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IR3558 Datasheet(PDF) 10 Page - International Rectifier |
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IR3558 Datasheet(HTML) 10 Page - International Rectifier |
10 / 21 page September 10, 2012 | FINAL DATASHEET 10 IR3558 45A Integrated PowIRstage® TYPICAL OPERATING CHARACTERISTICS (CONTINUED) Circuit of Figure 32, VIN=12V, VOUT=1.2V, ƒSW=400kHz, L=150nH (0.29mΩ), VCC=5V, HVCC=LVCC=7V, TAMB=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 14: Normalized Power Loss vs. HVCC & LVCC Voltage Figure 15: Power Loss vs. Output Inductor 0.0 0.5 1.0 1.5 2.0 2.5 3.0 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 fsw (kHz) Vcc=5.5V Vcc=5V Figure 16: VCC Current vs. Switching Frequency 0 5 10 15 20 25 30 35 40 45 50 55 60 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 fsw (kHz) LVCC=12V LVCC=7V LVCC=5V Figure 17: LVCC Current vs. Switching Frequency 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 fsw (kHz) HVCC=12V HVCC=7V HVCC=5V Figure 18: HVCC Current vs. Switching Frequency Figure 19: Switching Waveform in Tri-state Mode, IOUT = 0A PWM 5V/div SW 5V/div GATEL 10V/div 400ns/div 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 HVCC and LVCC Voltage (V) -3.3 -2.2 -1.1 0.0 1.1 2.2 3.3 4.4 5.5 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 |
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