APPLICATION NOTE | AN42 |
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Guidelines for Debugging and Performance Evaluations
Debugging Your First Design Implementation
Use the following procedure to help you debug your design implementation:
1.Note the VID pins settings. They tell you what voltage is to be expected.
2.Do not connect any load to the circuit. While monitoring the output voltage, apply power to the part with current limiting at the power supply. Do this to make sure that no catastrophic shorts occur.
3.Ιf proper voltage is not achieved, follow the procedures in the Troubleshooting section.
4.After there is proper voltage, increase the current limit- ing of the power supply to 16A.
5.Apply load at 1A increments; an active load (HP6060B or equivalent) is suggested.
6.In case of poor regulation, refer to the procedures in the Troubleshooting section.
Troubleshooting
1.If no voltage is registered at the output and the circuit is not drawing current, look for openings in the connec- tions. Check the circuitry versus the schematic, and the power supply pins at the device to ascertain that volt- age(s) had been applied.
2.If no voltage is registered at the output and the circuit is drawing excessive current (>100mA) with no load, check for possible shorts. Trace the path of the excessive current to determine if the controller is at fault or if the excessive current is due to peripheral components.
3.If the output voltage comes near to, but is not, what is expected, check the VID inputs at the device pins. The part is factory set to correspond to the VID inputs.
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