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參數(shù)資料
| 型號(hào)： | MP1541_06 |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 1.3MHz Boost Converter |
| 中文描述： | 1.3MHz升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 322K |
| 代理商： | MP1541_06 |
MP1541 – 1.3MHz BOOST CONVERTER
MP1541Rev.1.3
3/20/2006
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
Compensation
The MP1541 uses an amplifier to compensate
the feedback loop rather than a traditional
transconductance amplifier like most current
mode regulators. Frequency compensation is
provided by an internal resistor and capacitor
along with an external resistor. The system
uses two poles and one zero to stabilize the
control loop. The poles are f
P1
set by the output
capacitor and load resistance, and f
P2
set by the
internal compensation capacitor Cc, the gain of
the error amplifier and the resistance seen
looking out at the feedback node R
EQ
. The zero
f
Z1
is set internally around 20kHz. These are
determined by the equations:
LOAD
1
P
R
2
C
1
×
f
×
π
=
(
9
)
EQ
9
2
P
R
10
2
1
f
×
×
×
π
×
=
kHz
20
f
1
Z
=
Where R
LOAD
is the load resistance and R
EQ
is:
)
R
1
R
(
)
R
1
R
(
3
R
R
EQ
+
×
+
=
Where R1, R2, and R3 are seen in Figure 2.
The DC loop gain is:
2
OUT
V
FB
LOAD
IN
VDC
V
R
V
500
A
=
There is also a right-half-plane zero (f
RHPZ
) that
exists in all continuous mode (inductor current
does not drop to zero on each cycle) step up
converters. The frequency of the right half plane
zero is:
2
OUT
V
LOAD
2
IN
π
RHPZ
L
2
R
×
V
×
f
×
×
=
To stabilize the regulation control loop, the
crossover frequency (the frequency where the
loop gain drops to 0dB or a gain of 1, indicated
as f
C
) should be at least one decade below the
right-half-plane zero and should be at most
75kHz. f
RHPZ
is at its lowest frequency at
maximum output load current (R
LOAD
is at a
minimum) and minimum input voltage.
For the MP1541 it is recommended that a 47k
to 100k
resistor be placed in series with the FB
pin and the resistor divider as seen in Figure 2.
For most applications this is all that is needed for
stable operation. If greater phase margin is
needed a series resistor and capacitor can be
placed in parallel with the high-side resistor R1 as
seen in Figure 2. The pole and zero set by the
lead-lag compensation network are:
+
+
+
×
×
π
×
=
3
R
1
2
R
1
1
R
1
1
4
R
3
C
2
1
f
3
P
(
)
4
R
1
R
3
C
2
1
×
f
2
Z
+
×
π
×
=
LAYOUT CONSIDERATIONS
High frequency switching regulators require
very careful layout for stable operation and low
noise. All components must be placed as close
to the IC as possible. Keep the path between
L1, D1, and C2 extremely short for minimal
noise and ringing. C1 must be placed close to
the IN pin for best decoupling. All feedback
components must be kept close to the FB pin to
prevent noise injection on the FB pin trace. The
ground return of C1 and C2 should be tied
close to the GND pin. See the MP1541 demo
board layout for reference.
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| MP1541DJ | MP1541 TFT Applications Evaluation Board |
| MP1541 | 1.3MHz Low Power LED Torch/Flash Driver |
| MP1542DH | 700KHz/1.3MHz Boost Converter with a 2A Switch |
| MP1542DK | 700KHz/1.3MHz Boost Converter with a 2A Switch |
| MP1542 | 700KHz/1.3MHz Boost Converter with a 2A Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MP1541DJ | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:1.3MHz Boost Converter |
| MP1541DJ-LF-P | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.3MHz, 22V Step-up 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 |
| MP1541DJ-LF-Z | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.3MHz, 22V Step-up 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 |
| MP1542 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:700KHz/1.3MHz Boost Converter with a 2A Switch |
| MP1542_06 | 制造商:MPS 制造商全稱:Monolithic Power Systems 功能描述:700KHz/1.3MHz Boost Converter with a 2A Switch |
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