ST L6599A 180W LED TV电源解决方案
ST公司的L6599A是双端控制器,提供50%占空比,谐振半桥可变频率控制和高精度振荡器,工作频率高达500kHz,轻负载时工作在突发模式,能和PFC控制器接口,600V兼容的高边栅极驱动器,非线性软起动,主要用在LCD和PDP TV,台式PC,入门级服务器,通信开关电源(SMPS),高效率工业SMPS,AC/DC适配器和开架SMPS.本文介绍了L6599A主要特性,框图和系统框图,90W AC/DC适配器应用电路图以及采用L6564,L6599A和Viper27L的185W LED TV电源主要特性,电路图和材料清单.
The L6599A is an improved revision of the previous L6599. It is a double-ended controller specific to series-resonant half bridge topology. It provides 50% complementary duty cycle: the high-side switch and the low-side switch are driven ON/OFF 180° out-of-phase for exactly the same time. Output voltage regulation is obtained by modulating the operating frequency. A fixed deadtime inserted between the turn-off of one switch and the turn-on of the other guarantees soft-switching and enables high-frequency operation.
To drive the high-side switch with the bootstrap approach, the IC incorporates a high-voltage floating structure able to withstand more than 600 V with a synchronous-driven high-voltage DMOS that replaces the external fast-recovery bootstrap diode.
The IC enables the designer to set the operating frequency range of the converter by means of an externally programmable oscillator.
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