Delta Electronics Q48SR manual Output voltage noise and ripple measurement test setup

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ELECTRICAL CHARACTERISTICS CURVES

Figure 13: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 12µH source impedance and 33µF electrolytic capacitor (500 mA/div).

Figure 14: Input reflected ripple current, is, through a 12µH source inductor at nominal input voltage and rated load current (5 mA/div).

Copper Strip
Vo(+)
10u	1u	SCOPE	RESISTIVE
10u	1u		LOAD
			LOAD
Vo(-)

Figure 15: Output voltage noise and ripple measurement test setup

Figure 16: Output voltage ripple at nominal input voltage and

rated load current (20 mV/div). Load capacitance: 1µF ceramic

capacitor and 10µF tantalum capacitor. Bandwidth: 20 MHz. Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.

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Contents Features Technical Specifications ParameterElectrical Characteristics Curves Typical input characteristics at room temperature Electrical Characteristics Curves Output voltage noise and ripple measurement test setup Vin=48V Design Considerations Input Source ImpedanceFeatures Descriptions Features Descriptions CON Output Voltage Adjustment TrimThermal Curves Thermal Testing SetupThermal Considerations Thermal DeratingThermal Curves CON Mechanical Drawing Pin No Name FunctionPart Numbering System Model List