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參數(shù)資料
| 型號： | LT3580MPMS8E#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 3/28頁 |
| 文件大?。?/td> | 289K |
| 代理商： | LT3580MPMS8E#PBF |
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LT3580
11
3580fg
APPLICATIONS INFORMATION
Compensation—Theory
Like all other current mode switching regulators, the
LT3580 needs to be compensated for stable and efficient
operation. Two feedback loops are used in the LT3580—
a fast current loop which does not require compensation,
and a slower voltage loop which does. Standard bode plot
analysis can be used to understand and adjust the voltage
feedback loop.
As with any feedback loop, identifying the gain and phase
contribution of the various elements in the loop is critical.
Figure 4 shows the key equivalent elements of a boost
converter. Because of the fast current control loop, the
power stage of the IC, inductor and diode have been replaced
by a combination of the equivalent transconductance
amplifier gmp and the current controlled current source
(which converts IVIN to ηVIN/VOUT IVIN). gmp acts as
a current source where the peak input current, IVIN, is
proportional to the VC voltage.
η is the efficiency of the
switching regulator, and is typically about 88%.
Note that the maximum output currents of gmp and gma are
finite. The limits for gmp are in the Electrical Characteristics
section (switch current limit), and gma is nominally limited
to about ±12μA.
From Figure 4, the DC gain, poles and zeros can be cal-
culated as follows:
Output Pole: P1
=
2
π RL COUT
Error Amp Pole: P2
=
1
2
π R
O + RC
CC
Error Amp Zero: Z1
=
1
2
π R
C CC
DC Gain:
(Breaking Loop at FB Pin)
ADC = AOL(0) =
V
C
VFB
IVIN
V
C
V
OUT
IVIN
VFB
V
OUT
=
gma R0
(
)g
mp η
VIN
VOUT
RL
2
0.5R2
R1
+ 0.5R2
ESR Zero: Z2
=
1
2
π R
ESR COUT
RHP Zero: Z3
=
VIN
2 R
L
2
π V
OUT
2 L
High Frequency Pole: P3
>
fS
3
Phase Lead Zero: Z4
=
1
2
π R1CPL
Phase Lead Pole: P4
=
1
2
π
R1
R2
2
R1
+
R2
2
CPL
Error Amp Filter Pole:
P5 =
1
2
π
RC RO
RC+RO
CF
,CF <
CC
10
The current mode zero (Z3) is a right-half plane zero
which can be an issue in feedback control design, but is
manageable with proper external component selection.
Figure 4. Boost Converter Equivalent Model
–
+
–
+
gma
RC
RO
R2
CC: COMPENSATION CAPACITOR
COUT: OUTPUT CAPACITOR
CPL: PHASE LEAD CAPACITOR
CF: HIGH FREQUENCY FILTER CAPACITOR
gma: TRANSCONDUCTANCE AMPLIFIER INSIDE IC
gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER
RC: COMPENSATION RESISTOR
RL: OUTPUT RESISTANCE DEFINED AS VOUT DIVIDED BY ILOAD(MAX)
RO: OUTPUT RESISTANCE OF gma
R1, R2: FEEDBACK RESISTOR DIVIDER NETWORK
RESR: OUTPUT CAPACITOR ESR
3580 F04
R1
FB
COUT
CPL
RL
RESR
VOUT
IVIN
VC
CC
CF
gmp
1.215V
REFERENCE
VIN
V
OUT
IVIN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3581 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3581EDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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| LT3581EDE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
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