ZHCSJM3B April 2019 – January 2020 TPS92613-Q1
PRODUCTION DATA.
The TPS92613-Q1 device has LED short-to-GND detection. The LED short-to-GND detection monitors the output voltage when the output current is enabled. Once a short-to-GND LED failure is detected, the device turns off the output channel and retries automatically, regardless of the state of the PWM input. If the retry mechanism detects the removal of the LED short-to-GND fault, the device resumes to normal operation.
The TPS92613-Q1 monitors the V(OUT) voltage and compares it with the internal reference voltage to detect a short-to-GND failure. If V(OUT) falls below V(SG_th_falling) longer than the deglitch time of t(SG_deg), the device asserts the short-to-GND fault and pulls low the FAULT pin. During the deglitching time period, if V(OUT) rises above V(SG_th_rising), the timer is reset.
Once the TPS92613-Q1 has asserted a short-to-GND fault, the device turns off the output channel and retries automatically with a small current. During retrying the device sources a small current I(retry) from IN to OUT to pull up the LED loads continuously. Once auto-retry detects output voltage rising above V(SG_th_falling), it clears the short-to-GND fault and resumes to normal operation.