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