LP6221 datasheet(6/7 Pages) POWER

6 / 7 page

LP6226/A-04

May.-2013

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Page 6 of 7

Preliminary Datasheet

LP6226/A

To achieve high efficiency, Schottky diode is good

choice for low forward drop voltage and fast

switching time. The output diode rating should be

able to handle the maximum output voltage, average

power dissipation and the pulsating diode peak

current.

Output Capacitor Selection

For lower output voltage ripple, low-ESR ceramic

capacitors are recommended. The tantalum

capacitors can be used as well, but the ESR is bigger

than ceramic capacitor. The output voltage ripple

consists of two components: one is the pulsating

output ripple current flows through the ESR, and the

other is the capacitive ripple caused by charging and

discharging.

Input Capacitor Selection

For better input bypassing, low-ESR ceramic

capacitors are recommended for performance. A

10μF input capacitor is sufficient for most

applications. For a lower output power requirement

application, this value can be decreased.

Layout Guideline

For high frequency switching power supplies, the

PCB layout is important step in system application

design. In order to let IC achieve good regulation,

high efficiency and stability, it is strongly

recommended the power components should be

placed as close as possible. The set races should be

wide and short. The feedback pin and then works of

feedback and compensation should keep away from

the power loops, and be shielded with a ground trace

or plane to prevent noise coupling.

LP6221 датащи(PDF) 6 Page - Lowpower Semiconductor inc