| NXP TEA176x同步整流控制方案 |
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| 作者：未知 来源：NXP 点击数：124 更新时间：2008-5-16 |
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NXP公司的TEA1761/TEA1762是新型GreenChip的同步整流控制器解决方案.它采用SOI工艺技术制造,驱动器的输出电压高达10V,和所有的MOSFET兼容,工作电压从8.5V 到38 V,集成了初级控制和风细雨反馈功能,具有精密的内部基准电压源和保护特性,主要用于各种开关电源适配器,充电器和LCD TV.本文介绍了TEA1761/TEA1762主要特性和优势,方框图,应用电路以及应用案例和所用的元件清单(BOM).
New GreenChip Synchronous Rectification controller solutions TEA1761 / TEA1762
The TEA1762 is highly integrated including extra protection including a latch input and accurate 2.5 V reference output. It also offers improved voltage control capability, and an additional optocoupler drive gives it greater flexibility. All this is delivered in the compact SO14 package, helping keep your designs as simple as possible.
The second is highly competitive on price and performance. Housed in the SO8 package,
the TEA1761 delivers similar performance and easier system design benefi ts, while being
competitive compared to discrete solutions.
Fabricated in our advanced SOI (Silicon On Insulator) process, all our latest generation GreenChip ICs are robust performers and accept a wide voltage range. The high integration level and built in green functions of our new GreenChip devices lead to improved effi ciency at all power levels and help keep SMPS costs down. Ideal for synchronous rectifi cation on the secondary side of discontinuous conduction mode and quasi resonant fl yback converters, they provide you with a proven solution that helps simplify design.
关键特性:
Strong drive capability
High driver output voltage (10 V) compatible with all MOSFETs
Discriminates between primary stroke and ringing at low mains
Wide Vcc range (8.5 V to 38 V)
Accurate internal voltage reference
Integrated primary side control /feedback function
On-chip protection features including OTP and UVLO
关键优势:
Very simple design
Minimizes board space
Low external component count
Low current consumption
No auxilliary winding needed for supply
主要应用:
Adapters
Chargers
LCD TV
图1. TEA1761方框图
图2. TEA1762方框图
图3. TEA1761应用电路图
图4. TEA1762应用电路图
图5.90W适配器的TEA1761应用案例
表1.材料清单(BOM)
Relevant component values for a 19.5 V / 4.62 A application with the TEA1761.
详情请见:
http://www.nxp.com/acrobat_download/literature/9397/75015892.pdf
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