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SM8136A Scheda tecnica(PDF) 10 Page - Nippon Precision Circuits Inc

Il numero della parte SM8136A
Spiegazioni elettronici  White LED Driver IC
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Produttore elettronici  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8136A Scheda tecnica(HTML) 10 Page - Nippon Precision Circuits Inc

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SM8136A
SEIKO NPC CORPORATION —10
A mode hold signal of 200
µs (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 200
µs (max) mode hold time. However, a 200µs decrease in the brightness is not a problem as it is not
perceptible to the human eye.
VOUT drop due to mode reset signal
Mode reset
(1 sec/cycle)
Mode hold
(L: hold)
Low ILED detector
(H: Low ILED)
VOUT voltage
VIN voltage
1.0sec
5.0V
max
200
µS
VOUT mode
(H: 1.5, L: 1.0)
1.0
1.5 threshold


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