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VHK50W-Q24-S24 Datasheet(PDF) 8 Page - CUI INC |
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VHK50W-Q24-S24 Datasheet(HTML) 8 Page - CUI INC |
8 / 11 page page date DESCRIPTION: chassis mount dc-dc converter 8 of 11 08/2009 20050 SW 112th Ave. Tualatin, Oregon 97062 phone phone 503.612.2300 fax www.v-infinity.com fax 503.612.2383 PART NUMBER: VHK50W 14. OUTPUT SERIES CONNECTIONS Two or more converters can be connected in series to obtain a higher output voltage. To prevent output reverse biasing each other in case of a short, add a Schottky diode on each output in reverse polarity, as shown in the diagram. In the event of a short, the converters will forward-bias the diodes and the output reversal will be limited to one diode drop (about 0.5V) only, so as not to damage the converters. The forward current will cause each converter to go into short-circuit protection. For proper diode selection, make sure that: 1) the diodes voltage rating is higher than each converter output; 2) the rated diode current can carry the short-circuit current; 3) the diodes do not overheat before the short is removed. 15. REMOTE OUTPUT ON/OFF CONTROL The converter output can be enabled or disabled through the On/Off pin. The control logic is shown in this table. A common control circuit is shown below. The standard version defaults to positive logic. For negative logic, indicate the selection when ordering. 16. ISOLATION The input and output of the converter are electrically isolated. If needed, an output terminal can be connected to an input terminal, resulting in the converter non-isolated. Logic Table Negative logic Positive logic SW Closed (V <0.8 V) Output on Output off SW Open (V >2.4 V) Output off Output on REM REM SW High signal here disable output -Vin (pin 4) REM (pin 2) REM -Vin SW REM -Vin -Vo +Vo FIGURE 8. REMOTE ON/OFF CONTROL FIGURE 9. REMOTE ON/OFF CONTROL WITH TRANSISTOR SWITCH +Vin -Vin +Vo -Vo +Vin -Vin +Vo -Vo FIGURE 7. OUTPUT SERIES CONNECTIONS |
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