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MC34063 Datasheet(Fiches technique) 6 Page - ON Semiconductor

Numéro de pièce MC34063
Description  DC-to-DC Converter Control Circuits
Télécharger  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
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MC34063A, MC33063A
http://onsemi.com
6
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 7.)
8
7
6
Rsc
Vin
1
2
Vout
R
R ³ 0 for
constant Vin
7. 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 µs 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 8. External Current Boost Connections for IC Peak Greater than 1.5 A




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