bendeg
Member
Last Activity: 05-15-2024, 06:36 AM
Joined: 04-03-2023
Location: Mons
-
Thanks !... -
Re: AeroCool VP-550 : IC identification issue
Final test to be certain :
A PC powered with ATX and CPU connectors only (I didn't remove the PC power supply to put the repaired one) => ok, no magic smoke or magic smell, fan is spinning gently.
It is working fine under normal load (CPU, system fan, graphic card and its fan, etc...)Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
2nd test, fan connected, with light bulb + power supply tester :
power on (all voltages seemed to be good on power supply tester), fan on, then all went off...
3rd test, no light bulb, power supply tester : all voltages ok (see attachment)
4th test , no light bulb, with 1 HDD : ok, all seems working so far !
As this is my very first "serious" electronic repair, I'm very happy !
Thanks so much guys for all your help !...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
So far, so good :
New components soldered : [LIST][*]fuse (6.3A)[*]thermistor (SCK-2R56, 2.5 ohms, 6A)[*]bridge rectifier (GBU810 instead of GBU606)[*]mosfet (MDP13N50)[*]diode (original DP8S60P was ok but replaced with a MUR1560)[*]capacitor (180uF, 450V, Nichicon). No additionary capacitor as advised by momaka...[*]PWM STR6069H[/LIST]
1st test with 80W light bulb in series looks ok, fuse doesn't blow ! (fan not connected yet)[LIST][*]Small flash then off[*]Stand by voltage (purple wire) : 5.22V[*]Green...Last edited by bendeg; 05-21-2023, 02:25 AM.Leave a comment:
-
Re: Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc
Little update for those who might be interested.
Different tests :
1) Same config as original but n-mosfet changed : IRF520 (2V < Vgs < 4V), instead of a MDP13N50 (3V < Vgs < 5V)
=> works better.
2) Without second 555 and Ra = 10k-pot instead of 1k-fixed to modulate duty cycle) : output of 555 direct to base of IRF520.
Working.
3) Same config as point 2) but replacing n-mosfet IRF520 with 3 npn BC547 in parallel...Leave a comment:
-
Re: Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc
@momaka,
Indeed, it's possible to modulate duty cycle with only one 555. I'll try that.
I'll try with BJTs once I've got a bigger transistor than a tiny BC547, max 100mA for collector current if I'm not mistaken (fan demands twice as much). Or use 2 of them in parallel, is that possible to do ?
But, as I can see on the net, those 3 pins fans aren't very well suited for PWM driving, better use 4 pins fans which are designed to be controlled with PWM......Leave a comment:
-
Re: Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc
I tried your "easy solution and, indeed, it works.
GNDs of PS1 and PS2 are connected (I tried that as well before posting, without success...).
But now I can hear what I think is most probably the frequency of the PWM : the sound, which is not loud, definitely comes from the fan circuit.
The tone gets higher if I make it faster (10k-pot of 1st timer AND 10k-pot to modulate second timer).
Funny but a bit scary though, I don't like that much, looks like it...Leave a comment:
-
Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc fan
Hi reader,
I'm trying to control a pc fan speed by giving PWM to the gate of a n-mosfet.
1) generation of a clock with a 555 timer (~ 1,5 kHz, as seen in the datasheet, fig.12) (Vcc = 6V).
Output to TRIG of second timer (pin 2) + red led
2) generation of a PWM with a second 555 timer (as seen in the datasheet, fig.18), CONT (pin 5) modulated by a variable 10k resistor (Vcc)
3) Using output of second timer to "pulse" n-mosfet gate (MDP13N50) + yellow led
4) pc fan (12V, 0.18A) in series in drain-source of... -
Re: AeroCool VP-550 : IC identification issue
Ok, you confirm, thanks !
Thank you for that information !
I've sent a message to the guy who created the "The Resistor FAQ" thread. I can't do better....Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
I think I finally found a good info here, at the end of the page, it tells about some exceptions to the rule :
[URL="https://eepower.com/resistor-guide/resistor-standards-and-codes/resistor-color-code/"]https://eepower.com/resistor-guide/resistor-standards-and-codes/resistor-color-code/[/URL]
So, in my case :
Bands 1 and 2 : BROWN - BLACK => 10
Band 3 : SILVER (multiplication factor) => 10 * 0.01 = 0.1 Ohms
Band 4 : GOLD (tolerance) => 5%
Band...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
What is the power rate of that 5 bands resistor (1 stage, near the big capacitor) ?
I couldn't find a color code calculator that found the answer using 5 bands.
Looks like it's a 4 bands resistor with a fifth one...
According to its color, BROWN - BLACK - SILVER - GOLD - GREEN...
(correct me if I'm wrong, I'm color blind, I've got problems especially with the greens, I'm a "deuteranope" guy)
...it's a 4 bands resistor, and it should be a 0.1 Ohm 5% resistor, right ? (and indeed,...Last edited by bendeg; 04-26-2023, 02:13 AM.Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
Oh, that's a lot of information.
There's more to do now...I'll update this thread when I've got all the components.
Thank you very much !!!...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
1)
Fortunately, STR-6069H hasn't been delivered yet. Thank you for the advice !
And indeed, as I can read in the datasheet, page 23, for pin 7 (I believe this is what you want to tell me...) :
"
(7) Thermal Considerations
Because the power MOSFET has a positive thermal
coefficient of R DS(ON) , consider it in thermal design.
Since the copper area under the IC and the D/ST [B]pin
trace act as a heatsink[/B], its traces should be as wide as
possible....Last edited by bendeg; 04-12-2023, 08:23 AM.Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
Indeed, I only tried google search...
Oh, ok, it'll be the A6069H or any A606x then (700V max), not the A6059H (650V max).
Thank you very much for that info !...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
It's a slightly different configuration (there's a second capacitor near the heatsink and there's no what looks like a yellow capacitor close to pin 3 and 4)
But anyway, thank you so much !!!
I also plan to install a 8 pins socket so IC can be replaced easily if needed.
Keep you all updated once I've got all parts soldered.
Fingers crossed......Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
As I see in the datasheet A6059H has the same specs (it would probably be a good replacement IC)
But how the hell did you find that !?!?
Thank you so much !!!...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
I've received the STR-A6059H (working at 100kHz), and ready to be soldered, but I think it may not be a good idea (I've ordered 6 others of the series, mainly those that works at 67kHz, but 2 others that works at 100kHz as well, a bit crazy but I must try...) :
Let's suppose the proper IC should work at 67kHz, it such a case it means it also expects modulation feedback that would not match if I put one that works at 100kHz, right ?
In a nutshell, in such a case, the "modulation...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
Ok, thanks for the advice !...Leave a comment:
-
Re: AeroCool VP-550 : IC identification issue
What do you think of such fuse holder in a PC power supply ?
[LIST=1][*]Ok, no problem[*]No way ![*]At your own risks ![/LIST]
In fact, I don't really trust that kind of holder : inner springs might be loose over time...
- Re: AeroCool VP-550 : IC identification issue
What do you think of such fuse holder in a PC power supply ?
[LIST=1] - Ok, no problem
- No way !
- At your own risks ![/LIST]
In fact, I don't really trust that kind of holder : inner springs might be loose
Leave a comment:
- Re: AeroCool VP-550 : IC identification issue
-
Re: AeroCool VP-550 : IC identification issue
Oh ok, I thouht these 2 ICs were related. I know now they aren't.
So, if the STR-A6059H I ordered fits well (fingers crossed...) and replacing the thermistor, the bridge rectifier, the MOSFET and the unique filter capacitor (180uF, 400V, reads only 5.5uF with the multimeter), I should see +5V on PS-ON and +5V on STAND BY, right ?
(I should probably better try with a bulb in series first...)
There's indeed another IC on the other side of the PCB which controls PFC : CM6805BG (10 pins,...Last edited by bendeg; 04-04-2023, 08:26 AM.Leave a comment:
No activity results to display
Leave a comment: