Diode Turn-On Time Induced Failures in Switching Regulators
by Jim Williams and David Beebe, Linear Technology, Vendor website, Jan 01 2009
Focus:
When switching regulators operate at very high switching frequencies (above 1 MHz), diode turn-on time becomes a potential liability. Though diode turn-on may only take nanoseconds, even that short delay may be enough to produce a transient "overshoot" across the diode that can cause the switching regulator IC to fail. To prevent this, the diode needs to be qualified for the application by measuring its turn-on overshoot voltage using the procedures described here.
What you’ll learn:
- How to measure diode turn-on time to qualify a diode for use with a switching regulator IC
- How to generate pulses with sub-nanosecond rise times
Notes:
Linear Technology Application Note 122
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