Other Parts Discussed in Thread: , TPS1HB16-Q1, TPS27SA08, TPS1663
Hi there,
I'm Zeming, FAE at TI Japan.
My customer is evaluating TPS27S100A using TPS27S100AEVM. He used an external resistor to set the current limit as 4A, and set load current as 1.5A⇔5.5A with 2A/us slew rate. Output was connected to a CR mode electronic load.
As you can see below, the current rose to 5.27A with almost no current limit. Was the current slew rate too fast so that the current limit could not work normally? If so, how long is the response time of current limit?
Also, when he tried the condition of VIn=24V, Iout=3.3A(continues) with CR mode electronic load, thermal shut-down occurred. Output voltage and current was clamped to 50%, and ON/OFF operation happened repeatedly.
I calculated the junction temp using the thermal resistance, but it seems to be not beyond the TSD temp. Why did this happened? and what is the largest continues current when Vin=24V?
I would appreciate it if you could help!
Regards,
Zeming Kong