BP5250 Просмотр технического описания (PDF) - ROHM Semiconductor

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BP5250

DC/DC converter

ROHM Semiconductor 

BP5250 / BP5250-24

Output voltage establishment range

Output voltage establishment range is changed by input voltage.Please refer to the Fig.8.

30

25

20

15

10

5

1.5V

0

6

Vi−Vo characteristic

24V

17V

9V

BP5250-24

BP5250

8 10 12 14 16 18 20 22 24 26 28 30

Vi [V]

Fig.8

Caution note for operation

(1) Output voltage establishment range is changed by input voltage.Please refer to the Fig.8.

(2) Layout of external parts may significantly change the output spike noise or characteristics or cause abnomal

oscillation and temperature increase. Note the following for layout.

· Provide the input smoothing electroytic capacitor close to the FET source and pin 2 of the module.

· Provide the output smoothing electrolytic capacitor close to pin 6 of the module together with the

current detection resistor

· Large current may run into the coil, current detection resistor and output through the FET source-

drain.Try to use a solid pattern as much as possible.

· FET drain, coil and flywheel diode may generate heat by power loss. Try to use a solid pattern so that the

heat may be released. Measure a rise in temperature of each element and make sure that it is not

abnormal.

· Provide the negative terminal of the I/O smoothing capacitor and anode terminal of the flywheel diode

close to GND pin 4 of the module.

· Connect the negative terminal of the I/O smoothing electrolytic capacitor and anode terminal of the

flywheel diode nearby.

(3) Output load may cause large ripple current in the I/O smoothing electrolytic capacitor. Note the allowable

ripple current of the capacitor to be used.

(4) As the output smoothing electrolytic capacitor, one with especially low impedance is recommended for

suppresing output ripple voltage. Select a capacitor suited for the use.

(5) Please be sure to use protection circuit function.(R1 should not be 0Ω.)

Output voltage establishment and application circuit example

BP5250-BP5250-24

VCTL Vi SW GND IS Vo

123456

Q1

C4

L1 R1

Vin

C1

SD1

C2

VADJ

7

R3

C3

Vout

R2

∗Application example

Input voltage 12V

Output voltage 5V

Q1 : 2SJ529S/hitachi

SD : RB050L-40/ROHM

L1 : CDRH124-220L/Sumida

C1 : 680µF/25V(ZL seried)/Rubycon

C2 : 680µF/16V(ZL series)/Rubycon

C3 : 0.1µF/16V/ROHM

C4 : 0.1µF/25V/ROHM

R1 : 27mΩ/SUSUMU

R2 : 10kΩ/ROHM

R3 : 30kΩ/ROHM

Fig.9

5/11

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