Ripple Attenuator Modules VI-RAM/VE-RAM Ripple Attenuator Modules VI-RAM Specifications Features & Benefits Parameter Min. Typ. Max. Remarks RoHS compliant (VE versions) Output Noise & Ripple VI-200 3mVp-p From 10% of full rated Reduces output ripple to <3mVp-p VI-J00 10mVp-p output current of the Compatible with any VI-200/VI-J00 source converter to full load Input Voltage Range 5V 50V based product: 5 to 50V output DC DC DC Output Voltage Deviation 0.5% From the output voltage Full attenuation up to 20A of the VI-200 source to which the VI-RAM will be No adjustments required connected Full Load Current 10A E1, C1, I1 or M1 93 99% efficiency 20A E2, C2, I2 or M2 Overload Current 30A At max. operating baseplate Converter sense, trim, overvoltage temperature and overcurrent retained DC Voltage Drop 0.34V 0.41V Up to 10A DC DC 0.34V 0.44V Up to 20A DC DC Size: 2.28 x 2.4 x 0.5 0.34V 0.75V Up to 30A (overload) DC DC (57,9 x 61,0 x 12,7 mm) Dissipation = (DC voltage drop) x (Load current + 15mA) Isolation 500V Input/Output to baseplate RMS CE Mark Size 2.28 x 2.4 x 0.5 SlimMod and FinMod (57,9 x 61,0 x 12,7) packages available Weight Product Highlights E,C-Grade 3.0(85) Ounces(Grams) I,M-Grade 3.6(102) 3.7(105) 3.8(107) Ripple attenuator modules may be connected to VI-200 or VI-J00 converters, FlatPACs, Electrical Considerations ComPACs or MegaModules, with output voltages from 5 50V, to limit output noise Transient Response and Dynamic Range: Full rated noise attenuation will be to less than 3mV peak-to-peak at loads maintained at the VI-RAM output for step load changes up to 10% of the rated up to 20A. Combining active and passive output current of the source converter, with the VI-RAM exhibiting an underdamped lfi tering, the VI-RAM attenuates both low output excursion of less than 10mVp-p. Some degradation in noise attenuation during frequency input power source fundamental the transient response period following the step may be exhibited for larger load and harmonics, as well as high frequency changes. Adding output capacitance to the VI-RAM will improve the rejection over a switching components in the frequency larger dynamic range. range of DC to 20MHz, while exhibiting Sense Connection: Sense -IN and Sense -OUT connections are provided on the VI-RAM. efficiencies of 93-99%. No adjustments Sense -IN connections must be connected to the corresponding sense connections on the are required, and remote sense and output Vicor converter. Sense -OUT pins on the VI-RAM must be connected between the voltage trim features are retained. VI-RAM power-output pins and the point of load. A member of Vicors high-power density, Output Load Characteristics: When used in combination with Vicor DC-DC converters, high performance, component-level and with sense leads connected, the VI-RAM will be stable for any non-inductive load. power building blocks, the VI-RAM offers the power systems architect a single, DC Voltage Drop: Below full load, the input to output DC Voltage Drop is controlled to flexible, component-level solution to almost be an essentially constant voltage which appears between the IN and OUT terminals. any clean power problem. At the same In overload the DC voltage drop will rise as current increases. A few tens of millivolts time, the VI-RAM eliminates the space, appears between the +IN and +OUT terminals. Care should be taken not to connect IN efcfi iency, and weight penalties associated and OUT terminals (i.e. through scope probe returns, grounds, etc.), as attenuation will be with linear power sources, and the stability, adversely affected. efficiency, and adjustment penalties Product Grade Specifications associated with external add on filters for conventional switchers. Parameter (Up to 10A) VI-RAM-E1 VI-RAM-C1 VI-RAM-I1 VI-RAM-M1 (Up to 20A) VI-RAM-E2 VI-RAM-C2 VI-RAM-I2 VI-RAM-M2 Storage Temp. -20C to +105C -40C to +105C -55C to +105C -65C to +105C Operating Temp. -10C to +100 -25C to +100C -40C to +100C -55C to +100C (Baseplate) VI-RAM/VE-RAM Rev 1.8 vicorpower.com Page 1 of 4 06/2017 800 927.9474VI-RAM/VE-RAM Comparison of Input to Output Ripple (Typical) Attenuation vs. Frequency (Typical) 25db 30db 35db 40db Input to the converter 10V/cm 45db 50db 55db 60db 10Hz 100Hz 1KHz 10KHz 100KHz 1MHz 10MHz Frequency Output from the RAM 20mV/cm Recommended Connection Diagram .01F .01F L1 + + IN +OUT + IN +OUT 0.22F + S IN + S OUT + S Gate IN VI-200 Trim C1 N/C VI-RAM Load Gate OUT S S IN S OUT + 220F In OUT OUT IN .01F .01F For important application information please refer to the Design Guide and Applications Manual for VI-200 and VI-J00 Family. VI-RAM/VE-RAM Rev 1.8 vicorpower.com Page 2 of 4 06/2017 800 927.9474 Attenuation