SLIS178B October 2017 – January 2018 TPS92830-Q1
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 VSENSEx 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.