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MC34063A Datasheet(PDF) 7 Page - ON Semiconductor

Part No. MC34063A
Description  1.5 A, Step-Up/Down/Inverting Switching Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC34063A Datasheet(HTML) 7 Page - ON Semiconductor

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MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
www.onsemi.com
7
1.25 V
Ref
Reg
Vout
5.0 V/500 mA
1.0
mH
Vout
+
100
Optional Filter
8
7
Rsc
0.33
6
Vin
25 V
100
+
R1
1.2 k
R2
3.6 k
SQ
R
Q2
Q1
Ipk
OSC
CT
VCC
+
-
Comp.
1
2
3
4
CT
470
pF
470
CO
+
5
L
1N5819
220
mH
Test
Conditions
Results
Line Regulation
Vin = 15 V to 25 V, IO = 500 mA
12 mV =
±0.12%
Load Regulation
Vin = 25 V, IO = 50 mA to 500 mA
3.0 mV =
±0.03%
Output Ripple
Vin = 25 V, IO = 500 mA
120 mVpp
Short Circuit Current
Vin = 25 V, RL = 0.1 W
1.1 A
Efficiency
Vin = 25 V, IO = 500 mA
83.7%
Output Ripple With Optional Filter
Vin = 25 V, IO = 500 mA
40 mVpp
Figure 11. Step−Down Converter
11a. External NPN Switch
11b. External PNP Saturated Switch
8
7
6
Rsc
Vin
1
2
Vout
8
7
6
Rsc
Vin
1
2
V
Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A


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