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200W ATX PC Power Supply
Thanks to Pavel Ruzicka for his permission to publish this article on this site. Author: Pavel Ruzicka
Email: [email protected]
Web: http://pavouk.comp.cz
Here I bring you wiring diagram of PCs power supply of DTK company. This power
supply has ATX design and 200W performance. I was drawed diagram, when I
repaired this power supply.
This power supply circuit uses chip TL494. Similar circuit is used in the most power
supplies with output power about 200W.Device use push-pull transistor circuit with
regulation of output voltage.
Line
vol
tage
goe
s th
roug
h in
put f
ilter
circ
uit (
C1,
R1,
T1,
C4,
T5)
to th
e br
idge
rect
ifier
. Whe
n vo
ltage
is s
witc
hed
from
230V
to 1
15V,
then
rect
ifier
wor
ks li
ke a
dou
bler
. Var
isto
rs Z
1 an
d Z2
hav
e ov
ervo
ltage
pro
tect
func
tion
on th
e lin
e in
put.
Ther
mis
tor N
TCR
1 lim
its in
put c
urre
nt u
ntil
capa
cito
rs C
5 an
d C
6 ar
e ch
arge
d. R
2 an
d R
3 ar
e on
ly fo
r dis
char
ge
capa
cito
rs a
fter d
isco
nnec
ting
pow
er s
uppl
y. W
hen
pow
er s
uppl
y is
con
nect
ed to
the
line
volta
ge, t
hen
at fi
rst a
re c
harg
ed
capa
cito
rs C
5 an
d C
6 to
geth
er fo
r abo
ut 3
00V.
Then
take
a ru
n se
cond
ary
pow
er s
uppl
y co
ntro
lled
by tr
ansi
stor
Q12
and
on
his
outp
ut w
ill be
vol
tage
. Beh
ind
the
volta
ge
regu
lato
r IC
3 w
ill be
vol
tage
5V,
whi
ch g
oes
in to
the
mot
herb
oard
and
it is
nec
essa
ry fo
r tur
n-on
logi
c an
d fo
r "W
ake
on
som
ethi
ng" f
unct
ions
.
Nex
t uns
tabi
lized
vol
tage
goe
s th
roug
h di
ode
D30
to th
e m
ain
cont
rol c
hip
IC1
and
cont
rol t
rans
isto
rs Q
3 an
d Q
4. W
hen
mai
n po
wer
sup
ply
is ru
nnin
g, th
en th
is v
olta
ge g
oes
from
+12
V ou
tput
thro
ugh
diod
e D
.
Stan
d-B
y m
ode
In s
tand
-by
mod
e is
mai
n po
wer
sup
ply
bloc
ked
by p
ositi
ve v
olta
ge o
n th
e PS
-ON
pin
thro
ugh
resi
stor
R23
from
seco
ndar
y po
wer
sup
ply.
Bec
ause
of t
his
volta
ge is
ope
ned
trans
isto
r Q10
, whi
ch o
pens
Q1,
whi
ch a
pplie
s re
fere
nce
volta
ge +
5V fr
om p
in 1
4 IO
1 to
pin
4 IO
1. S
witc
hed
circ
uit i
s to
tally
blo
cked
. Tra
nzis
tors
Q3
and
Q4
are
both
ope
ned
and
shor
t-circ
uit w
indi
ng o
f aux
iliary
tran
sfor
mer
T2.
Due
to s
hort-
circ
uit i
s no
vol
tage
on
the
pow
er c
ircui
t. By
vol
tage
on
pin
4
we
can
driv
e m
axim
um p
ulse
-wid
th o
n th
e IO
1 ou
tput
. Zer
o vo
ltage
mea
ns th
e hi
ghes
t pul
se-w
idth
. +5V
mea
ns th
at p
ulse
disa
ppea
r.
Now
we
can
expl
ain
func
tion
of ru
nnin
g po
wer
sup
ply.
Som
ebod
y pu
shes
the
pow
er b
utto
n on
com
pute
r. M
othe
boar
d lo
gic
put t
o gr
ound
inpu
t pin
PS-
ON
. Tra
nsis
tor Q
10 c
lose
s
and
next
Q1
clos
es. C
apac
itor C
15 b
egin
s hi
s ch
argi
ng th
roug
h R
15 a
nd o
n th
e pi
n 4
IC1
begi
ns d
ecre
ase
volta
ge to
zer
o
than
ks to
R17
. Due
to th
is v
olta
ge is
max
imum
pul
se-w
idth
con
tinuo
sly
incr
ease
d an
d m
ain
pow
er s
uppl
y sm
ooth
ly g
oes
run.
In a
nor
mal
ope
ratio
n is
pow
er s
uppl
y co
ntro
lled
by IC
1. W
hen
trans
isto
rs Q
1 an
d Q
2 ar
e cl
osed
, the
n Q
3 an
d Q
4 ar
e
open
ed. W
hen
we
wan
t to
open
one
from
pow
er tr
ansi
stor
s (Q
1, Q
2), t
hen
we
have
to c
lose
his
exc
iting
tran
sist
or (Q
3,
Q4)
. Cur
rent
goe
s vi
a R
46 a
nd D
14 a
nd o
ne w
indi
ng T
2. T
his
curre
nt e
xcite
vol
tage
on
base
of p
ower
tran
sist
or a
nd d
ue
to p
ositi
ve fe
edba
ck tr
ansi
stor
goe
s qu
ickl
y to
sat
urat
ion.
Whe
n th
e im
puls
e is
fini
shed
, the
n bo
th e
xciti
ng tr
ansi
stor
s go
es
to o
pen.
Pos
itive
feed
back
dis
sape
ars
and
over
shoo
t on
the
exci
ting
win
ding
qui
ckly
clo
ses
pow
er tr
ansi
stor
. Afte
r it i
s
proc
ess
repe
tead
with
sec
ond
trans
isto
r. Tr
ansi
stor
s Q
1 an
d Q
2 al
tern
atel
y co
nnec
ts o
ne e
nd o
f prim
ary
win
ding
to
posi
tive
or n
egat
ive
volta
ge. P
ower
bra
nch
goes
from
em
itor o
f Q1
(col
lect
or Q
2) th
roug
h th
e th
ird w
indi
ng o
f exc
iting
trans
form
er T
2. N
ext t
hrou
g pr
imar
y w
indi
ng o
f mai
n tra
nsfo
rmer
T3
and
capa
cito
r C7
to th
e vi
rtual
cen
ter o
f sup
ply
volta
ge.
Out
put v
olta
ge s
tabi
lisat
ion
Out
put v
olta
ges
+5V
and
+12V
are
mea
sure
d by
R25
and
R26
and
thei
r out
put g
oes
to th
e IC
1. O
ther
vol
tage
s ar
e no
t
stab
ilised
and
they
are
just
ified
by
win
ding
num
ber a
nd d
iode
pol
arity
. On
the
outp
ut is
nec
essa
ry re
acta
nce
coil
due
to
high
freq
uenc
y in
terfe
renc
e.
This
vol
tage
is ra
ted
from
vol
tage
bef
ore
coil,
pul
se-w
idth
and
dur
atio
n cy
cle.
On
the
outp
ut b
ehin
d th
e re
ctifi
er d
iode
s is
a
com
mon
coi
l for
all
volta
ges.
Whe
n w
e ke
ep d
irect
ion
of w
indi
ngs
and
win
ding
num
ber c
orre
spon
ding
to o
utpu
t vol
tage
s,
then
coi
l wor
ks li
ke a
tran
sfor
mer
and
we
have
com
pens
atio
n fo
r irre
gula
r loa
d of
indi
vidu
al v
olta
ges.
In a
com
mon
pra
ctis
e ar
e vo
ltage
dev
iatio
ns to
10%
from
rate
d va
lue.
Fro
m th
e in
tern
al 5
-V re
fere
nce
regu
lato
r (pi
n 14
IC1)
goe
s re
fere
nce
volta
ge th
roug
h th
e vo
ltage
div
ider
R24
/R19
to in
verti
ng in
put(p
in 2
) of e
rror a
mpl
ifier
. Fro
m th
e
outp
ut o
f pow
er s
uppl
y co
mes
vol
tage
thro
ugh
divi
der R
25,R
26/R
20,R
21 to
the
non
inve
rting
inpu
t (pi
n 1)
. Fee
dbac
k C
1,
R18
pro
vide
s st
abilit
y of
regu
lato
r. Vo
ltage
from
erro
r am
plifi
er is
com
pare
d to
the
ram
p vo
ltage
acr
oss
capa
cito
r C11
.
Whe
n th
e ou
tput
vol
tage
is d
ecre
ased
, the
n vo
ltage
on
the
erro
r am
plifi
er is
tood
ecre
ased
. Exc
iting
pul
se is
long
er, p
ower
trans
isto
rs Q
1 an
d Q
2 ar
e lo
nger
ope
ned,
wid
th o
f pul
se b
efor
e ou
tput
coi
l is
grat
er a
nd o
utpu
t pow
er is
incr
ease
d. T
he
seco
nd e
rror a
mpl
ifier
is b
lock
ed b
y vo
ltage
on
the
pin
15 IC
1.
Pow
erG
ood
Mai
nboa
rd n
eeds
"Pow
erG
ood"
sig
nal.
Whe
n al
l out
put v
olta
ges
goes
to s
tabl
e, th
en P
ower
Goo
d si
gnal
goe
s to
+5V
(logi
cal o
ne).
Pow
erG
ood
sign
al is
usu
ally
con
nect
ed to
the
RES
ET s
igna
l.
+3.3
V Vo
ltage
sta
bilis
atio
n
Look
at c
ircui
t con
nect
ed to
out
put v
olta
ge +
3.3V
. Thi
s ci
rcui
t mak
es a
dditi
onal
volta
ge s
tabi
lisat
ion
due
to lo
ss o
f vol
tage
on c
able
s. T
here
are
one
aux
iliary
wire
from
con
nect
or fo
r mea
sure
3.3
V vo
ltage
on
mot
herb
oard
. Nex
t goe
s to
the
curre
nt
regu
lato
r ZIC
1, w
hich
ope
ns Q
13.
For e
xam
ple
whe
n vo
ltage
incr
ease
s (s
mal
l loa
d), t
rans
isto
r Q13
is m
ore
open
ed a
nd n
egat
ive
puls
es a
cros
s D
32
decr
ease
s ou
tput
vol
tage
.
Ove
rvol
tage
circ
uit
This
circ
uit i
s co
mpo
sed
from
Q5,
Q6
and
man
y di
scre
te c
ompo
nent
s. C
ircui
t gua
rds
all o
f out
put v
olta
ges
and
whe
n th
e
som
e lim
it is
exc
eede
d, p
ower
sup
ply
is s
topp
ed.
For e
xam
ple
whe
n I b
y m
ista
ke s
hort-
circ
uit -
5V w
ith +
5V, t
hen
posi
tive
volta
ge g
oes
acro
ss D
10, R
28, D
9 to
the
base
Q6.
This
tran
sist
or is
now
ope
ned
and
open
s Q
5. +
5V fr
om p
in 1
4 IC
1 co
mes
acr
oss
diod
e D
11 to
the
pin
4 IC
1 an
d po
wer
supp
ly is
blo
cked
. Bey
ond
that
goe
s vo
ltage
aga
in to
bas
e Q
6. P
ower
sup
ply
is s
till b
lock
ed, u
ntil
he is
dis
conn
ecte
d fro
m
pow
er li
ne in
put.
ATX
Mot
herb
oard
Pow
er
AT
X po
wer
con
nect
or o
n th
e m
othe
rboa
rd c
onsi
sts
of tw
o ro
w o
f pin
s.
This
con
nect
or fr
om th
e AT
X po
wer
sup
ply
can
only
be
fitte
d in
one
way
.
Color
Pin
Name
Description
1
+3.3
V
Pow
er +
3.3V
2 +3
.3V
Po
wer
+3.
3V
3
GN
D
Gro
und
4
+5V
V
cc +
5V
5
GN
D
Gro
und
6
+5V
V
cc +
5V
7
GN
D
Gro
und
8
PWR
OK
Pow
er G
ood
9
5VSB
+5
V S
tand
by
10
+1
2V
Pow
er +
12V
11
+3.3
V
Pow
er +
3.3V
12
-12V
Po
wer
-12V
13
GN
D
Gro
und
14
PS
-ON
R
emot
e Po
wer
ON
/OFF
15
G
ND
G
roun
d
16
GN
D
Gro
und
17
G
ND
G
roun
d
18
-5V
Po
wer
-5V
19
+5V
V
cc +
5V
20
+5
V
Vcc
+5V
AT P
C P
ower
Sup
ply
1
Ref
eren
ce a
nd S
ourc
es:
• Th
is sc
hem
atic
has
bee
n su
bmitt
ed b
y Zs
olt S
ebes
tyen
AT P
C P
ower
Sup
ply
2
Ref
eren
ce a
nd S
ourc
es:
• Th
is sc
hem
atic
has
bee
n su
bmitt
ed b
y Zs
olt S
ebes
tyen
AT P
C P
ower
Sup
ply
3
Ref
eren
ce a
nd S
ourc
es:
• Th
is sc
hem
atic
has
bee
n su
bmitt
ed b
y Zs
olt S
ebes
tyen
AT P
C P
ower
Sup
ply
4
Ref
eren
ce a
nd S
ourc
es:
• Th
is sc
hem
atic
has
bee
n su
bmitt
ed b
y Zs
olt S
ebes
tyen
AT P
C P
ower
Sup
ply
5
Ref
eren
ce a
nd S
ourc
es:
• Th
is sc
hem
atic
has
bee
n su
bmitt
ed b
y Zs
olt S
ebes
tyen
Oth
er v
alue
s no
t ind
icat
ed o
n sc
hem
atic
are
:
• R
31 =
1 K
Ohm
•
R35
= 1
00 K
Ohm
•
R40
= 3
.3 K
Ohm
•
R34
= 1
00 K
Ohm
•
R36
= 3
.3 K
Ohm
•
R39
= 8
.2 K
Ohm
•
R43
= 2
.2 K
Ohm
•
R25
= 1
KO
hm
• R
20 =
3.9
KO
hm
• R
37 =
2.2
KO
hm
• R
55 =
56
KO
hm
• R
26 =
2.2
KO
hm
• R
27 =
2.2
KO
hm
• R
28 =
1.2
KO
hm
• R
29 =
910
Ohm
•
R13
= 4
.2 K
Ohm
•
R24
= 2
.2 K
Ohm
•
R11
= 3
.3 K
Ohm
•
R12
= 3
.3 K
Ohm
•
R41
= 5
10 O
hm
• V
R1
= 2
KO
hm
• C
18 =
4.7
uF
•
C20
= 1
0 uF
•
C12
= 2
.2 u
F
• C
10 =
1 u
F
• C
13 =
4.7
uF
AT Motherboard Power
(At the Computer)
2x MOLEX 15-48-0106 CONNECTOR at the Computer.
2x MOLEX 90331-0001 CONNECTOR at the Powersupply cables.
P8
Pin Name Color Description
1 PG Orange Power Good, +5 VDC when all voltages has stabilized. 2 +5V Red +5 VDC (or n/c) 3 +12V Yellow +12 VDC 4 -12V Blue -12 VDC 5 GND Black Ground 6 GND Black Ground
P9
Pin Name Color Description
1 GND Black Ground 2 GND Black Ground 3 -5V White or Yellow -5 VDC 4 +5V Red +5 VDC 5 +5V Red +5 VDC 6 +5V Red +5 VDC Note: Pins part number is 08-50-0276, Product specification is PS-90331.