vin

9.0

µA

Error

Amp

PWM

Comparator

Vref

UVLO

9.2 V

Oscillator

1.4 V

Current

Limit

Q

S

R

VCC

Clock

RT

CT

Noninverting Input

Inverting Input

Error Amp Output

Ramp

Soft–Start

Ground

Current Limit/

Shutdown

Power Ground

Output B

VC

VCC

+

1.25 V

Shutdown

Figure 19. Current Limit Operating Waveforms

Output B

Output A

PWM

Comparator

Ramp

Clock

CT

Soft–Start

Error Amp Output

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MC34025 Datasheet(PDF) 7 Page - ON Semiconductor

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