ZHCSLS0B July 2022 – April 2024 TPS929240-Q1
PRODUCTION DATA
請參考 PDF 數據表獲取器件具體的封裝圖。
The TPS929240-Q1 has internal analog comparators to monitor all channel outputs with respect to a fixed threshold for reporting OUTXn short to GND fault in FAIL-SAFE state.
The short-circuit detection is only effective during PWM-ON state with programmable minimal pulse width of t(BLANK) + t(SHORT_deg). The t(BLANK) is programmable by register BLANK. If PWM on-time is less than t(BLANK) + t(SHORT_deg), the device cannot report any short-circuit fault.
When the voltage V(OUTXn) is below threshold V(SG_th_rising) with duration longer than deglitch timer length of t(BLANK) + t(SHORT_deg), the device pulls ERR pin down with constant current sink to report fault and set flag registers including FLAG_SHORTOUTXn, FLAG_OUT and FLAG_ERR. In FAIL-SAFE state, the TPS929240-Q1 shuts down the normal current regulation and PWM duty cycle for the faulty output, then the device sources a pulse current to faulty output every t(SLS_Retry), 10 ms for retrying. I(RETRY) is programed by IRETRY register. Use Equation 8 to calculate the current, I(RETRY). When the voltage V(OUTXn) of error output rises above threshold V(SG_th_falling) with duration longer than t(BLANK) + t(SHORT_deg), the device automatically resumes the normal current and PWM dutycycle setup and releases the ERR pin.
The fault is latched in flag registers. When the short-circuit failure is removed, the master controller must write 1 to CLRFAULT to clear FLAG_OPENOUTXn, FLAG_OUT and FLAG_ERR. The CLRFAULT bit automatically returns to 0.