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SM8133B

White LED Driver IC

Nippon Precision Circuits  

SM8133B

For example, if the VIN voltage is low and the VOUT output voltage in ×1.0 mode does not provide sufficient

drive current, then the mode reset will cause a LED undercurrent condition. The LED undercurrent detector

circuit will output an LED undercurrent signal immediately after the switch to ×1.0 mode, but the output will

stay in ×1.0 mode and not return to ×1.5 mode for the duration of the mode hold time. Consequently, the VOUT

output is not boosted during the 85µs (min) to 200µs (max) mode hold time and the voltage drops and the LED

brightness is reduced. However, the LEDs are OFF for a maximum of 200µs only, and this is not discernible to

the naked eye and thus is not a problem.

VIN input voltage

Mode reset

(1.4sec/cycle)

Mode hold

(H: hold)

VOUT mode

(H: 1.5, L: 1.0)

VOUT

output voltage

Low ILED detector

(H: low ILED)

1.4sec

max

200µS

1.0 1.5 threshold

5.0V

VOUT drop due to the mode reset single

SEIKO NPC CORPORATION —17

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