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PTH08080W to Power Iridium 9602 Unit

ler
Expert 1070 points
Other Parts Discussed in Thread: PTH08080W, PTN78020W, PTH08T231W

Hello,

We are considering using your PTH08080W module to power the Iridium 9602 satellite transciever.  The power supply requirements for the Iridiums are:

(11 to 15 VDC Input, 5VDC 2A output)

1) Droop for 8.3ms burst of 1.5A current should not be more than 0.2Volts.

2) In-rush current to Iridium limited to 4A maximum.

Will this module do the job?  Can you recommend this part or is there another that might be better?  This is a battery operated system so efficiency is important.

Thanks.

Loren

  • 0
    TI__Mastermind 38230 points

    The PTH08080  current limit is 2.25A . The application is 5V at 2Amp continuous with current  bursts of 8.3ms 1.5Amp will exceed its current limits. The PTH08080W will not meet your requirements.

    The ambient temperature is unknown ? Is it greater than 85°C? All of the modules are rated to a maximum ambient temperature of 85°C>

    There is  no smaller version of this module for 4Amp rating. 

     The PTN78020W  ( larger  module) would  be the higher current  module with this input voltage range of 11V to 15V.

    http://focus.ti.com/docs/prod/folders/print/ptn78020w.html

    If you can limit the absolute  input voltage to 14V, The PTH08T231W (rated to 6 Amps) requires only all ceramic capacitors.  

    http://focus.ti.com/docs/prod/folders/print/pth08t231w.html

    Tom

  • 0 in reply to Tom Guerin
    Expert 1070 points

    Tom,

    As I look at the actual current profile for the 9602, the typical current draw is only 40 mA with a transmit surge of 1.5A for 10ms and a typical receive surge of 195mA

    for 10ms.  I'm thinking with this more precise spec, the PTH08080 will work.  What do you think?  Sorry for my poor initial specification.  I have attached the current

    profile in a word document.

    Thanks.

    6813.profile.docx

     

    Loren

  • 0 in reply to ler
    TI__Mastermind 38230 points

    The PTH08080W will work in this  application with a  polarized output capacitor of 220UF ESR  must be at 15mΩ or greater . The total combined capacitance on the output is :

    1. Output capacitance=

    A. 330uF total capacitance with no more than 220uF ceramic capacitance.

    B. The input bus must have the  polarized 100uF capacitor.

    Regards

    Tom

  • 0 in reply to Tom Guerin
    Expert 1070 points

    Thanks Tom.  I will drive it in there and let you know how it performs.

     

    Loren