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MP1472 Datasheet(PDF) 9 Page - Monolithic Power Systems

Part # MP1472
Description  2A, 18V Synchronous Rectified Step-Down Converter
Download  13 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1472 Datasheet(HTML) 9 Page - Monolithic Power Systems

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MP1472 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
MP1472 Rev. 1.0
www.MonolithicPower.com
9
9/2/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
The DC gain of the voltage feedback loop is
given by:
OUT
FB
EA
CS
LOAD
VDC
V
V
A
G
R
A
Where AVEA is the error amplifier voltage gain;
GCS is the current sense transconductance and
RLOAD is the load resistor value.
The system has two poles of importance. One is
due to the compensation capacitor (C3) and the
output resistor of the error amplifier, and the
other is due to the output capacitor and the load
resistor. These poles are located at:
VEA
EA
1
P
A
3
C
2
G
f
LOAD
2
P
R
2
C
2
1
f
Where GEA is the error amplifier transconductance.
The system has one zero of importance, due to the
compensation capacitor (C3) and the compensation
resistor (R3). This zero is located at:
3
R
3
C
2
1
f 1
Z
The
system
may
have
another
zero
of
importance, if the output capacitor has a large
capacitance and/or a high ESR value. The zero,
due to the ESR and capacitance of the output
capacitor, is located at:
ESR
ESR
R
2
C
2
1
f
In this case, a third pole set by the compensation
capacitor (C6) and the compensation resistor
(R3) is used to compensate the effect of the ESR
zero on the loop gain. This pole is located at:
3
R
6
C
2
1
f 3
P
The goal of compensation design is to shape the
converter transfer function to get a desired loop
gain. The system crossover frequency where the
feedback loop has the unity gain is important.
Lower crossover frequencies result in slower line
and load transient responses, while higher
crossover frequencies could cause system
instability. A good rule of thumb is to set the
crossover frequency below one-tenth of the
switching frequency.
Table 3 lists the typical values of compensation
components for some standard output voltages
with various output capacitors and inductors. The
values of the compensation components have
been optimized for fast transient responses and
good stability at given conditions.
Table 3—Compensation Values for Typical
Output Voltage/Capacitor Combinations
VOUT
L1
C2
R3
C3
C6
1.8V
6.8uH
22μF/6.3V
Ceramic
3.3kΩ
5.6nF
None
3.3V
10μH
22μF/6.3V
Ceramic
5.6kΩ
3.3nF
None
5.0V
15μH
22μF/6.3V
Ceramic
10kΩ
2.2nF
None
12.0V
22μH
22μF/16V
Ceramic
15kΩ
1.0nF
None
To optimize the compensation components, 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
CS
EA
S
FB
OUT
CS
EA
C
V
V
G
G
f
1
.
0
2
C
2
V
V
G
G
f
2
C
2
3
R
Where fC is the desired crossover frequency
which is typically below one tenth of the switching
frequency.
2. Choose the compensation capacitor (C3) to
achieve
the
desired
phase
margin.
For
applications with typical inductor values, setting
the compensation zero, fZ1, below one-forth of the
crossover frequency provides sufficient phase
margin.
Determine the C3 value by the following equation:
C
f
3
R
2
4
3
C
where R3 is the compensation resistor.


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