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Switched mode assisted linear regulator with dynamic buck turn-off using ZCD-controlled tub switching
Switched mode assisted linear regulator with dynamic buck turn-off using ZCD-controlled tub switching
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机译:开关模式辅助线性稳压器,具有通过ZCD控制的浴盆开关进行动态降压关闭的功能
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摘要
A switched mode assisted linear regulator includes a linear amplifier (LA) and a buck converter configured as a current source. In example embodiments, the buck converter circuit includes a power switch M1 with an M1 body diode (tub), and includes buck turn-off circuitry configured to avoid negative inductor current by controlled switching of the tub to the higher of VIN and a second voltage. For DC-coupled configurations, boost functionality is provided by an LA boost supply, and the tub is switched to the boost supply. For AC-coupled configurations, boost functionality can be provided without boosting the LA supply rail by constraining signal peak-to-peak amplitude to be less than the LA supply voltage (maintaining a DC-average voltage on the AC-coupling capacitor), and the tub is switched to the higher of VIN and VOUT. The buck turn-off circuitry can include zero crossing detection to control M1 tub switches.
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