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Using DRV595 to drive a TEC

Steve Trani
Prodigy 115 points
Other Parts Discussed in Thread: DRV595

We're using the DRV595 eval board to drive the TEC of a sensor.  That TEC requires +8.5V.  When this voltage is applied to the chip and the chip is turned on, the voltage amplitude will change depending on the differential input as expected.  However the outputs do not seem to be switching and the load current is not acting as expected.  It's as if the H-bridge is turned on in only one direction, which becomes very inefficient.  When the two inputs are similar, the output will oscillate and appear sinusoidal.

Are we using the DRV595 correctly?  Is there a way around this problem?

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    TI__Guru**** 189399 points

    Hi, Steve,

    Sorry for the delay in getting back to you.

    The DRV595 was, in fact, developed to drive TEC elements.

    You need to DC-couple a differential voltage across the IN+ and IN- terminals on the EVM. The differential voltage times the gain setting will result in x volts across the outputs. The outputs can be set up to both heat and cool, depending on the polarity of the differential input signal.

    Let me know if this doesn't clarify the situation for you.

    -d2