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PDF BP5250-24 Data sheet ( Hoja de datos )
| Número de pieza | BP5250-24 | |
| Descripción | DC/DC converter | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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DC/DC converter
BP5250/BP5250-24
The BP5250/BP5250-24 are DC/DC converters for step-down that can drive PchFET using PWM system.
The voltage setting resistor and the combination of external power elements enable you to make any power
circuit to your liking. High-efficient DC/DC converter can be made easy by adding external components such
as I/O smoothing capacitor without designing circuit.
Applications
OA appliances(copy machine,personal computer, facsimile), AV appliances (car navigation, DVD etc.),
and industrial appliances.
Features
1) High power conversion(η=90% Vin=12V 5V/2A)
2) Power save pin(Leakage current at OFF mode : IR=10µAMAX)
3) Output voltage can be established from 1.5V to 9V in the VADJ pin.(For BP5250, however, output voltage is
limted by input voltage.)
4) With recovery type overcurrent protection function (Detection current can be established by the external
current detection resistance.)
5) Power circuit can be made easy by adding external smoothing capacitor and power element.
6) Reference voltage accuracy 1.25V±1%
Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Limits
Unit
BP5250 BP5250-24
Condition
Input voltage
Vi 24 30 V DC
ESD endurance
Vsurge
1
kV (EIAJ ED4701-1C-111A)
Operating temperature range
Topr
−40 ∼ +85
°C
Storage temperature range
Tstg −50 ∼ +100 °C
Allowable max surface temperature Tfmax
100
°C Ambient temperature+The module self-heating ≤ Tfmax
The power saving terminal voltage
VCTL
24
30 V Vi ≥ VCTL
Recommended operating conditions (Ta=25°C)
Parameter
Symbol Min. Typ.
BP5250
Input voltage
BP5250-24
Vi
8 12
20 24
Max.
16
27
Unit
V
V
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1 page  
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
17V
24V
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
1
Vi
2
SW GND IS
345
Vo
6
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
5 Page 
Precautions on Use of ROHM Power Module
Safety Precautions
1) The products are designed and produced for application in ordinary electronic equipment (AV equipment,
OA equipment, telecommunication equipment, home appliances, amusement equipment etc.).
If the products are to be used in devices requiring extremely high reliability (medical equipment, transport
equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or operational error may endanger human life
and sufficient fail-safe measures, please consult with the Company's sales staff in advance. If product
malfunctions may result in serious damage, including that to human life, sufficient fail-safe measures
must be taken, including the following:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits in the case of single-circuit failure
2) The products are designed for use in a standard environment and not in any special environments.
Application of the products in a special environment can deteriorate product performance. Accordingly,
verification and confirmation of product performance, prior to use, is recommended if used under the
following conditions:
[a] Use in various types of liquid, including water, oils, chemicals, and organic solvents
[b] Use outdoors where the products are exposed to direct sunlight, or in dusty places
[c] Use in places where the products are exposed to sea winds or corrosive gases, including
Cl2, H2S, NH3, SO2, and NO2
[d] Use in places where the products are exposed to static electricity or electromagnetic waves
[e] Use in proximity to heat-producing components, plastic cords, or othe flammable items
[f] Use involving sealing or coating the products with resin or other coating materials
[g] Use involving unclean solder or use of water or water-soluble cleaning agents for cleaning after
soldering
[h] Use of the products in places subject to dew condensation
3) The products are not radiation resistant.
4) The Company is not responsible for any problems resulting from use of the products under conditions not
recommended herein.
5) The Company should be notified of any product safety issues. Moreover, product safety issues should be
periodically monitored by the customer.
Precautions Regarding Application Example and External Circuits
1) If change is made to the constant of an external circuit, allow a sufficient margin due to variations of the
characteristics of the products and external components, including transient characteristics, as well as
static characteristics. Please be informed that the Company has not conducted investigations on whether
or not particular changes in the application examples or external circuits would result in the infringement
of patent rights of a third party.
2) The application examples, their constants, and other types of information contained herein are applicable
only when the products are used in accordance with standard methods.
Therefore, if mass production is intended, sufficient consideration to external conditions must be made.
Prohibitions Regarding Industrial Property
1) These Specifications contain information related to the Company’s industrial property. Any use of them
other than pertaining to the usage of appropriate products is not permitted. Duplication of these
Specifications and its disclosure to a third party without the Company’s permission is prohibited.
2) Information and data on products, including application examples, contained in these specifications are
simply for reference; the Company does not guarantee any industrial property rights, intellectual property
rights, or any other rights of a third party regarding this information or data. Accordingly, the Company
does not bear any responsibility for:
[a] infringement of the intellectual property rights of a third party
[b] any problems incurred by the use of the products listed herein.
3) The Company prohibits the purchaser of its products to exercise or use the intellectual property rights,
industrial property rights, or any other rights that either belong to or are controlled by the Company, other
than the right to use, sell, or dispose of the products.
11/11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet BP5250-24.PDF ] | |
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