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BD9486F

1ch Boost up type White LED Driver for large LCD

ROHM Semiconductor 

BD9486F

3.5.6 FBMAX Detection

STB

PWM

Datasheet

REG50

4.0V

4.0V

FB

GATE

CP

SS

・・・・・

・・・・・

①②③ ④

3.0V

3.7V

RT

2.0V

STATE STANDBY

SS

(*1) (*2)

NORMAL

(*3)

CP COUNTOR

STANDBY SS

latch

off

(*4)

(*5) (*6)

(*7)

Figure 37. FBMAX Detection

(*2)…During the soft start, it is not judged to the abnormal state even if the FB=H(FB>4.0V).

(*3)…When the PWM=H and FB=H, the abnormal counter doesn’t start immediately.

(*4)…The CP charge will start if the PWM=H and the FB=H detection continues up to 4 clocks of the GATE frequency. Once the

count starts, only FB level is monitored.

(*5)…When the FBMAX detection continues till the CP charge reaches 3.0V, IC will be latched off. The latch off interval can be

calculated by the external capacitance of CP pin. (Please refer to section 3.2.8.)

(*6)…The latch off state can be reset by the STB=L.

(*7)…It is normally started by PWM=L to H, in this figure.

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