8.3.7.1 LED Short-to-GND Detection

The TPS92830-Q1 device has channel-independent LED short-to-GND detection. Short-to-GND detection is only enabled during channel on-time. Once an LED short-to-GND failure is detected, the device turns off the faulty channel and retries automatically. If the auto-retry mechanism detects that the LED short-to-GND fault has been removed, the device resumes normal operation. section

The device monitors voltage V_(SENSEx) and compares it with the internal reference voltage to detect short-to-GND failures. If the period during which V_(SENSEx) falls below V_{(SG_th_rising)} is longer than the deglitch time of t_{(SG_deg)}, the device asserts a short-to-GND fault on this channel. During the deglitch time period, if V_SENSEx rises above V_{(SG_th_falling)}, the timer is reset.

If a fault is detected, a constant-current source pulls the fault bus down. If FAULT is low, all devices connected to the fault bus are off in the fault mode.