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BP5250 Datasheet(PDF) 5 Page - Rohm |
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BP5250 Datasheet(HTML) 5 Page - Rohm |
5 / 12 page 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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