Delta Electronics Q48DR User Manual download pdf (Page 7)

DS_Q48DR1R533_03152007

ELECTRICAL CHARACTERISTICS CURVES

Figure 17: Input Terminal Ripple Current-i

, at full rated

output current and nominal input voltage with 12µH source

impedance and 33µF electrolytic capacitor (500 mA/div,

2us/div).

Figure 18: Input reflected ripple current-i

, through a 12µH

source inductor at nominal input voltage and rated load current

(20 mA/div, 2us/div).

StripCopper

Vo(-)

Vo(+)

10u

SCOPE RESISTI

LOAD

Figure 19: Output voltage noise and ripple measurement

test setup

Figure 20: Output voltage ripple at nominal input voltage and

rated load current (Iout1=Iout2=15A)(20 mV/div, 1us/div

)

. Top

trace: Vout2(20mV/div), Bottom trace(20mV/div)

Load capacitance: 1µF ceramic capacitor and 10µF tantalum

capacitor. Bandwidth: 20 MHz. Scope measurements 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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Delta Electronics Q48DR User Manual Page 7