UC3845AN STMicroelectronics, UC3845AN Datasheet - Page 6

• 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 6: Current Sense Input Threshold vs. Er-
Figure 8: Reference Short Circuit Current vs.
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
Figure 4: Oscillator Discharge Current vs. Tem-
6/15
I
(mA)
100
(mA)
dischg
I
SC
90
80
70
60
50
8.5
8.0
7.5
7.0
V
1.0
0.8
0.6
0.4
0.2
0.0
(V)
th
-55
0
-55
T
ror Amp Output Voltage.
Temperature.
perature.
V
A
-25
i
-25
=125˚C
=15V
T
A
=25˚C
2
0
0
T
A
=-40˚C
25
25
4
50
50
V
R
V
V
i
L
=15V
i
OSC
=15V
75
75
0.1
6
=2V
100 T
100 T
D95IN340
D95IN338
D95IN335
V
O
A
A
(V)
(˚C)
(˚C)
Figure 5: Error Amp Open-Loop Gain and
Figure 7: Reference Voltage Change vs.
(dB)
-20
80
60
40
20
60
50
40
30
20
10
0
0
10
0
Phase vs. Frequency.
Source Current.
T
100
20
A
=125˚C
40
1K
Gain
10K
60
T
A
=-40˚C
V
V
R
T
100K
V
A
80
i
O
L
=15V
=100K
=25˚C
i
=2V to 4V
=15V
100 I
1M
Phase
D95IN337
D95IN339
ref
f(Hz)
(mA)
120
150
180
30
60
90