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Audio Amplifiers Forum
DRV603 Questions (Role of some Capacitors)
Please refer to below schematic... This schematic is from "DRV603EVM - User Guide (Rev. A)"...
Would you please explain in a bit detail the major role of C35 & C27 capacitors in red quadrangle...?
Thanks... C.W. :)
C27 and C23 are needed for the MFB Low Pass Filter configuration. The paragraph after table 3. in the EVM user's guide page 6 describes the function of the C35 which increases the high freq gain to 2.
Dallas TX, USA
I would like to ask you the formula of DRV603 EVM BD circuit and Application circuit of DRV603 Data sheet.
One of my customer is asking Why TI provide different circuits such as EVM BD and Data sheet. Currently The cusomer is using DRV603 for STB and her R/R is 750K/M.
She is planning to adapt the DRV603 for new models after reviewing circuit of DRV603 detaily.
please give me each formula of the circuits and what different things they have between them.
These values were calculated using a simulation tool like FilterPro or TINA (TI's SPICE program). They are pretty standard op amp filter configurations. It is probably easier to simulate the filter than do hand calculations using formulae.
Audio Applications Engineering Manager
Dallas, TX USA
Unfortunately I provided the result of Simulation by using TINA and Filter-PRO. Even provide the simulation program to the customer.
The customer does not want to have simulation result but nee to have the formulas. My customer's end customer is the DirecTV located in US and the Direc TV is asking the
formulas to apply the DRV603 for New STBs.
Please understand my customer and I hop you to give me the formula as soon as possible.
Unfortunately, a few of the guys are out of the office this week. Can you talk to Max about this? He should be able to help you.
Thank you for the recommnedation.
WTK FAE: Lawrence Han
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