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參數(shù)資料
| 型號(hào)： | SP6123 |
| 英文描述： | Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| 中文描述： | 低，同步降壓電壓降壓PWM控制器，適合2A至10A條，占地面積小，DC - DC電源轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | SP6123 |
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13
Date: 5/25/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller Copyright 2004 Sipex Corporation
f
P(LC)
= 1
2
π√
LC
OUT
The open loop gain of the whole system can be
divided into the gain of the error amplifier,
PWM modulator, buck converter, and feedback
resistor divider. In order to crossover at the
selected frequency f
co
, the gain of the error
amplifier has to compensate for the attenuation
caused by the rest of the loop at this frequency.
In the RC network shown in Figure 1, the product
of R1 and the error amplifier transconductance
determines this gain. Therefore, R1 can be de-
termined from the following equation that takes
into account the typical error amplifier
transconductance, reference voltage and PWM
ramp built into the SP6123.
R
1
= 2083V
OUT
f
CO
f
Z(ESR)
V
IN
f
P(LC)2
In Figure 1, R1 and C1 provides a zero f
Z1
which
needs to be placed at or below f
P(LC)
. If f
Z1
is
made equal to f
P(LC)
for convenience, the value
of C
1
can be calculated as
C
1
=
1
2
π
f
P(LC)
R
1
The optional C
2
generates a pole f
P1
with R
1
to
cut down high frequency noise for reliable op-
eration. This pole should be placed one decade
higher than the crossover frequency to avoid
erosion of phase margin. Therefore, the value of
the C
2
can be derived from
C
2
=
1
20
π
f
CO
R
1
Figure 2 illustrates the overall loop frequency
response and frequency of each pole and zero.
To fine-tune the compensation, it is necessary to
physically measure the frequency response us-
ing a network analyzer.
Gain
-20db/dec
-40db/dec
-20db/dec
-20db/dec
-20db/dec
Error Amplifier
Loop
f
f
f
Z1
f
P(LC)
f
Z(ESR)
f
CO
f
P1
Figure 2. Frequency response of a stable system and its
error amplifier.
D1
MBR0530
BST
SWN
V
CC
V
FB
COMP
GH
GL
GND
R1
5.0
RZ
20k
CB
2.2
μ
F
SP6123A
U1
CP
47pF
Q1
C
IN
47
μ
F Ceramic
R2
1.6V/4A
CBST
1
μ
F
L1
1
μ
H
C
OUT
4x47
μ
F Ceramic
R3
C1
330pF
D2
STPS2L25U
CZ
680pF
3V to 5.5V
Q1
1
2
3
4
8
7
6
5
Figure 3. SP6123 Buck converter design with ceramic output capacitors.
APPLICATIONS INFORMATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP6123A | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6123ACN | 制造商:Exar Corporation 功能描述:Swithed-Mode Power Supply Controller, Voltage Mode Type, 8 Pin, Plastic, SOP |
| SP6123ACN/TR | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:Low Voltage, Synchronous Step-Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6123ACN-L | 功能描述:電壓模式 PWM 控制器 Low Voltage, Micro 8 Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6123ACN-L/TR | 功能描述:電壓模式 PWM 控制器 Low Voltage, Micro 8 Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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