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參數(shù)資料
| 型號(hào)： | MP1593_06 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 3A, 28V, 385KHz Step-Down Converter |
| 中文描述： | 第3A，28V的，385KHz降壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大?。?/td> | 326K |
| 代理商： | MP1593_06 |
MP1593 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
MP1593 Rev. 1.9
9/14/2006
www.MonolithicPower.com
8
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
Compensation Components
The MP1593 employs current mode control for
easy compensation and fast transient response.
The system stability and transient response are
controlled through the COMP pin. COMP is the
output of the internal transconductance error
amplifier.
A
series
combination sets a pole-zero combination to
control the characteristics of the control system.
capacitor-resistor
The DC gain of the voltage feedback loop is
given by:
OUT
V
FB
VEA
CS
LOAD
VDC
V
A
G
R
A
×
×
×
=
Where A
VEA
is the error amplifier voltage gain,
G
CS
is the current sense transconductance and
R
LOAD
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 error amplifier, while the
other is due to the output capacitor and the load
resistor. These poles are located at:
VEA
EA
3
1
P
A
C
2
G
f
×
×
π
=
LOAD
2
P
R
2
C
2
1
×
f
×
π
=
Where
transconductance.
G
EA
is
the
error
amplifier
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
×
×
π
=
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
×
×
π
=
In this case (as shown in Figure 3), a third pole
set by the compensation capacitor (C6) and the
compensation
resistor
compensate the effect of the ESR zero on the
loop gain. This pole is located at:
(R3)
is
used
to
3
R
6
C
2
1
f
3
P
×
×
π
=
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 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 standard is to set the
crossover frequency to approximately one-tenth
of the switching frequency. The switching
frequency for the MP1593 is 385KHz, so the
desired crossover frequency is around 38KHz.
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
responses
and
good
conditions.
for
stability
fast
transient
at
given
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MP1593DN | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:3A, 28V, 385KHz Step-Down Converter |
| MP1593DN-LF | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 3A 28V 385kHz Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP1593DN-LF-Z | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 3A 28V 385kHz Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MP15A0.5 | 功能描述:變阻器 50watt .5ohm RoHS:否 制造商:Ohmite 類型:Wirewound 功率額定值:25 W 電阻:25 Ohms 電壓額定值:500 V 容差:10 % 端接類型:Solder Lug 轉(zhuǎn)數(shù):300 錐度:Linear |
| MP15A1 | 功能描述:變阻器 50watt 1ohm RoHS:否 制造商:Ohmite 類型:Wirewound 功率額定值:25 W 電阻:25 Ohms 電壓額定值:500 V 容差:10 % 端接類型:Solder Lug 轉(zhuǎn)數(shù):300 錐度:Linear |
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