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These are the Short Circuit Protection pins for channels 1 and 2. They connect to external capacitors that determine the Timer Latch duration. If a fault is detected, the IC waits for the capacitor to charge before latching into a shutdown state.
. While specific bypass methods vary by board design, common techniques involve: Connecting a resistor (often ) from the protection pin to ground.
| Step | Action | Expected Result | | :--- | :--- | :--- | | 1 | Measure voltage on protection pin relative to GND. | Normal: ~VREF (e.g., 5V). Fault: <0.8V. | | 2 | Disconnect load and measure output. | If output rises, load OCP is the issue. | | 3 | Check voltage across current sense resistor during startup. | Should be < threshold (e.g., 100mV). | | 4 | Temporarily lift the protection pin from PCB (if possible). | If IC starts, the external fault circuit is pulling it low. | | 5 | Measure TIMER pin (Pin 8) voltage. | Should be ramping if in hiccup mode; steady if latched. | bd9766fv protection pin
| Mode | Behavior | Reset Condition | | :--- | :--- | :--- | | | Upon fault, the IC shuts down the output driver (PWM stops). The protection pin latches low. | Cycle input power (VCC) or pull reset pin high. | | Hiccup Mode (Timed) | The IC periodically attempts to restart. The protection pin toggles with the timing capacitor on Pin 8. | Fault removal + timing cap discharge. |
. Operating a faulty inverter without protection can lead to permanent component damage or fire hazards. for a specific TV model using this IC? BD9766FV - Mouser Electronics These are the Short Circuit Protection pins for
The BD9766FV protection pin offers several benefits, including:
Short Circuit Protection timer latch for Channel 2. | Normal: ~VREF (e
External thermistors or temperature switches can be tied to the PROT pin using an open-drain/collector configuration. If an over-temperature event occurs, the external device pulls the pin low (or high, depending on topology), triggering the latch.
In repair scenarios where the backlight flashes then turns off, technicians often focus on