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SM8136A

White LED Driver IC

Nippon Precision Circuits  

SM8136A

A mode hold signal of 200µs (max) duration is output immediately after switching to ×1.0 mode. The VOUT

output is held in ×1.0 mode and any LED drive current insufficient detection signal is ignored during the mode

hold signal output. For example, if the VIN voltage drops and the VOUT output voltage in ×1.0 mode cannot

provide sufficient current to drive the LEDs, a LED drive current insufficient condition occurs momentarily due

to the mode reset. The LED low-current detector circuit outputs a LED drive current insufficient signal imme-

diately after switching modes, but during the mode hold time the device stays in ×1.0 mode and does not

switch to ×1.5 mode. Consequently, the VOUT voltage drops and the LED brightness decreases during the 85µs

(min) to 200µs (max) mode hold time. However, a 200µs decrease in the brightness is not a problem as it is not

perceptible to the human eye.

VIN voltage

Mode reset

(1 sec/cycle)

Mode hold max

(L: hold) 200µS

VOUT mode

(H: 1.5, L: 1.0)

VOUT voltage

1.0sec

1.0 1.5 threshold

5.0V

Low ILED detector

(H: Low ILED)

VOUT drop due to mode reset signal

SEIKO NPC CORPORATION —10

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