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參數(shù)資料
| 型號： | LT3956IUHE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC36 |
| 封裝： | 5 X 6 MM, LEAD FREE, PLASTIC, QFN-36 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 1424K |
| 代理商： | LT3956IUHE#TRPBF |
LT3956
3956f
Loop Compensation
TheLT3956usesaninternaltransconductanceerrorampli-
fier whose VC output compensates the control loop. The
external inductor, output capacitor and the compensation
resistor and capacitor determine the loop stability.
The inductor and output capacitor are chosen based on
performance, size and cost. The compensation resistor
and capacitor at VC are selected to optimize control loop
responseandstability.FortypicalLEDapplications,a4.7nF
compensation capacitor at VC is adequate, and a series re-
sistor should always be used to increase the slew rate on
the VCpintomaintaintighterregulationofLEDcurrentdur-
ing fast transients on the input supply to the converter.
Board Layout
The high speed operation of the LT3956 demands careful
attention to board layout and component placement. The
exposed pads of the package are important for thermal
managementoftheIC.Itiscrucialtoachieveagoodelectri-
calandthermalcontactbetweentheGNDexposedpadand
the ground plane of the board. To reduce electromagnetic
interference (EMI), it is important to minimize the area of
the high dV/dt switching node between the inductor, SW
pin and anode of the Schottky rectifier. Use a ground plane
under the switching node to eliminate interplane coupling
to sensitive signals. The lengths of the high dI/dt traces:
1) from the switch node through the switch to PGND, and
2) from the switch node through the Schottky rectifier and
filter capacitor to PGND, should be minimized. The ground
points of these two switching current traces should come
to a common point then connect to the ground plane at the
PGND pin of the LT3956 through a separate via to Pin 12,
as shown in the suggested layout (Figure 5). Likewise, the
ground terminal of the bypass capacitor for the INTVCC
regulator should be placed near the GND of the IC. The
groundforthecompensationnetworkandotherDCcontrol
signals should be star connected to the GND Exposed Pad
of the IC. Do not extensively route high impedance signals
such as FB and VC, as they may pick up switching noise.
Since there is a small variable DC input bias current to
the ISN and ISP inputs, resistance in series with these
pins should be minimized to avoid creating an offset in
the current sense threshold.
applicaTions inForMaTion
Figure 5. Boost Converter Suggested Layout
3
VIA FROM LED+
LED–
LED+
3956 F05
LT3956
GND
SW
VMODE
PWM
CTRL
CVCC
VIAS TO GND PLANE
VIAS TO SW PLANE
VIAS FROM
PGND
VIAS
RT
CSS
VOUT
VIA
LED+
VIA
VIA FROM VOUT
RC
CC
VIN
CVIN
PGND
L1
R1 R2
R3
R4
M1
COUT
D1
1
2
12 13 14 15 16 17
36 35 34 33 32 31 30
21
23
24
25
27
28
8
6
4
3
2
1
20
9
10
VIN
RS
相關(guān)PDF資料 |
PDF描述 |
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| LT3957EUHE#TRPBF | SWITCHING REGULATOR, PQCC36 |
| LT3957IUHE#PBF | SWITCHING REGULATOR, PQCC36 |
| LT3958IUHE#PBF | SWITCHING REGULATOR, PQCC36 |
| LT3958EUHE#PBF | SWITCHING REGULATOR, PQCC36 |
| LT3958EUHE#TRPBF | SWITCHING REGULATOR, PQCC36 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3957 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Input Voltage Range |
| LT3957A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Converter |
| LT3957AEUHE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 5A 36QFN 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: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 |
| LT3957AEUHE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 5A 36QFN 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 |
| LT3957AIUHE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 5A 36QFN 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: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 |
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