MC34063A MC33063A
Figure 11. Voltage Inverting Converter
8
S Q
R
7
Ipk
Osc
6
+
100
+
–
5
R1
953
R2
8.2 k
Comp.
1.25 V
Ref
Reg
VCC
Q2
Q1
1
2
L
3
+
1500
pF
1N5819
88
µH
Rsc
0.24
Vin
4.5 V to 6.0 V
CT
4
1.0
µH
Vout
–12 V/100 mA
1000
µf
+
CO
+
100
Vout
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
Output Ripple With Optional Filter
Conditions
Vin = 4.5 V to 6.0 V, IO = 100 mA
Vin = 5.0 V, IO = 10 mA to 100 mA
Vin = 5.0 V, IO = 100 mA
Vin = 5.0 V, RL = 0.1
Ω
Vin = 5.0 V, IO = 100 mA
Vin = 5.0 V, IO = 100 mA
Results
3.0 mV =
±
0.012%
0.022 V =
±
0.09%
500 mVpp
910 mA
62.2%
70 mVpp
Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A
12a. External NPN Switch
12b. External PNP Saturated Switch
8
1
8
1
Vout
7
2
Vout
7
2
Vin
6
Vin
6
MOTOROLA ANALOG IC DEVICE DATA
7
ONSEMI [ ON SEMICONDUCTOR ]
