Ap3064m-g1 Protection Pin __exclusive__

Inside the AP3064M-G1, the protection pin is connected to a comparator with an internal 50 µA current source pull-up to an internal reference (typically 1.24V). When the pin voltage is above 1.24V, the IC operates normally. When the voltage is forced (externally), the IC enters latch-off protection mode .

The AP3064M-G1 mitigates this via the OVP pin. A resistor divider network is connected from the high-voltage output rail to the OVP pin and then to ground. The AP3064M-G1 monitors the voltage at this pin. The internal logic is calibrated to a specific threshold—typically around 1.2V to 1.5V, depending on the specific variant and datasheet revision. ap3064m-g1 protection pin

An open-drain output that indicates the operational health of the LED strings. In many repair scenarios, this pin is used by the system's microcontroller to detect faults and trigger a global shutdown. Inside the AP3064M-G1, the protection pin is connected

A: No. The internal 50 µA pull-up will raise the pin to an undefined level near VCC, but it is prone to noise. Tie it to VCC through a 10k resistor or directly to a stable voltage >1.24V if unused. The AP3064M-G1 mitigates this via the OVP pin

It is best practice to set the OVP trip point approximately 20% to 30% higher than the maximum expected normal operating voltage. If set too close to operating voltage, transient spikes during startup or load changes might cause nuisance tripping. If set too high, the protection may not activate before damage occurs.

The protection pin is sensitive. Add a 10 nF to 100 nF capacitor from PROT to GND to filter high-frequency noise from switching transients. This prevents nuisance tripping.

For maximum safety, use the current sense pin for instantaneous overcurrent protection, and the protection pin for slower thermal or over-voltage events. Do not rely on the protection pin for primary overcurrent—it is too slow.