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BD9483F

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

ROHM Semiconductor 

BD9483F,FV

●3.7 Timing chart

●3.7.1 starting up 1 (STB inputs and PWM signal succeeds)

Datasheet

Figure 33.

(*1)…REG90 starts up when VCC is more than 7.0V and STB=H.

(*2)…When REG90 is more than 6.5V, the reset signal is released. The pin SS is not charged in the state that the PWM signal is

not input, the boost is not started.

(*3)…The charge of the pin SS starts by the positive edge of PWM1orPWM2=L to H, and the soft start starts. The GATEx pulse

outputs only during the corresponding PWMx=H. And as the SS is less than 0.4V(typ), the pulse does not output. The pin

SS continues charging in spite of the assertion of PWM or OVP level.

Please refer to the section “●3.1 Pin Function/SS”.

(*4)…The soft start interval will end if the voltage of the pin SS, Vss reaches to 4.0V. By this time, BD9483F,FV boost Vout to the

voltage where the set LED current flows. It is started to monitor the abnormal detection of FBMAX.

(*5)…As STB=L, instantaneously the boost operation is stopped. (GATEx=L, SS=L)

(*6)…As STB=H again, the boost operation restarts by the next PWM=H. It is the same operation as the timing of (*2).

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28.Nov.2013 Rev.003

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