Electronic Components Datasheet Search |
|
FARM1EK1 Datasheet(PDF) 6 Page - Vicor Corporation |
|
FARM1EK1 Datasheet(HTML) 6 Page - Vicor Corporation |
6 / 11 page FARM™ Rev 6.9 vicorpower.com Page 6 of 11 06/2017 800 927.9474 FARMxxxx Figure 9 — Offline Power Supply Configuration Application Note (Cont.) Off-Line Power Supply Configuration The FARM maintains the DC output bus voltage between 250 and 370VDC over the entire input voltage range, which is compatible with Vicor 300V input converters. The FARM automatically switches to the proper bridge or doubler mode depending on the input voltage, eliminating the possibility of damage due to improper line connection. The FARM1xxx is rated at 500W in the low range (90 – 132VAC input), and 750W in the high range (180 – 264VAC input). The FARM2xxx is rated for 750W and 1000W for the low and high input ranges respectively. Either of these modules can serve as the AC front end for any number and combination of compatible converters as long as the maximum power rating is not exceeded. Strap (ST) Pin: In addition to input and output power pin connections, it is necessary to connect the Strap pin to the center junction of the series hold-up capacitors (C1, C2, see Figure 9) for proper (autoranging) operation. Metal oxide varistors, V1 and V2 provide capacitor protection. The bleeder resistors (R1, R2, see Figure 9) discharge the hold-up capacitors when power is switched off. Capacitors C7 and C8 are recommended if the hold-up capacitors are located more than 3 inches (75mm) from the FARM output pins. Enable (EN) Pin: (See Figure 10) The Enable pin must be connected to the PC or Gate-In pin of all converter modules to disable the converters during power up. Otherwise, the converters would attempt to start while the hold-up capacitors were being charged through an unbypassed current limiting thermistor, preventing the bus voltage from reaching the thermistor bypass threshold, thus disabling the power supply. The Enable output (the drain of an N channel MOSFET) is internally pulled up to 15V through a 150kΩ resistor. A signal diode should be placed close to and in series with the PC or (Gate-In) pin of each converter to eliminate the possibility of control interference between converters. The Enable pin switches to the high state (15V) with respect to the negative output power pin to turn on the converters after the power up inrush is over. The Enable function also provides input overvoltage protection for the converters by turning off the converters if the DC bus voltage exceeds 400VDC. The thermistor bypass switch opens if this condition occurs, placing the thermistor in series with the input voltage, which reduces the bus voltage to a safe level while limiting input current in case the varistors conduct. The thermistor bypass switch also opens if a fault or overload reduces the bus voltage to less than 180VDC. CAUTION: There is no input to output isolation in the FARM, hence the –OUT of the FARM and thus the –In of the downstream DC-DC converter(s) are at a high potential. If it is necessary to provide an external enable/ disable function by controlling the DC-DC converter’s PC pin (referenced to the –IN) of the converter an opto-isolator or isolated relay should be employed. +IN PC (GATE IN) PR –IN +IN PC (GATE IN) PR –IN Vicor DC-DC Converter R1 R2 C1 C2 V1 V2 D2 D1 C3 C5 C4 C6 F1 F2 Vicor DC-DC Converter To additional modules C7** C8** FARM Filter/Autoranging Rectifier Module N EMI GND N/C L + BOK ST EN – Z1 C9 L PE N R3 D4 C11 C10 D3 R4 F3 * Vicor Part Description Part Number C1,2 Hold-up capacitors C3-C6 4,700pF (Y2 type) 01000 C7,8** Film Cap., 0.61µF 34610 C9 0.47µF 03047 C10,C11 0.001µF D1, 2 Diode 00670 D3, 4 1N5817 26108 F1, F2 Use recommended fusing for specific DC-DC Converters R1, 2 150k , 0.5W R3, 4*** 250 V1,2 220VMOV 30234-220 Z1 MOV 270 30076 Sizing PCB traces: All traces shown in bold carry significant current and should be sized accordingly. N/ST/L 10A RMS at 90VAC and 500W ± IN 4 ADC at 190VDC and 750W FARM2-xxx N/ST/L 20A RMS at 90VAC and 750W ± IN 8ADC at 190VDC and 1000W * See Agency Approvals on FARM data sheet. ** Required if C1 & C2 are located more than 3 in (75mm) from output of the FARM. ***Not used with VI-260/VI-J60 Not used with VI-260/VI-J60 |
Similar Part No. - FARM1EK1 |
|
Similar Description - FARM1EK1 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |