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MC34063AP1 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. MC34063AP1
Description  1.5 A, Step−Up/Down/ Inverting Switching Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC34063A, MC33063A, NCV33063A
http://onsemi.com
6
9a. External NPN Switch
9b. External NPN Saturated Switch
(See Note 8)
8
7
6
Rsc
Vin
1
2
Vout
R
R
³ 0 for
constant Vin
8. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (
≤ 300 mA) and high driver currents
(
≥ 30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non−Darlington configuration is used, the following output drive condition is recommended.
8
7
6
Rsc
Vin
1
2
Vout
Figure 9. External Current Boost Connections for IC Peak Greater than 1.5 A




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