MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER

MP2487 Rev. 1.0

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11

9/22/2011

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3. Determine if the second compensation

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:

S

OUT

ESR

f

1

2C

R

2

<

π×

×

If this is the case, then add the second

OUT

ESR

COM2

COM

CR

C

R

×

=

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.

MP2487

SW

BST

0.1

υF

5V

Figure 2—External Bootstrap Diode