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MC44608P75
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
MC44608
http://onsemi.com
10
EQUA
TION
7
d
BM
=
1
1
+
⎪
⎧
⎩
I
ccS
+
I
G
I
stup
×
⎪
⎧
⎩
k
S
∕
Stup
+
k
S
∕
L
×
I
stup
I
ccL
+
I
pin3
⎪
⎫
⎭
⎪
⎫
⎭
EQUA
TION
8
d
BM
=
1
1
+
⎪
⎪
⎨
⎧
⎩
k1
+
I
G
I
stup
×
⎪
⎪
⎪
⎪
⎧
⎩
k
S
∕
Stup
+
(k
S
∕
L
×
1
k2
+
I
pin3
I
stup
)
⎪
⎪
⎪
⎪
⎫
⎭
⎪
⎪
⎬
⎫
⎭
where:
k1
=
I
ccs
/I
stup
k2
=
I
ccL/
I
stup
k
S/Stup
=(
V
stup
-
-
UVLO2)/(V
stup
-
-
UVLO1)
k
S/L
=
(UVLO1-
-
UVLO2)/(V
stup
-
-
UVLO1)
PULSED
MODE
CURRENT
SENSE
CLAMPING
LEVEL
Equations
9,
10,
1
1
and
12
allow
the
calculation
of
the
R
cs
value
for
the
desired
maximum
current
peak
v
alue
during
the
SMPS
standby
mode.
EQUA
TION
9
Ipk
stby
=
V
cs–th
−
(R
cs
×
I
cs
)
R
S
where:
V
cs-
-
th
is
the
C
S
comparator
threshold
I
cs
is
the
C
S
internal
current
sourc
e
R
S
is
the
s
ensing
resistor
R
cs
is
the
r
esistor
connected
between
pin
2
and
R
S
EQUA
TION
10
Ipk
stby
=
V
cs–th
×
1
−
R
cs
×
I
cs
V
cs–th
R
S
EQUA
TION
1
1
Ipk
stby
=
V
cs–th
×
1
−
(R
cs
×
Y
cs–stby
)
R
S
where:
Y
cs-
-
stby
=I
cs
/V
cs-
-
th
T
aking
into
ac
count
the
circuit
propagation
delay
(
δ
t
cs
)
and
the
Power
Switch
reaction
time
(
δ
t
ps
):
EQUA
TION
12
Ipk
stby
=
V
cs–th
×
1
−
(R
cs
×
Y
cs–stb
y
)
R
S
+
V
in
×
(
δ
t
cs
+
δ
t
ps
)
L
p
MC44608
http://onsemi.com
11
Figure
9.
Output
Switching
Speed
10
Time
(nS)
20
30
40
50
60
10
1
1
12
13
14
15
t_fall
t_rise
Pin6
V
CC
V
oltage
(V)
Figure
10.
Frequency
Stability
65.0
Frequency
67.0
71.0
75.0
77.0
79.0
10
1
1
12
13
14
15
V
CC
V
oltage
(V)
73.0
69.0
--
2
5
C
25
C
85
C
Figure
1
1.
Duty
Cycle
Control
0
Switching
Duty
Cycle
(%)
10
40
60
70
80
0.0
0.5
1.0
1.5
2.0
2.5
Current
Inj
ected
in
Pin3
(mA
)
50
20
--
2
5
C
25
C
85
C
90
30
4.98
Vpin3
(V)
0.5
1.5
2
2.5
Current
Injected
in
Pin
3
(mA
)
1
4.99
5.00
5.01
5.02
5.03
5.04
5.05
5.06
5.07
5.08
--
2
5
C
25
C
85
C
Figure
12.
Vpin3
During
the
Work
ing
Period
1.5
Vpin3
Voltage
(V)
--
1
.
6
Current
Injected
in
Pin
3
(mA
)
--
2
5
C
25
C
85
C
-
-
1.4
-
-
1.2
-
-
1.0
-
-
.08
-
-
.06
-
-
.04
-
-
.02
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Figure
13
.
Vpin3
During
the
Latched
Off
Period
Figure
14.
Device
Consumption
when
Switching
3.00
Pin6
Current
(mA)
3.20
3.80
4.20
4.40
4.60
10
1
1
12
13
14
15
Pin6
V
CC
V
oltage
(V)
4.00
3.40
--
2
5
C
25
C
85
C
4.80
3.60
MC44608
http://onsemi.com
12
5.00
--
I
c
c
(
m
A
)
6.00
7.00
8.00
10.00
11
.
0
0
0
100
200
300
400
500
Vi
P
in8
V
oltage
(Vi)
--
2
5
C
25
C
85
C
9.00
Figure
15.
High
V
oltage
Current
Source
5.00
Switching
Duty
Cycle
(%)
6.00
7.00
8.00
11
.
0
0
0
100
200
300
400
500
Vi
P
in
V
oltage
(V)
--
2
5
C
25
C
85
C
9.00
Figure
16.
Overload
Burst
Mode
10.00
12.00
Figure
17.
Hiccup
Mode
Waveforms
The
data
in
Figure
16
corresponds
to
the
waveform
in
Figure
17.
The
Figur
e
17
shows
V
CC
,I
CC
,I
sense
(pin
2)
and
V
out
(pin
5).
V
out
(pin
5)
in
fact
shows
the
envelope
of
the
output
switching
pulses.
This
mode
corr
esponds
to
an
overload
condition.
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
MC44608P75
Mfr. #:
Buy MC44608P75
Manufacturer:
ON Semiconductor
Description:
Switching Controllers 75KHz High Voltage
Lifecycle:
New from this manufacturer.
Delivery:
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