전자부품 데이터시트 검색엔진 |
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VTM48EX480Y006A00 데이터시트(PDF) 14 Page - Vicor Corporation |
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VTM48EX480Y006A00 데이터시트(HTML) 14 Page - Vicor Corporation |
14 / 18 page VTM® Current Multiplier Rev 1.3 vicorpower.com Page 14 of 18 07/2015 800 927.9474 480 006A00 y E 48 VTM x VIN VOUT + – DC ZIN_EQ1 ZIN_EQ2 ZOUT_EQ1 ZOUT_EQ2 Load VTM®1 RO_1 VTM®2 RO_2 VTM®n RO_n ZOUT_EQn ZIN_EQn Figure 17 — VTM module array 14.0 CURRENT SHARING The SAC topology bases its performance on efficient transfer of energy through a transformer without the need of closed loop control. For this reason, the transfer characteristic can be approximated by an ideal transformer with some resistive drop and positive temperature coefficient. This type of characteristic is close to the impedance characteristic of a DC power distribution system, both in behavior (AC dynamic) and absolute value (DC dynamic). When connected in an array with the same K factor, the VTM module will inherently share the load current (typically 5%) with parallel units according to the equivalent impedance divider that the system implements from the power source to the point of load. Some general recommendations to achieve matched array impedances: • Dedicate common copper planes within the PCB to deliver and return the current to the modules. • Provide the PCB layout as symmetric as possible. • Apply same input / output filters (if present) to each unit. For further details see AN:016 Using BCM® Bus Converters in High Power Arrays. 15.0 FUSE SELECTION In order to provide flexibility in configuring power systems VI Chip® products are not internally fused. Input line fusing of VI Chip products is recommended at system level to provide thermal protection in case of catastrophic failure. The fuse shall be selected by closely matching system requirements with the following characteristics: • Current rating (usually greater than maximum current of VTM module) • Maximum voltage rating (usually greater than the maximum possible input voltage) • Ambient temperature • Nominal melting I2t 16.0 REVERSE OPERATION The VTM48EF480T006A00 is capable of reverse operation. If a voltage is present at the output which satisfies the condition VOUT > VIN • K at the time the VC voltage is applied, or after the unit has started, then energy will be transferred from secondary to primary. The input to output ratio will be maintained. The VTM48EF480T006A00 will continue to operate in reverse as long as the input and output are within the specified limits. The VTM48EF480T006A00 has not been qualified for continuous operation (>10 ms) in the reverse direction. |
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