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MP2365 – 3A, 28V, 1.4MHz STEP-DOWN CONVERTER
MP2365 Rev. 0.91
7/10/2006
www.MonolithicPower.com
9
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2006 MPS. All Rights Reserved.
To optimize the compensation components for
conditions not listed in Table 3, the following
procedure can be used.
1. Choose the compensation resistor (R3) to set
the desired crossover frequency. Determine the
R3 value by the following equation:
FB
OUT
V
CS
EA
C
V
G
G
f
2
C
×
2
3
R
×
×
×
π
=
Where f
C
is the desired crossover frequency.
2. Choose the compensation capacitor (C3) to
achieve
the
desired
applications with typical inductor values, setting
the compensation zero, f
Z1
, below one forth of the
crossover frequency provides sufficient phase
margin. Determine the C3 value by the following
equation:
phase
margin.
For
C
f
3
R
2
4
3
C
×
×
π
>
3. Determine if the second compensation
capacitor (C6) is required. It is required if the ESR
zero of the output capacitor is located at less than
half of the 1.4MHz switching frequency, or the
following relationship is valid:
2
f
R
2
C
2
1
S
ESR
<
×
×
π
If this is the case, then add the second
compensation capacitor (C6) to set the pole f
P3
at the location of the ESR zero. Determine the
C6 value by the equation:
3
R
R
2
C
6
C
ESR
×
=
External Bootstrap Diode
It is recommended that an external bootstrap
diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The bootstrap diode can be a low
cost one such as IN4148 or BAT54.
MP2365
SW
BS
10nF
5V
Figure 2—External Bootstrap Diode
This diode is also recommended for high duty
cycle operation (when
IN
OUT
V
V
>65%) and high
output voltage (V
OUT
>12V) applications.
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