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BD9206EFV

LED Driver Series for LCD Backlight Simple Structure Constant Current Backlight Driver for LCD panels (Non-step type)

ROHM Semiconductor 

BD9206EFV

●Timing chart

VCC

VSET

STBY

EN

VREG

3.0V

UVULVOLiOnt(e内rn部al 信sig号na)l

TSTDSDin(t内ern部al信sig号na)l

ILED

①②③④ ⑤

Technical Note

① VCC input.

② VSET Setting

③ It moves to OFF mode due to STBY =

L -> H. 5VREG (VREG) start. Rising

time ms.

④ It becomes UVLO = H depending upon

VREG >3.0V, it moves to stand-by

mode. As for LED driver, it is ready

state.

⑤ LED Lighting with EN = L -> H .

⑥ LED lighting out with EN = H → L

⑦ it is same with ⑤

⑧ Detecting TSD with Ta > 175℃,

LED lighting out

2.9V

⑨ Deleting TSD with Ta < 155℃,

LED lighting

⑩LED lighting out with STBY,EN=H→L

⑪Detecting UVLO=L with VREG<2.9V

⑥

Fig..7

⑦ ⑧ ⑨ ⑩⑪

※Please be careful about a current flowing to the VCC side via the diode for electrostatic breakdown protection if a

voltage is applied to STBY terminal or EN terminal earlier than to VCC terminal.

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7/12

2009.07 - Rev.A

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