SM8132A データシートの表示（PDF） - Nippon Precision Circuits

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SM8132A

White LED Driver IC

Nippon Precision Circuits  

SM8132A

VIN

input voltage

Low ILED

detector

VOUT mode

1.0 mode

VOUT

output voltage

Low ILED

detected

1.5 mode

1.0 1.5 threshold

(1)

(2)

4.2V (3)

VIN voltage drop and VOUT output voltage

(1) When VIN falls, VOUT cannot overcome the LED “VF” rating, causing insufficient current flows and the

ILED low-current signal becomes active.

(2) When the ILED low-current condition is detected, the VOUT output circuit switches to ×1.5 mode (charge

pump mode).

(3) Prior to switching to ×1.5 mode, the VOUT voltage may be lower than 4.2V but sufficient current is sup-

plied to the LED.

If after startup, the LED connected to a DIN pin is switched, the LED connection detector circuit flags an error,

and correct mode switching may not occur. If the DIN pin does not control the LED drive current, the low-cur-

rent detector does not operate and the device cannot switch to ×1.5 mode.

NIPPON PRECISION CIRCUITS INC.—12

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