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VHK50W-Q24-S48 Datasheet(PDF) 5 Page - CUI INC |
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VHK50W-Q24-S48 Datasheet(HTML) 5 Page - CUI INC |
5 / 11 page page date DESCRIPTION: chassis mount dc-dc converter 5 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 4. INPUT CURRENT The input voltage source must be able to provide enough current to the converter, otherwise it may not start up or operate properly. A typical symptom is not starting or unusually low output voltage. In general, it is recommended to be able to provide at least: Ipeak = 150%*Pout/( ηη*Vmin) where Pout is the maximum output power, Vmin is the minimum input voltage and η is the converter's efficiency. As an example, for VHK50W-Q24-S5 to operate with 9~36V input, 50W output and an efficiency of 81%, the minimum source current is recommended to be: Ipeak = 150% * 50 / (81% * 9) = 10.29A. 5. INPUT FUSE To limit the input current and to facilitate input reversal protection and input OVP protection, a fast-acting input fuse is recommended for the input line. The fuse rating will depend on the input range and should allow for the maximum current at the lowest input voltage, as shown in this equation: Ipeak = 150%*Pout/( ηη*Vmin). In the previous example of VHK50W-Q24-S5, the peak input current at 9V was calculated to be 10.29A. A 10A or a 15A fuse may be suitable for this application. Make sure the fuse voltage rating is higher than the maximum input voltage. 6. INPUT OVP It is important to ensure the input voltage does not exceed the maximum rated input voltage for that model. To suppress voltage transients of short durations, the converter includes a transient voltage suppression device (TVS) at the input. The built-in TVS has a rated breakdown voltage of 39V for the VHK50W-Q24-XX models and 82V for the VHK50W-Q48 models. With small transients of short-durations, the TVS will limit the input voltage without interrupting the converters operations. For large transients, the TVS may conduct a large amount of current that may trip the input fuse. Without the input fuse, the converter may suffer permanent damages. When the fuse is open, replace it with one of same type and ratings. 7. INPUT REVERSAL PROTECTION If the input voltage is reversed for any reason, the built-in protection circuits in the converter will limit the reverse voltage to one diode drop which is no more than 1V. With an external input fuse connected, the fuse will open and thus remove power from the converter. Check the wiring and make corrections as needed. The input fuse will need to be replaced. Make sure the new fuse is of the same type and rating. Without the input fuse, the converter may suffer permanent damages in a reversal situation. 8. REMOTE SENSE The converter provides regulated outputs at the output terminals. When there is a large current and/or the output cable is of some length, the voltage at the end of the output cable may be noticeably lower than at the terminals. The converter can compensate up to 0.5V of voltage drop through remote sense terminals. To ensure accurate regulation, run two separate wires (twisted) from the desired regulation points to the remote sense terminals, as shown below. Even if the load current is low, still connect +Vo to +S and -Vo to -S. +Vo +S Trim -S -Vo (-) (+) Load FIGURE 2. REMOTE SENSE |
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