To perform a double pulse test using the Allegro APEK85110 Demonstration Board, follow these steps:
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Preparation: Before you begin, make sure the board is de-energized and all components are fully discharged. Apply a 12V voltage (VDRV) to the board. If you're not using external Enable control, link the EN_PU and EN pins. Connect input gate signals with the proper dead time to the IN_L and IN_H inputs.
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Test Setup: In a double pulse test, the low-side switch receives two pulses. The high-side switch can either remain off or be driven with a signal inverse to the low-side gate switch. Place an inductor in parallel with the high-side switch to establish the test current level in the low-side switch. Monitor the inductor current during the test.
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Test Execution: Keep the duration of each pulse short to prevent excessive inductor current. Examine the switch's hard turn-off characteristics using the falling edge of pulse 1. Use the rising edge of pulse 3 to analyze the hard turn-on characteristics. The goal is to keep the switches on for a limited duration to avoid overheating.
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Monitoring and Analysis: Use the test points available on the board to monitor high- and low-side gate drives and the switch node voltages. Use an oscilloscope to capture waveforms and analyze the power switches' switching behavior.
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Safety First: Always adhere to the safety procedures outlined in the user manual to avoid injury or damage. Pay close attention to voltage, current, and component temperatures during operation to prevent any device damage. Following these steps will help you safely and effectively evaluate the Allegro APEK85110 Demonstration Board's power switch characteristics through a double pulse test.
