ODROID-H2 DC PWM Fan and acceptable frequency

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SciWax
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ODROID-H2 DC PWM Fan and acceptable frequency

Post by SciWax »

Hello dear people on the forum,

I've bought an ODROID PWM Fan. I've bought the fan from the following distributor: https://www.pollin.de/p/odroid-h2-dc-lu ... nal-810958

Image

I've tried to look for a datasheet for this fan, to get an idea about the acceptable frequency range for this fan, but I couldn't find any information on that. At the moment, I just think that 25 kHz for the fan would be okay after some research about other PWM Fans. Can somebody tell me, which frequency range is acceptable for this fan or which frequency I should use?

Kind regards,

SciWax

mad_ady
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Re: ODROID-H2 DC PWM Fan and acceptable frequency

Post by mad_ady »

How/where do you set the frequency?

SciWax
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Re: ODROID-H2 DC PWM Fan and acceptable frequency

Post by SciWax »

mad_ady wrote:
Sun Jun 28, 2020 1:04 am
How/where do you set the frequency?
I'm using a microcontroller (with PWM registers) to control the fan through it's PWM line, which is the blue cable.

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Re: ODROID-H2 DC PWM Fan and acceptable frequency

Post by mad_ady »

So you're not planning on using it with the H2, right? Because H2's bios can set temperatures and (if I remember correctly) fan duty cycle.

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Re: ODROID-H2 DC PWM Fan and acceptable frequency

Post by SciWax »

mad_ady wrote:
Sun Jun 28, 2020 3:33 am
So you're not planning on using it with the H2, right? Because H2's bios can set temperatures and (if I remember correctly) fan duty cycle.
Indeed. I just need more information about that fan and it's target frequency. So far it looks like I can control it with my MCU and it's PWM line, while using a target frequency of 25 kHz. With my chosen duty cycle, I can get the fan power consumption down to 13 mA. The fan runs for 12 hours flawlessly now. I even stopped the fan with my finger a little while ago and after a few seconds it started running again.

But yeah, I would really like to now the official target frequency, but I just couldn't find a datasheet for this fan. It's just guessing at the moment.

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Re: ODROID-H2 DC PWM Fan and acceptable frequency

Post by odroid »

As far as I remember, the recommended PWM frequency was 20~25Khz.
Please try it and let me know the result.
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SciWax (Tue Jun 30, 2020 11:11 pm)

SciWax
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Re: ODROID-H2 DC PWM Fan and acceptable frequency

Post by SciWax »

odroid wrote:
Mon Jun 29, 2020 10:55 am
As far as I remember, the recommended PWM frequency was 20~25Khz.
Please try it and let me know the result.
Thank you for the recommended target frequency. I've used 25000 Hz as a target frequency from the get go and I didn't see any problems with it. The fan is running at least 24 hours now without a problem. So your mentioned 20~25kHz are probably right.

Kind regards
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odroid (Wed Jul 01, 2020 9:44 am)

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