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S28A3V3T150BS3 Datasheet(PDF) 9 Page - Vicor Corporation |
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S28A3V3T150BS3 Datasheet(HTML) 9 Page - Vicor Corporation |
9 / 12 page 28 V Wide Maxi Family Rev 2.8 vicorpower.com Page 9 of 12 02/2016 800 927.9474 28 V Input Parallel Operation The PR pin supports paralleling for increased power with N+1 (N+M) redundancy. Modules of the same input voltage, output voltage, and power level will current share if all PR pins are suitably interfaced. Compatible interface architectures include the following: AC coupled single-wire interface. All PR pins are connected to a single communication bus through 0.001 µF (500 V) capacitors. This interface supports current sharing and is fault tolerant except for the communication bus. Up to three converters may be paralleled by this method. See Figure 9. Transformer coupled interface. For paralleling four or more converters a transformer coupled interface is required. See Figure 10. For details on parallel operation please refer to the Design Guide & Applications Manual for Maxi, Mini, Micro Family. Figure 9 — AC coupled single-wire interface. * See Maxi, Mini, Micro Design Guide. +IN PC PR –IN +IN PC PR –IN Module 2 Module 1 + Parallel Bus – 0.2 μF 0.001 μF 0.2 μF 0.001 μF Low inductance ground plane or bus 4.7 nF 4.7 nF 4.7 nF 4.7 nF Z1 * Z1 * +IN PC PR –IN +IN PC PR –IN Module 2 Module 1 T1 T2 + – 0.2 μF 0.2 μF Parallel Bus 4.7 nF 4.7 nF 4.7 nF 4.7 nF Z1 * Z1 * Figure 10 — Transformer-coupled interface. PARALLEL BUS - PR PIN Output Voltage Programming The output voltage of the converter can be adjusted or programmed via fixed resistors, potentiometers or voltage DACs. See Figure 8. Figure 8 — Output voltage trim down and trim up circuit. –OUT +S SC Error Amplifier 0.033 uF – + -S +OUT Load Rd Trim Down Ru Trim Up 1.23 V 1 kΩ 100 Ω typ. 1,000 Vout Vnom – Vout Rd (ohms) = 1,000 (Vout –1.23) Vnom 1.23 (Vout – Vnom) RU (ohms) = – 1,000 Trim Down 1. This converter is not a constant power device – it has a constant current limit. Hence, available output power is reduced by the same percentage that output voltage is trimmed down. Do not exceed maximum rated output current. 2. The trim down resistor must be connected between the SC and -S pins. Do not bypass the SC pin directly with a capacitor. Trim Up 1. The converter is rated for a maximum delivered power. To ensure that maximum rated power is not exceeded, reduce maximum output current by the same percentage increase in output voltage. 2. The trim up resistor must be connected between the SC and +S pins. Do not bypass the SC pin directly with a capacitor. 3. Do not trim the converter above maximum trim range (typically +10%) or the output over voltage protection circuitry may be activated. SECONDARY CONTROL - SC PIN Trim resistor values calculated automatically: On-line calculators for trim resistor values are available on the vicor website at: asp.vicorpower.com/calculators/calculators.asp?calc=1 Resistor values can be calculated for fixed trim up, fixed trim down and for variable trim up or down. |
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