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How to configure Texas Instruments TPS63020EVM-487 for 5 VDC

tony delacruz
Prodigy 80 points
Other Parts Discussed in Thread: TPS63020, TPS63020EVM-487

All,

I purchased the TI TPS63020EVM evaluation module (EVM) which is set to 3.3-V output.  Per the documentation "The TPS63020EVM-487 uses the TPS63020 adjustable version and is set to 3.3-V output."

Also, the documentation states that " Adjustable Output IC U1 Operation: U1 is configured for evaluation of the adjustable output version. This unit is set to 3.3 V. Resistors R1 and R2 are used to set the output voltage between 1.2 V and 5.5 V. See the data sheet for recommended values."

Can the TPS63020EVM evaluation module be configured to provide 5VDC output?

Also, I have one more question.

 want to connect a current scope to the input and output of the TPS63020EVM-487. I have the following current probe available: Tektronic A622

PROBE TYPE
Measurement/Accessory Type: AC/DC Split Core
Signal Type: AC/DC
Required Termination: 1 MegOhm
 
PROBE
Probe Bandwidth: 100 kHz
DC Current: 100 A
Max RMS Current: 71 A
Peak Current: 100 A
Min Current: 10 mA
Probe Cable Length (meter): 2

Will this current probe be sufficient for measuring the current on the TPS63020EVM-487? I'm wondering if the probe bandwidth of 100Khz will be an issue...

Regards

  • 0
    TI__Intellectual 1110 points

    The output voltage of the TPS63020 can be configured by changing the feedback resistors R1 and R2. Care should be taken that the current across R1+R2 is 100 times larger than the leakage current of the Feedback pin (>1uA). As resistors with values higher than 1MOhm are not standard in every lab, I would recommend changing R2 to 113kOhm only, according to chapter 8.2.2.3 in the Datasheet. Here, the current across R1+R2 is 4.4uA, which will reduce the light load efficiency slightly.


    You can use the proposed current probe for in- and output current measurements with a DC load. For measuring the behavior of load transients the bandwidth is not sufficient.
    Regards, Felix

  • 0 in reply to Felix Risch25
    Prodigy 80 points

    Just to be clear on my end. I will leave R1=1.02M, and change R2=113K. Correct?

    Last two questions. This is my first introduction to surface mounted components. How do I specify and find the correct surface mounted resistor (I'm familiar color bands for resistor values)?

    I understand that the resistance for R2 could be letters and digits. I think R2 resistor value should be "1" "1" "3" "3". Is that correct?


    Ordering the correct resistor. I've encountered the following information on the www about surface mounted resistors and since this is new to me it's a bit overwhelming.

    What type of resistor should I order for this experiment which is just a lab prototype being used to learn more about electronics? Not real sure about the wattage, and packaging, but an equivalent resistor as R1 should be fine, if that can be provided.  The crux here is understanding the correct resistor to order. I may just get a bulk set too... Here are my assumptions below and details that I don't understand.

    I understand  the description below: SMD - surface mounted, 10K resistance, 5% tolerance and 1/6 watt

    Description
    RES SMD 10K OHM 5% 1/16W 0402

    I don't understand the packing info below:

    Packaging
    Tape & Reel (TR)
    Cut Tape (CT)
    Digi-Reel

    Types of SMD Resistors / Chip Resistors
    Current Sense Resistors
    Metal Foil Resistors
    Thin Film Resistors
    High Frequency/RF Resistors
    Thick Film Resistors
    Wirewound Resistors
     

    Thanks so much for your help!

    Best Regards

  • 0 in reply to tony delacruz
    TI__Intellectual 1110 points

    Yes, keep R1 and change R2 to 113kOhm. The marking sounds correct, but especially the small sized ones do not have markings at all. For example, you can use this resistor to change the output voltage: www.digikey.com/.../729854


    You’ll need a 0603 sized SMD resistor. The wattage is not critical, since the current through R1 and R2 is minor. The packaging of the resistors is only from interest for automated mounting. It is common to use thick film resistors for this purpose (thin film work as well, but are more expensive). You can find a lot of information on the internet, about the pros and cons of several resistor types and e.g. how to solder them correctly.
    Regards, Felix