BD9285F ROHM [Rohm], BD9285F Datasheet - Page 29

• Manufacturer Part Number: BD9285F
• Description: Boost 1channel white LED driver For large LCDs
• Manufacturer: ROHM [Rohm]

Datasheet
BD9285F
3.7.4 the soft start function
(*1)…The SS pin charge does not start by just STB=H. “PWM1=H and PWM2=H” is required to start the soft start. In the low SS
voltage, the GATE pin duty is depend on the SS voltage. And as the SS is less than 1.1V, the pulse does not output.
(*2)…By the low STB=L, the SS pin is discharged immediately.
(*3)…As the STB recovered to STB=H, The SS charge starts immediately by the logic “PWM1 and PWM2=H” in this chart.
(*4)…The SS pin is discharged immediately by the UVLO=L.
(*5)…The SS pin is discharged immediately by the VCCUVLO=L
(*6)…The SS pin is discharged immediately by the TC54UVLO=L
(*7)…The SS pin is not discharged by the abnormal detection of the latch off type such as OVP until the latch off
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