BD3951F Просмотр технического описания (PDF) - ROHM Semiconductor
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BD3951F Datasheet PDF : 10 Pages
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BD3951F
Technical Note
10. Output capacitor between output terminal and GND must be used to prevent undesirable oscillation. Ceramic Capacitor
3.3μF～2200μF can be used. When selecting the value of the output capacitor, please make sure that the operation
on the actual application takes these conditions into account: rapid input or load transient response.
11. BD3951F might be damaged from the exceed inflow current from the terminals to VCC (for instance, VCC is short to
GND while the output capacitor is charging.). In those cases, VCC series diode (to prevent inflow current) or bypass
diode (connected from terminals to VCC) should be used externally in an application.
12. The over-current protection circuits are built in at the output to prevent the IC from being damaged when the load is
short-circuited or over-current. This protection circuit is droop type and designed not to latch-up in an unexpected huge
current driven.
13. BD3951F has thermal Shut Down protection (TSD) which performs Power Tr OFF in high Tj condition. If Tj increase
more than TSD temperature, output power transistor would OFF. After Tj cooled down, the device would be recovered
automatically. This function is designed for to protect the device at the accidental unexpected conditions. Since TSD
setting is higher temperature than absolute maximum ratings, thermal design must has done not to use this function.
14. Bypass capacitor 0.33μF～10mF into the nearest position between VCC pin and GND is recommended.
15. Insert power zenner diode between VCC terminal and GND terminal is necessary, if more than 50V serge voltage would
be supplied to VCC terminals.
16. The SOUT terminal is only activated (“H”/“L”) while the RESET is “H”. While the RESET terminal is “L”, the SOUT
terminal is always “L”.
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© 2009 ROHM Co., Ltd. All rights reserved.
2009.07 - Rev.A
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