TPS63070: TEC controller boost-buck or driver

Hi,

as the Volt-Ampere characteristics of TEC is almost same with resister as below. could you tell me why another CC converter is needed?

because with this V-A curve，a CV converter is same with CC converter. so i thing just one CV converter is enough.

attachment is an App note for TEC. with one CV converter only.

TEC Driver.pdf

Regards

Tao

Hi Tao,

What do you mean with another CC. I want to use one CV converter as this is more efficient according to:
Driving a Peltier Element (TEC): Efficiency and Aging (Rev. A)

I want to use this in a battery powered circuit.

If I were to connect to a 3s LiPo the maximum potential difference would be around 12-2.5=9.5[V] If this is used with the maximum Iout of 2[A] we get 9.5*2 = 19[W]. I'm wondering if this could be increase to 12*2=24[W].

Your suggestion with the 3V3 input and 5V output. will be 1.7*2=3.4[W] (2A out) right?

Will this not result in that the 19[W] will be more powerfull and faster in cooling and heating?

Hi  Luc,

Sorry for the misunderstanding, i thought the CV converter is used to drive the CC converter next.

The App note is just want let you know one CV converter is enough,  my mistake. So please ignore the attachment and let us back to TPS63070.

i am afraid the cooling and heating power will smaller than your expect because there is a negative current limit as below.

when input is 12V and output is 2.5V,  the power is limited by the current limit and the maximum power on TEC will smaller than 12*1.1*Eff.

actually, for most converter or controller, the positive and negative current limit always very different, which means with one converter, you almost can not the same cooling and heating power.

yeah, i think a CC or CV converter with H brige is more suitable for you.

Regards

Tao

Hi Tao,

Great, thank you!

Do you mind if we keep this topic open so I can share a design later? Or would it be better to create a related question?
I'm thinking of creating an evaluation board with two or more options of converters.

Hi  Luc,

yeah,  i am ok and i will click "waiting for customer" to wait your update.

Regards

Tao

Hi Tao,

I was looking for a high-current H-bridge, but notices that i'm only able to find drivers which are controlled via a PWM instead of H-bridge that I can control myself.

Is there no convenient package that holds an H-bridge that can simply control the direction (needs to be high-current as it will be continuous) instead of a PWM.

I can build the H-bridge with MOSFETs but if there is a less board-space solution, that would be interesting.