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V048F030T070 Datasheet(PDF) 8 Page - Vicor Corporation |
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V048F030T070 Datasheet(HTML) 8 Page - Vicor Corporation |
8 / 14 page PRM® Regulator Rev 3.2 vicorpower.com Page 8 of 14 07/2015 800 927.9474 P024F048T12AL Pin / Control Functions Figure 15 — PRM pin configuration Bottom View +OUT –OUT +IN –IN VC PC TM IL VH PR NC SG SC OS NC CD AL Version A A B B C C D D E E G G F F H H J J K K L L M M N N P P 1 2 3 4 Signal Name Designation +In G1-K1,G2-K2 –In L1-P1, L2-P2 VC A1,A2 PC B1, B2 TM C1, C2 IL D1, D2 PR F1, F2 VH A3, A4 SC B3, B4 SG C3, C4 OS D3, D4 CD F3, F4 +Out G3-K3, G4-K4 –Out L3-P3, L4-P4 +In / -In DC Voltage Ports The VI Chip maximum input voltage should not be exceeded. PRMs have internal over / undervoltage lockout functions that prevent operation outside of the specified input range. PRMs will turn on when the input voltage rises above its undervoltage lockout. If the input voltage exceeds the overvoltage lockout, PRMs will shut down until the overvoltage fault clears. PC will toggle indicating an out of bounds condition. +Out / -Out Factorized Voltage Output Ports These ports provide the Factorized Bus voltage output. The –Out port is connected internally to the –In port through a current sense resistor. The PRM has a maximum power and a maximum current rating and is protected if either rating is exceeded. Do not short –Out to –In. VC – VTM Control The VTM Control (VC) port supplies an initial VCC voltage to downstream VTMs, enabling the VTMs and synchronizing the rise of the VTM output voltage to that of the PRM. The VC port also provides feedback to the PRM to compensate for voltage drop due to the VTM output resistance. The PRM’s VC port should be connected to the VTM VC port. A PRM VC port can drive a maximum of two (2) VTM VC ports. PC – Primary Control The PRM voltage output is enabled when the PC pin is open circuit (floating). To disable the PRM output voltage, the PC pin is pulled low. Open collector optocouplers, transistors, or relays can be used to control the PC pin. When using multiple PRMs in a high power array, the PC ports must be tied together to synchronize their turn on. During an abnormal condition the PC pin will pulse (Fig.12) as the PRM initiates a restart cycle. This will continue until the abnormal condition is rectified. The PC should not be used as an auxiliary voltage supply, nor should it be switched at a rate greater than 1 Hz. TM – Factory Use Only IL – Current Limit Adjust The PRM has a preset, maximum, current limit set point. The IL port may be used to reduce the current limit set point to a lower value. See “Adjusting Current Limits” on page 10. PR – Parallel Port The PR port signal, which is proportional to the PRM output power, supports current sharing of two PRMs. To enable current sharing, PR ports should be interconnected. Steps should be taken to minimize coupling noise into the interconnecting bus. Terminate this port with a 10 k equivalent resistance to SG, e.g. 10 k for a single PRM, 20 k each for 2 PRMs in parallel, 30 k each for 3 PRMs in parallel etc.. Please consult Vicor Applications Engineering regarding additional considerations when paralleling more than two PRMs. VH – Auxiliary Voltage VH is a gated (e.g. mirrors PC), non-isolated, nominally 9 Volt, regulated DC voltage (see “Auxiliary Pins” specifications, on Page 7) that is referenced to SG. VH may be used to power external circuitry having a total current consumption of no more than 5 mA under either transient or steady state conditons including turn-on. SC – Secondary Control The load voltage may be controlled by connecting a resistor or voltage source to the SC port referenced to SG. The slew rate of the output voltage may be controlled by controlling the rate-of-rise of the voltage at the SC port (e.g., to limit inrush current into a capacitive load). SG – Signal Ground This port provides a low inductance Kelvin connection to –In and should be used as reference for the OS, CD, SC,VH and IL ports. OS – Output Set The application-specific value of the Factorized Bus voltage (Vf) is set by connecting a resistor between OS and SG. Resistor value selection is shown in Table 1 on Page 2, and described on Page 9. If no resistor is connected, the PRM output will be approximately one volt. If set resistor is not collocated with the PRM, a local bypass capacitor of ~200 pF may be required. CD – Compensation Device Adaptive Loop control is configured by connecting an external resistor between the CD port and SG. Selection of an appropriate resistor value (see Equation 2 on Page 9 and Table 1 on Page 2) configures the PRM to compensate for voltage drops in the equivalent output resistance of the VTM and the PRM-VTM distribution bus. If no resistor is connected to CD, the PRM will be in Local Loop mode and will regulate the +Out / –Out voltage to a fixed value. |
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