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Method of preventing spurious ringing during discontinuous conduction mode in inductive boost converters for white LED drivers
Method of preventing spurious ringing during discontinuous conduction mode in inductive boost converters for white LED drivers
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机译:防止用于白光LED驱动器的电感升压转换器中的不连续传导模式期间的寄生振铃的方法
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摘要
Circuits and methods prevent ringing of white LED drivers by adding a high voltage coil switch (CS) circuit, a high voltage edge detector circuit, and a boot strap circuit. The coil switch (CS) circuit to short the coil of a boost converter, when the current in it reaches zero during DCM, comprises a series of 2 identical HV enhancement NMOS with bulk switch system. An Edge Detector circuit senses the fast falling edge of an LX node. A Boost Strap circuit lifts the gate of coil switch circuit above the battery voltage level and turns on the coil switch. A Boost Strap (BS) system lifts the gate of CS above the VBAT level and turns on CS, wherein minimum current is required to minimize impact on efficiency.
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