To perform a double pulse test using the Allegro APEK85110 Demonstration Board, follow these detailed steps:
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Setup and Safety:
Begin by ensuring the board is de-energized and all components are fully discharged before handling. Apply a voltage of VDRV = 12V to the board. If not utilizing external Enable control, link the EN_PU and EN pins. Input gate signals, incorporating suitable dead time, should be applied to the IN_L and IN_H inputs. Always prioritize safety; consult the user manual for all safety guidelines and precautions.
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Double Pulse Test Configuration:
In this configuration, the low-side switch receives two pulses, while the high-side switch can either remain off or be driven with the inverse of the low-side gate switch signal. Place an inductor in parallel with the high-side switch to establish the test current level in the low-side switch. During the test, carefully monitor the inductor current levels.
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Test Execution:
Regulate the duration of each pulse to prevent excessive inductor current levels. Use the falling edge of the first pulse to evaluate the hard turn-off characteristics of the switch. Similarly, the rising edge of the third pulse is crucial for analyzing the hard turn-on characteristics of the switch. Keep the switches on only for a brief period to prevent overheating.
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Monitoring and Analysis:
Use the conveniently placed test points on the Allegro APEK85110 Demonstration Board to monitor the high- and low-side gate drives and the switch node voltages. Use an oscilloscope to capture waveforms and properly analyze the switching behavior of your power switches.
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Safety Reminders:
Continuously monitor voltage, current, and component temperatures to avoid damage to the device. Adhere to all safety protocols as described in the user manual to ensure safe operation throughout the double pulse test.
By following these instructions, you can successfully and safely use the Allegro APEK85110 Demonstration Board for performing double pulse tests and analyzing power switch characteristics.
