LP6235 datasheet(5/6 Pages) POWER

5 / 6 page

LP6235

Aug.-2017

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 5 of 6

Preliminary Datasheet

LP6235

Current limit program

A resistor between ISET and GND pin programs

peak output current.Keep traces at this pin as short

as possible.Do not put capacitance at this pin. To set

the over current trip point according to the following

equation:

Iout_LIMIT=100A/R3

Diode Selection

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.

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.

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.

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.

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