TPS51200-Q1: How to test sink current of 51200

Amelie Zheng

Genius 10865 points

Part Number: TPS51200-Q1
Other Parts Discussed in Thread: TPS51200, TPS51200EVM

Hi team,

May I ask how customer could test TPS51200-Q1 sink current?

over 3 years ago

0 yihe over 3 years ago

TI__Guru 60800 points

The TPS51200 EVM guide has a instruction and circuit to demonstrate how to sink/source current

https://www.ti.com/lit/ug/sluu323/sluu323.pdf?ts=1635598191635&ref_url=https%253A%252F%252Fwww.google.com%252F

regards

yihe

0 Kadeem Samuel over 3 years ago

TI__Genius 15350 points

Amelie,

To test sinking current, what you can do is something similar to the TPS51200EVM, where you connect a higher voltage source to the VTT output with low-value high-power resistors. On the EVM we use parallel 1.5ohm 1W resistors to accomplish this.

So, if you wanted to sink 1A of current with a 0.75 VTT and a 1.5V VLDOIN, you can connect VLDOIN to VTT with two parallel 1.5ohm 1W resistors.

It is important that these resistors have a high power rating due to the large V=IR drop across the resistors, which is why we recommend using parallel resistors.

Thanks,

Kadeem

Power management

Power management forum

TPS51200-Q1: How to test sink current of 51200