PTH08T240F

Xavier Tisaire

Other Parts Discussed in Thread: PTH08T240W, PTH08T240F

Hi all,

Sorry for making this dumb question, but I'm not quite sure of the implications:

I'm having serious problems on finding the PTH08T240F, so I was wondering if I could just switch it by the PTH08T240W and increase the capacitance output, or even add a second order filter.

If so, how many capacitance should I add?

Regards,

Xavi

over 13 years ago

0 Tom Guerin over 13 years ago

TI__Mastermind 38230 points

Hi Xavi:

The PTH08T240W with 720uF low ESR capacitors , 6-10mΩ each or total and 20kΩRtt resistor.Do not add any external filters to the output bus as this degrades the limits.

Thanks

Tom

0 Xavier Tisaire over 13 years ago in reply to Tom Guerin

Intellectual 310 points

Hi Tom,

Thanks a lot for your answer. Just to understand how did you get this values, how did you do the math?

Regards,

Xavi

0 Tom Guerin over 13 years ago in reply to Xavier Tisaire

TI__Mastermind 38230 points

The data below if from the Turbo trans data calculator or the link below.

http://focus.ti.com/analog/docs/turbotranssearch.tsp?familyId=561

Discover How T2 Modules Can Reduce Your Output Capacitance

* Required

Enter your system information:

the data from the

*Vin (min) (V)

*Vin (max) (V)

* Preferred Bulk Capacitor Type

Type A (e.g. ceramic)

Type B (e.g. polymer tantalum)

Type C (e.g. OS-CON)

Known Bulk Capacitor Values:

* ESR (mΩ)
* Cout (uF)

*Vout (V)

*Iout (max) (A)

*Max Current Load Step (A)

*Max Voltage Deviation (mV)

*Ta (ambient temp) (ºC)

*Airflow

Natural Convection (0 lfm)
100 lfm (0.5 m/s)
200 lfm (1.0 m/s)
400 lfm (2.0 m/s)

Pages from PTH08T240W POLA spec. turbo trans.pdf

Power management

Power management forum

PTH08T240F

The data below if from the Turbo trans data calculator or the link below.

Discover How T2 Modules Can Reduce Your Output Capacitance