UC3843AN ON Semiconductor, UC3843AN Datasheet - Page 5

• 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

2.55 V
2.45 V
2.5 V
8.0
5.0
2.0
0.8
9.0
8.5
8.0
7.5
7.0
80
50
20
10 k
−55
V
T
A
CC
= 25°C
Figure 4. Oscillator Discharge Current
= 15 V
−25
20 k
Figure 6. Error Amp Small Signal
Figure 2. Timing Resistor versus
f
OSC
T
A
, AMBIENT TEMPERATURE (°C)
, OSCILLATOR FREQUENCY (Hz)
Oscillator Frequency
0
Transient Response
versus Temperature
50 k
0.5 ms/DIV
25
100 k
UC3842A, UC3843A, UC2842A, UC2843A
50
200 k
75
V
A
T
V
V
V
A
CC
CC
OSC
= −1.0
= 25°C
500 k
= 15 V
= 15 V
100
= 2.0 V
http://onsemi.com
1.0 M
125
5
3.0 V
2.5 V
2.0 V
100
100
5.0
2.0
1.0
50
20
10
90
80
70
60
50
40
800
10 k
I
dischg
V
T
A
CC
V
C
T
1.0 k
= 25°C
A
CC
T
Figure 5. Maximum Output Duty Cycle
= 15 V
= 25°C
= 3.3 nF
Figure 7. Error Amp Large Signal
20 k
= 7.2 mA
Figure 3. Output Deadtime versus
= 15 V
I
dischg
f
OSC
versus Timing Resistor
Transient Response
= 9.5 mA
Oscillator Frequency
, OSCILLATOR FREQUENCY (Hz)
R
T
50 k
, TIMING RESISTOR (W)
2.0 k
0.1 ms/DIV
100 k
3.0 k
200 k
4.0 k
V
A
T
A
V
CC
500 k
= −1.0
= 25°C
= 15 V
6.0 k
1.0 M
8.0 k