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MC33363BP

HIGH VOLTAGE OFF–LINE SWITCHING REGULATOR

ON Semiconductor 

MC33363B

Figure 17. Representative Block Diagram

AC Input

Regulator Output

6.5 V 8

I

6

RT

CT 7

Startup Input 1

Current

Mirror

2.25 I

4I

Oscillator

PWM

Comparator

Thermal

Shutdown

Band Gap

Regulator

Startup

Control

UVLO

OVP

PWM Latch

S

Q

R

Driver

14.5 V/

9.5 V

2.6 V

VCC

3

Overvoltage

Protection

Input

11

16

Power Switch

Drain

Leading Edge

Blanking

Current Limit

Comparator 405

8.1

Compensation

9

270 µA

Gnd 4, 5, 12, 13

Error

Amplifier

2.6 V

10

Voltage

Feedback Input

Figure 18. Timing Diagram

Capacitor CT

Compensation

Oscillator Output

PWM

Comparator

Output

PWM Latch

Q Output

Power Switch

Gate Drive

Leading Edge

Blanking Input

(Power Switch

Drain Current)

Normal PWM Operating Range

Output Overload

DC Output

2.6 V

0.6 V

Current Limit

Propagation

Delay

Current

Limit

Threshold

MOTOROLA ANALOG IC DEVICE DATA

7

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