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[PTH08T220W] & [PTN78060WAD] - Slew rate and Ramp On

Gweltaz TYMEN
Prodigy 30 points
Other Parts Discussed in Thread: PTH08T220W, PTN78060W

Hello everyone,

I want to use the PTH08T220W to generate a 3V3/10A and another one for a 2V5/3A. A PTN78060WAD will be also used for a 7V/1.45A. All 3 power supplies from a 12VDC.

I would like to know if someone could provide me with those information:

- What is the Ramp ON module characteristics V/µs ?

- What is the maximum Inrush Current available?

- What is the current slew rate (response to a current step) A/µs ?

- What is the maximum current step amplitude ?

In advance, thanks for your help.

Bests regards,

  • 0
    TI__Mastermind 38230 points

    Gweltaz

    1. What is the Ramp ON module characteristics V/µs ?

    PTN78060W Published data is 0. 5V/msec.5V/msec

    All published data in Product specification

    PTH08T220Wxx published data is 0.5V/msec

    2 What is the maximum Inrush Current available?

    PTN78060W Published Data is 0.5A/msec

    All published data in Product specification

    PTH08T220Wxx published data is 0.5A/msec.

    3.1 What is the current slew rate (response to a current step) A/µs ?

    PTN78060W published data 1-A/us load step from 50% to100% (Iout maximum) recovery time typical =100µs

    All published data in Product specification

    PTH08T220W published data 2.5A-/us load step from 50% to100% (Iout maximum) recovery time typical =70µs

    3.2- What is the maximum current step amplitude ?

    PTN78060W amplitude (Overshoot/undershoot) ± 5% of Output voltage

    All published data in Product specification

    PTH08T220W amplitude (Overshoot/undershoot) ± 6% of Output voltage No Turbo trans ::
    Tom

    ( With turbo trans function selected, (Overshoot/undershoot) ± 1.2% of Output Voltage)

     

  • 0 in reply to Tom Guerin
    Prodigy 30 points
    Hello Tom,
    Thank you very much for those useful information.
    1. Do you think that for my 3V3/10A power supply I would need to dissipate heat of the power module?
    2. Do you think it should be useful to add a filter (self/capacitor) at the power supply module output PIN? if a Ripple and Noise of 100mV is required.
    Thanks.
    Gweltaz
  • 0 in reply to Gweltaz TYMEN
    TI__Mastermind 38230 points

    Gweltaz: Thanks for the questions.

    1. In the product specification under thermal performance, With 3V3 Vout /10Amps with 12Vin, the thermal SOA is 70°C ambient temperature no airflow or natural convection. The better method for dissipating heat is to solder directly to a 100mm x100mm double-sided PCB with n2 oz. copper. If this is SMT, see the mechanical package for vias suggested.

    2. The best method to reduce output ripple and noise is to add large ceramic capacitors, 1-2 47uf to 100uf . Output ripple is <30mV with 12Vin and 3V3 at all output current

    .

    Tom

  • 0 in reply to Tom Guerin
    Prodigy 30 points
    Hello Tom,
    Thank you very much.
    I was wondering if you have some kind of PCB layout guideline for such power modules in addition to the suggestion you listed in your previous message regarding power dissipation ?
    Is it preferable to use SMT or through hole component? I don't really have constraint.
    Thanks again.
  • 0 in reply to Gweltaz TYMEN
    TI__Mastermind 38230 points

    Gweltaz:

    Thanks for the e-mail on PTH08T220WAD(TH) or PTH08T220WA(S or Z) SMT.

    The recommendation as they are complete power modules is to follow the recommended package drawing layouts at the end of the product specification. On the surface-mount (SMD) version , power pin planes host PCB  utilize 2 or more vias  to interior copper planes( 0,63mm)ID.

    Tom