UC3843BVDR2 ON Semiconductor, UC3843BVDR2 Datasheet - Page 5

• Manufacturer Part Number: UC3843BVDR2
• Description: IC CTRLR CURRENT MODE HP 14SOIC
• Manufacturer: ON Semiconductor

Specifications of UC3843BVDR2

• 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: -40°C ~ 105°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: + 105 C
• Fall Time: 50 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 50 ns
• Synchronous Pin: No
• Topology: Boost, Flyback, Forward
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: UC3843BVDR2OSTR

2.55 V
2.50 V
2.45 V
9.0
8.5
8.0
7.5
7.0
8.0
5.0
2.0
0.8
80
50
20
10 k
- 55
Freq +
V
T
A
CC
= 25°C
= 15 V
20 k
Figure 4. Oscillator Discharge Current
- 25
Figure 6. Error Amp Small Signal
Ct
versus Oscillator Frequency
f
Vosc
OSC
I Rt
Figure 2. Timing Resistor
T
A
, OSCILLATOR FREQUENCY (kHz)
, AMBIENT TEMPERATURE (°C)
0
Transient Response
) Ct
versus Temperature
50 k
1
25
Idis*I Rt
0.5 ms/DIV
Vosc
100 k
50
200 k
Where: Vosc = 1.7 V
75
V
V
Idis = 8.3 mA
V
A
T
CC
OSC
I
V
A
CC
Rt
500 k
= 25°C
= -1.0
= 15 V
100
= 2.0 V
= 15 V
= Vref/Rt
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
10 k
0.8
1. C
2. C
3. C
4. C
5. C
6. C
7. C
T
T
T
T
T
T
T
1.0
= 10 nF
= 5.0 nF
= 2.0 nF
= 1.0 nF
= 500 pF
= 200 pF
= 100 pF
Figure 5. Maximum Output Duty Cycle
I
20 k
dischg
Figure 7. Error Amp Large Signal
versus Oscillator Frequency
= 7.5 mA
f
OSC
Figure 3. Output Deadtime
I
dischg
versus Timing Resistor
Transient Response
, OSCILLATOR FREQUENCY (kHz)
R
T
50 k
, TIMING RESISTOR (kW)
= 8.8 mA
2.0
1.0 ms/DIV
100 k
3.0
1
200 k
4.0
V
C
T
A
CC
T
V
A
T
2
= 25°C
V
T
= 3.3 nF
5.0 6.0 7.0 8.0
A
V
CC
A
CC
= 15 V
500 k
= -1.0
= 25°C
= 25°C
5
= 15 V
= 15 V
3
6
4
1.0 M
7