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PI3546-00-LGIZ Datasheet(PDF) 26 Page - Vicor Corporation |
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PI3546-00-LGIZ Datasheet(HTML) 26 Page - Vicor Corporation |
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26 / 37 page  Cool-Power® Rev 1.3 vicorpower.com Page 26 of 37 2/2016 800 927.9474 PI354x-00 Soft-Start Adjust and Tracking The TRK pin offers a means to increase the regulator’s soft- start time or to track with additional regulators. The soft- start slope is controlled by an internal capacitor and a fixed charge current to provide a Soft-Start Time tSS for all PI354x-00 regulators. By adding an additional external capacitor to the TRK pin, the soft-start time can be increased further. The following equation can be used to calculate the proper capacitor for a desired soft-start times: CTRK = (tTRK • ITRK ) – 47 • 10-9, Where, tTRK is the soft-start time and ITRK is a 50 μA internal charge current (see Electrical Characteristics for limits). There is typically either proportional or direct tracking implemented within a design. For proportional tracking between several regulators at startup, simply connect all PI354x-00 device TRK pins together. This type of tracking will force all connected regulators to startup and reach regulation at the same time (see Figure 52a). For Direct Tracking, choose the PI354x-00 with the highest output voltage as the master and connect the master to the TRK pin of the other PI354x-00 regulators through a divider (Figure 53) with the same ratio as the slave’s feedback divider. All connected PI354x-00 regulator soft-start slopes will track with this method. Direct tracking timing is demonstrated in Figure 52b. All tracking regulators should have their Enable (EN) pins connected together to work properly. Inductor Pairing The PI354x-00 utilizes an external inductor. This inductor has been optimized for maximum efficiency performance. Table 2 details the specific inductor value and part number utilized for each PI354x-00. Thermal De-rating Thermal de-rating curves are provided that are based on component temperature changes versus load current, input voltage and air flow. It is recommended to use these curves as a guideline for proper thermal de-rating. These curves represent the entire system and are inclusive to both the Picor regulator and the external inductor. Maximum thermal operation is limited by either the MOSFETs or inductor depending upon line and load conditions. Thermal measurements were made using a standard PI354x-00 Evaluation board which is 2.5 x 4 inches in area and uses 4-layer, 2oz copper. Thermal measurements were made on the three main power devices, the two internal MOSFETs and the external inductor, with air flows of 0, 200, and 400 LFM. Small Signal Model - Constant Voltage Mode The PI354X product family is a variable frequency CCM/DCM ZVS Buck Regulator. The small signal model for this powertrain is that of a voltage controlled current source which has a trans-conductance that varies depending on the operating mode. When the converter is operating at its normal frequency, it is in discontinuous mode. As the load increases to the point at which the boundary between Figure 52 — PI354x-00 tracking methods (b) (a) 2 OUT V OUT Master V 2 OUT V 1 OUT V t Figure 53 — Voltage divider connections for direct tracking OUT Master V R1 R2 TRK SGND x PI3 Slave Table 2 — PI354x-00 Inductor pairing Device Inductor (nH) Inductor Part Number Manufacturer PI3542-00 340 FPT1006-340-R Eaton PI3543-00 420 HCV1206-R42-R Eaton PI3545-00 420 HCV1206-R42-R Eaton PI3546-00 900 HCV1206-R90-R Eaton V OUT = Vref • (1) (R1 + R2) R2 R1 = –R2 • (2) (Vref – V OUT) Vref where, Vref = 1 V |
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