TPS63000EVM-148

There are several papers for this application.

http://www.ti.com/lit/an/slva419b/slva419b.pdf

http://www.ti.com/lit/ug/slva268/slva268.pdf

A similar device, TPS63030, has an EVM you can order for our eStore. 

http://www.ti.com/lit/ug/slvu391/slvu391.pdf

http://www.ti.com/tool/tps63030evm-658

Try some of these out and if you are still having issues don't hesitate to contact us back. 

Hello Michael,

Thanks for your advise. We have tried out TPS63030EVM-658 but somehow we only can obtain the constant current output within 3.6Vin ~ 5.5Vin.

Is there anyway can configure so that we can get constant current output within 2.7Vin ~ 5.5Vin ? 

Your prompt attention is much appreciate.

Thanks,

- Koay

Hi Koay, 

It looks like you reached the minimum Vin limit at which the device can supply the Iout at desired Vout. Thus, there is nothing you can do about the limited Vin range. Try using your TPS63000 EVM and make similar modifications to that of the TPS63030EVM-658. Using the TPS63000, you should be able to reach a much higher level of output current at the same level of Vin than if using the TPS63030. But, the circuitry idea is still the same. 

Hello Michael,

Thanks for your feedback.

I will try to replace TPS63000 IC into TPS63030EVM-658 board.

But my concern still is whether I can get constant output current within 2.7Vin ~ 5.5Vin if I am using TPS63000?

Thanks.

- Koay

Koay, 

It might be more easier to make the TPS63030EVM-658 changes on the TPS63000 EVM than  to put the IC onto the TPS63030EVM-658. But, either way will allow you to test. There is a reference design for the TPS63000 as an LED driver. 

http://www.ti.com/lit/ug/slva268/slva268.pdf

Both, designs will provide constant current to the load LED. This is done by FB and the Rsns resistor. On the TPS63030EVM-658, the Rsns is R3 and on the TPS63000 LED Driver reference design R3 and R4 are the Rsns. Thus the push button allows the user to double the driving current on the TPS63000 reference design. 

The user guides provide over detail on each of their operation and design.