LT8361 Output Voltage Stuck at 13V

Hello Kuremiya,

If the boost converter does not produce the expected output voltage, please check the following points:

1) Is the load condition appropriate?
If the load current is higher than expected, the output voltage may not be able to rise to the specified value.
Please check whether the output voltage reaches the expected value under a lighter load condition.

2) Is the FBX pin voltage 1.6 V?
Under normal operating conditions, the FBX pin voltage should be 1.6 V.

3) Is the switching frequency as expected?
The switching frequency can be verified by observing the waveform at the SW pin.

4) Is the inductor current below the saturation current rating of the inductor being used?
Please refer to the inductor datasheet for its saturation current specification.

5) Does the laboratory power supply have sufficient current capability?
Please ensure that the power supply can provide the current required for proper boost converter operation.

Regarding the PCB routing error you mentioned, it should not cause any permanent damage if voltage applied to each pin did not exceed the Absolute Maximum Ratings during the event.

When modifying the PCB routing to the FBX pin, please keep the trace as short as possible. Excessive trace length may affect performance, for example by making the feedback node more susceptible to noise pickup.

As a reference, you may also use our free LTspice circuit simulator to verify whether the circuit operates correctly before making hardware changes.

https://www.analog.com/jp/resources/design-tools-and-calculators/ltspice-simulator.html

Regards,
 

Hello Kuremiya,

If the boost converter does not produce the expected output voltage, please check the following points:

1) Is the load condition appropriate?
If the load current is higher than expected, the output voltage may not be able to rise to the specified value.
Please check whether the output voltage reaches the expected value under a lighter load condition.

2) Is the FBX pin voltage 1.6 V?
Under normal operating conditions, the FBX pin voltage should be 1.6 V.

3) Is the switching frequency as expected?
The switching frequency can be verified by observing the waveform at the SW pin.

4) Is the inductor current below the saturation current rating of the inductor being used?
Please refer to the inductor datasheet for its saturation current specification.

5) Does the laboratory power supply have sufficient current capability?
Please ensure that the power supply can provide the current required for proper boost converter operation.

Regarding the PCB routing error you mentioned, it should not cause any permanent damage if voltage applied to each pin did not exceed the Absolute Maximum Ratings during the event.

When modifying the PCB routing to the FBX pin, please keep the trace as short as possible. Excessive trace length may affect performance, for example by making the feedback node more susceptible to noise pickup.

As a reference, you may also use our free LTspice circuit simulator to verify whether the circuit operates correctly before making hardware changes.

https://www.analog.com/jp/resources/design-tools-and-calculators/ltspice-simulator.html

Regards,