TPS61099: How to determine switching frequency

Hi Please refer to this equation to calculate.

Hi, Nini

When the load is light, it will be PFM mode, but I understand that there is no formula for this. We are concerned about other circuits being affected by the low switching frequency during light load (no load, etc.). Is there no way to check the approximate frequency in PFM mode?
We are currently in the device selection stage and cannot test in the lab. Do you have any suggestions including other devices?

Thanks,

Conor

You can choose other products that support force PWM, just search on ti.com and choose FPWM. I don't take charge of the FPWM device. So can't help too much about this. 

Hi Nini,

I would also consider forced PWM.
When using the TPS61099 or TPS61299, is there any way (simulation, etc.) to determine anything about the frequency when in PFM mode other than experimenting with EVM in the lab?

Thanks,

Conor

Actually we don't have any better ideas.

Hi Nini,

I would also like to consider the TPS61033 in forced PWM mode.
I would like to ask an additional question regarding the use of PFM mode products. The load current is expected to be several uA to several tens of uA, but the switching frequency will be considerably lower, and we are concerned about unstable operation. Could you let me know if there is a recommended minimum load current, etc.?

Thanks,

Conor

For TPS61033 I'm not so familiar, but you can submit another tickets for further discussion about the details about the products. However normally there isn't minimum load current for converters. You shouldn't worry about this.