bp5020 ROHM Co. Ltd., bp5020 Datasheet - Page 6

• Manufacturer Part Number: bp5020
• Description: Dc / Dc Converter
• Manufacturer: ROHM Co. Ltd.

Application 3: Output voltage fine adjustment
i)
VR value setting equations (the output voltage after adjustment is denoted as V
i)
BP5020 / BP5021
BP5022
ii)
BP5020 / BP5021
BP5022
To make full use of the ability of the hybrid IC, we recom-
mend the output voltage be adjustment within 20% of
the output voltage rating. When the output voltage is in-
creased by 20%, for instance, the minimum input voltage
is also increased by 20 %.
Application 4: Slow start
The slow start circuit mitigates the pulse load on the inter-
nal switching transistor when input voltage is applied,
and rises the output voltage gradually by starting the
switching operation slowly.
C1 is a slow-start capacitor for mitigating the excessive rush current that flows into the hybrid IC when the switch is turned
on.
Regulator ICs
When reducing the output voltage
When reducing the output voltage
When increasing the output voltage
R = (V
R = (V
R = 11160 / (48.4V
R = 1200 / (9.368V
O
O
* 1.281) / (0.0278 * 0.00556V
* 1.281) / (0.1196 * 0.01V
O
O
* 242) (k )
* 112) (k )
O
) (k )
ii) When increasing the output voltage
(Example: When the output voltage is changed from 5V
to 6V in the BP5020, the minimum input voltage is
changed from 8V to 9.6V.)
This application is useful for preventing the malfunction
of an external protection circuit due to a rush current, and
can serve as a countermeasure against the operation
outside the safe operation range.
O
) (k )
BP5020 / BP5021 / BP5022
O
)
317