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SPW48S24-100R Datasheet(PDF) 4 Page - Wall Industries,Inc. |
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SPW48S24-100R Datasheet(HTML) 4 Page - Wall Industries,Inc. |
4 / 13 page TECHNICAL DATASHEET WALL INDUSTRIES, INC. Rev A SPW48S24-100 (888) 597-WALL www.wallindustries.com Page 4 of 13 DESIGN CONSIDERATIONS Under Voltage Lock Out (UVLO) The converter output is disabled until the input voltage exceeds the UVLO turn-on limit. The converter will remain ON until the input voltage falls below the UVLO turn-off limit. Over Current Protection The converter is internally protected from short circuit and over current conditions. During these fault conditions, the converter output will ‘hiccup’. The converter output will recover once the short or over current fault is removed. Over Temperature Protection The converter is protected from over temperature conditions. Upon exceeding this temperature, the converter will shut down. The converter will automatically recover once the over temperature condition is removed. Input Filter No additional input capacitor is needed for the power supply to operate. However, to reduce the input ripple voltage and current beyond what is seen in Photo 1, additional capacitance may be added across the input (see Photo 2). No inductor should be placed between the capacitor and the input to the converter without a termination capacitor (“Cin” Fig. 4). Output Filter No additional output capacitor is needed for the power supply to operate. However, to reduce the ripple and noise on the output, additional capacitance may be added. Usually, a 0.1uF X7R capacitor works best for reducing H.F.spike noise. Also, capacitance in the form of a tantalum or aluminum electrolytic capacitor may also be placed across the output in order reduce base ripple, and improve the transient peak-to-peak voltage deviation. Remote Sense To improve the regulation at the load, route the connections from the -Sense and the +Sense pins to the –Vout and +Vout connections AT the load. This will force the converter to regulate the voltage at the load and not at the pins of the converter (refer to Graph 9). If it is not desired to use the Remotes Sense feature, the –Sense and +Sense pins should be shorted to the -Vout and +Vout pins respectively. Shorting the Sense pins to the Vout pins will reduce the voltage drops through the converter pins. Fusing It is required that the input to the converter be supplied with a maximum 10 A, 250 V rated fuse. Safety The SPW series is CE marked and certified by the following: UL1950 ,CUL950, TUV60950 FILE 155800. The isolation provided by the SPW series is a Basic insulation in accordance with EN60950. SELV output reliability is maintained only if the input to the SPW converter is a SELV source. Remote ON/OFF The converter has the ability to be remotely turned ON or OFF. The SPW series may be ordered Active-High or Active-Low (place an option ‘R’ at the end of the part number). Active-High means that a logic high or open at the ENABLE pin will turn ON the supply. With Active-High, if the ENABLE pin is left floating, the supply will be enabled. Active-Low means that a logic low at the ENABLE pin will turn ON the supply. With Active-Low, if the ENABLE pin is left floating, the supply will be disabled. If remote On/Off is not used on an Active-Low supply, short the Enable pin to –Vin. Figure 2. Remote (L/E) |
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