DC-DC Buck Step down, PMBus, 5-14V adj, ~10A, with V, I reporting for Thermoelectric Cooler

Hi Ashim,

I think there is no a full integrated device can meet this requirement. you may need a DSP and four full bridge structure to control each TEC. 

the DSP can handle the communication, voltage and current sensing can use DSP ADC + amplifer.

Hi Jasper,

What you are suggesting is way overkill.  I believe good engineering is to achieve objectives with simple, elegant and less expensive designs, even if we need to make slight compromises that don't hurt the main goal.

The only thing needed in the above is a higher voltage version of any chip from the CSD954xx family.

I'll keep searching.

Thanks for trying

Hi Ashim,

OK. maybe you can try to look at the audio amplifier device. OPAxxx series

http://www.ti.com/amplifier-circuit/op-amps/audio/products.html#p378typ=0.000006;0.00005

Audio amplifiers ?????    You are probably responding to some other thread?!   I never asked about audio amps.

Hi Ashim,

please refer to this application note http://www.ti.com/lit/an/snaa092/snaa092.pdf

and the datasheet of the DRV591

http://www.ti.com/lit/ds/symlink/drv591.pdf

I doesn't know much about audio amplifier. but it seem this kind of device can use to drive TEC.

Hi Jasper,

This will not work.  In my first post here, please see my requirements about V and I in addition to reporting back to host.

BTW, I had asked the same question to Linear Tech / Analog Devices, and they came back with almost a perfect match - LTC3889.  It has dual supplies so I will need to use two such parts per unit, but if they had a quad IC it would have worked even better.

If you something similar and cheaper, even with fewer features, that could work well for me.  TI has some parts that have PMBus interface in the Power Management category -- and they use an external power stage.  However, I could not find the correct specs for my app.

Thanks

hi Ashim,

it seem like buck converter. how do you generate negative voltage for the TEC? or you don't need negative voltage in this application?

At least 2 ways to get +/- supplies using LTC3889 --

1. Use two external half H-bridges to form a full H-bridge.  The LTC will supply power to the H-bridge which has the Peltier. 

OR

2. Connect two supply sections in the LTC3889 back to back to form an H-bridge.  Some minor mods would also be needed to achieve this.

Hi Ashim,

if you form a full bridge, the device need to support revert current. but I didn't see this in the datasheet. 

Hi Jasper,

Would it be possible to use one of the buck-boost controllers, with a TEC connected between input and output like in this reference design?

http://www.ti.com/lit/ug/tiduca8/tiduca8.pdf

For example the LM5175 in CCM mode?

Best regards,
Milos

Jasper Li said:

if you form a full bridge, the device need to support revert current. but I didn't see this in the datasheet.

Please see example H-bridge formed by two sides of an LTC3889.  The negative side sinking current would need to keep the lower MOSFET (M3 or M4) ON.  If that is not doable through software command to the LTC3889, then it can easily be done by applying a high signal at the gate ("ORed" together) while keeping that side essentially off through software.  Make sense?

Hi Milos,

the LM5175 may not support current back into the VOUT. it is not the design target of this device. I'm afraid there could be many issues in such application. 

Milos said:

Would it be possible to use one of the buck-boost controllers, with a TEC connected between input and output like in this reference design?

http://www.ti.com/lit/ug/tiduca8/tiduca8.pdf

For example the LM5175 in CCM mode?

Two points--

1. I need I2C like SMBus or PMBus interface

2. Input V would be around 24VDC, output needs to be programmable from say 1VDC to 15VDC.  Current up to 15A.  Phase interleaving and synchronization between other parallel units required since 4 units would work in tandem.

TPS65400 gets close but doesn't meet power specs.

Hi Ashim,

i agree with you. it seem to be possible if the M3 or  M4 can be always on.

i'm not sure if TI has similar device as I only support boost.

could you re-build a post with title, such as a device with similar function as LTC3889. you may share the concept presented. so the responsible expert for such a device could see the request and easily understand what you need.