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SM8135B

White LED Driver IC

Nippon Precision Circuits  

SM8135B

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.

EN input signal

(1)

Soft start time

typ: 2ms

LED current

typ: 1.43ms

(2)

LED ON

Soft start time and LED current

(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.

EN

LED current

CE hold time

typ: 1.00ms

1.0 or 1.5

Standby

mode

Switching to standby mode, and EN hold time

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.

SEIKO NPC CORPORATION —8

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