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E-UC2845BD1013TR
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
0
200
400
600
I
O
(mA)
0
1
2
3
-2
-1
V
sat
(V)
D95IN341
V
i
=15V
80
µ
s Pulsed Load 120Hz Rate
T
A
=-40˚C
T
A
=25˚C
V
i
T
A
=-40˚C
T
A
=25˚C
GND
Sink Saturation
(Load to V
i
)
Source Saturation
(Load to Ground)
Figure 10:
O
ut
put S
at
ur
at
ion V
olt
agevs. Load
Current.
0
1
02
03
0
V
i
(V)
0
5
10
15
20
I
i
(mA)
UCX843/45
UCX842/44
R
T
=10K
C
T
=3.3nF
V
FB
=0V
I
Sense
=0V
T
A
=25˚C
D95IN342
Figure 11:
Supply
Curr
ent v
s.
S
upply
Voltage.
Figure 12:
O
ut
put W
avefor
m
.
Figure 13:
Output Cross Conduc
tion
5V REG
OSCILLATOR
PWM
CLOCK
8
4
5
6
R
T
C
T
GND
OUTPUT
7
V
i
I
D
CT
OUTPUT
LARGE R
T
/SMALL C
T
CT
OUTPUT
SMALL R
T
/LARGE C
T
D95IN344
Figure 14:
O
scillator and Output Waveforms.
V
i
=15V
C
L
=
1.
0nF
T
A
= 25°
C
90%
10%
50ns/D
IV
V
i
=30V
C
L
= 15
pF
T
A
= 25
°C
V
O
I
CC
100ns
/DIV
100m
A/DIV
20
V/DIV
UC2842
B/3B/4B
/5B - U
C3842B/
3B/4B/5
B
7/15
Figure 15 :
Error A
mp Conf
igurat
ion.
Z
i
Z
f
1mA
2
1
V
FB
COMP
2.5V
D95IN345
+
-
Figure 16 :
Under V
oltage Lo
ckout
.
UC3842B
UC3844B
UC3843B
UC3845B
16V
8.4V
10V
7.6V
V
ON
V
OFF
V
i
ON/OFF COMMAND
TO REST OF IC
7
<0.5mA
<17mA
I
CC
V
CC
V
OFF
V
ON
D95IN346
Figure 17 :
Curre
nt
S
ense Cir
cuit .
ERROR
AMPL.
2R
R1
V
CURRENT
SENSE
COMPARATOR
1
CURRENT
SENSE
COMP
C
R
S
R
3
5
GND
I
S
D95IN347
Peak
curre
nt (i
s
) is
determine
d by the f
or
m
ula
1.0 V
I
S ma
x
≈
R
S
A sma
ll RC fi
lter may b
e required
to
s
uppr
ess swit
ch transi
ents.
Duri
ng UVLO, the Output is low
UC2842
B/3B/4B
/5B - UC3842B/
3B/4B/5B
8/15
Figure 18 :
Slop
e Compe
nsation
Techni
ques.
R
S
R
1
I
S
R
SLOPE
C
T
R
T
V
REG
8
R
T
/C
T
I
SENSE
4
3
5
GND
R
S
R
1
I
S
R
SLOPE
C
T
R
T
V
REG
8
R
T
/C
T
I
SENSE
4
3
5
GND
D95IN348
Figure 19 :
Isolat
ed MOSF
ET D
r
iv
e and Cu
rrent Tran
sform
er Sens
ing.
7
6
COMP/LATCH
ISOLATION
BOUNDARY
D95IN349
5.0V
ref
V
CC
+
-
+
-
Q
S
R
+
-
3
R
R
S
N
S
C
V
in
Q1
N
P
V
GS
Waveforms
+
0
+
0
-
-
50% DC
25% DC
I
pk
=
V
(pin 1)
-1.4
3R
S
N
S
N
P
()
UC3842B
UC3842B
UC2842
B/3B/4B
/5B - U
C3842B/
3B/4B/5
B
9/15
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
E-UC2845BD1013TR
Mfr. #:
Buy E-UC2845BD1013TR
Manufacturer:
STMicroelectronics
Description:
Switching Controllers 0.5mA Current Mode
Lifecycle:
New from this manufacturer.
Delivery:
DHL
FedEx
Ups
TNT
EMS
Payment:
T/T
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