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 Manual(4) Input Voltage Range/Input Current Range!Keep the input voltage ripple within the specifi cation below. Outputripple voltage will increase as these values increase.Ripple voltage CQHS250/300/350 : less than 4Vp-p!Make sure that the peak input voltage stays within the specifi edinput voltage range of the power module.!Choose a front end power supply that can supply enough currentIp (Fig. 2.2) for starting up the power module.Input voltage [V]Input current [A]2.2 Wiring output pinTimeFig.2.1 Input Voltage RippleFig.2.2 Input Current CharacteristicslpInput voltage [V](5) Reverse Input Voltage ProtectionInput voltage range!Avoid applying reversed-polarity voltage to the power module as itwill damage the power module. To protect the power module fromreversed polarity voltage, installing an external diode as shown inFig. 3.3 is recommended.+VINDC IN-VINRipplevoltageFig.2.3 Reverse Input Voltage Protection!Install an external capacitor Cout between +VOUT and -VOUT toincrease stability of output (Fig. 1.1 and Fig.1.2).Recommended capacitance of Cout is shown in Table 2.2 andTable 2.3.!Choose a high frequency type electrolytic capacitor for Cout. Outputripple and rise time will be infl uenced by the capacitor’s ESRand ESL and the wiring impedance.!As ripple current will fl ow through capacitor Cout, pay attention tothe ripple current rating of the capacitor.!Install capacitor Cout as close to the power module as possible(within 50mm).This is useful for reducing radiated noise and increasing stabilityof the power module operation.!When the capacitance of external output capacitor Cout is high, itmay unstabilize the operation of power supply, so please refer toTable 2.2 and Table 2.3 for the value of the external capacitor Cout.tInput voltage rangeTable 2.2 Capacitance Values for External Output Capacitor Cout [ F](CQHS250)Recommended capacitanceOutputMaximumAmbient temperaturevoltage(V)capacitanceTa=-40~-20C Ta=-20~0C Ta=0~+85C324704702202200503301001001000Table 2.3 Capacitance Values for External Output Capacitor Cout [ F](CQHS300/CQHS350)Recommended capacitanceOutputMaximumBase plate temperaturevoltage(V)capacitanceTc=-40~-20C Tc=-20~0C Tc=0~+100C32470X2470X2470330050330X23303302200! The specifi ed ripple and ripple noise are measured by the methodintroduced in Fig. 2.4 and Fig.2.5.? CQHS250DCinputCin++VIN＋VOUTRC-VINOscilloscopeBW：100MHz+S-VOUT-SRC50mmCout+1. 5m 50WCoaxial CableR=50WC=0.01mFMeasuring board0.1mFLoadFig.2.4 Method of Measuring Output Ripple and Ripple Noise(CQHS250)? CQHS300/CQHS350DCinputCYCinMounting+S4700pF hole+VIN＋VOUT+RC-VINOscilloscopeBW：100MHz-VOUT-SCout+RC50mmCo+1. 5m 50WCoaxial CableR=50WC=0.01mFMeasuring board0.1mFLoadCo 32V：470mF50V：220mFFig.2.5 Method of Measuring Output Ripple and Ripple Noise(CQHS300/CQHS350)CQHS-14