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Input: Input: Output: Output: Current: Current: PPackage: ackage: 18-36 V 18-36 V 3.3 V 3.3 V 25 A 25 A (82.5W) (82.5W) Quarter-brick Quarter-brick T Technical S echnical Specification pecification Product # PQ24033QGA25 Phone 1-888-567-9596 Doc.# 005-2QG233D Rev. B 08/17/06 Page 5 60 65 70 75 80 85 90 95 0 3 5 8 10 13 15 18 20 23 25 Load Current (A) 18Vin 24Vin 36Vin 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 0 3 5 8 10 13 15 18 20 23 25 Load Current (A) 18Vin 24Vin 36Vin Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 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 25 025 40 55 70 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) 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 input to output (nominal input voltage). Figure 6: Thermal plot of converter at 20 amp load current with 55°C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (nominal input voltage). Semiconductor junction temperature is within 1°C of surface temperature |
