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DIM3R3300SFA Datasheet(PDF) 9 Page - Delta Electronics, Inc. |
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DIM3R3300SFA Datasheet(HTML) 9 Page - Delta Electronics, Inc. |
9 / 13 page PRELIMINARY DATASHEET DS_DIM3R3_03252009 9 FEATURES AND DESIGN CONSIDERATIONS Introduction The DIM3R3/050 module is designed to simplify the task and reduce the board space of an ATCA (Advanced Telecommunications Computing Architecture) power entry distribution requirements in the system board. The main functionality of the module is to provide dual, redundant -48V A/B Feed OR’ing, inrush protection for hot swap capability, EMI filtering to attenuate the noise generated by the downstream DC/DC converters, and a 72V output voltage for charging the holdup capacitor. The module also has a management power supply which provides an 8W, 3.3V or 5V management power and/or a 5V/100mA output (optional) to power the blue LED per PICMG 3.0 requirement. The module provides A/B feed/fuse open alarm, over current protection, over voltage protection, and over temperature protection. It also provides input under voltage lock-out and input reverse polarity protection. A/B Feed OR’ing To improve the total power distribution efficiency, four internal MOSFETs are used to function as the OR’ing diodes. A control circuit is designed to keep about 100mV voltage drop across MOSFET. During full load operation, the MOSFETs are fully turned on. During light load, the MOSFETs work under a high Rdson condition. If the output current decreases to zero, the MOSFETs will be turned off. This design provides module a reverse voltage sustain function. The module shall not be damaged from reverse polarity connection in the event of mis-wiring of either input feeds at the shelf input terminals. Furthermore, a fast shut down circuit is designed for the negative current case. This design protects the common DC bus against hard short faults at the sourcing power supply output. Hot Swap Functionality The hot-swap function is designed to limit the inrush current charged to the bulk capacitor of the down stream bus converter. The current value and duration comply with the PICMG 3.0’s Inrush Transient specs. Although the inrush current for bulk capacitor is under control, special attentions need to be paid to the current for EMI filter because this circuit is in front of hot-swap circuit. EMI Filtering An internal EMI filter is designed for the ATCA board to meet the system conducted emission requirements of CISPR 22 Class B when used with Delta DC/DC converters. Figure 17 shows the EMI performance of DIM3R3 when it worked with Delta power module Q48SH12025NRFA (36~75Vin, 12V/25A output Quarter brick). It meets CISPR 22 Class B requirement. Figure 11: EMI test result with Q48SH12025NRFA: Holdup Capacitor Charging Current (72V_CAP) An off line holdup capacitor (C_HLDP) is needed to store energy for the holdup time requirement. C_HLDP is charged to 72V (+/- 3% tolerance). For a fixed energy storage requirement, high capacitor voltage reduces capacitor capacitance and size. A constant current circuit charges C_HLDP before its voltage reaches the high limitation and isolates it from power train circuit. The discharge switch will turn on if both A&B feeds have dropped below –38V (typical). C_HLDP will be connected to power train and provided the energy for system operation. C_HLDP is calculated by the following equation: 2 2 72 _ * * 2 _ Vth V HLDP T Power HLDP C − = Where Power is the input power to the downstream DC/DC converter; T_HLDP is the holdup time requirement; Vth is the minimum input voltage threshold of the downstream DC/DC converter. |
Similar Part No. - DIM3R3300SFA_09 |
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Similar Description - DIM3R3300SFA_09 |
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