Optimization for power charger and universal USB charging options
Author: admin Posted on:2012-11-03 15:40:25
On the mobile device power adapter, low power consumption of less than 15W products occupy absolute market share. Charger output current with increasing battery capacity of smart phones and tablet PCs, has been increased from the previous 200mA ~ 300mA to 1A or 2.1A 5W output power is mainstream smartphone charger specifications . Low power consumption, as early as in 2008, the European Commission's Integrated Product Policy (EC IPP) 5 OEM to develop environmentally friendly battery charger rating system, no-load power consumption <30mW indicators were identified as The five-star standard, which has become consistent with the demands of mobile phone power adapter manufacturers. In addition to low power consumption, the EU has also been promoting the harmonization process USB Battery Charging the latest specification BCS 1.2 version exported to Europe, tablet PCs and smart phones can use a USB port for charging, which is a mandatory of the standard is expected in 2014 will have 90% of the mobile device power adapter complies with the standard. Based on these trends, TI recently released its first no-load power consumption <30mW primary side flyback power supply controller UCC28700, and a smart USB Universal charging port controller TPS2511. UCC28700 and TPS2511 typical USB charger program low-power charge control programs and their characteristics UCC28700 can achieve smaller square adapter, wireless power charging stations and other AC-powered devices, TPS2511 compliant with the USB Battery Charging Specification, Version 1.2, for smartphone or 5V charging adapter Tablet PC. According to business development manager for TI's semiconductor division Cheng Wentao, UCC28700 is a constant voltage constant current flyback PFM (pulse frequency modulation) controller, the the PFM way primary side controller is the best approach. UCC28700 the standby power consumption of less than 30mW, to only 1.5μA the starting current, which is able to achieve a no-load power consumption <30mW key. Primary side regulation, so no optocoupler feedback circuit, and the VDD is very wide input voltage (8V ~~ 35V), low hysteresis, IDD standby current is also very low, which makes the charger can use smaller VDD capacitor (only 330μF can), thereby reducing the size and cost. UCC28700 high switching frequency, the smaller transformer can support the full load efficiency of 70% to 80%. Universal USB Charging control programs and features TPS2511 is the only commercially available to achieve universal USB port charging controller. Some phones and tablet PCs 5W and 10W charger only to support a particular brand of equipment, great distress to mobile users. Consumers to buy new mobile devices need a new charger, adapter to increase home quantity, and ultimately generate more e-waste. "Cheng Wentao TPS2511 meet the USB Battery Charging Specification Version 1.2 requirements for the system to provide more charging algorithm. products current limit USB power switch and USB dedicated charging port recognition circuit phase integration, USB 2.0 and 3.0 data line voltage can automatically detect and correct electrical characteristics, charge safely for equipment to comply with the relevant standards. " TPS2511 comply with the the China Telecom the specification YD/T1591-2009 provisions the management requirements to support specific Tablet PC and the smartphone fast charging program and integrated automatic detection function can automatically switch to the D + / D-line connection. It also integrates the charging current detecting circuit, and means for compensating the VBUS voltage drop of the logic-level output (pin CS). TPS2511 compatible with USB 2.0 and 3.0 Power Requirements. TPS2511 also can be used in vehicle USB power charger with a USB port, AC / DC wall adapter, portable USB charger and other USB charger.
Time:2012-11-03 15:40:25
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