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MC34063A View Datasheet(PDF) - Texas Instruments

Part NameMC34063A TI
Texas Instruments TI
Description1.5-A Peak Boost/Buck/Inverting Switching Regulators
MC34063A Datasheet PDF : 30 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
www.ti.com
Application Information (continued)
8
1
7
2
RSC
VIN
6
MC33063A, MC34063A
SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015
8
7
VOUT RSC
VIN
6
1
VOUT
2
a) EXTERNAL npn SWITCH
b) EXTERNAL pnp SATURATED SWITCH
Figure 6. Buck Regulator Connections for IC Peak Greater Than 1.5 A
8
7
6
VIN
1
8
2
7
VOUT
3
VIN
6
1
VOUT
2
3
5
4
5
4
a) External NPN Switch
b) External PNP Saturated Switch
Figure 7. Inverting Regulator Connections for IC Peak Greater Than 1.5 A
9.2 Typical Application
9.2.1 Voltage-Inverting Converter Application
8
1
SQ
R
Q2
Q1
7
RSC
0.24 W
VIN
4.5 V to 6.0 V
6
VCC
+
100 mF
5
Ipk
Oscillator CT
+
_ Comparator
R2
8.2 kW
R1
953 W
2
L
88 mH
1.25-V
Reference
Regulator
3
+
1500 pF
4
1N5819
CO
1000 mF
1.0 mH
VOUT
−12 V/100 mA
100 mF
+
VOUT = –1.25 (1+ RR21)
+
Optional Filter
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