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IR3871MTRPBF Datasheet(PDF) 7 Page - International Rectifier

Part # IR3871MTRPBF
Description  WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3871MTRPBF Datasheet(HTML) 7 Page - International Rectifier

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7
IR3871MPBF
TYPICAL OPERATING DATA
Tested with demoboard shown in Figure 7, VIN = 12V, VCC = 5V, Vout = 1.05V, Fs = 300kHz, TA = 25oC, no airflow,
unless otherwise specified
Figure 3. Switching Frequency vs. Output
Current
Figure 1. Efficiency vs. Output Current for
V
OUT = 1.05V
Figure 2. Efficiency vs. Output Current for
VIN = 12V
Figure 4. Frequency vs. R
FF
Figure 5. Output Voltage Regulation vs.
Output Current
Figure 6. Output Voltage Regulation vs.
Input Voltage at I
OUT = 8A
35%
45%
55%
65%
75%
85%
95%
0.01
0.1
1
10
Output Current (A)
EFF @ 19VIN
EFF @ 12VIN
EFF @ 8VIN
1.048
1.049
1.050
1.051
1.052
0
1
2
3
4
5
6
7
8
Output Current (A)
VOUT @ 19VIN
VOUT @ 12VIN
VOUT @ 8VIN
0
50
100
150
200
250
300
350
0
1
2
3
4
5
6
7
8
Output Current (A)
1.048
1.049
1.050
1.051
1.052
6
8
10
12
14
16
18
20
Input Voltage (V)
0
200
400
600
800
1000
1200
200
400
600
800
1000
Frequency (kHz)
5.0 Vout
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
40%
50%
60%
70%
80%
90%
100%
0.01
0.1
1
10
Output Current (A)
EFF @ 3.3VOUT, L = 3.3µH
EFF @ 1.5VOUT, L = 2.2µH
EFF @ 1.05VOUT, L = 1.5µH


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