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MC34063AD Datasheet(PDF) 9 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

Part No. MC34063AD
Description  SMPS Controller
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Manufacturer  ARTSCHIP [ARTSCHIP ELECTRONICS CO.,LMITED.]
Direct Link  http://www.artschip.com/
Logo ARTSCHIP - ARTSCHIP ELECTRONICS CO.,LMITED.

MC34063AD Datasheet(HTML) 9 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

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MC34063A MC33063A
www.artschip.com
9
Figure 14. Design Formula Table
V sat=Saturation voltage of the output switch.
VF = Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
V in – Nominal input voltage.
V out – Desired output voltage, | V out | = 1.25 (1 + R2/R1)
I out – Desired output current.
fmin – Minimum desired output switching frequency at the selected values of V in and IO.
Vripple (pp) – Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor value will need to be increase due to its
equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and
load regulation.
NOTE:
For further information refer to Application Note AN920A/D and AN954/D.


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