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| TLC5957 Datasheet, PDF (16/25 Pages) Texas Instruments – TLC5957 48-Channel, 16-Bit ES-PWM LED Driver with Pre-Charge FET, LED OPEN Detection and Caterpillar Cancelling | |||
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TLC5957
SLVSCQ4 â OCTOBER 2014
www.ti.com
9.3.10 IREF Resistor Short Protection (ISP)
The Iref resistor short protection (ISP) function prevents unwanted large currents from flowing though the
constant-current output when the Iref resistor is shorted accidently. The TLC5957 turns off all output channels
when the Iref pin voltage is lower than 0.19V (typ). When the Iref pin voltage goes higher than 0.33V (typ), the
TLC5957 resumes normal operation.
9.3.11 Noise Reduction
Large surge currents may flow through the IC and the board on which the device is mounted if all 48 LED
channels turn on simultaneously at the 1st GCLK rising edge. This large surge current could induce detrimental
noise and electromagnetic interference (EMI) into other circuits.
The TLC5957 separate the LED channels into 12 groups. Each group turns on sequentially with some delay
between one group and the next group. By this means, a soft-start feature is provided and the inrush current is
minimized.
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