TPS63020: tps63020

Minglai Kao

Intellectual 635 points

Part Number: TPS63020
Other Parts Discussed in Thread: TPS63050,

The application note SLVA677 describes using TPS63020 to drive a TEC.

In the boost mode, will the current flow from the VOUT pin into the external DC power supply?

How much current can the Vin pin of this device sink?

Thanks

Ming

over 6 years ago

0 Milos over 6 years ago

TI__Expert 7925 points

Hi Ming,

In boost mode, the current flows from VOUT to VIN through the TEC. In either mode the external DC power supply always supplies current, it never sinks current, otherwise you would have a perpetuum mobile. To see the current flows for buck and boost modes, see the examples from this thread:
TPS63020: Sink current path when used as TEC driver

The limit for the input current is around 4 A.

Best regards,
Milos

0 Minglai Kao over 6 years ago in reply to Milos

Intellectual 635 points

Milos,

Thanks. It is clear.

I tried with a similar one TPS63050 and somehow the inrush current was quite high.

0 Minglai Kao over 6 years ago in reply to Milos

Intellectual 635 points

I just received a TPS63020EVM-487 and tried it.

The output is not steady, fluctuates about 50mV with the power save mode.

The output is stable when it is not in the power save mode.

The voltage is around 3.44V when in the power save mode and 3.29V when not in the power save mode.

The Icc difference is 6mA when no load is connected.

If I want to use this to drive a TEC, anything I need to watch out for?

Thanks

0 Milos over 6 years ago in reply to Minglai Kao

TI__Expert 7925 points

Hi Ming,

In power save mode the output voltage is typically 3% higher than the nominal output voltage in forced-PWM mode, and the output voltage ripple is 1-2% of the output voltage.For the explanation, please refer to the TPS63020 datasheet, section 7.4.4. The increased output ripple is the price of the power-save mode. Is this critical for your application?

If you want to use this device to drive a TEC, you need to operate it in forced-PWM mode, so that is can source and sink the current.

Best regards,
Milos

0 Minglai Kao over 6 years ago in reply to Milos

Intellectual 635 points

Hi Milos,

Thanks.

Ming

Power management

Power management forum

TPS63020: tps63020