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V048K060T040 Datasheet(PDF) 10 Page - Vicor Corporation |
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V048K060T040 Datasheet(HTML) 10 Page - Vicor Corporation |
10 / 15 page vicorpower.com 800-735-6200 V•I Chip Pre-Regulator Module P048K048T24AL Rev. 1.4 Page 10 of 15 PRELIMINARY Application Information (continued) V•I Chip Pre-Regulator Module OVP – Overvoltage Protection The output Overvoltage Protection set point of the P048K048T24AL is factory preset for 58 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 15, the P048K048T24AL is rated to deliver 5 A maximum, when it is delivering an output voltage in the range from 26 V to 48 V, and 240 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 or more PRMs in parallel to form a higher power array. When configuring arrays, PR port interconnection bypass capacitance must be used at ~1nF per PRM. 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. The factorized bus should be connected in parallel as well. Adjusting current limit The current limit can be lowered by placing an external resistor between the IL and SG ports (see figure 16 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. If the input of the PRM is connected to a centralized DC power system where the working or float voltage is above SELV, but less than or equal to 75 V, the input and output voltage of the PRM should be classified as a TNV-2 circuit and spaced 1.3 mm from SELV circuitry or accessible conductive parts according to the requirements of UL60950, CSA 22.2 60950, EN60950, and IEC60950. Applications assistance Please contact Vicor Applications Engineering for assistance, 1-800-927-9474, or email at apps@vicr.com. 1.00 10.00 100.00 12 345 Desired PRM Output Current Limit (A) Figure 16 — External resistor value for adjusting current limit 26 30 34 38 42 46 50 54 Factorized Bus Voltage (Vf) 4.6 4.7 4.8 4.9 5.0 5.1 28 32 36 40 44 48 52 4.5 4.4 4.3 60 20 ~ ~ 0 22 24 56 58 Safe Operating Area Figure 15 — P048K048T24AL rating based on Factorized Bus voltage |
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