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參數(shù)資料
| 型號(hào)： | LT3682EDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO12 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 253K |
| 代理商： | LT3682EDD#TRPBF |
LT3682
16
3682f
APPLICATIONS INFORMATION
Figure 2. Model for Loop Response
0.8V
LT3682
CF
RC
VC
3Meg
3682 F02
CURRENT MODE
POWER STAGE
gm = 1.25S
CC
CPL
C1
R2
R1
SW
FB
GND
OUTPUT
CERAMIC
POLYMER
OR
TANTALUM
OR
ELECTROLITIC
ESR
+
C1
–
+
gm = 420μS
Table 3. Schottky Diodes
PART NUMBER
VR (V)
IAVE (A)
VF at 1A (mV) VF at 2A (mV)
On Semiconducor
MBR0520L
20
0.5
MBR0540
40
0.5
620
MBRM120E
20
1
530
595
MBRM140
40
1
550
Diodes Inc.
B0530W
30
0.5
B0540W
40
0.5
620
B120
20
1
500
B130
30
1
500
B140
40
1
500
B150
50
1
700
B220
20
2
500
B230
30
2
500
B140HB
40
1
DFLS240L
40
2
500
DFLS140
40
1.1
510
B240
40
2
500
Central Semiconductor
CMSH1 – 40M
40
1
500
CMSH1 – 60M
60
1
700
CMSH1 – 40ML
40
1
400
CMSH2 – 40M
40
2
550
CMSH2 – 60M
60
2
700
CMSH2 – 40L
40
2
400
CMSH2 – 40
40
2
500
CMSH2 – 60
60
2
700
Frequency Compensation
The LT3682 uses current mode control to regulate the
output. This simplies loop compensation. In particular,
the LT3682 does not require the ESR of the output capacitor
for stability, so you are free to use ceramic capacitors to
achieve low output ripple and small circuit size. Frequency
Loop compensation determines the stability and transient
performance. Optimizing the design of the compensation
network depends on the application and type of output
capacitor. A practical approach is to start with one of the
circuits in this data sheet that is similar to your application
and tune the compensation network to optimize the
performance. Stability should then be checked across all
operating conditions, including load current, input voltage
and temperature. The LT1375 data sheet contains a more
thorough discussion of loop compensation and describes
how to test the stability using a transient load. Figure 2
shows an equivalent circuit for the LT3682 control loop.
The error amplier is a transconductance amplier with
nite output impedance. The power section, consisting
of the modulator, power switch and inductor, is modeled
as a transconductance amplier generating an output
current proportional to the voltage at the VC pin. Note that
the output capacitor integrates this current, and that the
compensation is provided by the components tied to the VC
pin, as shown in Figure 2. Generally a capacitor (CC) and a
resistor (RC) in series to ground are used. In addition, there
may be a lower value capacitor in parallel. This capacitor
(CF) is used to lter noise at the switching frequency, and
is required only if a phase-lead capacitor (CPL) is used or
if the output capacitor has high ESR.
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| LT3682IDD#PBF | 功能描述:IC REG BUCK ADJ 1A 12DFN 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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| LT3682IDD#TRPBF | 功能描述:IC REG BUCK ADJ 1A 12DFN 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(biāo)準(zhǔn)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 |
| LT3682IDD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
| LT3682IDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A Micropower Step-Down |
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