LM76002-Q1: Can you simulate the Loop response of very low load current

Hi Andy

I would like to simulate a loop respond at 10mA by light load mode. Can I do that by Webench? Do you have an other way to simulate it other than Webench?

Best Regards,
Fujiwara

Hi Andy,

You mean I should try to simulate loop response of PFM at light load by PSPICE for TI? If so, could you please provide simulation schematic? I'm not sure how to simulate it with PSPICE for TI.

Best Regards,
Fujiwara

Hi Fujiwara,

What's target Vin, Vout and FSw? 

I will try to measure it on EVM for better accuracy.

B R

Andy

Hi Fujiwara,

Pls provide target Vin, Vout and Fsw, so I can measure it on EVM for better accuracy.

B R

Andy

Hi Andy,

Sorry for late response.

Here is target values.
- Vin = There are two cases, one is typ=28.5V. Another one is Typ=13.8V
- Vout = 3.7V
- Fsw = 400KHz

Also customer would like to know transient response when Vin is changed 4.5V to 36V and 36V to 4.5V. (Auto mode) Could you please measure it?

Best Regards,
Fujiwara

Hi Fujiwara,

Below is measured on LM76002EVM:

Input line transient: 4.5V to 36V @ 10V/ms

Ch1=Vin, Ch3=output ripple

B R

Andy

Hi Andy,

Thank you very much! Could you please send a measurement schematic? Regarding the measurement result of phase/gain margin, I think it has enough margin. Is my understanding correct?

Also customer requests to measure a followings. Would you please measure them by EVM?
1. Output voltage transient response (Io changes from 10mA to 1A and from 1A to 10mA)
2. Phase margin (Io=1A)

Your support would be much appreciated.
Best Regards,
Fujiwara