UC3845BVD ON Semiconductor, UC3845BVD Datasheet - Page 5

• Manufacturer Part Number: UC3845BVD
• Description: IC CTRLR CURRENT MODE HP 14SOIC
• Manufacturer: ON Semiconductor

Specifications of UC3845BVD

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 275kHz
• Duty Cycle: 50%
• Voltage - Supply: 8.2 V ~ 25 V
• Buck: No
• Boost: Yes
• Flyback: Yes
• Inverting: Yes
• 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): 48 %
• 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: UC3845BVDOS

- 4.0
- 8.0
- 20
- 12
- 16
- 20
- 24
100
80
60
40
20
0
0
10
0
Figure 6. Error Amp Open Loop Gain and
Figure 10. Reference Load Regulation
100
Figure 8. Reference Voltage Change
20
I
ref
Phase versus Frequency
T
, REFERENCE SOURCE CURRENT (mA)
A
versus Source Current
= 125°C
1.0 k
40
f, FREQUENCY (Hz)
Gain
2.0 ms/DIV
10 k
60
T
A
= 25°C
V
I
T
O
100 k
A
CC
= 1.0 mA to 20 mA
= 25°C
80
= 15 V
V
V
R
T
A
CC
O
L
T
= 25°C
= 100 k
= 2.0 V to 4.0 V
A
= 15 V
V
= - 55°C
CC
1.0 M
100
= 15 V
Phase
http://onsemi.com
10 M
120
120
150
180
30
60
90
0
5
110
90
70
50
1.2
1.0
0.8
0.6
0.4
0.2
- 55
0
0
V
Figure 9. Reference Short Circuit Current
CC
Figure 7. Current Sense Input Threshold
Figure 11. Reference Line Regulation
- 25
= 15 V
T
versus Error Amp Output Voltage
A
T
A
= 125°C
= 25°C
V
2.0
O
, ERROR AMP OUTPUT VOLTAGE (V
T
A
0
versus Temperature
, AMBIENT TEMPERATURE (°C)
T
25
2.0 ms/DIV
A
= - 55°C
4.0
50
V
T
A
CC
75
= 25°C
Ä Ä Ä Ä
Ä Ä Ä Ä
6.0
= 12 V to 25 V
V
R
CC
L
O
≤ 0.1 W
100
)
= 15 V
125
8.0