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Wh
e
n p
i
n
s
1
of
U
1950A
a
nd
13
of
U
19508
are
low,
no
d
r
ive
is
a
pp
lie
d
to
t
h
e
output
stage
.
W
it
h o
n
e
gate
o
u
t
pu
t
h
ig
h
a
nd
t
h
e
ot
h
e
r
low,
base
dr
ive
is
a
pp
lie
d to
o
n
eout
p
ut
t
r
a
n
sisto
r
.
I
npu
t
pins
4an
d
11
co
nnecttot
h
ewait
flip-flo
p
,
U
1940
Α
. Ι
npu
t
-
p
i
n
s
3a
nd
12
co
nn
ect
to
019408,
t
h
e
d
ea
d
ti
m
e
m
u
ltivi
br
ato
r
.
I
npu
t
p
i
n
s 5
a
nd 10
connect
to
t
h
e
outpu
t
of
t
h
e
sto
p
m
o
nostab
le,
U
1951A
.
P
i
n
s 2
a
nd 9
co
nn
ect
to
t
h
e co
mp
leme
n
t
outpu
ts of
t
h
e
d
ivi
d
e-
b
y-2flip-
flo
p
,
U1951
B
.
W
it
h
any
o
n
e
o
r
α
11
of
t
h
ese
i
np
uts
h
ig
h
,
t
h
e
o
u
t
pu
t
li
n
es
a
r
e
Ιοω
αη
d
no
d
rive
is
app
lie
d
to
on
e
o
r
b
ot
h
of
t
h
e
o
u
t
pu
t t
r
a
n
sisto
r
s
.
T
h
e
d
ead time
m
u
ltivi
br
ato
r
ci
r
c
u
it
r
y d
etermi
n
es
t
h
e
m
i
n
imum
off
time
of
t
h
e
o
u
t
p
ut
t
r
a
n
sisto
r
s
.
Dea
d
time
is
n
ecessary
to
allow
o
n
e
o
u
t
pu
t
tra
n
sisto
r
to
co
mp
letely
t
urn
off
befo
r
e
t
h
e
ot
h
e
r
t
urn
s
on
.
At
start
up,
t
h
e
Α
i
np
u
t
(p
i
n
12)
of
019408
goes
low
.
Th
is
allows
U
1940
B
totrigge
r
on
t
h
e
cloc
k
sig
n
al
at
t
h
e
Β
in
pu
t
(p
i
n
11)
.
T
h
e
mi
n
i
mu
m
ti
m
ingp
e
r
io
d
of
U
1
940
B
,
d
ete
r
mi
n
ed b
y
R
1930a
nd C2040,
is
5μ
s
.
T
h
is
pu
lse
wi
d
t
h
is
le
n
gt
h
e
n
e
d
by
C2050,
C
R
2040
and
C
R
2043
as
t
he voltage
on
C2051
and
C2060
is
d
ec
r
ease
d
.
T
h
e
p
ulse
wi
d
t
h
of
t
h
e p
owe
r
s
upp
ly
o
u
t
pu
t
va
r
ies
fo
r
soft
start
a
nd
p
ower
limit
.
Wh
e
n
pin
10
of
U1940
B
is
h
ig
h
,
bot
h
ou
t
pu
t t
r
a
n
sisto
r
s
a
r
e
off
.
Dea
d
time
o
r
o u
t
pu
t t
r
an
sisto
r
offtimeis
m
axim
u
m
wit
h
C2051
and
C2060
d
isc
h
a
r
ged
a
nd
m
i
n
im
um
c
h
a
r
ge
d
.
T
h
e
o
u
t
pu
t
p
ower
availa
b
le
g
r
adu
ally
i
n
c
r
eases
as
t
h
ese
ca
p
acito
r
s ch
a
r
ge
dur
i
n
g
soft
start
.
T
h
e
soft
start
k
eeps
h
ig
h
i
npu
t
c
urr
e
n
ts
to cap
acito
r
s
f
r
o
m
d
amagi
n
g
ci
r
c
u
it
com
p
o
n
e
n
ts
.
Wh
e
n
p
i
n
6
of
t
h
e
wait
mu
ltivi
br
ator
U
1
940A
goes
h
ig
h
for
any
r
eason
(fa
u
lt),
p
i
n
8
of
U
1840D
goes
low
disc
h
a
r
gi
n
g
C2051
a
n
d
C2060
.
Und
e
r
n
ormal
o
p
e
r
atio
n
,
w
h
e
n
p
owe
r
is
t
urn
e
d
on,
C2051
a
nd
C2060
c
harge to
t
h
e
voltage
at
p
i
n
8
of
U
1840D
as
d
etermi
n
e
d
by
R
1953
and
R
2060
.
T
h
is
ta
k
es
a
ppr
oximately
1/2
seco
nd
.
Fig
.
32
. I
npu
t
l
i
ne
co
nn
ections
fo
r
110V
a
nd
220 V
ope
r
atio
n
.
O
u
t
pu
t
R
egulato
r
T
heory
of
O
p
e
r
atio
n
-
ΤΜ
5006
Fu
ll
wave
b
ri
d
ge
r
ectif
i
e
r
fo
r
220
V
ac
li
ne
.
V
oltage
do
ub
le
r
fo
r
110 V
ac
l
i
n
e
2950-13
T
h
e
p
owe
r
li
m
it
co
n
t
r
ol is
R
2060
.
F
o
r
maxim
u
m
p
owe
r
,
t
h
is
co
n
t
r
ol
m
u
st
b
e
in
t
h
e
f
u
lly
cloc
k
wise p
ositio
n
(
m
axim
u
m
r
esista
n
ce)
.
F
o
r
servici
n
g
t
h
e
co
n
t
r
ol
ca
n
be
a
dju
sted
fo
r r
e
du
ce
d
p
owe
r
o
u
t
pu
t
levels
.
T
h
is is
ac-
co
mp
lis
h
e
d
b
y
r
e
d
uci
ng
t
h
e
resista
n
ce
of
R
2060,
li
m
iti
n
g
t
h
e
voltage ac
r
oss
C2051
and
C20
6
0
.
Th
e
pur
pose
of
flip-flo
p
U1951
A
is
to
va
r
yt
h
e
οη
ti
me
of
t
h
e
out
pu
t t
r
a
n
sisto
r
s
co
n
siste
n
t
wit
h
t
h
eo
u
t
pu
t
voltage
level
.
Wh
e
n p
i
n
6
of
U
1951A
goes
h
ig
h
,
p
i
n
1
also
goes
h
ig
h
.
T
h
is
actio
n
shu
ts
d
ow
n
t
h
e
b
ase
d
rive
ci
r
c
u
it
r
y,
r
e
d
uci
n
g p
owe
r
outpu
t
.
T
h
e
le
n
gt
h
of
ti
m
e
pi
n 6
r
emai
n
s
h
ig
h
is
co
n
t
r
olle
d
b
y
t
h
e
O
u
t
p
ut
R
egu
lato
r
ci
r
c
u
it
r
y
.
T
h
e
r
isi
n
g
portio
n
of
t
h
e
wavefo
rm
at
p
i
n
4
of
U
1951A
resets
t
h
e
flip-flo
p
fo
r
α
low
co
nd
itio
n
at
p
i
n
1
.
F
lip-flo
p
U
1951
B
d
ivi
des
t
h
e 40
kH
zo
u
t
p
ut
wavefo
r
m
f
r
om
U
1940
B to 20
kH
z
.
T
h
e
pu
lse
from
t
h
e
d
ea
d
ti
m
e
m
u
ltivi
br
ato
r
,
U
1940
B
,
is
applied
tot
h
ecloc
k
te
r
min
al
(p
i
n
11)
of
019518
.
T
h
e
O
terminal
of
U1951
Β
is
co
nn
ecte
d
to
its
Din
pu
t
.
T
h
e
m
u
ltivi
br
ato
r
U1951
Btoggles
on the
rising
ed
ges
of
t
h
e dea
d
time
mu
ltivi
br
ato
r
(0194013)
o
u
t
pu
t
.
T
h
e 40 kH
z
cloc
k
oscillato
r
,
w
h
ic
h
pr
ovi
d
es
t
h
e
b
asic
timi
n
g
n
ecessa
r
y
fo
r
t
h
e
co
n
t
r
ol
ci
r
cuit
r
y, is
co
mp
ose
d
of
U1840A,
Β
and
C
.
F
ee
db
ac
k
goes
f
r
om
p
i
n
6
of
U
1840C
and
p
i
n
4
of
U
18408t
ο
ρίη
1
of
U
1840
Α
.
T
h
e
outpu
t
voltage
at
p
i
n
4
of
U
1840
B
is
h
ig
h
fo
r
a
b
o
u
t
4
μ
s
a
nd
low
ab
o
u
t
21
μ
s
.
T
h
is
non-symmetrical
d
uty
cycle
is
accom
p
lis
h
e
d
by
C
R
1850
and
is
n
ecessa
r
y fo
r
pr
o
p
e
r
o
p
e
r
atio
n
of
U
1940
B
.