EMC VI-J00, VI-200 RAM / MI-RAM Operation, Output noise, with Ripple Attenuator Module RAM

Page 11

9. EMC Considerations

Design Guide & Applications Manual

For VI-200 and VI-J00 Family DC-DC Converters and Configurable Power Supplies

RAM / MI-RAM OPERATION

The RAM/MI-RAM attenuates output noise in two ways. First, an LC filter in the RAM/MI-RAM attenuates high frequency components associated with the switching frequency. Secondly, the RAM/MI-RAM contains an active filter that attenuates low frequency components associated with the input to the converter. These frequencies are on the order of 60 – 120 Hz and harmonics would require very large output LC if a passive approach were to be used. Essentially, the active circuit looks at the output ripple from the converter, multiplies it by –1 (inverts) and adds it to the output. This effectively cancels out the low frequency components.

The RAM does not contain any common-mode filtering, so whatever common-mode noise is present is passed through. It only provides differential filtering of noise that is present on one output pin relative to the other.

The use of the RAM/MI-RAM is very straightforward, but a couple of precautions should be noted. The LC filter is in the positive output lead, so if that lead is shorted then the high frequency attenuation is compromised. The active circuit is in the negative output lead, so if that lead is shorted the low frequency attenuation is compromised. The RAM must be used with a common-mode choke at the input of the converter.

The RAM is intended to be used with the Vicor VI-200/ VI-J00, and the MI-RAM is intended to be used with Vicor MI-200/MI-J00 Family of DC-DC converter modules. It is also available in a chassis mounted version as VI-LRAM-xx (MegaMod package) or VI-RAM-xx-B1 (BusMod package).

NOTE: Do not use if load is inductive as instability may result. The addition of the RAM will increase the converter’s current limit setpoint by ~ 14%.

RAM Output Filter

Typical Vicor Module (VI-230-CV) 48 V Input, 5 V Output with VI-RAM-C2

 

 

C2a

 

C3a

 

 

 

 

 

 

 

L1

 

 

 

 

 

 

 

 

 

+

 

+IN

+OUT

 

 

+IN

+OUT

 

 

 

 

 

GATE

+S

 

 

+S IN

+S

 

 

 

 

C1

IN

TRIM

 

 

RAM

 

 

 

 

GATE

 

 

 

 

 

 

 

–S

 

 

–S IN

–S

 

 

 

 

 

OUT

C4

+

 

 

 

–

 

–OUT

–IN

–OUT

 

 

 

 

–IN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Conditions

 

 

C2b

 

C3b

 

 

C1 = 100 µF

 

Light Load = 3 A

 

 

 

 

 

C2a – C2b = 4,700 pF (Vicor Part # 01000)

Full Load = 15 A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C3a – C3b = 0.01 µF

(Vicor Part # 33643)

Overload Condition = 30 A

 

 

 

 

 

 

 

C4

= 220 µF

(Electrolytic)

 

 

 

 

 

Output Ripple vs. Load

 

 

 

 

 

3 Amp Load

 

 

15 Amp Load

 

 

30 Amp Load

 

 

 

 

 

 

(Overload Condition)

 

 

 

 

 

 

 

 

 

Figure 9–13— Output noise, with Ripple Attenuator Module (RAM)

vicorpower.com

800-735-6200

Applications Engineering 1-800-927-9474

Rev. 2.1

Page 28 of 88

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Contents Conducted Noise vs. Load Conducted NoiseTypical Vicor Module Input, 5 V Output VI-230-CV Typical Fixed Frequency Converter PWM Input, 5 V Output EMC ConsiderationsConducted input noise, with common-mode choke Typical Vicor Module VI-230-CV Input, 5 V OutputConducted noise, multiple zero-current-switching converters Conducted noise, differential-mode filtering Noise Considerations Radiated NoiseNoise coupling model Measuring Output NoiseOutput Ripple vs. Load Outputs 12 15 V Outputs 24 48 V Outputs11- Output noise, additional output capacitance 100 µF C2a C2b = 700 pF Vicor 13- Output noise, with Ripple Attenuator Module RAM RAM / MI-RAM Operation

VI-J00, VI-200 specifications

EMC VI-J00 and VI-200 are advanced storage solutions designed to meet the diverse needs of modern enterprises. As part of the EMC product line, these models offer features intended to enhance data management, security, and scalability, making them suitable for various applications, from small businesses to large-scale data centers.

The EMC VI-J00 is renowned for its compact design and energy efficiency. It is particularly well-suited for edge computing applications, where space is limited and power consumption is a critical concern. This model leverages cutting-edge data reduction technologies such as deduplication and compression, allowing organizations to maximize storage efficiency while minimizing costs. The VI-J00 also supports multiple access protocols including NAS and block, enabling seamless integration into existing IT environments.

In contrast, the EMC VI-200 offers a more robust and scalable solution for larger enterprises requiring extensive data throughput and storage capacity. It features high-performance storage capabilities with support for NVMe technology, which significantly enhances data access speeds. The VI-200 is built with a modular architecture, allowing organizations to scale their systems as needed, adding capacity or performance without disrupting ongoing operations.

Both models incorporate advanced data protection technologies, including snapshot capabilities and remote replication, ensuring that data is secure and recoverable in the event of a failure. Additionally, they support advanced analytics and management tools that provide real-time insights into storage performance and utilization, leading to improved resource allocation.

Interoperability is another key characteristic of both the VI-J00 and VI-200. These systems are designed to work seamlessly with a wide range of applications and platforms, providing flexibility and choice for IT administrators. Their compatibility with various virtualization platforms further enhances their appeal, allowing businesses to create dynamic, efficient storage environments.

In summary, EMC VI-J00 and VI-200 are powerful storage solutions tailored to meet the demands of today's data-centric organizations. With features focused on efficiency, scalability, and data protection, they stand out as reliable options for businesses looking to optimize their data storage strategies while leveraging the latest technologies.
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