MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
8
7
S Q
R
Q2
Q1
1
2
V in
25 V
R sc
0.33
100
+
6
V CC
I pk
OSC
C T
1.25 V
1N5819
3
C T
L
220 m H
5
+
-
Comp.
R2
Ref
Reg
4
470
pF
V out
1.0 m H
R1
1.2 k
3.6 k
470
+
C O
5.0 V/500 mA
+
100
V out
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
Output Ripple With Optional Filter
Conditions
V in = 15 V to 25 V, I O = 500 mA
V in = 25 V, I O = 50 mA to 500 mA
V in = 25 V, I O = 500 mA
V in = 25 V, R L = 0.1 W
V in = 25 V, I O = 500 mA
V in = 25 V, I O = 500 mA
Results
12 mV = ± 0.12%
3.0 mV = ± 0.03%
120 mVpp
1.1 A
83.7%
40 mVpp
Figure 11. Step ? Down Converter
8
1
8
1
V
R sc
7
2
V out
R sc
7
2
V in
6
V in
6
Figure 12. External Current Boost Connections for I C Peak Greater than 1.5 A
11a. External NPN Switch
http://onsemi.com
7
11b. External PNP Saturated Switch
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