Delta Electronics Series H48SA manual Output voltage noise and ripple measurement test setup

ELECTRICAL CHARACTERISTICS CURVES

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Figure 13: Input Terminal Ripple Current, ic, at nominal input voltage and rated load current with 12µH source impedance and 100µF electrolytic capacitor, 500 mA/div, 2us/div.

Figure 14: Input reflected ripple current, is, through a 12µH source inductor at nominal input voltage and rated load current, 20 mA/div, 2us/div.

Copper Strip
Vo(+)
10u	1u	SCOPE	RESISTIVE
			LOAD
Vo(-)			0

Figure 15: Output voltage noise and ripple measurement test setup

	12
	10
(V)	8
Voltage
	6
Output
	4

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Output Current (A)

Figure 17: Output voltage vs. load current showing typical current limit curves and converter shutdown points.

Figure 16: Output voltage ripple at nominal input voltage and

rated load current, 50mV/div, 2us/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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DS_H48SA12025_05052008