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BD9483F

White LED Driver for large LCD Panels (DCDC Converter type)

ROHM Semiconductor 

BD9483F,FV

Datasheet

●3.7.6 LED OCP detection

STB

PWM1or

PWM2

INSENSE

3.0V

3.0V

3.0V

3.0V

Abnormal

COUNTOR

SS

Smaller than

4count

4count

GATE

DIMOUT

FAILB

3.0V

3.0V

0.4V

4count

STATE

NORMAL LEDOCP NORMAL LEDOCP Latch off Reset NORMAL LEDOCP

abnormal

(*1)

(*2)

abnormal

(*3)

(*4) (*5)

(OFF)

(*6)

(*7)

abnormal

(*8)

Figure 38.

Latch off

(*1)…If ISENSE>3.0V, LEDOCP is detected, it becomes GATE=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, too.

(*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. And both CH1 and CH2 will be

stopped.

(*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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TSZ02201-0F1F0C100100-1-2

28.Nov.2013 Rev.003

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