MC33363 Datasheet, PDF (7/12 Pages) ON Semiconductor – HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR

MC33363
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 ⁴⁵⁰
9.0
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
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