UC3842AN STMicroelectronics, UC3842AN Datasheet - Page 9

• Manufacturer Part Number: UC3842AN
• Description: IC CURR-MODE PWM CTRLR 8-MINIDIP
• Manufacturer: STMicroelectronics

Specifications of UC3842AN

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 100%
• Voltage - Supply: 11.5 V ~ 25 V
• Buck: No
• Boost: Yes
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Frequency-max: 500kHz
• Duty Cycle (max): 100 %
• Output Current: 1000 mA
• Mounting Style: Through Hole
• Switching Frequency: 500 KHz
• Maximum Operating Temperature: + 150 C
• Fall Time: 50 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 50 ns
• Synchronous Pin: No
• Topology: Boost, Buck, Flyback, Forward
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3078-5

Figure 18 : Isolated MOSFET Drive and Current Transformer Sensing.
Figure 17 : Slope Compensation Techniques.
R
I
S
S
R
R
5.0V ref
+
+
SLOPE
-
-
1
COMP/LATCH
R
S
Q
R
C
+
-
I
R
SENSE
T
T
V
T
REG
V
/C
CC
T
7
8
4
3
UC3842A
D95IN349
5
GND
6
3
C
BOUNDARY
ISOLATION
R
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
R
S
R
I
S
S
R
R
SLOPE
1
N
S
Q1
V
in
N
P
R
C
I
R
T
T
SENSE
V
T
+
0
-
I
REG
/C
pk
50% DC
=
T
V
V
(pin 1)
8
4
3
GS
3R
UC3842A
Waveforms
S
-1.4
5
+
0
-
( )
GND
25% DC
N
N
D95IN348
S
P
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