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Class D Switching Power Amplifiers and Power D/A conversion |
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#761 | |
diyAudio Member
Join Date: Jan 2017
Location: Vienna
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Quote:
Hi doc i use 27k , a zener 4Z7 and 28Vpower for the start...... but its not working. VDD is 2,754Volt. then i checked the 3k3 for the divider....its not 3k3 --> 3562R reset an TPS "ARK" is still 0Volt...ok....i have no 3k3 at home ![]() i try shortly to push 33V into it--> VDD is about 2.945V but the TPS"ARK" is still doing nothing=> Reset is 0V so the pin 18 of the TPA is 0V--> no sound curious is that the MR of the TPS "ARK" is "open" but its about 2,74Volt?? did i miss something??? ![]() thx chris |
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#762 |
diyAudio Member
Join Date: Oct 2007
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The levels are 2.87 2.93 2.99 (min type avg), so maybe yours not hitting 2.93V exactly. So either increase the 3k3 a bit or decrease the 27k. It's all written in the datasheet (TPS..)
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#763 |
diyAudio Member
Join Date: Jan 2017
Location: Vienna
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#764 |
diyAudio Member
Join Date: Jan 2017
Location: Vienna
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...thank you Doc...its working
changed R1 to 22kR 1% and at 29,25V the circuit is working ![]() at the R2(3562) its 2,986V...so its in between the tolerance. the out pop is still audible "loud" compared to the power on plop. in my lab i use a small 4 ohm speaker. will see/hear at my good speakers what happend when the amp is ready... thx chris |
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#765 |
diyAudio Member
Join Date: Oct 2007
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Interesting.. i haven't noticed any problems/plop with my amps. So something must be different for the 12V rails on yours.
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360customs.de - Projects: MAX9709 TPA3132D2 TPA3245/TPA351/TPA3255 - SigmaDSP - CSR8645 - BQ24450 - LTC3784 1200W Multiphase Boost |
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