MP2488 datasheet(11/14 Pages) MPS

11 / 14 page

MP2488 – 2A, 200kHz, 55V HIGH-POWER LEDS DRIVER

MP2488 Rev. 1.0

www.MonolithicPower.com

6/20/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

3. Determine if the second compensation

capacitor (CCOM2) is required, which is connected

from COMP pin to GND. It is required if the ESR

zero of the output capacitor is located at less

than half of the switching frequency:

OUT

ESR







If this is the case, then add the second

compensation capacitor (CCOM2) to set the pole

fP3 at the location of the ESR zero. Determine the

CCOM2 value by the equation:

OUT

ESR

COM2

COM





External Bootstrap Diode

An external bootstrap diode may enhance the

efficiency of the regulator. In below cases, an

external BST diode is recommended from the 5V

to BST pin:



There is a 5V rail available in the system;



VIN is not greater than 5V;



VOUT is between 3.3V and 5V;

The bootstrap diode can be a low cost one such

as IN4148 or BAT54.

MP2488

BST

Figure 2—External Bootstrap Diode

MP2488 Datasheet(PDF) 11 Page - Monolithic Power Systems