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參數(shù)資料
| 型號(hào)： | LT3686IDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 509K |
| 代理商： | LT3686IDD#TRPBF |
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LT3686
22
3686fc
ApplicAtions inForMAtion
Figure 16. Model for Loop Response
Frequency Compensation
The LT3686 uses current mode control to regulate the
output. This simplifies loop compensation. In particular,
the LT3686 does not require the ESR of the output capaci-
tor for stability allowing the use of ceramic capacitors to
achieve low output ripple and small circuit size. Figure 16
shows an equivalent circuit for the LT3686 control loop.
The error amp is a transconductance amplifier with finite
output impedance. The power section, consisting of the
modulator, power switch and inductor, is modeled as a
transconductance amplifier generating an output current
proportional to the voltage at the VC node. Note that the
outputcapacitorintegratesthiscurrent,andthatthecapaci-
torontheVCnode(CC)integratestheerroramplifieroutput
current, resulting in two poles in the loop. RC provides a
zero. With the recommended output capacitor, the loop
crossover occurs above the RCCC zero. This simple model
works well as long as the value of the inductor is not too
high and the loop crossover frequency is much lower than
the switching frequency. With a larger ceramic capacitor
(very low ESR), crossover may be lower and a phase lead
capacitor (CPL) across the feedback divider may improve
thephasemarginandtransientresponse.Largeelectrolytic
capacitors may have an ESR large enough to create an
additional zero, and the phase lead may not be necessary.
If the output capacitor is different than the recommended
capacitor, stability should be checked across all operating
conditions, including load current, input voltage and tem-
perature. The LT1375 data sheet contains a more thorough
discussion of loop compensation and describes how to
test the stability using a transient load.
800mV
SW
FB
R1
CPL
R2
ERROR
AMPLIFIER
CURRENT MODE
POWER STAGE
GND
LT3686
1V
1M
RC
160k
VC
CC
100pF
–
+
–
+
gm =
200A/V
gm =
2A/V
ESR
3686 F16
OUT
C1
+
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| LT3688 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual 800mA Step-Down Switching Regulator with Power-On Reset |
| LT3688EFE#PBF | 功能描述:IC REG BUCK ADJ 0.8A DL 24TSSOP 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:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 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:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
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