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URAM2CN1 Datasheet(PDF) 3 Page - Vicor Corporation |
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URAM2CN1 Datasheet(HTML) 3 Page - Vicor Corporation |
3 / 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 3 of 8 Electrical Characteristics (continued) APPLICATION SCHEMATIC DRAWINGS USING VICOR CONVERTERS AND THE µRAM DC-DC Converter µRAM +Out VREF –Out +In SC CTRAN –In +Out +S SC –S –Out +In PC PR –In (2) RSENSE 5.1 22 µF CTRAN* *Optional Component RHR CHR* Figure 1—Typical Configuration using Remote Sensing DC-DC Converter +Out SC –Out +In PC PR –In µRAM +Out VREF –Out +In SC CTRAN –In RSC RHR CTRAN* CHR* *Optional Component Figure 2—Typical Configuration using SC Control (Oppional CHR 25µF maximum in SC configuration.) Functional Description The MicroRAM has an internal passive filter that effectively attenuates ripple in the 50kHz to 1MHz range. An active filter provides attenuation from low frequency up to the 1MHz range. The user must set the headroom voltage of the active block with the external RHR resistor to optimize performance. The MicroRAM must be connected as shown in Figures 1 or 2 depending on the load sensing method. The transient load current performance can be increased by the addition of optional CTRAN capacitance to the CTRAN pin. The low frequency ripple attenuation can be increased by addition of optional CHR capacitance to the VREF pin as shown in Figures 3a and 3b, on p. 5. Transient load current is supplied by the internal CTRAN capacitance, plus optional external capacitance, during the time it takes the converter loop to respond to the increase in load. The MicroRAM’s active loop responds in roughly one microsecond to output voltage perturbations. There are limitations to the magnitude and the rate of change of the transient current that the MicroRAM can sustain while the converter responds. See Figures 8-16, on pp. 6 and 7, for examples of dynamic performance. A larger headroom voltage setting will provide increased transient performance, ripple attenuation and power dissipation while reducing overall efficiency (see Figures 4a, 4b, 4c and 4d on p. 5). |
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