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WRB1224S-3WR2 Datasheet(PDF) 6 Page - RSG Electronic Components GmbH |
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WRB1224S-3WR2 Datasheet(HTML) 6 Page - RSG Electronic Components GmbH |
6 / 7 page The copyright and authority for the interpretation of the products are reserved by MORNSUN WRA_S-3WR2 & WRB_S-3WR2 2013.07.22-A/3 Page 6 of 7 TEST CONFIGURATIONS Input Reflected-Ripple Current Test Setup Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate the source impedance. DC Cin Lin DC Load Oscilloscope Current Probe Lin(4.7 µH) Cin(220 µF, ESR < 1.0Ω at 100 KHz) DESIGN CONSIDERATIONS 1) Requirement on output load To ensure this module can operate efficiently and reliably, during operation, the minimum output load could not be less than 5% of the full load, otherwise output ripple maybe increase dramatically. If the actual output power is very small, please connect a resistor with proper resistance at the output end in parallel to increase the load, suppose to use the resistance of 5% rated power, or use our company ’s products with a lower rated output power. 2) Recommended circuit All the WRA_S-3WR2 & WRB_S-3WR2 series have been tested according to the following recommended test circuit before leaving the factory (see Figure 6). If you want to further decrease the input/output ripple, you can increase a capacitance-values properly or choose capacitors with low ESR. However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big, a startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor must be less than the Max. Capacitive Load. General: Cin1: 5V&12V 100 μF 24V&48V 10 μF Cin2: 5V&12V 47 μF 24V&48V 1 μF Lin: 4.7 μH~12μH Cs: 10 μF~22μF Cout: 100 μF(Typ.) Lout: 2.2 μH~10μH Cd: 47nF/100V Single output Dual output +Vo 0V Cout 6 7 8 Cs Cin1 Vin GND 2 1 3 Vc R Lin Ic D1 Cd Cin2 +Vo 0V Cout 6 8 7 Cout Lo ut L out -Vo Ci n1 Vin GND 2 1 Lin 3 Vc R Ic D1 Cd C in2 (Figure 6) 3) Ctrl Terminal When open or high impedance, the converter works well; When this pin is ‘high’, the converter shut down. It should be note that the input current should be between 5-10mA, exceeding the maximum 20mA will cause permanent damage to the converter. The value of R can be derived as follows: 300 - 0 . 1 - - C D C I V V R = For Detailed param eter, please refer to "EMC RECOMMENDED CIRCUIT". 4) Input current When it is used in unregulated power supply, be sure that the fluctuating range of the power supply and the rippled voltage do not exceed the module standard. Input current of power supply should afford the flash startup average current of this kind of DC/DC module (Figure 7). General: Vin:5V Iave =1110mA Vin:12V Iave =640mA Vin:24V Iave =325mA Vin:48V Iave =160mA Input Voltage (V) Input Voltage Range Iave (Figure 7) 5) It is not recommended to increase the output power capability by connecting two or more converters in parallel. The product is not hot-swappable |
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