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參數(shù)資料
| 型號： | LT3581EMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大?。?/td> | 498K |
| 代理商： | LT3581EMSE#PBF |
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LT3581
3581f
VOUT
AC-COUPLED
500mV/DIV
IL
1A/DIV
3581 F15a
50s/DIV
VOUT
AC-COUPLED
500mV/DIV
IL
1A/DIV
3581 F15b
50s/DIV
appenDix
found. Figures 15a to 15c illustrate this process for the
circuit of Figure 18 with a load current stepped between
540mA and 800mA. Figure 15a shows the transient re-
sponse with RC equal to 1k. The phase margin is poor as
evidenced by the excessive ringing in the output voltage
and inductor current. In Figure 15b, the value of RC is
increasedto3k,whichresultsinamoredampedresponse.
Figure 15c shows the results when RC is increased further
to 10.5k. The transient response is nicely damped and the
compensation procedure is complete.
Figure 15a. Transient Response Shows Excessive Ringing
Figure 15b. Transient Response is Better
Figure 15c. Transient Response is Well Damped
VOUT
AC-COUPLED
500mV/DIV
IL
1A/DIV
3581 F15c
50s/DIV
COMPENSATION – THEORY
Likeallothercurrentmodeswitchingregulators,theLT3581
needs to be compensated for stable and efficient operation.
Two feedback loops are used in the LT3581: a fast current
loop which does not require compensation, and a slower
voltageloopwhichdoes.StandardBodeplotanalysiscanbe
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 16 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have been replaced by a combination of the equivalent
transconductanceamplifiergmpandthecurrentcontrolled
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 80%.
Note that the maximum output currents of the gmp and
gma stages are finite. The output of the gmp stage is
limited by the minimum switch current limit (see Electrical
Specifications)andtheoutputofthegmastageisnominally
limited to about ±12μA.
1.215V
REFERENCE
IVIN
VIN
VOUT
IVIN
VOUT
COUT
CPL
RESR
RL
RO
VC
RC
CC
CF
R1
FB
R2
–
+
–
+
3581 F16
gmp
gma
CC: COMPENSATION CAPACITOR
COUT: OUTPUT CAPACITOR
CPL: PHASE LEAD CAPACITOR
CF: HIGH FREQUENCY FILTER CAPACITOR
gma: TRANSCONDUCTOR AMPLIFIER INSIDE IC
gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER
RC: COMPENSATION RESISTOR
RL: OUTPUT RESISTANCE DEFINED AS VOUT/ILOAD(MAX)
RO: OUTPUT RESISTANCE OF gma
R1, R2; FEEDBACK RESISTOR DIVIDER NETWORK
RESR: OUTPUT CAPACITOR ESR
Figure 16. Boost Converter Equivalent Model
相關PDF資料 |
PDF描述 |
|---|---|
| LT3581EMSE#TRPBF | SWITCHING REGULATOR, PDSO16 |
| LT3581IDE#TRPBF | SWITCHING REGULATOR, PDSO14 |
| LT3581IMSE#TRPBF | SWITCHING REGULATOR, PDSO16 |
| LT3581IMSE#PBF | SWITCHING REGULATOR, PDSO16 |
| LT3581IDE#PBF | SWITCHING REGULATOR, PDSO14 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT3581EMSE-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 |
| LT3581HDE#PBF | 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ 14DFN |
| LT3581HDE#TRPBF | 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ 14DFN |
| LT3581IDE#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:- 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) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LT3581IDE#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:- 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) 供應商設備封裝:10-MSOP 裸露焊盤 |
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