日韩视频在线精品视频免费观看-日韩视频在线观看中字-日韩视频在线观看一区-日韩视频在线观看免费-日韩视频在线观看-日韩视频在线播放

產(chǎn)品分類

當前位置: 首頁 > 工業(yè)電子產(chǎn)品 > 無源元器件 > MOSFET

類型分類:
科普知識
數(shù)據(jù)分類:
MOSFET

LED Drivers Integrate MOSFETs, Circuit Protection to Reduce Design Complexity

發(fā)布日期:2022-10-09 點擊率:46

       
One of the biggest challenges that engineers face is how to simplify their designs without sacrificing performance or functionality. For LED lighting, designers would do well to evaluate their LED driver options very closely. Many of these drivers integrate multiple components, including MOSFETs and circuit protection devices, as well as other features, enabling simpler designs.

In all cases of component integration, there are always tradeoffs, but which ones designers can live with is determined by each individual application. Two of the biggest concerns for LED driver integration include lack of flexibility and thermal issues.

In this article, we will look at a sample of AC/DC and DC/DC LED drivers that promise to ease design complexity, save space, and accelerate time to market. For example, many LED drivers for incandescent bulb replacement applications integrate 1- or 4-A MOSFETs, which not only simplify designs and reduce design time, but also save board space and cost by cutting the bill of materials (BOM) via eliminating the need for external components. These parts also meet system circuit protection requirements by integrating overtemperature protection, undervoltage lockout, thermal shutdown, and other protection features that improve system reliability. Lastly, these drivers speed up product launches by shrinking design and qualification cycles.

"When everything is integrated, it's very good for the mass market because it's very easy to design with and [the part] offers a very small form factor," said Jim Patterson, systems and applications manager, Lighting Power Products, Texas Instruments, Inc. "That combination makes time to market much quicker, because issues like EMI performance have already been well tested in the package."

Patterson also admits "retrofit lamps are a difficult market due to the size constraints,” adding that “you're taking a light bulb, such as a MR16 or GU10, in very small two-inch-diameter envelopes that have to fit all the electronics."

MOSFET integration

The primary reason why LED driver manufacturers integrate MOSFETs into their drivers is to help designers reduce board space. "Because you no longer need an external MOSFET, it increases the amount of PCB available for other features, or it reduces the board space to fit into smaller fixtures such as decorative lighting or lighting under cabinets," said Brian Johnson, LED lighting technical marketing manager for Fairchild Semiconductor.

Another big factor is cost. Eliminating the packaging and placement of the MOSFET on the board reduces overall cost, and the integrated device could eliminate other components including a resistor and diode combination, often used to adjust the turn on/ turn off time of the MOSFET. As an example, Fairchild Semiconductor's FLS0116, FLS3217, and FLS3247 drivers with integrated MOSFETs handle that function internally on the chip so it guarantees how fast that MOSFET turns on and off.

A related benefit is reliability. One less part translates into one less part to worry about failing in the driver circuit.

Fairchild Semiconductor's FLS0116, FLS3217, and FLS3247 also integrate power factor correction (PFC), targeting low-power LED applications, and protection features such as overtemperature protection and undervoltage lockout, which help to improve LED lamp system reliability.

The FLS0116 (Figure 1) with an integrated 1 A, 550 V MOSFET uses an "adopted digital" technique to achieve active PFC. The technique senses where the zero voltage is occurring and then synthesizes the voltage waveform in order to control the current and achieve good power factor (PF). It also automatically detects AC and DC input voltage conditions.

Other helpful features of the FLS0116 include a built-in high-voltage circuit for self-biasing, which means it derives the power directly from the high-voltage input, and programmable oscillation frequency. This allows the designer to adjust the frequency, which affects the size of the inductors required and how the EMI filter is designed.

Fairchild Semico<em></em>nductor FLS0116 LED driver

Figure 1: The Fairchild Semiconductor FLS0116 LED driver allows designers to program the operating frequency (RT) using an external resistor. Frequency influences the lighting circuit's EMI filter design and size of inductor. (Courtesy of Fairchild Semiconductor.)

The FLS3217 and FLS3247 (Figure 2) with primary-side regulation (PSR) are set for AC voltage input. The FLS3217 integrates a 1 A, 700 V MOSFET and the FLS3247 integrates a 4 A, 700 V MOSFET. Typical drivers with 1 A FETs are used in candelabra type applications, while drivers with 4 A FETs target some versions of the GU10, A19, PAR20 and MR16 bulbs. The FLS3217 and FLS3247 drivers eliminate the need for several external components, including an optoisolator, thanks to its TRUECURRENT PSR technology. The technology also allows for accurate constant-current control.

Fairchild Semico<em></em>nductor FLS3217/3247

Figure 2: The Fairchild Semiconductor FLS3217/3247 with integrated PFC and power MOSFET eliminates external components, including an optoisolator, thanks to Fairchild's TRUECURRENT primary side regulation technology. The technology also enables accurate constant current control. (Courtesy of Fairchild Semiconductor.)

The reason why accuracy is so important in LED lighting designs is that current is what determines the LED brightness. "If the accuracy is not tight, you will get variation in brightness from lamp to lamp," said Fairchild’s Johnson. "You may also note a shift in color from lamp to lamp. The accuracy is also a measure of how well line variation, temperature, or other circuit variation effects are rejected in the control of the output current."

Another product of note is ON Semiconductor's NCL30160 constant-current driver with an integrated 1 A, 50 mΩ MOSFET for high-power LEDs, targeting MR16 bulbs. A dedicated PWM input delivers a wide range of pulsed dimming and a high switching frequency up to 1.4 MHz, which allows for the use of smaller external components. Integrated protection features include resistor-programmed constant LED current, broken/open LED protection, undervoltage, and thermal shutdown.

Also targeting MR16 lamp replacements, as well as other 12 V, AC- or DC-input LED lighting applications, is the MAX16840 from Maxim Integrated, which includes a 0.2 Ω (max), 48 V switching MOSFET. What is unique about this product is that it uses a proprietary architecture to control the input current of the lamp for flicker-free, dimmable operation. The design also eliminates the need for electrolytic capacitors, which extend the lifetime of the LED lamp, since these capacitors are typically the first to fail in driver circuits, according to Maxim.

One of Texas Instruments' controller products with an integrated 3.75 Ω, 600 V power FET is the TPS92310 AC/DC constant driver with PFC. It targets LED retrofit bulbs including the A19, PAR30/38 and GU10. This offline converter is suitable for driving 8 W LED loads and below. It also includes protection features such as cycle-by-cycle primary side inductor current limit, VCC under-voltage lockout, output overvoltage protection, and thermal shutdown. TI evaluation boards also are available.

TI has taken integration to the next level with its LED driver micro modules, which eliminate several external components and simplify complex layouts. These modules incorporate all power and passive circuitry required for LED driver designs in a single 10 x 13 x 5 mm package, and can eliminate four or more components.

TI's 450 mA TPS92550 (Figure 3) and TPS92551 (Figure 4) micro modules integrate the entire switching converter in one package, eliminating the need for power supply design resources and simplifying procurement, according to TI. The only external parts required are an input capacitor and a resistor to set the current level. However, if the designer wants to keep the module set at the default current level of 350 mA, no resistor is required.

TI 14 watt TPS92550 DC/DC LED driver

Figure 3: The TI 14 watt TPS92550 DC/DC LED driver module requires no external current sensing elements. With a minimum configuration of 350 mA nominal current output, the LED driver only requires an input capacitor. It is adjustable from 350 mA to 450 mA using an external resistor. Additional capacitance at the output can be added to reduce LED current ripple. (Courtesy of Texas Instruments.)

TI 23-W TPS92551 DC/DC LED driver

Figure 4: The TI 23-W TPS92551 DC/DC LED driver module, at a minimum configuration of 350-mA nominal current output, only requires an input capacitor. If 450 mA is desired, only a single external resistor is needed. To reduce LED current ripple, additional capacitance can be added at the output. (Courtesy of Texas Instruments.)

As always, there are tradeoffs


Although all of these integrated LED drivers save space, reduce cost, and allow for use in smaller form factors, there are a couple of tradeoffs. One big one is thermal management. With the additional power on the controller due to the integration of the MOSFET, that heat is now being dissipated in the integrated package.

If the designer does not do a good enough job as far as thermal design, it could possibly raise the junction temperature of the IC and reduce the driver's reliability, explained Fairchild’s Johnson.

One of the key things is keeping the thermal junction temperature stable, according to LED driver manufacturers. Fairchild recommends putting as much "free space" as possible around the package in order to transfer some of that heat away from the package. The company also has "maximized the thermal transfer design in the package."

Be sure to look at the junction-to-case thermal resistance (θJC), which is a measure of how good the device is in handling temperature and is typically found on the datasheets. As an example, TI's micro modules have a θJC of 1.9°C/W, which translates into roughly a 2°C rise per watt of power in the device.

"Any time you integrate a power handling device, you have to worry about thermal issues," said Patterson of TI. "We have to make a package that can handle worst-case conditions. In conjunction, the assembly, the layout of the PCB, and entire fixture has to be taken into account."

Patterson recommends that designers use evaluation modules as a template for their layouts, along with other available design tools, including the company’s WEBENCH?.

Most LED driver manufacturers will work with designers to ensure that they are operating the FET within its current and voltage ratings. They also provide design tools and reference designs, making sure the board layout is optimized so it does not create a hotter device.

The other tradeoff is a lack of flexibility. If a designer selects a LED driver with either an integrated 1 A or 4 A MOSFET, that is the current rating for the MOSFET.

Patterson noted that if a designer is developing a platform driver design to cover a large array of power levels, then a fully integrated device might not be the right choice, especially if different switch FETs are required to optimize for efficiency and performance for each solution.

Summary

If a LED lighting designer's top priority is getting product to market faster, LED drivers with integrated MOSFETs and circuit protection are likely good choices to reduce time to market. These integrated devices reduce BOM count, offer a PCB space savings, and lower overall costs.

However, integration may not be practical in platform designs that call for the use of different MOSFETs. If a designer selects a LED driver with a 1 A MOSFET, there is no changing the current. Designers must pay special attention to thermal issues, as more heat is dissipated in the package with an integrated MOSFET.

下一篇: PLC、DCS、FCS三大控

上一篇: Upgrade IBA Boards w

推薦產(chǎn)品

更多
主站蜘蛛池模板: 亚洲图片中文字幕 | 国产成人精品日本亚洲网站 | 精品少妇一区二区三区日产乱码 | 亚洲欧美日韩国产精品b站在线看 | 欧美成人精品欧美一级乱黄 | 精品夜色国产国偷在线 | 国产精品主播视频 | 国产亚洲精品久久久久久大师 | 中文字幕免费高 | 自拍偷拍麻豆 | 天干天干天啪啪夜爽爽av小说 | 五月天激情婷婷婷久久 | 波多野结衣精品一区二区三区 | 国产男女猛烈无遮掩视频免费网站 | 99re国产精品视频 | 九一国产在线观看 | 伊人久久大香线蕉综合影院首页 | 久久综合给久久狠狠97色 | 国产69精品久久久久app下载 | 久久99国产精一区二区三区 | av网站在线免费 | 国产卡一卡二无线乱码 | 日产久久久久久 | 一二级毛片 | 亚洲天堂网在线观看 | 不卡的一区二区 | 国产精品一区二区羞羞答答 | 欧美亚洲国产一区二区三区 | 欧美a∨亚洲欧美亚洲 | 国产人妻精品一区二区三区 | 日韩精品无码一区二区三区 | 日本黄色性视频 | 国产又大又硬又粗无遮挡 | 免费看成人哺乳视频 | 亚洲一级免费在线观看 | 国产亚洲精久久久久久无码77777 | 在线天堂中文在线资源网 | 亚洲精品ww | 九七超碰在线 | 日韩a片无码毛片免费看 | 美女福利片| 成人自拍视频在线 | 国产一区二区三区久久 | 欧美一本乱大交性xxxⅹ | 亚洲国产日韩精品 | 欧美视频日韩 | 一本一本久久a久久精品综合小说 | 密臀av夜夜澡人人爽人人 | 少妇一级二级三级 | 日韩欧美国产成人 | 免费av在线网址 | 美女被张开双腿日出白浆 | 四虎永久在线精品免费一区二区 | 女同理伦片在线观看禁男之园 | 麻豆福利影院 | 亚洲最大av | 国产一级av毛片 | 最新亚洲人成无码网www电影 | 日韩精品国产一区 | 欧美高清hd | 成人久久久久爱 | 国产最爽乱淫视频免费 | 黄色一级大片免费看 | 国产精品国色综合久久 | 国产男女免费完整视频 | 91午夜少妇三级全黄 | 欧美一区二区在线免费观看 | jizz曰本jlzz18 | 91成人在线 | 久久久久久一区 | 在线aaa| 成人涩涩软件 | 日本高清在线观看视频 | 亚洲黄色三级视频 | 欧洲性开放大片 | 少妇献身老头系列 | 色在线视频观看 | 中文字幕无限2021 | 欧美性猛交性大交 | 美女久久久久久久久 | 国产精品9999久久久久仙踪林 | 日韩免费视频一区二区 | 特级毛片爽www免费版 | 免看黄大片aa | 久久久夜 | 久久午夜夜伦鲁鲁一区二区 | 中文字幕熟妇人妻在线视频 | 国产日韩在线一区 | 久久久久久av无码免费看大片 | 欧美日韩国产a | 狠狠色狠狠色综合网 | 极品美女白嫩呻吟湿淋淋照片 | 日日骚影院 | 亚洲一区无 | 欧日韩无套内射变态 | 一个色亚洲| 精彩视频一区二区三区 | 国产精品亚洲一区二区三区天天看 | 亚洲视频二区 | 亚洲欧美一区二区三区视频 | 久久99精品国产自在现线小黄鸭 | 国产成a人亚洲精v品在线观看 | 亚洲国产高清视频 | 国产黄色大片免费看 | 国产麻豆剧果冻传媒白晶晶 | 久热国产在线 | 中文字幕国产综合 | 欧美在线观看a | a天堂视频在线观看 | 69a∨色欧美丰满少妇 | 欧美香蕉在线 | 淫人网| 欧美天天色 | 大肉大捧一进一出好爽mba | 日本一卡二卡视频 | 久久久久久欧美精品色一二三四 | 欧美国产另类 | 久久人人爽人人爽人人片av高请 | 国产理论精品 | 国产乱子伦视频在线播放 | 麻豆三级在线观看 | 中文字幕亚洲天堂 | 久久精品免费看 | av美女在线观看 | 国产视频123 | 亚洲免费视频一区 | 久久国产精品视频 | 在线观看日韩欧美 | 91九色丨porny丨朋友 | 日韩天堂视频 | 国产日产精品一区二区 | 在线看片中文字幕 | 国产美女作爱视频 | 老司机成人免费视频 | 成人性生生活性生交视频 | 亚洲色图欧美激情 | 麻豆精品久久久 | 色婷在线| 久久亚洲中文字幕精品一区 | 日韩欧美网站 | 50部乳奶水在线播放 | 两口子交换真实刺激高潮 | 爱情岛论坛av | 熟妇人妻不卡中文字幕 | 韩国三级大全久久网站 | 久久精品99国产精品 | 国产九九九九 | 亚洲日韩一页精品发布 | 我要看黄色1级片 | 性生交大片免费全毛片 | 亚洲人网| 好吊操视频 | 91插插影库| 九草在线 | 欧美xxx视频| 中文字幕一区二区三区手机版 | 国产福利91精品一区二区三区 | 97人人草| 亚洲自拍激情 | 一本到免费视频 | 久久五 | 久久久婷婷五月亚洲97号色 | 少妇中文字幕 | 亚洲欧美午夜 | 网站在线免费网站在线免费观看国产网页 | 99精品人妻少妇一区二区 | 国产精品精品久久久久久甜蜜软件 | 91精品国产二区在线看大桥未久 | 欧美日韩免费做爰视频 | 久久国内精品自在自线 | 久久青青草原国产毛片 | 丰满少妇高潮在线播放不卡 | 日韩成人影视 | 亚洲精品国产摄像头 | 午夜色大片在线观看 | 九色一区 | 欧美xxxx做受欧美1314 | 国产激情综合在线观看 | 国产又黄又猛的视频 | 久久频这里精品99香蕉 | 亚洲第一页综合图片自拍 | 国产又色又爽又高潮免费 | 亚洲精品女 | 国产精品久久一区 | 青青青在线视频人视频在线 | 做爰aa女r高潮| 无码人妻一区二区三区精品视频 | 日韩成人高清视频 | 成人精品在线 | 日日躁夜夜躁狠狠躁超爽2001 | 又大又长粗又爽又黄少妇视频 | 日本疯狂爆乳xxxx | 天堂www中文在线资源 | 亚洲色图清纯唯美 | 国产日产亚洲精品 | 国产色啪 | 98在线视频 | 成人免费黄色网址 | 日日摸夜夜添夜夜爽免费视频 | 黄色片网站免费看 | 日韩女女同性aa女同 | www黄av| 91九色网| 俺也去综合 | 亚洲春色成人 | 精品国产av无码一区二区三区 | 福利在线视频观看 | av不卡在线播放 | 日产精品久久久一区二区 | 在线天堂在线 | 国产精品人妻在线观看 | 日本在线视频www | 少妇下蹲下露大唇58 | 久久久区 | 久久精品国产中国久久 | 午夜免费视频观看 | 欧美亚洲一区二区三区 | gogo精品国模啪啪作爱 | 日本捏奶吃奶的视频 | 日韩美女视频一区二区 | 日本伊人精品一区二区三区 | 久久久6 | 无码人妻一区二区三区在线视频 | 中日韩中文字幕区 | 久久久精品人妻久久影视 | 18禁无遮挡羞羞污污污污网站 | 中国一级特黄真人毛片 | 久久99视频| 国产成人片无码视频在线观看 | 啪啪网免费| 国产又黄又大又粗的视频 | 萌白酱国产一区二区 | 黑人一级| 成人免费无码大片a毛片抽搐 | 国产欧亚州美日韩综合区 | 精品国产亚洲一区二区三区 | 天堂中文视频在线 | 狠狠色综合色综合网站久久 | 久久久久亚洲国产av麻豆 | 日韩一区高清 | 国产黑丝在线视频 | 人人妻人人澡人人爽人人精品浪潮 | 久久久久久久国产 | 最新在线黄色网址 | 饥渴的熟妇张开腿呻吟视频 | 91丝袜超薄交口足 | 国产第七页| 日韩欧美精品一区 | 69av视频在线观看 | 国产成人精品a视频一区 | 激情另类视频 | 天天躁日日躁狠狠躁av中文 | 6080私人午夜性爽快影院 | 国产成人亚洲精品自产在线 | 久久久久综合网 | 亚洲免费色图 | 国产精品色婷婷久久99精品 | 日本边添边摸边做边爱喷水 | 精品久久久久久综合日本 | ktv偷拍视频一区二区 | 亚洲欧洲色图 | 中文字幕亚洲欧美日韩在线不卡 | 色婷婷在线视频 | 国产同性野外打野战 | 亚洲色图激情小说 | 一性一交一口添一摸视频 | 精品无码成人久久久久久 | 亚洲精品一区国产精品 | 成人综合激情 | 狠狠干天天操 | 欧美一级在线观看 | 人人爱超碰 | 在线色导航 | 成人在线网站 | 无码中文字幕人妻在线一区二区三区 | 羞羞影院午夜男女爽爽 | 黄瓜视频在线观看污 | 九九九热精品免费视频观看网站 | 国产亚洲精品久久久久久网站 | 在线观看国产精品视频 | 国产精品8 | 亚洲最大综合网 | 先锋久久| 欧美成人vr18sexvr | 麻豆乱淫一区二区三区 | 国产精品国产成人国产三级 | 插我舔内射18免费视频 | 丰满少妇作爱视频免费观看 | 日本免费一区二区三区四区五六区 | 欧洲精品码一区二区三区免费看 | 精品无码中文视频在线观看 | 影音先锋中文字幕在线 | 亚洲人成网站精品片在线观看 | 天天鲁一鲁摸一摸爽一爽 | 超碰精品在线观看 | 加勒比一区二区三区 | 日本中文字幕网站 | 毛片黄色视频 | 在线永久免费观看黄网站视频 | 国产成人精品无码免费看 | 亚洲乱人伦 | 色8久久人人97超碰香蕉987 | 91久久久久久 | 在线观看一区二区三区av | 直接在线观看的三级网址 | 色婷婷国产精品久久包臀 | 国产在线永久视频 | 一级黄色短视频 | 免费亚洲一区 | 国产精品v欧美精品 | 国产成人免费高清激情视频 | 九色porny丨国产首页在线 | 精品伦一区二区三区免费视频 | 美日韩在线视频 | 欧美一级淫片007 | 国产伦视频 | 国产毛片91 | 久草aⅴ | 国产偷倩视频 | 日p视频在线观看 | 国产欧美一区二区视频 | 波多野结衣在线网址 | 欧洲成人在线视频 | 色婷婷欧美在线播放内射 | 一卡二卡精品 | 日韩字幕 | 成人免费视频xbxb入口 | 免费裸体无遮挡黄网站免费看 | 国产对白叫床清晰在线播放图片 | 欧产日产国产精品精品 | 夜夜躁狠狠躁日日躁2020 | 国产目拍亚洲精品99久久精品 | 欧美a天堂| 免费观看成人羞羞视频网站观看 | 亚洲午夜影视 | 中文字幕av日韩精品一区二区 | 国产精品178页| 91精品国产乱码久久久竹菊 | 欧美性受xxx | 91九色在线播放 | 性色蜜桃臀x66av | 久久久久成人免费看a含羞草久色 | 色一情一交一乱一区二区 | 亚洲图片在线播放 | 成人精品一区二区三区在线观看 | 欧美大屁股熟妇bbbbbb | 无码丰满少妇2在线观看 | 国产又粗又黄又长又爽动漫 | 思热99re视热频这里只精品 | 日本三级排行榜 | 免费看日批视频 | 国产乱码精品一区二三赶尸艳谈 | 神马一区二区三区 | 一区二区在线播放视频 | 久久久久久一区国产精品 | 久久精品国产色蜜蜜麻豆 | 欧美一区二区三区激情 | 香蕉综合视频 | 亚洲日本综合 | 嫩草亚洲 | 亚洲国产成人va在线观看天堂 | 在线黄色av| 天天影视色香欲综合久久 | 一本色道久久综合无码人妻 | 热久久精品免费视频 | 久久综合亚洲鲁鲁五月久久 | 欧美精品在线一区二区 | 天堂国产一区二区三区四区不卡 | 亚洲国产精品成人综合久久久久久久 | 国产精品久久久久久久久久精爆 | 国产成人无码a区在线视频无码dvd | 奇米影视7777久久精品 | 色婷婷亚洲综合 | 青青草青娱乐 | 青青青手机频在线观看 | 欧美性生交xxxxxdddd | 中文字幕日产av | 亚洲一区二区三区无码国产 | aaa毛片视频 | 女人与拘做受全过程免费视频 | 久久精品中文騷妇女内射 | www.欧美亚洲 | 在线看中文字幕 | 国产情侣自拍小视频 | 亚洲香蕉久久 | 男人亚洲天堂 | 在线观看网址你懂的 | 国产传媒视频在线 | 欧美精品99久久久久久人 | 国产亚洲精品久久久久久牛牛 | 欧美污视频在线观看 | 呦一呦二在线精品视频 | 欧美xxxx做受性欧美88 | av看片网站| 国产精品第一页在线观看 | www视频一区| 日本中文亲子偷伦 | 97精品在线 | 久久久精品波多野结衣av | 超碰997| 白峰美羽在线播放 | 成人免费看片39在线 | 亚洲涩涩爱 | 婷婷四房综合激情五月 | 久久久免费在线观看 | 国产美女高潮一区二区三区 | 亚洲男人av | 天天干天天色综合网 | 天堂√最新版中文在线地址 | 在线观看国产精品普通话对白精品 | 成人做爰69片免费看 | 亚洲香蕉网站 | 久久婷婷亚洲 | 欧美另类videosbestsex日本 | 黄色xxx| 在线观看国产精品视频 | 欧美精品v国产精品 | 亚洲精品乱码久久久久久蜜桃不爽 | 欧美国产视频 | 九九热视频免费 | 婷婷天天| 97精品伊人久久久大香线蕉97如何观看 | 人与性动交aaaabbbb视频 | 伊人精品成人久久综合软件 | 亚洲影院av | 久久爱综合 | 日本黄色性视频 | 蜜桃狠狠色伊人亚洲综合网站 | 成人h在线 | 337p粉嫩大胆噜噜噜 | 男女做爰猛烈啪啪吃奶动床戏麻豆 | 极品粉嫩国产18尤物 | 国内精品久久毛片一区二区 | 欧美在线观看不卡 | 久久99国产精品视频 | 中文字幕乱码亚洲精品一区 | 国产人妖cd在线看网站 | 少妇高潮太爽了在线视频 | 在教室伦流澡到高潮hnp视频 | 伊人中文字幕在线 | 韩日午夜在线资源一区二区 | 少妇浴室愉情韩国理论 | 成人午夜激情视频 | 久久精品香蕉 | 欧美粗暴se喷水 | 亚欧洲精品在线视频免费观看 | 一卡二卡三卡视频 | 国产乱国产乱老熟300部视频 | 日韩亚洲欧美精品综合 | 中国三级毛片 | 亚洲欧美自偷自拍 | 女人和拘做爰正片视频 | 免费一级做a爰片久久毛片潮 | 国产精品专区在线观看 | 成年人黄色一级片 | 日本少妇全身按摩做爰5 | 三级慰安女妇威狂放播 | 婷婷色婷婷开心五月四房播播 | 亚洲国产一区二区三区四区四季 | 色拍拍欧美视频在线看 | 日本大奶少妇 | 丰满婷婷久久香蕉亚洲新区 | 亚洲精品萌白酱一区 | 国产日韩欧美综合在线 | 成人福利在线观看 | 最近日韩免费视频 | 女人爽到高潮的免费视频 | 黄色一级大片在线免费看国产一 | 日韩黄色在线观看 | 奴性白洁会所调教 | 特a级黄色片 | 深夜视频一区二区 | 日韩精品色哟哟 | 国产原创中文av | www.夜色321.com | 成人在线小视频 | 成人性视频在线 | 91成人在线观看喷潮 | 凹凸成人精品亚洲精品密奴 | av专区在线观看 | 成人小视频在线 | 久久天天躁狠狠躁夜夜不卡 | 亚州av综合色区无码一区 | 日韩久久精品一区二区 | 九九热免费观看 | 亚洲欧美在线免费观看 | 夜夜揉揉日日人人 | 日韩欧美在线播放 | 嘿咻视频在线观看 | 成人无码精品一区二区三区 | 国产一区二区福利 | 中文字幕日韩视频 | 国产口语对白老妇 | 性高朝久久久久久久 | 97超碰中文 | 欧美91精品久久久久国产性生爱 | 日本500人裸体仓房视频 | 天堂无人区乱码一区二区三区介绍 | 欧美激情乱人伦 | 国产精品一区二区 尿失禁 又污又爽又黄的网站 | 国产一级视频 | 天天射寡妇射 | 久久综合狠狠综合久久综合88 | 亚洲欧美综合区丁香五月小说 | 色综合中文字幕 | 丰满肥臀大屁股熟妇激情视频 | 日韩精品视频中文字幕 | 天堂在线免费观看视频 | 日韩黄色免费视频 | 中国大陆一级毛片 | 成在人线av无码免观看麻豆 | 国产av一区最新精品 | 亚洲处破女av日韩精品 | 中文字幕亚洲欧美日韩在线不卡 | 国产96在线 | 欧美 | 荷兰av| 后进极品白嫩翘臀在线视频 | 人妻无码久久一区二区三区免费 | 国产精品久久久久国产a级 国产精品久久久久国产三级传媒 | 久久国产精品99久久久久久丝袜 | 玩成熟老熟女视频 | 国产午夜福利在线机视频 | 色婷婷在线观看视频 | 另类小说亚洲色图 | 噼里啪啦大全免费观看 | 国产精品美女视频 | 国产乱码精品一区二区蜜臀 | 干片网在线观看 | 国产乱xxxxx79国语对白 | 久久精品水蜜桃av综合天堂 | 一级a性色生活片久久毛片明星 | 色婷婷久久久亚洲一区二区三区 | 九九热这里有精品 | 色偷偷亚洲男人的天堂 | 久久精品一区二区视频 | 亚洲精品乱码久久久久久日本蜜臀 | 搡老岳熟女国产熟妇 | 欧美亚洲日本国产 | xxx久久 | 狠狠综合久久av一区二区 | 日韩女优在线播放 | 色屁屁www影院免费观看入口 | 久久久久久69 | 一区二区三区精彩视频 | 欧美中字 | 香蕉久久久久久 | youjizz韩国| 久色视频在线 | 九九九九九九精品 | 精品毛片乱码1区2区3区 | 日韩不卡高清视频 | 97国产在线播放 | 日韩精品毛片无码一区到三区 | 人与善性猛交xxxx视频 | 国产最露的三级 | 亚洲欧美精品 | 国产美女av| 五月色婷 | 欧洲精品在线观看 | 国产中文在线 | 波多野结衣不打码视频 | 久久久久无码国产精品一区 | 亚洲精品成人悠悠色影视 | 男女啪啪猛烈无遮挡猛进猛出 | 91尤物国产福利在线观看 | 99久热在线精品视频成人一区 | 蜜桃av一区 | 69a∨色欧美丰满少妇 | 黄视频在线播放 | 国内精品一区二区三区不卡 | 欧美另类高清 | 亚洲男人网 | 国产69精品久久久久777糖心 | 乳霸冲田杏梨中文字幕担心学生的 | 国产成人精品日本亚洲专区61 | 亚洲高清福利 | 久久国产加勒比精品无码 | 成人免费国产 | 成年视频免费高清在线看 | 欧美午夜理伦三级在线观看吃奶汁 | av女优天堂在线观看 | 国产精品美女乱子伦高 | 九九色在线| 国产一区二区四区 | 国产在线国偷精品产拍免费yy | 国产美女极度色诱视频www | 国产毛片欧美毛片久久久 | 日日碰日日操 | 日本中文字幕免费观看 | 国产日产精品一区二区三区四区的观看方式 | 亚洲另类交 | 国产欧美一区二区三区另类精品 | av亚洲在线观看 | 91精品国产综合久久小美女 | 日本三级韩国三级欧美三级 | 免费国产又色又爽又黄的软件 | 亚洲成人精选 | 国产女女做受ⅹxx高潮 | 污网站在线免费看 | 日韩小视频在线 | 九九精品免费视频 | 久久最新精品 | 少妇裸体啪啪激情高潮 | 婷婷综合基地俺也来 | 欧美色aⅴ欧美综合色 | 男人猛躁女人网站 | 国产精品theporn| 91丝袜国产在线播放 | 精品无码国产污污污免费 | 激情欧美亚洲 | 免费人成网站在线视频 | 中文在线资源 | 欧美熟妇另类久久久久久不卡 | 天天躁日日躁狠狠躁一区 | 成人欧美视频在线观看 |