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IR3551 Datasheet(PDF) 10 Page - International Rectifier

Part No. IR3551
Description  50A Integrated PowIRstage
Download  22 Pages
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
Logo IRF - International Rectifier

IR3551 Datasheet(HTML) 10 Page - International Rectifier

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July 16, 2013 | DATASHEET V3.2
10
IR3551
50A Integrated PowIRstage®
TYPICAL OPERATING CHARACTERISTICS (CONTINUED)
Circuit of Figure 32, VIN=12V, VOUT=1.2V, ƒSW = 400kHz, L=150nH (0.29mΩ), VCC=7V, TAMBIENT = 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.
Figure 13: Normalized Power Loss vs. VCC Voltage
Figure 14: Power Loss vs. Output Inductor
Figure 15: VCC Current vs. Switching Frequency
Figure 16: Switching Waveform, IOUT = 0A
Figure 17: Switching Waveform, IOUT = 50A
Figure 18: PWM to SW Delays, IOUT = 10A
0.85
0.90
0.95
1.00
1.05
1.10
1.15
120
130
140
150
160
170
180
190
200
210
Output Inductor (nH)
-3.3
-2.2
-1.1
0.0
1.1
2.2
3.3
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
5.00
5.25
5.50
5.75
6.00
6.25
6.50
6.75
7.00
VCC Voltage (V)
-3.3
-2.2
-1.1
0.0
1.1
2.2
3.3
4.4
PWM
2V/div
SW
5V/div
40ns/div
PWM
5V/div
SW
5V/div
GATEL
10V/div
400ns/div
PWM
5V/div
SW
5V/div
GATEL
10V/div
400ns/div
0
10
20
30
40
50
60
70
200
300
400
500
600
700
800
900
1000
fsw (kHz)
Vcc=6.8V
Vcc=5V


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