MC34063A, MC33063A, NCV33063A
8
1
S
R
Q
Q2
Q1
7
6
2
3
I
88 mH
pk
L
+
R
0.24
sc
C
T
OSC
V
in
4.5 V to 6.0 V
V
CC
+
100
1.25 V
Ref
Reg
1500
pF
+
−
1N5819
Comp.
5
4
1.0 mH
R1
V
out
−12 V/100 mA
V
out
953
1000 mf
100
C
R2 8.2 k
O
+
+
Optional Filter
Test
Conditions
= 4.5 V to 6.0 V, I = 100 mA
Results
Line Regulation
Load Regulation
Output Ripple
V
in
V
in
V
in
V
in
V
in
V
in
3.0 mV = 0.012%
0.022 V = 0.09%
500 mVpp
O
= 5.0 V, I = 10 mA to 100 mA
O
= 5.0 V, I = 100 mA
O
Short Circuit Current
Efficiency
= 5.0 V, R = 0.1 W
910 mA
L
= 5.0 V, I = 100 mA
62.2%
O
Output Ripple With Optional Filter
= 5.0 V, I = 100 mA
70 mVpp
O
Figure 12. Voltage Inverting Converter
8
7
6
1
1
2
V
out
8
7
2
3
V
out
V
in
+
3
4
V
in
6
+
4
Figure 13. External Current Boost Connections for IC Peak Greater than 1.5 A
13a. External NPN Switch 13b. External PNP Saturated Switch
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8
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