BP5222X Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Lista de partido

BP5222X

DC / DC converter

ROHM Semiconductor 

BP5220 / BP5221 / BP5222 /

BP5220X / BP5221X / BP5222X

Application example 3 : Output voltage fine adjustment

(1) When reducing the output voltage

(2) When increasing the output voltage

BP5220 / BP5221 / BP5222

BP5220X / BP5221X / BP5222X

9

Be sure to use

fuse for safety

7654321

VIN

+

100µF

VR

VO

+

470µF

BP5220 / BP5221 / BP5222

BP5220X / BP5221X / BP5222X

9

7654321

Be sure to use

fuse for safety

VIN

VR

+

100µF

VO

+

470µF

Fig.7

Fig.8

VR value setting equations(The output voltage after adjustment is denoted Vo.)

(1) When reducing the output voltage

BP5220 / BP5221, BP5220X / BP5221X

R=(VO−1.281) / (0.0278−0.00556VO) (kΩ)

BP5222, BP5222X

R=(Vo−1.281) / (0.1196−0.01Vo) (kΩ)

(2) When increasing the output voltage

BP5220 / BP5221, BP5220X / BP5221X

R=11160 / (48.4Vo−242) (kΩ)

BP5222, BP5222X

R=1200 / (9.368Vo−112) (kΩ)

To make full use of the ability of the the module products, we recommended the output voltage be

adjusted within ± 20% of the output voltage rating. When the output voltage is increased by 20%, for

instance, the minimum input voltage is also increased by 20%.

(Example : When the output voltage is changed from 5V to 6V in the BP5220, the minimum input voltage

is changed from 8V to 9.6V)

Application example 4 : Slow start

The slow start circuit mitigates the pulse load on the internal switching transistor when input voltage is applied,

and rises the output voltage gradually by starting the switching operation slowly.

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.

BP5220 / BP5221 / BP5222

BP5220X / BP5221X / BP5222X

9

7654321

VIN

24V

Be sure to use

fuse for safety

+

100µF

VO

+

470µF

470kΩ

2SC1740R

+ C1

10µF

Fig.9

C1 is a slow-start capacitor for mitigating the over rush current that flows into the modules when the switch is

turned on.

5/8

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