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TPS40210 boost VIN=5V to Vout=12.6V @ 3A output current application

Jim CHEN
Expert 4795 points
Other Parts Discussed in Thread: TPS40210

does anyone know the TPS40210 can support 5VIN to 12VOUT with 3A output current loading? How much output capacitor enought? How to design compensation value to meet above application if customer want to use 33uF output capacitor? Thanks

  • 0
    TI__Genius 17240 points

    Hi Joseph,

    TPS40210 can be used for the application. You can use SwitchPro to help the compensation design. The concern for the use a 33-uF output capacitor will be its RMS current rating. But, again, SwitchPro can help calculate the RMS current stress on output capacitor.

    Regards,

    Na

  • 0 in reply to Na Kong
    TI__Expert 4795 points

    Hello Na,

    Thanks, customer (IEC) will use SEPIC buck-boost for VIN= 8V~ 19V to VOUT=12V with 2.5A application, now they want to make sure DIS/ # EN pin Hi (turn off ) and Low (turn on) threshold; from datatsheet shown, 0.7V ~ 1.3V for turn on voltage, I have some questions as below;

    1. is it make sure TPS40210 turn on if DIS/ #EN pin below 0.7V, right?

    2. If customer use external divider resistors with logic FET to control enabled & disabled by EC, how to design the divider resistor values? how about DIS/ #EN pin internal resistor impedance?

    Thanks

    Regards,

    Joseph Chen (TWN NB FAE)

  • 0 in reply to Jim CHEN
    TI__Genius 17240 points

    Hi Joseph,

    Please find my comment below

    1. is it make sure TPS40210 turn on if DIS/ #EN pin below 0.7V, right?

    [Na]: Yes, TPS40210 turns on if DIS/EN bar pin is below 0.7 V.

    2. If customer use external divider resistors with logic FET to control enabled & disabled by EC, how to design the divider resistor values? how about DIS/ #EN pin internal resistor impedance?

    [Na]: The DIS pin has a pull down resistance of 1.1 Mohm. Please consider this impedance when designing the divider resistor on this pin.

    Regards,

    Na

  • 0 in reply to Na Kong
    TI__Expert 4795 points

    Hi, Na,

     

    I have one question on TPS40210 used as SEPIC loop gain measurment: how to measure the loop gain for SEPIC? the result seems loke very strange.

    we used AP200 instrument, can you teach me or input your valuable comment? Thanks

     

    Regards,

    Joseph Chen

  • 0 in reply to Jim CHEN
    TI__Genius 17240 points

    Hi Joseph,

    There are some reference designs using TPS40210 in a SEPIC converter. You may find them on the TPS40210's webpage. The following is one of the examples.

    http://www.ti.com/tool/pmp5910

    There should be no difference with other topologies for loop measurement. In the above example, R10 in the feedback loop is inserted for loop response measurement.

    • Connect isolation transformer to test points maked TP7 and TP4.
    • Connect input signal amplitude measurement probe (Channel A) to TP7.
    • Connect output signal amplitude measurement probe (Channel B) to TP4.
    • Connect ground lead of Channel A and Channel B to TP8.
    • Inject around 10 mV or less signal through the isolation transformer.
    • Sweep the frequency from 100 Hz to half of the switching frequency with 10 Hz or lower post filter.

    The loop gain and phase can be measured.

    Regards,

    Na