BP5034A5 Просмотр технического описания (PDF) - ROHM Semiconductor

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BP5034A5

AC / DC converter unit

ROHM Semiconductor 

Regulator ICs

FSelecting attached components

(1) Diodes

Use rectifier diodes with the following absolute maximum

ratings: minimum peak reverse voltage is 400V, the

mean rectifying current is more than 0.5V, and minimum

peak forward surge current is 20A. For example,

1SR35-400A is recommended.

(2) Input voltage smoothing capacitor

When the capacitance of this capacitor is increased, the

output voltage is stabilized but the start-up rush current

is increased. The waveforms of rush currents for capaci-

tance values of 3.3µF (Fig. 5) and 10µF (Fig. 7) are

shown in Figs. 6 and 8, respectively. The recommended

capacitance is plotted against the output current in Fig.

9. The capacitor must have a withstand voltage of at least

200V.

Application circuit 1 (CIN = 3.3µF)

BP5034A5

(3) Output voltage smoothing capacitor

Use a capacitor with a small ESR. Specifically, a low-im-

pedance capacitor for power supply switching is recom-

mended. The capacitor’s ESR affects the output ripple

voltage. Capacitor products are listed below for refer-

ence.

Rush current waveform

4

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