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Auto-track max slew rate on PTH08txxx family
I'm using the auto-track inputs on PTH08T220W and PTH08T210W in a design for a client.
The datasheets for those parts specify a maximum slew rate "capability" on the auto-track inputs of 1V/ms.
My design has a small fet that can pull down the auto-track voltage
rather quickly and I have a large (4mF) capacitance on the output of the
PTH08T210W. Will this cause any damage? How can I predict the output
voltage waveform under these conditions?
Perhaps I should ask a different question since that one didn't get any response...
The Auto-Track app note slyt095.pdf says "each Track pin is also provided with its own RC charge circuit that can produce a suitable rising voltage from the input source voltage."
Could someone please post details of this circuit? I know from reading the datasheet that the Thevenin equivalent of the track input is something like a 60-70kohm resistance pulling up to 8V or so, but I can't tell how the capacitor is connected.
The auto track function dv/dt for PTH08T2 is different of each group of PTH08T2 modules.
The PTH08T210 is pulled up to 5V with a 43.2k resistor The circuit has a 1uf capacitor and a 43.2K resistor. The RC is 43 ms to maximum 5V.
The PTH08T220 through PTH08T260 is pilled up to 6.2V maximim with a 56k resistor. The circuit has a 1uf capacitor and a 56K resistor. The RC is 56ms to maximum 6.2V.
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