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V048F020T080 Datasheet(PDF) 10 Page - Vicor Corporation |
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V048F020T080 Datasheet(HTML) 10 Page - Vicor Corporation |
10 / 14 page PRM® Regulator Rev 3.2 vicorpower.com Page 10 of 14 07/2015 800 927.9474 P024F048T12AL Application Information (continued) OVP – Overvoltage Protection The output Overvoltage Protection set point of the P024F048T12AL is factory preset for 56 V. If this threshold is exceeded the output shuts down and a restart sequence is initiated. If the condition that causes OVP is still present, the unit will again shut down. This cycle will be repeated until the fault condition is removed. The OVP set point may be set at the factory to meet unique high voltage requirements. PRM Output Power Versus VTM Output Power As shown in Figure 17 the P024F048T12AL is rated to deliver 2.5 A maximum, when it is delivering an output voltage in the range from 26 V to 48 V, and 120 W, maximum, when delivering an output voltage in the range from 48 V to 55 V. When configuring a PRM for use with a specific VTM, refer to the appropriate VTM data sheet. The VTM input power can be calculated by dividing the VTM output power by the VTM efficiency (available from the VTM data sheet). The input power required by the VTM should not exceed the output power rating of the PRM. The Factorized Bus voltage should not exceed an absolute limit of 55 V, including steady state, ripple and transient conditions. Exceeding this limit may cause the internal OVP set point to be exceeded. Parallel Considerations The PR port is used to connect two PRMs in parallel to form a higher power array. When configuring arrays, PR port interconnection terminating impedance is 10 k to SG. See note Page 8 and refer to Application Note AN002. Additionally one PRM should be designated as the master while all other PRMs are set as slaves by shorting their SC pin to SG. The PC pins must be directly connected (no diodes) to assure a uniform start up sequence. Consult Vicor applications engineering for applications requiring more than two PRMs. Adjusting Current Limit The current limit can be lowered by placing an external resistor between the IL and SG ports (see Figure 18 for resistor values). With the IL port open-circuit, the current limit is preset to be within the range specified in the output specifications table on Page 4. Input Fuse Recommendations A fuse should be incorporated at the input to the PRM, in series with the +In port. A fast acting fuse, NANO2 FUSE 451/453 Series 10 A 125 V, or equivalent, may be required to meet certain safety agency Conditions of Acceptability. Always ascertain and observe the safety, regulatory, or other agency specifications that apply to your specific application. Product Safety Considerations If the input of the PRM is connected to SELV or ELV circuits, the output of the PRM can be considered SELV or ELV respectively. Application Notes For PRM and VI Chip application notes on soldering, board layout, and system design please click on the link below: http://www.vicorpower.com/powerbench/applicationnotes Applications Assistance Please contact Vicor Applications Engineering for assistance, 1-800-927-9474, or email at apps@vicorpower.com. 1.00 10.00 100.00 0.5 1 1.5 2 2.5 Desired PRM Output Current Limit (A) Figure 18 — External resistor value for adjusting current limit 26 30 34 38 42 46 50 54 Factorized Bus Voltage (Vf) 2.30 2.35 2.40 2.45 2.50 2.55 28 32 36 40 44 48 52 2.25 2.20 2.15 60 20 ~~ 0 22 24 56 58 Safe Operating Area Figure 17 — P024F048T12AL rating based on Factorized Bus voltage |
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