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Product # PQ48020HGA40 Phone 1-888-567-9596 Doc.# 005-2HG420C Rev. C 12/17/02 Page 5 Half Half Brick Brick Performance Curves 48Vin 2.0Vout 40A 60 65 70 75 80 85 90 95 100 0 4 8 12 162024 2832 3640 Load Current (A) 36 Vin 48 Vin 75 Vin Figure 1: Efficiency at nominal output voltage vs. load current for min- imum, nominal, and maximum input voltage at 25°C. 82 83 84 85 86 87 88 89 90 0 100 200 300 400 500 Air Flow (LFM) 25 C 40 C 55 C Figure 2: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage). 0 2 4 6 8 10 12 14 16 0 4 8 1216 2024 2832 3640 Load Current (A) 36 Vin 48 Vin 75 Vin Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 0 100 200 300 400 500 Air Flow (LFM) 25 C 40 C 55 C Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage). 0 5 10 15 20 25 30 35 40 0 2540 5570 85 Ambient Air Temperature (oC) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 LFM (0 m/s) Figure 5: Maximum output power derating curves vs. ambient air tem- perature for airflow rates of 0 LFM through 400 LFM with air flowing from output to input (nominal input voltage). Figure 6: Thermal plot of converter at 40 amp load current with 55°C air flowing at the rate of 200 LFM. Air is flowing across the converter from output to input (nominal input voltage). |
