The AP3064M-G1’s protection pin (Pin 2) is a powerful, often overlooked feature that transforms a basic LED driver into a safety-critical component. By understanding its latch-off behavior, threshold voltage (1.24V), and proper interfacing with NTCs, voltage supervisors, or open-drain outputs, you can prevent catastrophic failures due to overheating, over-voltage, or external system faults.
This is the primary protection pin. When the voltage at this pin exceeds 2.0V , the OVP is triggered, and the power switch is immediately turned off. If an abnormal condition occurs where the OVP voltage exceeds 3.2V , the IC will latch into a shutdown state, requiring the EN pin to be toggled for a restart. ap3064m-g1 protection pin