PAM2805 datasheet(7/9 Pages) PAM

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Over Current Protection

PCB Layout Guidelines

The inductor current during charging period is

detected by a current sensing circuit. When the

value is larger than current limiting I

, the power

NMOS is turned off so that the inductor will be

fo rce d to le ave cha rging st ag e an d en te r

discharging

stage.

Therefore,

the

inductor

peak current will not exceed I

, whose minimum

value is 2A.

As for all switching power supplies, the layout

and components placement of the PAM2805 is

an important step in the design; especially at

h i g h

p e a k c u r r e n t s

a n d

h i g h

s w i t c h i n g

frequencies.

The input capacitor and output capacitor should

be placed respectively as close as possible to

the input pin and output pin of the IC; the inductor

and schottky diode should be placed as close as

possible to the switch pin by using wide and short

traces for the main current path; the current

sense resistor should be placed as close as

possible between the ground pin and feedback

pin.

LIM

Application Information

Power Analog Microelectronics Inc

www.poweranalog.com

11/2011 Rev1.0

PAM2805

3-Modes/3W WLED Driver with 1 or 2 Cell Battery

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