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.
In reply to Allan Herriman:
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.
In reply to Tom Guerin:
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.