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BP5250 Datasheet(PDF) 5 Page - Rohm

Part # BP5250
Description  DC/DC converter
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

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BP5250 / BP5250-24
Output voltage establishment and application circuit example
Output voltage establishment and application circuit example
∗Application example
Input voltage 12V
Output voltage 5V
Q1 : 2SJ529S/hitachi
R1 : 27m
Ω/SUSUMU
SD : RB050L-40/ROHM
R2 : 10k
Ω/ROHM
L1 : CDRH124-220L/Sumida
R3 : 30k
Ω/ROHM
C1 : 680
µF/25V(ZL seried)/Rubycon
C2 : 680
µF/16V(ZL series)/Rubycon
C3 : 0.1
µF/16V/ROHM
C4 : 0.1
µF/25V/ROHM
Fig.9
Vout
Vin
R2
R1
L1
R3
C3
C4
Q1
SD1
C2
C1
VCTL
Vi
SW
GND
IS
Vo
VADJ
1
2
3
4
5
6
7
BP5250-BP5250-24
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 0
Ω.)
Output voltage establishment range
Output voltage establishment range is changed by input voltage.Please refer to the Fig.8.
Vi [V]
Vi
−Vo characteristic
30
25
20
15
10
5
0
6
8
10 12 14 16 18 20
28 30
22 24 26
24V
17V
1.5V
9V
BP5250
BP5250-24
Fig.8
5/11


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