Mastero MK-4 ATX PSU with features. - Page 18

Maddog_rvo · 09-01-2004, 04:12 AM

Quote: Originally Posted by Maddog_rvo

Will post em in about 10hours

(and dont look at the junk i made of it

was testing first)

dammit 12V line for mobo crashes to 11.75V (will it be enough??)

Rob Withey · 09-01-2004, 04:19 AM

Quote: Originally Posted by Maddog_rvo

dammit 12V line for mobo crashes to 11.75V (will it be enough??)

Yes, perfectly within spec.

Mastero · 09-01-2004, 04:26 AM

Looks like a bad national chips guys ... I have a MK4 working perfectly fine was testing it last nite with load with deisel start .. worked great .. !

Ok do you guys want me to redesign the PCB for Max chips.. i know some of you have bought it from me so i can give you the ready to go PCB for free (delivered).

Let me know
Mastero

mscar · 09-01-2004, 04:51 AM

I have a MK4 working too. No problem found in National Chips

Maddog_rvo · 09-01-2004, 05:00 AM

Quote: Originally Posted by Mastero

Looks like a bad national chips guys ... I have a MK4 working perfectly fine was testing it last nite with load with deisel start .. worked great .. !

Ok do you guys want me to redesign the PCB for Max chips.. i know some of you have bought it from me so i can give you the ready to go PCB for free (delivered).

Let me know
Mastero

Cant speak for the others but i did the redesign already for myself (5V line) and it works perfect, except for the boostline, if i connect it i get 6V instead of 5V, can u tell me how to build to boost line for the max chip??, i think i need a 2.7K resistor in it.

Another question, the ps works perfect without the boost line, whats it used for??

Mastero · 09-01-2004, 05:49 AM

Quote: Originally Posted by Maddog_rvo

Cant speak for the others but i did the redesign already for myself (5V line) and it works perfect, except for the boostline, if i connect it i get 6V instead of 5V, can u tell me how to build to boost line for the max chip??, i think i need a 2.7K resistor in it.

Another question, the ps works perfect without the boost line, whats it used for??

I dont understand your meaning of boost line ....

There is only one boost line ie for the 12v section it boost the 12 to 24 and then a stable 12..

so it the 5 and the 3.3 section its buck line meaning the voltage is droped..

So please explain your problem

Mastero

Xavyer · 09-01-2004, 06:00 AM

[dont mind me]
Maddog, een boost line is iets anders als de boost pin. Bij de LM2678 is dat pin 3 en bij de max is dat pin 2. De boost line in dit ontwerp is om het voltage geheel omhoog te zetten van 12V (13,8V) naar 24V om een stabiel geheel te krijgen.
Dus in het ontwerp van Mastero zit één boostline, maar drie boost pins.

Little explanation in dutch 4 maddog
[/dont mind me]

Quote: Originally Posted by Mastero

I dont understand your meaning of boost line ....

There is only one boost line ie for the 12v section it boost the 12 to 24 and then a stable 12..

so it the 5 and the 3.3 section its buck line meaning the voltage is droped..

So please explain your problem

Mastero

He means pin 2 of the max chips.

Maddog_rvo · 09-01-2004, 06:19 AM

Quote: Originally Posted by Mastero

I dont understand your meaning of boost line ....

There is only one boost line ie for the 12v section it boost the 12 to 24 and then a stable 12..

so it the 5 and the 3.3 section its buck line meaning the voltage is droped..

So please explain your problem

Mastero

srry i got the explanation from xavyer in dutch

i meant the boost pin on the max787 chips (pin2) it has to be connected with a 10nf capacitor and a resistor to ground, but what does that pin do, i mean it works perfect with that pin disconnected. Thats where i also found the difference with the national chips, one chip had 12.87 on pin3 and the other 12.3 on the same pin

Xavyer · 09-01-2004, 09:05 AM

Redisigning the PCB for the Max chips on the 3,3 and 5V section is a good idea for us. Maybe I can be the distrubuting point for all the guys over here with the same problem..

Is it possible I can recieve an extra of the 3 relays wich are on the MK4, LM1084-5, LM1084-12, LM2578T-ADJ and the 4x MBR745 with the shipment . with payment ofcourse.

Knudde · 09-01-2004, 09:26 AM

Hey Mastero,
Nice job that PSU, I was making also PSU's on my own,also with lm2687's and another one from an old 230VAC ATX PSU rebuilt to a DC-DC converter wich worked juste fine but the input voltage had to remain a constant value of exact 12.6V otherwise the output was variable(difficult to create a fine regulator at a huge power !)
so i've seen you are also using the LM2687's, etc...
But i have a few questions of the MK-4 type

1. you use 2 LM2678 5..to make 5V (2 in parallel = +-10A) but is it really important to put the 2 coils of 10µH there were the 5v comes together?

2. how do you make your negative voltage supply for your 79L12 and 79L05? with what kind of ic? the LM2587? and these types of 79L.. are only 100mA, is that enough?

3. you have made an extra power of 12V for your MOBO.. why is that?
or is this the "power good " signal ?

Knudde

Mastero · 09-01-2004, 09:40 AM

ok i have started to redeisgn with max chips shall have it ready in a couple of days.. !

Knude:

10uh inductors are used do the chips dont close each other....

i fake the negative with 914B diodess

you can use 7905 which is 1amp ..

thats for the Epia boards

Mastero

Mastero · 09-01-2004, 09:41 AM

Quote: Originally Posted by Xavyer

Redisigning the PCB for the Max chips on the 3,3 and 5V section is a good idea for us. Maybe I can be the distrubuting point for all the guys over here with the same problem..

Is it possible I can recieve an extra of the 3 relays wich are on the MK4, LM1084-5, LM1084-12, LM2578T-ADJ and the 4x MBR745 with the shipment . with payment ofcourse.

Sure once i have the PCB ready contact me

MAstero

Mastero · 09-01-2004, 09:50 AM

Quote: Originally Posted by Maddog_rvo

srry i got the explanation from xavyer in dutch

i meant the boost pin on the max787 chips (pin2) it has to be connected with a 10nf capacitor and a resistor to ground, but what does that pin do, i mean it works perfect with that pin disconnected. Thats where i also found the difference with the national chips, one chip had 12.87 on pin3 and the other 12.3 on the same pin

Its a like a turbo for the chips internal mosfet ... it helps to open the mosfet fully ...

Max volt there should be around 8v with 12 v input

MAstero

Knudde · 09-01-2004, 11:02 AM

hey Mastero,

can you give a little schematic or a website of how to make such fake negatieve voltage. I assume it is made with the switchpuls on the coil (from the LM287) and so the capacitor will charge to a negatieve voltage (because off the diodes). wright?

and does an epia mobo need an extra 12V ?

best regards, Knudde

Mastero · 09-01-2004, 11:25 AM

Quote: Originally Posted by Knudde

hey Mastero,

can you give a little schematic or a website of how to make such fake negatieve voltage. I assume it is made with the switchpuls on the coil (from the LM287) and so the capacitor will charge to a negatieve voltage (because off the diodes). wright?

and does an epia mobo need an extra 12V ?

best regards, Knudde

knudde i dont work with schematic .. to lazy

why dont you just steal the -12v section from the MK4 component file on my site ....

Mastero