UC3845AN STMicroelectronics, UC3845AN Datasheet - Page 7

• Manufacturer Part Number: UC3845AN
• Description: IC CURR-MODE PWM CTRLR 8-MINIDIP
• Manufacturer: STMicroelectronics

Specifications of UC3845AN

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 50%
• Voltage - Supply: 8.2 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3083-5

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