MP2487 MPS, MP2487 Datasheet - Page 11

• Manufacturer Part Number: MP2487
• Description: 55v, 1a High Power Led Driver
• Manufacturer: MPS

3. Determine if the second compensation
capacitor (C
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:
If this is the case, then add the second
compensation capacitor (C
f
C
MP2487 Rev. 0.9
1/26/2010
P3
COM2
at the location of the ESR zero. Determine the
value by the equation:
COM2
2
C
π ×
COM2
) is required, which is connected
C
OUT
=
1
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
C
×
OUT
R
R
ESR
COM2
COM
×
R
<
ESR
) to set the pole
f
2
S
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MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER
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:
The bootstrap diode can be a low cost one such
as IN4148 or BAT54.
There is a 5V rail available in the system;
VIN is not greater than 5V;
VOUT is between 3.3V and 5V;
Figure 2—External Bootstrap Diode
MP2487
BST
SW
5V
0.1υF
11