MTN-17DDM squeals like a pig when amp juice is flowing

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trailhunter
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MTN-17DDM squeals like a pig when amp juice is flowing

When hitting 10+ amps, the driver starts screaming with a high pitched squeal. Is this driver inductor whine and is it of concern? I’m hitting 19A on my setup.

KnHawke
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I wonder if it is a bad FET, since there is no inductor on these drivers.
Just put together a set of the 20mm version of this exact same thing and so far, no problems with these little mini-monsters (XPL2-HD and XHP50.2-3V)

What host and LED you using BTW?

moderator007
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KnHawke wrote:
I wonder if it is a bad FET, since there is no inductor on these drivers.
Just put together a set of the 20mm version of this exact same thing and so far, no problems with these little mini-monsters (XPL2-HD and XHP50.2-3V)

What host and LED you using BTW?


It would about have to be the PWM in the fet. Possible the PWM frequency isn’t low enough or bad fet like KnHawke said.
Which firmware did you choose?
trailhunter
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KnHawke wrote:
I wonder if it is a bad FET, since there is no inductor on these drivers.
Just put together a set of the 20mm version of this exact same thing and so far, no problems with these little mini-monsters (XPL2-HD and XHP50.2-3V)

Thanks, it’s in a s2+ and it’s an xhp50.2

What host and LED you using BTW?

trailhunter
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moderator007 wrote:
KnHawke wrote:
I wonder if it is a bad FET, since there is no inductor on these drivers.
Just put together a set of the 20mm version of this exact same thing and so far, no problems with these little mini-monsters (XPL2-HD and XHP50.2-3V)

What host and LED you using BTW?


It would about have to be the PWM in the fet. Possible the PWM frequency isn’t high enough or bad fet like KnHawke said.
Which firmware did you choose?

I’m using bistro.

moderator007
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I’m no expert here but it might be worth a try. Changing between fast and phase correct pwm might solve the problem. I don’t know which one you have now.
//#define FAST 0×23 // fast PWM channel 1 only
//#define PHASE 0×21 // phase-correct PWM channel 1 only
#define FAST 0xA3 // fast PWM both channels
#define PHASE 0xA1 // phase-correct PWM both channels
Toykeeper would be the expert with this. Richard at Mtn might know how to solve the problem.
.
You might find a solution here. https://forum.allaboutcircuits.com/threads/mosfet-gate-ringing.151840/
Adding a resistor in series to the gate or lowering the frequency may help. But I have used this type fet+1 driver (blf x6) with a triple pulling similar currents without whine or ringing as they call it. I used NarsilM made for e-switch.

CRX
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trailhunter
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CRX wrote:
Silicone cubes.

Cute cubes, what do I do with em? Smile

trailhunter
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moderator007 wrote:
I’m no expert here but it might be worth a try. Changing between fast and phase correct pwm might solve the problem. I don’t know which one you have now. //#define FAST 0×23 // fast PWM channel 1 only //#define PHASE 0×21 // phase-correct PWM channel 1 only #define FAST 0xA3 // fast PWM both channels #define PHASE 0xA1 // phase-correct PWM both channels Toykeeper would be the expert with this. Richard at Mtn might know how to solve the problem. . You might find a solution here. https://forum.allaboutcircuits.com/threads/mosfet-gate-ringing.151840/ Adding a resistor in series to the gate or lowering the frequency may help. But I have used this type fet+1 driver (blf x6) with a triple pulling similar currents without whine or ringing as they call it. I used NarsilM made for e-switch.

Thanks for this, I’ll try it out.

Lexel
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Usually mechanical move able parts make the buzz like cables or springs, it’s hard to eliminate if you can’t pot the whole light

Even inside a battery such sounds can be created

CRX
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trailhunter wrote:
CRX wrote:
Silicone cubes.

Cute cubes, what do I do with em? Smile


Squish them into driver spaces.
Flying Luminosity
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CRX wrote:
Silicone cubes.

Not sure if I’d trust an object that’s advertised as a ‘cube’ if it’s only 1cm x 1cm x 0.5cm. That’s either half a cube, or four conjoined cubes.

CRX
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True, don’t use these, they are not labeled absolutely correctly.
Some of the edges are not laser line straight either. False advertising!! Silly

I wish I had realized before using these for years Big Smile

Flying Luminosity
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CRX wrote:
True, don’t use these, they are not labeled absolutely correctly.
Some of the edges are not laser line straight either. False advertising!! Silly

I wish I had realized before using these for years Big Smile

Well to be fair, the term is nowadays used pretty freely! Big Smile

CRX
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Smile
snakebite
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could be piezoelectric noise from an mlcc.

trailhunter
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Do the mtn-17ddm and 20ddm drivers support high current (10-20 amps)?

KnHawke
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I want to say Yes to that, since looking at how the parts are laid out by the direct bypass of the positive line and the very short negative traces near the edge of the board, but I have no equipment to measure the XHP50.2 I have here and going by Vesture’s readings of the same LED, I could be pulling 13 amps.

KawiBoy1428
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trailhunter wrote:
Do the mtn-17ddm and 20ddm drivers support high current (10-20 amps)?

These (2) 50.2 3v builds draw over 20 amps some builds 30+ amps…on a 30T using Mtn Drv’s…4800-9000lm

KB1428 “Live Life WOT

trailhunter
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KawiBoy1428 wrote:
trailhunter wrote:
Do the mtn-17ddm and 20ddm drivers support high current (10-20 amps)?

These (2) 50.2 3v builds draw over 20 amps some builds 30+ amps…on a 30T using Mtn Drv’s…4800-9000lm

!{width:100%}https://i.postimg.cc/ZY74GB35/IMG-0255.jpg!

29A is incredible, what battery do you use to get that?

KawiBoy1428
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trailhunter wrote:
KawiBoy1428 wrote:
trailhunter wrote:
Do the mtn-17ddm and 20ddm drivers support high current (10-20 amps)?

These (2) 50.2 3v builds draw over 20 amps some builds 30+ amps…on a 30T using Mtn Drv’s…4800-9000lm

!{width:100%}https://i.postimg.cc/ZY74GB35/IMG-0255.jpg!

29A is incredible, what battery do you use to get that?


21700 Ohm Run or a 30T….

KB1428 “Live Life WOT