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The part is marketed as a "10 A" Half-bridge power module. Yet, the abs. max. rating mention 10 A as the unconditional switch node current, which would turn it rather into a "5-6 A" half-bridge module when accounting for realistic transient safety margins.
Currently, I am having difficulty during design to keep the startup current below 10 A in a 50 V application into a 4.7 µH inductor, even when carefully ramping up the duty cycle at fSW ~ 1 MHz. The current is often seen to peak to ~15 A for about 100 µs.
Is this "10 A" max. rating to be understood as a DC thermal destruction figure ? The datasheet gives no SOA for transient currents.
My gut feeling is that this is absolutely usual and even fine thermally, but it is a step over the abs. max. ratings, so I thought I'd ask here for an opinion...
Hello Lutz,
Exceeding 10A during transients is not a problem; you could go significantly higher than the 15A you mention if needed.
There's a few limits on the device max current:
1. Thermal. Generally not an issue for transients (excluding shoot through)
2. Electro migration. Definitely not an issue for transients. This is where the 10A datasheet limit comes from.
3. Inductive energy / ringing. Can be an issue for transients, depending on Vin, Iout, & layout.
Thanks,
Travis