title: COSEL Power Supply, Noise Filter 2025 Product Catalog

Summary

COSEL Power Supply, Noise Filter 2025 Product Catalog

DC-DC Converters Bus Converter . Power Module TypeInstruction Manual3.5 Remote sensing(1) When Remote Sensing is Not Used+S+VOUT+CoutLoad-VOUT-SShort at pin rootFig. 3.2 When Remote Sensing is Not Used!When remote sensing is not used, make sure +VOUT and +S areshorted, and that -VOUT and -S are shorted as well.!Keep the patterns between +S and +VOUT and between -S and-VOUT as short as possible. Avoid a looping pattern. If noise entersthe loop, the operation of the power module will become unstable.(2) When Remote Sensing is UsedWire as close as possible+S+VOUT+CoutLoad-VOUT-SFig. 3.3 When Remote Sensing is Used!Using remote sensing with long wires may cause output voltage tobecome unstable. Consult us if long sensing wiring is necessary.!Sensing patterns or wires should be as short as possible. If wiresare used, use either twisted-pair or shielded wires.!Use wide PCB patterns or thick wires between the power moduleand the load. Line drop should be kept less than 0.3V. Make sureoutput voltage from the power module stays within the specifi edrange.!If the sensing patterns are shorted by mistake, a large current mayfl ow and damage the pattern. This can be prevented by installingfuses or resistors close to the load.As wiring or load impedance may generate oscillation or largefluctuations in output voltage, make sure enough evaluation isgiven in advance.3.6 Adjustable voltage range(1) Output voltage adjusting!Output voltage is adjustable by the external potentiometer.!When the output voltage adjustment is used, note that the overvoltage protection circuit operates when the output voltage setstoo high.!If the output voltage drops under the output voltage adjustmentrange, note that the Low voltage protection operates.!By connecting the external potentiometer (VR1)and resistors(R1,R2),output voltage becomes adjustable, as shown in Fig.3.4,recommended external parts are shown in Table 3.2.!The wiring to the potentiometer should be as short as possible.The temperature coefficient becomes worse, depending on thetype of a resistor and potentiometer. Following parts are recommendedfor the power supply.Resistor ............. Metal film type, coefficient of less than±100ppm/CPotentiometer .... Cermet type, coeffi cient of less than±300ppm/C!When the output voltage adjustment is not used, open the TRMpin respectively.+VOUTCQHS+SControl Amp.R1of ratedvoltage－RA12kW2.5V＋TRMR2 2 VR15kWRB RC32kW1kW-SFig. 3.4 Output voltage control circuit-VOUTTable 3.2 Recommended Values of External ResistorsAdjustable rangeNo. VOUT VOUT±5%VOUT±10%R1 R2 R1 R21 32V 51kW51kW11kW6.2kW2 50V 82kW 82kW(2) Output voltage decreasing!By connecting the external resistor(RD), output voltage becomesadjustable to decrease.The external resistor(RD) is calculated the following equation.RD=100％Δ％-2 [kW]％= VOR－VODVORX100CQHS+VOUT+STRMRDVOR :Rated output voltage[V]VOD :Output voltage needed to set up[V]-S-VOUTFig. 3.5 Connection for output voltage decreasingCQHS-16