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V28C5C50BL Datasheet(PDF) 7 Page - Vicor Corporation |
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V28C5C50BL Datasheet(HTML) 7 Page - Vicor Corporation |
7 / 11 page 28 V Wide Micro Family Rev 2.0 vicorpower.com Page 7 of 11 12/2014 800 927.9474 28 V Wide Input Module Enable/Disable The module may be disabled by pulling PC to 0 V (2.3 V max) with respect to the –Input. This may be done with an open collector transistor, relay, or optocoupler. Converters may be disabled with a single transistor or relay either directly or via “OR’ing” diodes for 2 or more converters. See Figure 2. Primary Auxiliary Supply During normal operation only, the PC Pin can source 5.7 V @ 1.5 mA. In the example shown in Figure 4, PC powers a mod- ule enabled LED. Module Alarm The module contains “watchdog” circuitry which monitors input voltage, operating temperature and internal operating parameters. In the event that any of these parameters are outside of their allowable operating range, the module will shut down and PC will go low. PC will periodically go high and the module will check to see if the fault (as an example, Input Undervoltage) has cleared. If the fault has not been cleared, PC will go low again and the cycle will restart. The SC pin will go low in the event of a fault and return to its nor- mal state after the fault has been cleared. See Figures 3 and 5. PRIMARY CONTROL - PC PIN Disable Disable = PC < 2.3 V +IN PC PR –IN Figure 2 — Module enable/disable. Figure 4 — LED on-state indicator. 4 k Ω "Module Enabled" +IN PC PR –IN Optocoupler +IN PC PR –IN 4 k Alarm 1.00 V +OUT SC –OUT Comparator Input Undervoltage Input Overvoltage [a] Over Temperature Module Faults 2-20 ms typ. f(VIN) Auto Restart 5.7 Vdc (0-3 mA) 50 Ω SW2 SW3 1.23 Vdc 6 K 1 K SW1 SW1, 2, & 3 shown in "Fault" position +OUT SC –OUT +IN PC PR –IN [a] Not applicable for 300 Vdc Input family 1 M Figure 3 — PC/SC module alarm logic. Figure 6 —Isolated on-state indicator. 2-20 ms typ. Fault SC PC 1.23 V 5.7 V 40 µs typ. Figure 5 —PC/SC module alarm timing. Figure 7 — Secondary side on-state indicator. |
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