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| NXQ1TXA5 5W智能手机无线充电解决方案 |
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| 文章来源： 更新时间：2015/5/20 13:58:00 |
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NXP公司的NXQ1TXA5是无线充电发送器,集成了功率控制,信号处理,片上电流和电压测量等功能,待机功耗小于10mW,符合Qi标准V1.1.2.除了Qi线圈和谐振电容,所需外接元件不到10个,PCB面积小于2平方厘米.主要用在5V(USB供电)无线充电座,小型无线充电器,以及Qi无线充电器和智能手机.本文介绍了NXQ1TXA5主要特性和优势,框图和Qi A5参考设计框图.
Designed for superior performance in size- and cost-optimized 5 V wireless chargers, the NXP NXQ1TXA5 wireless charging transmitter integrates everything from power control, signal processing, on-chip current and voltage measument up to a fullbridge output power stage, and achieves standby power ratings of less than 10 mW.
Exceptionally high integration and advanced functionality serve to reduce footprint and standby power consumption. In addition to the Qi coil and resonant capacitors, the NXQ1TXA5 requires less than ten external components. Low pincount enables the use of a very small, 32 pin HVQFN package (SOT617-3) of 5 x 5 mm with a 0.5 mm pitch. This small package size and fewer external components mean the design can use a less expensive PCB. The entire transmitter design can be implemented on a PCB area of less than 2cm2 (1/3 in2).
The NXQ1TXA5 integrates NXPs low-power CoolFluxTM DSP technology and many high-performance mixed-signal features, like extremely low power device detection during standby, and Foreign Object Detection (FOD) for safe wireless charging.
The CoolFluxTM DSP processor performs ASK demodulation, which ensures reliable interoperability. Special ultra low-power circuitry detects devices placed on the wireless charger and the NXQ1TXA5 adapts the FOD function to maintain backward compatibility with Qi wireless power receivers compliant to earlier versions of the Qi low power specification.
The NXQ1TXA5 can be powered by a USB port or USB charger. Using the on-chip Smart Power function, the NXQ1TXA5 detects a drop in the supply voltage and, in response, reduces the transmitted output power. This makes it possible for the design to use a USB port capable of low output power.
For the lowest possible standby power, the NXQ1TXA5 can be powered by the NXP TEA1720, a high-efficiency GreenChip SMPS controller. The combined standby power consumption of the TEA1720 based SMPS and the NXQ1TXA5 meets the highest 5-star rating for low standby power smartphone chargers.
NXQ1TXA5主要特性:
A5/A11 transmitter according to Qi specification version 1.1.2
Fully integrated transmitter with no external active components
Low-power technology based on CoolFluxTM DSP
Extremely low component count solution
Small product package: HVQFN32 (5 x 5 mm)
Standby power of < 10 mW, including device detection
Smart Power support for supply port with limited power
Advanced ASK processing by DSP
Adaptive FOD switches automatically between V1.0 and V1.1
NXQ1TXA5主要优势:
Extremely small application size
No power wasted if charger is in standby mode
Meets highest 5-star smartphone charger standby power rating of < 30 mW
Reliable interoperability with DSP signal processing
Safe operation with FOD and optional NTC
Option to add NXP NTAG I2C NFC technology
Proven Qi compliance and interoperability with available Qi Receivers
NXQ1TXA5应用:
5 V (USB supplied) wireless charging pads
Small (portable) and cost-optimized wireless chargers
Ideal for in-the-box wireless Qi chargers, included with smartphone
5V无线充电发送器
NXP’s 5 V wireless charging transmitter architecture combines our high performance mixed signal technology, in the form of functions like on-chip voltage regulation, on-chip current and voltage measurement, ASK and foreign object detection (FOD) to optimize safe & efficient wireless charging and an integrated full bridge to drive the transmitter coil, controlled by NXP’s low power CoolFlux DSP technology.
The design provides sufficient transmitted output power to enable a 5 W wireless charger receiver output to the battery of the device to be charged, and uses advanced digital ASK signal processing to ensure reliable interoperability. The low power CoolFlux DSP technology will enable an extremely low standby power to minimize power consumption when there is no device placed on the charger. At the same time, it provides a fast device detection and wakeup when charging should start.
The single chip 5 V solution is provided in a package that measures just 5 x 5 mm and requires only very few external components. This enables the smallest possible design for a 5 V Qi low power wireless charging transmitter, with the highest possible efficiency and the lowest possible standby power. Powered by the NXP GreenChip TEA1720 high efficiency SMPS controller in the 5 V supply unit, this Qi A5/A11 wireless charging transmitter becomes an even more optimized solution. And of course, this solution can also use a standard 5 V USB charger with suitable output power.
图2. NXQ1TXA5框图
图3.Qi A5参考设计框图
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