UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
Figure 9:
Output Saturation Voltage vs. Load
Current.
V
sat
(V)
D95IN341
Figure 10:
Supply Current vs. Supply Voltage.
I
i
(mA)
20
D95IN342
V
i
-1
-2
Source Saturation
(Load to Ground)
T
A
=25°C
T
A
=-40°C
V
i
=15V
80µs Pulsed Load 120Hz Rate
15
R
T
=10K
C
T
=3.3nF
V
FB
=0V
I
Sense
=0V
T
A
=25°C
UCX843/45
10
2
1
0
0
T
A
=-40°C
T
A
=25°C
5
Sink Saturation
(Load to V
i
)
200
400
600
GND
0
I
O
(mA)
0
10
UCX842/44
3
20
30
V
i
(V)
Figure 11:
Output Waveform.
Figure 12:
Output Cross Conduction
V
i
=30V
C
L
= 15pF
T
A
= 25°C
V
O
20V/DIV
90%
V
i
=15V
C
L
= 1.0nF
T
A
= 25°C
I
CC
10%
50ns/DIV
100ns/DIV
100mA/DIV
Figure 13:
Oscillator and Output Waveforms.
V
i
7
8
5V REG
PWM
R
T
CLOCK
4
OSCILLATOR
I
D
C
T
5
GND
D95IN344
CT
OUTPUT
6
OUTPUT
LARGE R
T
/SMALL C
T
CT
OUTPUT
SMALL R
T
/LARGE C
T
7/15
STMICROELECTRONICS [ STMICROELECTRONICS ]
