BD9206EFV_14 Datasheet, PDF (10/21 Pages) Rohm – Simple Structure Constant Current Backlight Driver for LCD panels

BD9206EFV
3. Timing Chart
VCC
VSET
STBY
EN
VREG
3.0V
UVLO internal signal
TSD internal signal
ILED
Datasheet
2.9V
① VCC input.
② VSET Setting
③ It enters OFF mode due to STBY = L to H.
5VREG (VREG) start. Rising time ms.
④ UVLO = H when VREG > 3.0V. Then, it
enters standby mode. For LED driver, it
enters ready-state.
⑤ LED Lighting ON when EN = L to H .
⑥ LED lighting OFF with EN = H to L
⑦ similar to ⑤
⑧ Detecting TSD when Ta > 175°C,
LED lighting OFF
⑨ Releasing TSD when Ta < 155°C,
LED lighting ON
⑩ LED lighting OFF when STBY,EN=H to L
⑪ Detects UVLO=L when VREG<2.9V
①②③④ ⑤
⑥
⑦ ⑧ ⑨ ⑩⑪
Figure 13
Note: Be careful of the current flowing to VCC through the electrostatic breakdown protection diode when a voltage is
applied to STBY terminal or EN terminal earlier than VCC terminal .
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