MC44603A 데이터 시트보기 (PDF) - ON Semiconductor

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MC44603A

Enhanced Mixed Frequency Mode GreenLine™ PWM Controller:

ON Semiconductor 

MC44603A

RF Stby

Rref

RF Stby 15 16 Vref

Negative

R

Active

Q

Clamp

S

UVLO2

Demag

Detect

8

+

65 mV

+

Sync

3.7 V

Input

9

Vref

0.4 Iref

+

0.7 V

VDemag Out

Synchro

VOSC prot

Reference

Block

+

VCC

14.5 V/7.5 V

Vref Iref IF Stby

VCC

18.0 V 1

Vaux

To Power

Transformer

1.0 V

1.6 V

CT

10

+

R

Q

R

S

Q

S

CT

3.6 V

VOSC

S

RPwr Stby

12

Feed−

back

14

Compensation

0.4 Iref

Vref Vref

0.4 Iref

0.6 Iref

Vref

0.8 Iref

IDischarge

Vref

0.25

IF Stby

Vref

0.2 Iref

VCC

1.0 mA

IDischarge/2

2R

+

2.5 V

Error Amplifier

Current Mirror X2

Q

R

Thermal

Shutdown

Vref

0.4 Iref

2.0 ms

Delay

Vref

5.0 ms

Delay

+

1.6 V

+ 2.5 V

VOVP

Out

Vref

VCC

11.6 k

2.0 k

13

5

Foldback

Input

R 1.0 V

2.4 V

5.0 mA

UVLO1

VCC

+ 9.0 V

VC

2

Output

3

4

GND

OVP

6

ROVP

Current

Sense Input

7

= Sink only

= Positive True Logic

11 SS/Dmax/VM

RSS

CSS

This device contains 243 active transistors.

Figure 1. Representative Block Diagram

http://onsemi.com

6

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