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URAM2C21 Datasheet(PDF) 5 Page - Vicor Corporation |
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URAM2C21 Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 8 page Set your site on VICOR at www.vicorpower.com PRELIMINARY Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 MicroRAM Rev. 1.1 Page 5 of 8 µRAM2xxx Ripple Attenuation @ 28V (Room Temp.) -80.00 -60.00 -40.00 -20.00 0.00 20.00 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Freq. (Hz) 10A, 100uF Vref 10A, No Vref Cap Ripple Attenuation @ 5V (Room Temp.) -80.00 -60.00 -40.00 -20.00 0.00 20.00 10 100 1,000 10,000 100,000 1,000,000 10,000,000 Freq. (Hz) 10A, 100uF Vref 10A, No Vref Cap Figure 3a, 3b—Curves demonstrating the small signal attenuation performance as measured on a network analyzer with a typical module at (a) 28V and 10A output and (b) 5V and 10A. The low frequency attenuation can be enhanced by connecting a 100µF capacitor, CHR, to the VREF pin as shown in Figures 1 and 2. Figure 4a-4b—Simulated graphs demonstrating the tradeoff of attenuation versus headroom setting at 20 Amps and an equivalent 100°C baseplate temperature at 3V and 28V. Figure 4c-4d—MicroRam attenuation vs. power dissipation at 3V 20A, and 28V 20A. Frequency 10Hz 100Hz 1.0KHz 10KHz 100KHz 1.0MHz ... DB(V(VOUT)) -75 -50 -25 -0 Vout=3V Iload=20A 100 degrees baseplate temperature Rhr=28k (Vheadroom=90mV) 27k (100mV) 22k (160mV) 23k (150mV) 24k (135mV) 25k (122mV) 26k (110mV) 17k (260mV) 18k (240mV) 19k (217mV) 20k (197mV) 21k (180mV) Frequency 10Hz 100Hz 1.0KHz 10KHz 100KHz 1.0MHz ... DB(V(VOUT)) -75 -50 -25 -0 Rhr=260k (Vheadroom=90mV) 250k (100mV) 240k (110mV) 230k (122mV) 220k (135mV) 210k (150mV) 200k (160mV) 190k (180mV) 180k (197mV) 170k (217mV) 160k (240mV) 150k (260mV) Vout=28V Iload=20A 100 degrees baseplate temperature 17k 18k 19k 20k 21k 22k 23k 24k 25k 26k 27k Rhr=28k -70 -60 -50 -40 -30 -20 -10 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Watts 500khz 3V 1Mhz 3V 100khz 3V 28V 20A Rhr=260k 250k 240k 230k 220k 210k 200k 190k 180k 170k 160k 150k -70 -60 -50 -40 -30 -20 -10 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Watts 100khz 28V 500khz 28V 1Mhz 28V Notes:The measurements in Figures 8-16 were taken with a µRAM2C21 and standard scope probes with a 20MHz bandwidth scope setting. The criteria for transient current capability was as follows: The transient load current step was incremented from 10A to the peak value indicated, then stepped back to 10A until the resulting output peak to peak was around 40mV. |
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