Hi, I want to control a peltier element with an arduino and I'm not sure which transistor or MOSFET would fit my circuit.

The power comes from a LiPo-Battery with 3,7V and powers the arduino (Pro Micro 3.3V) and the peltier, if triggered.


The data sheet values of the peltier are these: 2.2V, 1.2A, 1.5W, 1.56Ohm

By now I used a TIP120 MOSFET with an additional 10k resistor from the Base to GND. And the peltier is in between the Collector and V+ of the battery. But I want to reduce the size of the circuit and I'm not sure which transistor would suit.

Thanks for an advice.

 

Hi,

The Peltier is only 2.2v? That sounds kind of low. Can that run on nearly 4v?

But anyway, you look for a transistor that can handle the collector current of 1.2 amps and has low enough sat voltage so that it does not dissipate too much heat. You can get mosfets that have low Rds so that makes sense. You'd want low Vsat with a bipolar so look for a low sat voltage at 1.2 amps. A mosfet would probably be a better choice.

 

Yes the peltier is settled on 2.2v. it's a hightech element and only 6x6mm big.
So i.e. a n-channel MOSFET IRLD014PBF with I_d=1.7A, U_DSS=60V, R_DS=200mOhm and P_tot=1.3W would suit? Or is the voltage still to high?

 

PWM ..