BD9483F 데이터 시트보기 (PDF) - ROHM Semiconductor

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BD9483F

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

ROHM Semiconductor 

BD9483F,FV

●3.7.2 starting up 2 (PWM signal inputs and STB succeeds)

VCC

7.0V

STB

PWM1

orPWM2

REG90

SS

6.5V

0.4V

4.0V

Datasheet

0.4V

GATEx

FAILB

H

OFF

SS

NORMAL

STANDBY

SS

(*1) (*2)

(*3)

(*4) (*5)

(*1)…REG90 starts up when STB=H.

Figure 34.

(*2)…When REG90 is more than 6.5V, the reset signal is released. In the first PWM=H the soft-start begins the changing

immediately. 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.

(*3)…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

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

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

(*5)…As STB=H again, it is the same operation as the timing of (*1).

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