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TPL0102-EP: Designing with TPL0102-EP

Sv
Intellectual 555 points
Part Number: TPL0102-EP

Tool/software:

Hello team,
We are planning to use the digital potentiometer TPL0102-EP in one of our products.

The same will be used in the feedback network of a DC DC Converter to adjust the voltage.

RPMA-4.5/OF is the DC DC Converter we are planning to use.

We need an output voltage of +5V to +18V. (1V step)
So the value of the Trim resistor will be 8.57K to 0.91K.

Can you please clarify the following doubts we are having?.

1). Can I use the digipot TPL0102-EP for our application?.

2). What is the maximum allowable current through this digipot?.

3). The tolerance of the digipot is 20%, is there any other device available will low tolerance?.

4). In our case we will be using only HA and WA. HA will be connected to TRIM and WA will be connected to the +VOUT of the DC DC Converter. LA, HB, WB and LB will be left floating

5). Is there any problem if we connect the 2 channels of TPL0102-EP in series.

6). Is it possible to get 0E resistance from the digipot (considering wiper resistance).

7).

  • 0
    TI__Mastermind 42013 points

    Hello, 

    1) Is -VOUT connected to ground? The TPL has a max voltage rating, but if the terminals will be connected between the 0.6V reference voltage and ground then this should be fine. 

    2) 20mA pulse, 2mA continuous 

    3) All of our digipots have 20% end to end tolerance. Typically, we can use a DAC in place of a digipot for higher accuracy, but it is not clear to me from the RPMA datasheet if this is possible. They don't share how the voltage setting works. Here is an article about how to use a DAC: Voltage Margining and Scaling Circuit with a Voltage Output Smart DAC (Rev. A)

    4) This is fine. You'll be operating in this mode: 

    5) No problem. Connect HA to TRIM, WA to HB, and WB to -VOUT. 

    6) Considering wiper resistance, no. There will always be a series resistance on each pin. 

    Best,

    Katlynne Jones