ZHCSLM3B August 2020 – May 2024 LP8864-Q1
PRODUCTION DATA
When the EN pin is pulled low, the device stops the boost controller and LED current sinks, turns off the power-line FET, and starts to discharge the boost output. The discharge pin typically sinks 30mA current. The discharge duration is 400ms. After 400ms, the device shuts down. The DISCHARGE pin must be connected with boost output for normal operation.
There is one internal comparator to monitor the voltage of DISCHARGE pin. As soon as the voltage of DISCHARGE pin is higher than VBST_OVPH (typically 50V), the device enters into fault recovery mode, and BST_OVPH fault is reported. This provides further protection if boost voltage is out of control because of system failure.
Discharge function is only available in HTSSOP package. It's not available in QFN package.