BD9483F Datasheet, PDF(21/32 Page) Rohm – White LED Driver for large LCD Panels (DCDC Converter type)

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

BD9483F Datasheet, PDF (21/32 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter type)

◁

BD9483F,FV

â3.7.2 starting up 2 (PWM signal inputs and STB succeeds)

VCC

7.0V

STB

PWM1

orPWM2

REG90

6.5V

0.4V

4.0V

Datasheet

0.4V

GATEx

FAILB

OFF

NORMAL

STANDBY

(*1) (*2)

(*3)

(*4) (*5)

(*1)â¦REG90 starts up when STB=H.

Figure 34.

(*2)â¦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)â¦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)â¦As STB=L, instantaneously the boost operation is stopped. (GATE=L, SS=L)

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

www.rohm.com

TSZ22111ã»15ã»001

21/29

TSZ02201-0F1F0C100100-1-2

28.Nov.2013 Rev.003

▷