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SM8135BB Scheda tecnica(PDF) 8 Page - Nippon Precision Circuits Inc

Il numero della parte SM8135BB
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

SM8135BB Scheda tecnica(HTML) 8 Page - Nippon Precision Circuits Inc

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SM8135B
SEIKO NPC CORPORATION —8
Immediately after startup, the device operates in
×1.5 mode for a fixed interval (soft start time: approximately
1.43ms) to set the current for LEDs connected to the DIN pins. After the soft start time has elapsed, the LEDs
are turned ON. Approximately 2ms is required for the LED drive current to reach the set drive value.
(1) If the EN signal is input after power is applied, the soft start time begins on the EN rising edge. The DIM
pulse input for dimming is active during the soft start time.
(2) After the soft start time (1.43ms) has elapsed, the LEDs are turned ON. Approximately 2ms is required for
LED drive current to reach set values.
Switching to Standby Mode
The SM8135B switches from
×1.0/×1.5/×2.0 mode to standby mode if EN goes LOW and stays LOW for an
interval of 1.00ms (typ). This function is used to switch the internal circuits to standby mode automatically
when the LEDs turn OFF in order to reduce current consumption.
I
If EN is LOW for longer than the enable hold time of 1.00ms (typ), the SM8135B switches to standby mode.
In standby mode, the internal circuits are reset, hence the drive current settings must be re-entered to restart
the device.
Soft start time and LED current
Switching to standby mode, and EN hold time
EN input signal
LED current
(1)
(2)
typ: 1.43ms
Soft start time
LED ON
typ: 2ms
CE hold time
typ: 1.00ms
EN
LED current
1.0 or 1.5
Standby
mode


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