IR3871M datasheet(7/21 Pages) IRF

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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

OUT = 1.05V

Figure 2. Efficiency vs. Output Current for

VIN = 12V

Figure 4. Frequency vs. R

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

Output Current (A)

EFF @ 19VIN

EFF @ 12VIN

EFF @ 8VIN

1.048

1.049

1.050

1.051

1.052

Output Current (A)

VOUT @ 19VIN

VOUT @ 12VIN

VOUT @ 8VIN

100

150

200

250

300

350

Output Current (A)

1.048

1.049

1.050

1.051

1.052

Input Voltage (V)

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

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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