UC3843AN ON Semiconductor, UC3843AN Datasheet - Page 6

• Manufacturer Part Number: UC3843AN
• Description: IC CTRLR CURRENT MODE HP 8DIP
• Manufacturer: ON Semiconductor
• Type: High Performance Current Mode Controllersr

Specifications of UC3843AN

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 96%
• Voltage - Supply: 8.2 V ~ 25 V
• Buck: No
• Boost: No
• 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
• Output Voltage Range: 4.9 V to 5.1 V
• Input Voltage Range: 30 V
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: UC3843ANOS

− 20
−4.0
−8.0
100
−12
−16
−20
−24
80
60
40
20
0
0
10
0
Figure 8. Error Amp Open Loop Gain and
Figure 12. Reference Load Regulation
Figure 10. Reference Voltage Change
100
20
I
ref
T
Phase versus Frequency
, REFERENCE SOURCE CURRENT (mA)
A
= 125°C
versus Source Current
1.0 k
40
Gain
f, FREQUENCY (Hz)
2.0 ms/DIV
T
10 k
A
60
= 25°C
UC3842A, UC3843A, UC2842A, UC2843A
100 k
V
I
T
O
80
A
CC
= 1.0 mA to 20 mA
T
= 25°C
V
V
R
T
A
= 15 V
A
CC
O
L
= 55°C
= 25°C
= 100 K
= 2.0 V to 4.0 V
= 15 V
V
1.0 M
Phase
CC
100
= 15 V
http://onsemi.com
10 M
120
0
30
60
90
120
150
180
6
110
1.2
1.0
0.8
0.6
0.4
0.2
90
70
50
0
−55
0
Figure 11. Reference Short Circuit Current
V
Figure 9. Current Sense Input Threshold
CC
Figure 13. Reference Line Regulation
−25
= 15 V
versus Error Amp Output Voltage
T
A
V
= 125°C
T
O
2.0
A
T
, ERROR AMP OUTPUT VOLTAGE (V)
A
= 25°C
0
, AMBIENT TEMPERATURE (°C)
versus Temperature
2.0 ms/DIV
25
T
A
= −55°C
4.0
50
V
T
A
CC
75
= 25°C
= 12 V to 25 V
6.0
V
R
CC
L
≤ 0.1 W
= 15 V
100
125
8.0