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EV2106DQ/DK-00A View Datasheet(PDF) - Monolithic Power Systems

Part Name
Description
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EV2106DQ/DK-00A
MPS
Monolithic Power Systems MPS
EV2106DQ/DK-00A Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
TM
MP2106 – 1.5A, 15V, 800KHz SYNCHRONOUS BUCK CONVERTER
Choose the compensation resistor to set the
desired crossover frequency. Determine the
value by the following equation:
R3 = 2π × C2 × VOUT × fC
GEA × GCS × VFB
Where fC is the desired crossover frequency
(preferably 33KHz).
Choose the compensation capacitor to set the
zero below one fourth of the crossover
frequency. Determine the value by the following
equation:
C3 >
2
π × R3 × fC
Determine if the second compensation
capacitor, C4 is required. It is required if the
ESR zero of the output capacitor happens at
less than half of the switching frequency. Or:
π × C2 × RESR × fSW > 1
If this is the case, then add the second
compensation capacitor.
Determine the value by the equation:
C4 = C2 × RESR(max)
R3
Where RESR(MAX) is the maximum ESR of the
output capacitor.
External Boost Diode
For input voltages less than or equal to 5V, it is
recommended that an external boost diode be
added. This will help improve the regulator
efficiency. The diode can be a low cost diode
such as an IN4148 or BAT54.
5V
BST 6
MP2106
LX 8
BOOST
DIODE
10nF
MP2106_F03
Figure 3—External Boost Diode
This diode is also recommended for high duty
cycle operation (when VOUT >65%) and high
VIN
output voltage (VOUT>12V) applications.
However, do not exceed the absolute maximum
voltage for these pins.
MP2106 Rev. 1.6
www.MonolithicPower.com
9
2/22/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
 

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