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E-UC3845BD1013TR

P1-P3P4-P6P7-P9P10-P12P13-P15
0 200 400 600 I
O
(mA)
0
1
2
3
-2
-1
V
sat
(V)
D95IN341
V
i
=15V
80µs 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: Output Saturation Voltagevs. Load
Current.
0 102030V
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 Current vs. Supply Voltage.
Figure 12: Output Waveform. Figure 13: Output Cross Conduction
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: Oscillator and Output Waveforms.
V
i
=15V
C
L
= 1.0nF
T
A
= 25°C
90%
10%
50ns/DIV
V
i
=30V
C
L
= 15pF
T
A
= 25°C
V
O
I
CC
100ns/DIV
100mA/DIV
20V/DIV
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
7/15
Figure 15 : Error Amp Configuration.
Z
i
Z
f
1mA
2
1
V
FB
COMP
2.5V
D95IN345
+
-
Figure 16 : Under Voltage Lockout.
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 : Current Sense Circuit .
ERROR
AMPL.
2R
R1V
CURRENT
SENSE
COMPARATOR
1
CURRENT
SENSE
COMP
CR
S
R
3
5
GND
I
S
D95IN347
Peak current (i
s
) is determined by the formula
1.0 V
I
S max
≈
R
S
A small RC filter may be required to suppress switch transients.
During UVLO, the Output is low
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
8/15
Figure 18 : Slope Compensation Techniques.
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 : Isolated MOSFET Drive and Current Transformer Sensing.
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
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
9/15
P1-P3P4-P6P7-P9P10-P12P13-P15

E-UC3845BD1013TR

Mfr. #:
Buy E-UC3845BD1013TR
Manufacturer:
STMicroelectronics
Description:
Switching Controllers 0.5mA Current Mode
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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