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PI3546-00-LGIZ Datasheet(PDF) 33 Page - Vicor Corporation |
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PI3546-00-LGIZ Datasheet(HTML) 33 Page - Vicor Corporation |
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33 / 37 page  Cool-Power® Rev 1.3 vicorpower.com Page 33 of 37 02/2016 800 927.9474 PI354x-00 Device VIN (V) ILOAD (A) CINPUT Ceramic X5R COUTPUT Ceramic X5R CINPUT Ripple Current (IRMS) COUTPUT Ripple Current (IRMS) Input Ripple (mVpp) Output Ripple (mVpp) Transient Deviation (mVpk) Recovery Time (µs) Load Step (A) (Slew/µs) PI3542 48 10 5 x 2.2 µF 100 V 6 x 100 µF 0.7 1.32 416 47 -/+80 40 5 (1 A/µs) 5 220 22 PI3543 48 10 5 x 2.2 µF 100 V 6 x 100 µF 0.8 1.3 464 61.6 -/+90 40 5 (1 A/µs) 5 230 31 PI3545 48 10 5 x 2.2 µF 100 V 6 x 47 µF .88 1.37 485 62 -/+150 40 5 (1 A/µs) 5 245 32 PI3546 48 9 5 x 2.2 µF 100 V 6 x 10 µF 1.12 1.26 880 114 -/+300 20 5 (1 A/µs) 4.5 125 33 Table 3 — Recommended input and output capacitance Table 4 — Capacitor manufacturer part numbers Murata Part Number Description C3225X7S1H1106M250AB 2.2 µF 100 V 1210 X7R C3225X7S1H106M250AB 10 µF 50 V 1210 X7R GRM31CR60J107ME39L 100 µF 6.3 V 1206 X7R GRM31CR61A476ME15L 47 µF 10 V 1206 X5R GRM32ER61H106MA12 10 µF 50 V 1210 X7R Layout Guidelines To optimize maximum efficiency and low noise performance from a PI354x-00 design, layout considerations are necessary. Reducing trace resistance and minimizing high current loop returns along with proper component placement will contribute to optimized performance. A typical buck converter circuit is shown in Figure 68. The potential areas of high parasitic inductance and resistance are the circuit return paths, shown as LR below. The path between the COUT and CIN capacitors is of particular importance since the AC currents are flowing through both of them when Q1 is turned on. Figure 69, schematically, shows the reduced trace length between input and output capacitors. The shorter path lessens the effects that copper trace parasitics can have on the PI354x-00 performance. When Q1 is on and Q2 is off, the majority of CIN’s current is used to satisfy the output load and to recharge the COUT capacitors. When Q1 is off and Q2 is on, the load current is supplied by the inductor and the COUT capacitor as shown in Figure 70. During this period CIN is also being recharged by the VIN. Minimizing CIN loop inductance is important to reduce peak voltage excursions when Q1 turns off. Also, the difference in area between the CIN loop and COUT loop is vital to minimize switching and GND noise. IN C IN V IN V OUT C Figure 68 — Typical Buck Regulator OUT C NV OUT C NV I NV C Figure 69 — Current flow: Q1 closed OUT C NV C OUT C NV I NV C Figure 70 — Current flow: Q2 closed |
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