TPS63802EVM: TPS63802EVM: Efficiency problems.

Katherine Armitage

Part Number: TPS63802EVM
Other Parts Discussed in Thread: TPS63802

Hi,

I am using the TPS63802 in a low power design. I tested the TPS63802 with a power supply for Vin and a constant current load of 5mA.

My measured values are:

Vin	Cin (mA)	Vout	Cout* (mA)	Eff (%)
4.2	4.82	3.329	5	0.822219
3.7	5.7	3.353	5	0.794927
3.2	6.47	3.337	5	0.805883
3	6.95	3.332	5	0.799041
2.5	8.39	3.337	5	0.795471
2	10.64	3.322	5	0.780545

Is there something I need to changed to get the higher efficiency numbers? I was expecting numbers in the 90%.

Thanks

over 4 years ago

0 Minqiu Xie over 4 years ago

TI__Mastermind 21565 points

Hi Katherine:

May I know the setup about your test? Do you use the EVM or not? If not, please share the schematic and inductance spec with us.

We have measured in our lab, and the efficiency is around 90% (Vin>3V, Vout=3.3V, Io=5mA), as shown in datasheet first page.

0 Katherine Armitage over 4 years ago in reply to Minqiu Xie

Prodigy 40 points

Hi,

For the tests I performed above I used the EVM. I have a power supply for Vin. I use a DMM to measure the input current Cin. I have a constant current load of 5mA. And I use that for the Cout and Vout measurements.

How do you test it?

Thanks

Katherine

0 Minqiu Xie over 4 years ago in reply to Katherine Armitage

TI__Mastermind 21565 points

Hi Katherine:

May you share a photo of your setup? Does it connect well?

We use the setup like Figure 1 in the below application note: https://www.ti.com/lit/an/slyt558/slyt558.pdf

0 Minqiu Xie over 4 years ago in reply to Minqiu Xie

TI__Mastermind 21565 points

Hi Katherine:

As long time no hear from you, I assume you have solved the issue. If not, just reply below. Thank you!

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TPS63802EVM: TPS63802EVM: Efficiency problems.