HammerHead Power

[1843]

Hi to all,
I made HH 3month ago, It was working very weak.
Now I tested the current and voltage of it's coil, they are 130mA & 14v only!
where is the problem?:confused:
My HH workes almost 2w!

[Carl-NC]

I don't understand... the coil "on" current is 130mA? The flyback peak is 14V?

[1843]

Hi

I don't understand... the coil "on" current is 130mA? The flyback peak is 14V?

Yes,It is.

[Carl-NC]

Could be several things... have you looked at the gate drive waveform? If it's weak that could cause what you're seeing. Also, try removing R12 to see if there is a load problem. As always, recheck component values and look carefully for solder shorts.

- Carl

[1843]

Waveform

Hi,
This is the TP2-waveform of my HH2:


Where is the problem?

[1843]

New

Hi Carl,
These are waveforms of my HH:



When I put the Freq at max, Q3 gets warm:confused:
Please help me
Thank you

[1843]

TP6?

Tp6:


TP7:

[Carl-NC]

It's hard to tell from this... What kind of scope are you using? Looks low-bandwidth, and may not be getting the transient flyback. In any case, TP2 looks wrong, and the gate drive looks sluggish. Did you double-check all component values? Look for solder shorts?

- Carl

[1843]

Hi

I checked all component values,they are correct & PCB doesn't any solder short.
In my scope the TIME/DIV is 200us & VOLT/DIV is 5V.
Does the TP6-Waveform look correct?
:confused:

[1843]

R15

Hi Carl,

R15 should be omitted or not? (In the HH opt2)
I did not omit it.

[1843]

R15 should be shorted?

[Carl-NC]

R15 should make no difference. No, TP6 does not look right. See the HH article for what you should expect... there are waveform pics at the end.