As my friend Brian said in his blog, everyone now carries a smartphone or tablet with them. These are the necessary equipment to send and receive business mail, pick up personal calls and get the latest information in the world. Crazy mobile games are emerging, such as Angry Birds, Candy Crush, and Words with Friends. Smartphones provide weather forecasting and navigation. These features and functions make our lives easier and more productive.
Like me, you may have to charge your device all night and start with the battery the next day. However, due to factors such as large display and highlighting, which quickly consumes power, it is difficult for current batteries to reach the standby time we need.
A convenient way to solve this problem is to charge the phone on the way to commuting. Car DC/DC chargers are not only popular but have become essential.
There are several different types of DC/DC chargers. Many cars have built-in USB ports that can be used to charge these devices. In addition, the secondary market and standing radio broadcasts provide this convenience and play music stored on the device. Finally, even if none of these devices are available, you can find a charger with a accessory port or cigarette lighter from the secondary market.
These designs typically use a car battery as an input, which means that the input voltage range is 6V to 14V under normal operating conditions and transient conditions up to 80V or higher. At currents up to 2.1A per port, the output voltage is typically 5V. This type of design consists of three main components:
Input Regulation and Filtering: Input filtering and conditioning circuitry is typically used to reduce EMI and protect downstream DC/DC converters. Some popular converter options include the TPS54240 and TPS40170. These two IC products offer a wide range of inputs and features to help engineers streamline the design process.
DC/DC conversion.
USB Charging and Protection: Protection is especially important. Who wants to have hundreds of dollars of devices destroyed by a failed charger? The battery and charger of your smartphone or tablet are actually inside the device. In order for the charging to provide the maximum charging current, the charger needs to be able to self-recognize. The TPS2511 and TPS254x devices help achieve this recognition and support the necessary USB protection.
In accordance with the above requirements, I created two USB DC/DC charger designs that you can use for free: PMP7388 and PMP7390.
For single-port chargers that are suitable for use with high-power surfaces for cigarette lighter plugs, use the PMP7388.
The TPS54240 and TPS2511 implement a non-synchronous buck converter that supports an integrated high-side FET. The TPS54240 can handle input voltages up to 40V; in order to cope with the surge voltage at the input, an adjustment circuit is used to clamp the input voltage to 39V. This output not only provides 2.1A current, but also "universal charging" via the TPS2511.
For dual port chargers, please use the PMP7390.
Use the TPS40170 synchronous buck converter with external FETs for high efficiency and low heat dissipation. This output is capable of delivering 5V at 5A and provides a “universal charging†function for each port via the TPS2511.
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