UC3843BD ON Semiconductor, UC3843BD Datasheet - Page 6

• Manufacturer Part Number: UC3843BD
• Description: IC CTRLR CURRENT MODE HP 14SOIC
• Manufacturer: ON Semiconductor

Specifications of UC3843BD

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 275kHz
• Duty Cycle: 96%
• 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: 14-SOIC (3.9mm Width), 14-SOL
• Frequency-max: 275kHz
• Duty Cycle (max): 96 %
• Output Voltage: 4.9 V to 5.1 V
• Output Current: 1000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 500 KHz
• Operating Supply Voltage: 30 V
• Maximum Operating Temperature: + 70 C
• Fall Time: 50 ns
• Minimum Operating Temperature: 0 C
• Rise Time: 50 ns
• Synchronous Pin: No
• Topology: Boost, Flyback, Forward
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: UC3843BDOS

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