BD9486F データシートの表示（PDF） - ROHM Semiconductor

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BD9486F

1ch Boost up type White LED Driver for large LCD

ROHM Semiconductor 

BD9486F

3.5.3 Turn Off

Datasheet

STB

PWM

REG50

2.3V

REG50UVLO

DIMOUT

GATE

Vout

SS

RT 2.0V

STATE

ON

Dischange

OFF

(*1)

(*2)

Figure 34. Turn Off

(*1)…As STB=H→L、boost operation stops and REG50 starts to discharge.

(*2)…While STB=L, REG50UVLO=H, DIMOUT becomes same as PWM. REG50=5.0V is discharged by -5μA until

REG50=2.3V,and then IC becomes OFF state. REG50 is discharged rapidly and RT becomes 0V at the same time. VOUT is

discharged completely until this time. It should be set to avoid a sudden brightness.

About capacitance value setting of REG50, please refer to the section 3.2.2.

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13.Feb.2014 Rev.004

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