SP4446EB 데이터 시트보기 (PDF) - Signal Processing Technologies

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SP4446EB

Evaluation Board Manual

Signal Processing Technologies 

USING THE EVALUATION BOARD

1) Powering Up the SP4446 Circuit

The SP4446 Evaluation Board can be powered from inputs from a +1.2V to +7.0V. Connect

with short leads directly to the “Vin” and “Gnd” posts. Monitor the Output Voltage and connect

the Load between the “Vout” post and the 2nd “GND” post.

2) Using the J1 Jumper: Enabling the SP4446 Output and using the Shutdown Mode

The SP4446 output will be Enabled if the J1 Jumper is in the top or pin 1 to 2 position. If J1 is

in the pin 2 to 3 position, the Shutdown pin is brought to GND, which puts the SP4446 in the low

quiescent Shutdown Mode.

3) Selecting the Inductor

In selecting an inductor, the saturation current specified for the inductor needs to be greater

then the SP4446 peak current to avoid saturating the inductor, which would result in a loss in

efficiency and could damage the inductor. The SP4446 evaluation board uses a Murata 10uH

inductor with an Isat value of 450mA and a DCR of 0.39ohms, which easily handles the Ipeak of

350mA of the SP4446 and will deliver high efficiencies. Other inductors could be selected

provided their Isat is greater than the Ipeak of the SP4446.

POWER SUPPLY DATA

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