UCC21530-Q1: Peak value and minimum duty cycle about UCC21530-Q1

chengdp

Prodigy 70 points

Part Number: UCC21530-Q1
Other Parts Discussed in Thread: UCC21530

Hi team:

The UCC21530-Q1 was failed On our customer side.We have below questions which our customer is also concerned about.

We need to confirm the peak current value which is allowed from OUTA and OUTB, and how long it can last.
We want to know the minimum duty cycle from OUTA and OUTB,which the pulse wii not missed.

over 1 year ago

0 Krystian Plaskota 12 months ago

TI__Expert 4065 points

Hi,

I will get back to you about the first question by tomorrow, but for the second one, I am not sure I understand what you mean. Are you asking what the minimum pulse is on the input to get an output? The input pulses shouldn't be less than 10ns as this is the minimum pulse width of the output.

0 Krystian Plaskota 11 months ago in reply to Krystian Plaskota

TI__Expert 4065 points

The peak current for the UCC21530 is 4A source and 6A sink for both channels. The gate driver's output stages delivers the highest peak-source current during the miller plateau region of the power-switch. We have an app-note that explains how to understand the gate driver's current source and sink spec here: https://www.ti.com/lit/an/slla387a/slla387a.pdf

In the UCC21530 datasheet, the relevant text for explaining the internals of the output stage is 8.3.4, and 9.2.2.3 provides the equations for calculating the source and sink current:

https://www.ti.com/lit/ds/symlink/ucc21530.pdf

Regards,

Krystian

Power management

Power management forum

UCC21530-Q1: Peak value and minimum duty cycle about UCC21530-Q1