Other Parts Discussed in Thread: PTH05050W
Hello,
The PTH05010 emits a high whistle tone. It is the coil on the module. (Vin 5 V, Vout 0.85V, Iout 8 Amps. What can we do about it?
Best regards
Norbert
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi Norbert:
Any noise from the PTH05010W is likely the resultant low frequency transient on the VOLT power bus or insufficient input polarized capacitance .
Input capacitance must be at least 470UF polarized capacitor see attached.
Suggest adding a polarized capacitor of at least 330uF on the output bus will minimize with aid in output low audible transient.
Tom .
.
Hello Tom,
I put one 470 uF Elco to the input and one 470 uF Elco to the output. They are soldered directly on top of the PTH module. The whistle tone didn't vanish.
Only the powerful touch of the coil on the module affects the whistling sound.
Best regards
Norbert
Norbert:
Please contact me directly off line at tguerin@ti.com. on this apparent transient issue. What is the complete PTH05050W part number
Include in your e-mail,
1 picture of the top side and bottom side components, and how the input and output capacitors are connected .Include the module part number in the pictures.. How are you connecting Vout and Vin along with the ground
2. What is the input and output capacitor part number, vendor and ESR of these capacitors.
3. What is the Vout and output current load.?
4. What is the Vin voltage and source? Is this a DC input?
5. Include Wave form pictures of Vin B+ and Vout B+
Tom
5.