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VT048A040T050FP Datasheet(PDF) 7 Page - Vicor Corporation |
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VT048A040T050FP Datasheet(HTML) 7 Page - Vicor Corporation |
7 / 11 page Voltage Transformation Module VT048A040T050FP vicorpower.com Rev. 1.0 Page 7 of 11 APPLICATION NOTES & TEST CIRCUIT Parallel Operation In applications requiring higher current or redundancy, VTMs can be operated in parallel without adding control circuitry or signal lines. To maximize current sharing accuracy, it is imperative that the source and load impedance on each VTM in a parallel array be equal. If VTMs are being fed by an upstream PRM, the VC nodes of all VTMs must be con- nected to the PRM VC. To achieve matched impedances, dedicated power planes within the PC board should be used for the output and output return paths to the array of paralleled VTMs. This technique is preferable to using traces of varying size and length. The VTM power train and control architecture allow bi-directional power transfer when the VTM is operating within its specified ranges. Bi-direc- tional power processing improves transient response in the event of an output load dump. The VTM may operate in reverse, returning output power back to the input source. It does so efficiently. Input Impedance Recommendations To take full advantage of the VTM’s capabilities, the impedance of the source (input source plus the PC board impedance) must be low over a range from DC to 5 MHz. The input of the VTM (factorized bus) should be locally bypassed with a 8 µF low Q aluminum electrolytic capacitor. Additional input capacitance may be added to improve transient performance or compensate for high source impedance. The VTM has extremely wide bandwidth so the source response to transients is usually the limiting factor in overall output response of the VTM. Anomalies in the response of the source will appear at the output of the VTM, multiplied by its K factor of 1/12. The DC resistance of the source should be kept as low as possible to minimize voltage deviations on the input to the VTM. If the VTM is going to be operating close to the high limit of its input range, make sure input voltage deviations will not trig- ger the input overvoltage turn-off threshold. Input Fuse Recommendations VI BRICKs are not internally fused in order to provide flexibility in config- uring power systems. However, input line fusing of VI BRICKs must always be incorporated within the power system. A fast acting fuse is required to meet safety agency Conditions of Acceptability. The input line fuse should be placed in series with the +In port. For agency approvals and fusing conditions, click on the link below: http://www.vicorpower.com/technical_library/technical_documentation/quality_ and_certification/safety_approvals/ Application Notes For VTM and VI BRICK application notes on soldering, board layout, and system design please click on the link below: http://www.vicorpower.com/technical_library/application_information/ Applications Assistance Please contact Vicor Applications Engineering for assistance, 1-800-927-9474, or email at apps@vicorpower.com. F1 Load + – Input reflected ripple measurement point C2 0.47 μF ceramic + – 14 V VTM +IN +OUT -OUT +OUT -OUT -IN TM VC PC Figure 10 — VI BRICK VTM test circuit Notes: 1. C3 should be placed close to the load 2. R3 may be ESR of C3 or a separate damping resistor. [a] See Input Fuse Recommendations section C3 47 µF R3 10 m Ω C1 47 µF Al electrolytic 6A[a] Fuse |
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