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I048C096T048P1 데이터시트(PDF) 5 Page - Vicor Corporation |
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I048C096T048P1 데이터시트(HTML) 5 Page - Vicor Corporation |
5 / 8 page Vicor Corporation Tel: 800-735-6200 vicorpower.com Quarter-Brick Intermediate Bus Converters Rev. 1.3 Page 5 of 8 PRELIMINARY +IN / –IN — DC Voltage Input Pins The "VIC-in-a-Brick" Intermediate Bus Converter (IBC) input voltage range should not be exceeded. The V•I Chip BCM’s internal under/over voltage lockout-function prevents operation outside of the normal input range. The BCM turns ON within an input voltage window bounded by the "Input under-voltage turn-on" and "Input over-voltage turn-off" levels, as specified. The IBC may be protected against accidental application of a reverse input voltage by the addition of a rectifier in series with the positive input, or a reverse rectifier in shunt with the positive input located on the load side of the input fuse. Input impedance Vicor recommends a minimum of 10 µF bypass capacitance be used on-board across the +IN and –IN pins. The type of capacitor used should have a low Q with some inherent ESR such as an electrolytic capacitor. If ceramic capacitance is required for space or MTBF purposes, it should be damped with approximately 0.3 Ω series resistance. Anomalies in the response of the source will appear at the output of the IBC multiplied by its K factor. The DC resistance of the source should be kept as low as possible to minimize voltage deviations. This is especially important if the IBC is operated near low or high line as the over/under voltage detection circuitry of the BCM(s) could be activated. PC — Primary Control Pin The Primary Control pin is a multifunction node that provides the following functions: Enable/Disable Standard "P" configuration — If the PC pin is left floating, the BCM output is enabled. Once this port is pulled lower than 2.4 Vdc with respect to –IN, the output is disabled. This action can be realized by employing a relay, opto-coupler or open collector transistor. This port should not be toggled at a rate higher than 1 Hz. Optional "M" configuration — This is the reverse function as above: when the PC pin is left floating , the BCM output is disabled. Primary Auxiliary Supply — The PC pin can source up to 2.4 mA at 5.0 Vdc. (P version only) Alarm — The BCM contains watchdog circuitry that monitors output overload, input over voltage or under voltage, and internal junction temperatures. In response to an abnormal condition in any of the monitored parameters, the PC pin will toggle. (P version only) +OUT / – OUT — DC Voltage Output Pins The 0.062" diameter + and – output pins are rated for a maximum current of 50 A. Two sets of pins are provided for all units with a current rating over 50 A. These pins must be connected in parallel with minimal interconnect resistance. Within the specified operating range, the average output voltage is defined by the Level 1 DC behavioral model of the on board BCM(s) as defined in the appropriate BCM data sheet. Output impedance The very low output impedance of the IBC, as shown in the Product Matrix table, reduces or eliminates the need for limited life aluminum electrolytic or tantalum capacitors at the input of the non-isolated point-of-load converters. Load capacitance Total load capacitance at the output of the IBC should not exceed the specified maximum as shown in the Product Matrix table. Owing to the wide bandwidth and low output impedance of the BCM, low frequency bypass capacitance and significant energy storage may be more densely and efficiently provided by adding capacitance at the input of the IBC. Bi-directional operation The BCM power train and control architecture allow bi- directional power transfer, including reverse power processing from the BCM output to its input. Reverse power transfer is enabled if the BCM input is within its operating range and the BCM is otherwise enabled. The BCM’s ability to process power in reverse significantly improves the IBC transient response to an output load dump. PIN/CONTROL FUNCTIONS Figures 2 to 5 provide the IBC’s maximum ambient operating temperature vs. BCM power dissipation for a variety of airflows. In order to determine the maximum ambient environment for a given application, the following procedure should be used: 1. Determine the maximum load powered by the IBC. 2. Determine the power dissipated at this load by the on-board BCM(s). a) If using a 1 BCM configuration, this dissipation is found in Fig. 6 on the appropriate BCM data sheet corresponding to the output voltage of the IBC. b) If using a 2 BCM configuration, divide the maximum load by 2. The power dissipated by each BCM is found in Fig. 6 on the appropriate BCM data sheet corresponding to the output voltage of the IBC. This number should then be multiplied by 2 to reflect the total dissipation. 3. Determine the airflow orientation from Fig.1. 4. Using the chart corresponding to the appropriate airflow angle, find the curve corresponding to the airflow velocity and read the maximum ambient operating temperature of the IBC (y-axis) based on the total BCM power dissipation (x-axis). For additional information on V•I Chip thermal design, please read the "Thermal Management" section of the BCM data sheet. THERMAL MANAGEMENT Factorized Power |
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