IR3553_15 Datasheet, PDF (9/22 Pages) International Rectifier – 40A Integrated PowIRstage

40A Integrated PowIRstage® IR3553
TYPICAL OPERATING CHARACTERISTICS
Circuit of Figure 32, V_IN=12V, V_OUT=1.2V, ƒ_SW = 400kHz, L=150nH (0.29mΩ), VCC=7V, T_AMBIENT = 25°C, no heat sink, no air flow,
8-layer PCB board of 3.7” (L) x 2.6” (W), no PWM controller loss, no inductor loss, unless specified otherwise.
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92
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81
80
0
5
10
15
20
25
30
35
40
Output Current (A)
Figure 7: Typical IR3553 Efficiency
1.30
9.0
1.25
7.5
1.20
6.0
1.15
4.5
1.10
3.0
1.05
1.5
1.00
0.0
0.95
-1.5
0.90
-3.0
0.85
-4.5
0.80
-6.0
5 6 7 8 9 10 11 12 13 14 15
Input Voltage (V)
Figure 10: Normalized Power Loss vs. Input Voltage
10
9
8
7
6
5
4
3
2
1
0
0
5
10
15
20
25
30
35
40
Output Current (A)
Figure 8: Typical IR3553 Power Loss
1.5
15
1.4
12
1.3
9
1.2
6
1.1
3
1.0
0
0.9
-3
0.8
-6
0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Output Voltage (V)
Figure 11: Normalized Power Loss vs. Output Voltage
Figure 9: Thermal Derating Curve, T_CASE <= 125°C
9 July 16, 2014 | DATASHEET V3.3
1.30
9.0
1.25
7.5
1.20
6.0
1.15
4.5
1.10
3.0
1.05
1.5
1.00
0.0
0.95
-1.5
0.90
-3.0
0.85
-4.5
0.80
-6.0
200 300 400 500 600 700 800 900 1000
Switching Frequency (kHz)
Figure 12: Normalized Power Loss vs. Switching Frequency