PTH04T241W with Filter

Jake Simon52

Other Parts Discussed in Thread: PTH04T241W

I'm looking to use the PTH04T241W module to power a 3.3 V bus from a 5 V input and I need the bus to have other filters connected to it. The filter I'm looking at is shown below.

Will this filter network work with TurboTrans (mostly I'm worried about the inductors)?

If so, where should I place the sense wire to obtain the best results (I was going to place it at the input to the filter, the 3.3 V in the picture)?

over 8 years ago

0 Tom Guerin over 8 years ago

TI__Mastermind 38230 points

Jake:

PTH04T241 an all other PTH08T2 modules with turbo trans function must have the remote sense directly connected to Vout pins, prior to any filter /inductance . The output capacitors must not be separated by an filter /inductor when using turbo trans or normal function.

PTH04T241 requires a minimum 300µF ceramic capacitance before any PI filter.

A recommended Filter file is attached.

TomPTH04T241W Filter Vout .pdf

If tehre are any questions, my e-mail address is:

tguerin@ti.com

0 Jake Simon52 over 8 years ago in reply to Tom Guerin

Prodigy 30 points

Tom:

Thank you for the reply! That was exactly what I was looking for.

0 Jake Simon52 over 8 years ago in reply to Tom Guerin

Prodigy 30 points

Tom:
Looking at the supplied pdf, the T/T pin isn't connected. Can I just connect that pin (through Rtt) to +Vsense?

I would like to use the TurboTrans function if at all possible.

0 Tom Guerin over 8 years ago in reply to Jake Simon52

TI__Mastermind 38230 points

Jake:

The 3.3V bus and open turbo-trans function/ resistor with 300uf ceramic on Vout and 2.5Amp load step transient ± deviation is 60mV minimum 3.24V and 3.36 maximum . This is with no turbo-trans(TT) function or open TT.

If the ± transient requirement on 3.3V is 20mV , or 3.28V minimum,3.32V maximum then the required total output ceramic capacitance is additional 1160µF with the turbo- trans resistor 274Ω.

Regards

Tom

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PTH04T241W with Filter