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PQA50-D24-S5-T Datasheet(PDF) 6 Page - CUI INC |
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PQA50-D24-S5-T Datasheet(HTML) 6 Page - CUI INC |
6 / 7 page cui.com CUI Inc │ SERIES: PQA50-T │ DESCRIPTION: DC-DC CONVERTER date 07/15/2015 │ page 6 of 7 1. Requirement on output load Toensurethismodulecanoperateefficientlyandreliably,theminimumoutputloadcannotbelessthan5%ofthefullloadduring operation. If the actual output power is small, please connect a resistor at the output end in parallel to increase the load. 2. Recommended circuit This series has been tested according to the following recommended testing circuit before leaving the factory. This series should be testedunderload(seeFigure3).Ifyouwanttofurtherdecreasetheinput/outputripple,youcanincreasecapacitanceproperlyor choose capacitors with low ESR (see table 3). However, the capacitance must not exceed the maximum capacitive load or a start-up problem might arise (see table 4). 3. Output Voltage Trimming Leave open if not used. FormulaforTrimResistor Application Circuit for Trim Pin (part in broken line is the interior of models) Note: Value for R1, R2, R3, and Vref (see Table 5) R T: Trim Resistor a:User-definedparameter,noactualmeanings Vo': The trim up/down voltage up: a= Vref Vo’-Vref R1 R= aR2 R-a 2 -R3 down: a= Vref Vo’-Vref R2 R= T T aR1 R-a 1 -R3 APPLICATION NOTES Figure 3 Table 3 Table 4 Table 5 Figure 4 Vout (Vdc) Cin (µF) Cout (µF) 3.3 100 220 5 100 220 12 100 100 15 100 100 24 100 47 Notes: 1. Minimum load shouldn't be less than 5%, otherwise ripple may increase dramatically. Operation under minimum load will not damage the converter, however, they may notmeetallspecificationslisted. 2. Maximum capacitive load is tested at input voltage range and full load. 3.AllspecificationsaremeasuredatTa=25°C,humidity<75%,nominalinputvoltageandratedoutputloadunlessotherwisespecified. +Vo 0V R2 R1 R3 Vref RT Trim 0V R2 R1 R3 Vref RT Trim +Vo Trim up Trim down DC DC Vin GND +Vout 0V Cin Vout (Vdc) Max. Capacitive Load (μF) 3.3 27000 5 18900 12 3700 15 2000 24 1000 Vout (Vdc) R1 (kΩ) R2 (kΩ) R3 (kΩ) Vref (V) 3.3 4.788 2.87 15 1.24 5 2.87 2.87 12.1 2.5 12 11 2.87 22 2.5 15 15 3 22 2.5 24 20 2.308 15 2.5 For more information, please visit the product page. |
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