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SS23 数据表(PDF) 7 Page - Monolithic Power Systems

部件名 SS23
功能描述  2A, 32V, 330KHz Step-Down Converter
Download  11 Pages
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制造商  MPS [Monolithic Power Systems]
网页  http://www.monolithicpower.com
标志 MPS - Monolithic Power Systems

SS23 数据表(HTML) 7 Page - Monolithic Power Systems

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MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER
MP1591 Rev. 2.3
www.MonolithicPower.com
7
9/27/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
Compensation
The system stability is controlled through the
COMP pin. COMP is the output of the internal
transconductance error amplifier. A series
capacitor-resistor combination sets a pole-zero
combination to control the characteristics of the
control system. The DC loop gain is:
LOAD
CS
VEA
OUT
REF
VDC
R
G
A
V
V
A
×
×
×
=
Where VREF is the feedback threshold voltage,
1.230V, AVEA is the transconductance error
amplifier voltage gain, 400 V/V, and GCS is the
current sense gain (roughly the output current
divided by the voltage at COMP), 3.5 A/V.
The system has 2 poles of importance; one is
due to the compensation capacitor (C4) and the
other is due to the output capacitor (C5). These
are:
)
4
C
A
2
(
G
f
VEA
MEA
1
P
×
×
π
=
Where fP1 is the first pole, and GMEA is the error
amplifier transconductance (770µS) and
)
5
C
R
2
(
1
f
LOAD
2
P
×
×
π
=
The system has one zero of importance due to
the compensation capacitor (C4) and the
compensation resistor (R3) which is
)
4
C
3
R
2
(
1
f 1
Z
×
×
π
=
If large value capacitors with relatively high
equivalent-series-resistance (ESR) are used,
the zero due to the capacitance and ESR of the
output capacitor can be compensated by a third
pole set by R3 and C3
)
3
C
3
R
2
(
1
f 3
P
×
×
π
=
The system crossover frequency fC, (the
frequency where the loop gain drops to 1, or
0dB) is important. A good rule of thumb is to set
the crossover frequency to approximately one
tenth of the switching frequency. In this case,
the switching frequency is 330KHz, so use a
crossover
frequency
of
33KHz.
Lower
crossover frequencies result in slower response
and worse transient load recovery. Higher
crossover frequencies can result in instability.
Choosing the Compensation Components
The values of the compensation components
given in Table 4 yield a stable control loop for
the output voltage and given capacitor.
Table 4—Compensation Values for Typical
Output Voltage/Capacitor Combinations
VOUT
C5
R3
C3
C4
2.5V
22µF Ceramic
3.9kΩ
None
4.7nF
3.3V
22µF Ceramic
5.1kΩ
None
3.9nF
5V
22µF Ceramic
7.5kΩ
None
2.7nF
12V
22µF Ceramic
18kΩ
None
1.2nF
2.5V
47µF SP-Cap
8.2kΩ
None
2.2nF
3.3V
47µF SP-Cap
10kΩ
None
2.2nF
5V
47µF SP-Cap
16kΩ
None
1.5nF
12V
47µF SP-Cap
36kΩ
None
1nF
2.5V
560µF/6.3V, AL
30mΩ ESR
100kΩ
150pF
1nF
3.3V
560µF/6.3V, AL
30mΩ ESR
120kΩ
120pF
1nF
5V
470µF/10V, AL
30mΩ ESR
150kΩ
82pF
1nF
12V
220µF/25V, AL
30mΩ ESR
180kΩ
33pF
1nF
Note: “AL” = Electrolytic


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