This pin serves as a global control. If the logic is low, internal power is disconnected from the VDDP pin, effectively disabling all functions as a primary safety or power-saving measure. Summary of Fault Protections Protection Type Trigger Condition Resulting Action Open Lamp Secondary voltage exceeds limit without current flow. Controller enters shutdown or limits voltage. Short Circuit ISNS voltage for 256 clock counts. Fault latch is set; IC shuts down. Time-Out Strike interval exceeds time set by CTOcap C sub cap T cap O end-sub capacitor. IC stops trying to strike the lamp.
| State | PROT Pin Voltage | IC Outputs (PWM) | |---|---|---| | Normal | ~5V | Switching | | Fault detected (first few cycles) | ~5V (no change) | Switching | | Fault confirmed | 0V | Hi-Z (off) | | After ( V_CC ) reset | ~5V (rising edge) | Switching resumes | lx1692 protection pin
To ensure proper operation, the LX1692 Protection Pin should be connected to a voltage source or a dedicated circuit that can detect the output voltage and provide the necessary feedback to the IC. This pin serves as a global control
Monitors the voltage level to trigger over-voltage protection if thresholds (typically around ) are exceeded. pdf.ic37.com Disabling Protection (Repair Context) Controller enters shutdown or limits voltage
This highlights the pin's importance. If a technician disconnects the Protection Pin from the external sensing circuitry, they remove the "judge" from the courtroom.