UC3842T STMICROELECTRONICS [STMicroelectronics], UC3842T Datasheet - Page 7

• Manufacturer Part Number: UC3842T
• Description: HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Figure 10: Output Saturation Voltagevs. Load
Figure 12: Output Waveform.
Figure 14: Oscillator and Output Waveforms.
10%
90%
V
(V)
-1
-2
3
2
1
0
sat
R
C
0
T
T
V
80 s Pulsed Load 120Hz Rate
V
Current.
i
=15V
T
i
A
=-40˚C
T
200
A
=25˚C
8
4
Source Saturation
(Load to Ground)
Sink Saturation
(Load to V
50ns/DIV
PWM
400
I
D
i
)
CLOCK
OSCILLATOR
T
T
600
A
A
5V REG
=25˚C
7
=-40˚C
5
D95IN341
V
C
T
GND
V
GND
A
i
L
i
=15V
I
= 1.0nF
= 25°C
O
(mA)
6
Figure 11: Supply Current vs. Supply Voltage.
Figure 13: Output Cross Conduction
OUTPUT
U3842T - UC3843T - UC3844T - UC3845T
I
V
CC
(mA)
O
20
15
10
I
5
0
i
0
OUTPUT
OUTPUT
CT
CT
10
LARGE R
SMALL R
100ns/DIV
20
T
T
/LARGE C
/SMALL C
D95IN344
30
R
C
V
I
T
Sense
A
FB
T
T
=25˚C
=10K
=3.3nF
T
T
V
C
T
=0V
A
i
L
D95IN342
=0V
100mA/DIV
=30V
= 15pF
= 25°C
20V/DIV
V
i
(V)
7/15