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

3.5.7 LED OCP Detection

Datasheet

STB

PWM

REG50

ISENSE

Abnormal

COUNTOR

SS

GATE

3.0V

3.0V

3.0V

3.0V

Smaller than

4count

4count

3.0V

3.0V

4count

0.4V

DIMOUT

RT 2.0V

STATE

NORMAL LEDOCP NORMAL LEDOCP Latch off Reset NORMAL LEDOCP

abnormal

(*1)

(*2)

abnormal

(*3)

(*4) (*5)

(OFF)

(*6)

(*7)

abnormal

(*8)

Latch off

Figure 38. LED OCP Detection

(*1)…If ISENSE>3.0V, LEDOCP is detected, and GATE becomes L. To detect LEDOCP continuously, The DIMOUT is

compulsorily high, regardless of the PWM dimming signal.

(*2)…When the LEDOCP releases within 4 counts of the GATE frequency, the boost operation restarts.

(*3) …As the LEDOCP is detected again, the boost operation is stopped.

(*4)…If the LEDOCP detection continues up to 4 counts of GATE frequency. IC will be latched off.

(*5)…Once IC is latched off, the boost operation doesn't restart even if the LEDOCP releases.

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

(*7)…It normally starts by STB=L to H.

(*8)…The operation of the LEDOCP detection is not related to the logic of the PWM.

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