bp5034a5 ROHM Co. Ltd., bp5034a5 Datasheet - Page 4

• Manufacturer Part Number: bp5034a5
• Description: Ac / Dc Converter Unit
• Manufacturer: ROHM Co. Ltd.

FSelecting attached components
(1)
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)
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 3.3 F (Fig. 5) and 10 F (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 (C
Rush current waveform
4
Regulator ICs
Diodes
Input voltage smoothing capacitor
IN
= 3.3 F)
(3)
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.
Output voltage smoothing capacitor
BP5034A5