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MC33163P
3.4 A, Step−Up/Down/Inverting Switching Regulators
ON Semiconductor
MC33163P Datasheet PDF : 16 Pages
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MC34163, MC33163
I
pk Sense
R
SC
V
CC
Timing Capacitor
C
T
Shutdown
R
DT
GND
8
0.25 V
+
−
Current
Limit
+
7
+
6 Oscillator
R
5
Q
Thermal
S
4
Latch
+
9 Driver Collector
10
Switch Collector
Q
1
11
Q
2
12
60
GND
13
Voltage Feedback 1 3
14
Voltage Feedback 2 2
45 k
+
Feedback
+
+−
Comparator
Switch Emitter
15
LVI Output 1
+
+−
LVI
1.25 V 15 k
+
1.125 V
2.0 mA
+
7.0 V
16
Bootstrap Input
+
−
(Bottom View)
Figure 19. Representative Block Diagram
=
Sink Only
Positive True Logic
1
Comparator Output
0
1.25 V
Timing Capacitor C
T
0.55 V
1
Oscillator Output
0
On
Output Switch
Off
Nominal Output
Voltage Level
Output Voltage
t
9t
Startup
Quiescent Operation
Figure 20. Typical Operating Waveforms
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