BD8966FVM(2009) Ver la hoja de datos (PDF) - ROHM Semiconductor

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Fabricante

BD8966FVM
(Rev.:2009)

Low Noise High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

ROHM Semiconductor 

BD8966FVM

Technical Note

●Description of operations

・Soft-start function

EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during

startup, by which it is possible to prevent an overshoot of output voltage and an inrush current.

・Shutdown function

With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference

voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0μF (Typ.).

・UVLO function

Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. And the hysteresis width of

300mV (Typ.) is provided to prevent output chattering.

Hysteresis 100mV

VCC

EN

VOUT

Standby mode

Tss

Soft start

Operating mode

Tss

Tss

Standby

mode

Operating mode

Standby

mode

Operating mode

Standby mode

UVLO

UVLO

EN

UVLO

Fig.22 Soft start, Shutdown, UVLO timing chart

・Short-current protection circuit with time delay function

Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for

at least 1 ms. The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking UVLO.

EN

VOUT

Limit

IL

Standby

mode

Output OFF

latch

Operating mode

1msec

Standby

mode

Operating mode

EN

Timer latch

EN

Fig.23 Short-current protection circuit with time delay timing chart

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© 2009 ROHM Co., Ltd. All rights reserved.

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2009.05 - Rev.A

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