公开(公告)号：US09112409B2

公开(公告)日：2015-08-18

申请号：US14586151

申请日：2014-12-30

Applicant: Texas Instruments Incorporated

Inventor： Yushan Li ,  Kevin Vannorsdel ,  Steven K. Berg

IPC: H02M3/158

CPC classification number: H02M3/158 ,  H02M3/1588 ,  H02M2001/0045 ,  H03F1/0227 ,  H03F3/2173 ,  H03F2200/432 ,  Y02B70/1466

Abstract: 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.

Abstract translation: 开关模式辅助线性调节器包括线性放大器（LA）和配置为电流源的降压转换器。 在示例实施例中，降压转换器电路包括具有M1体二极管（桶）的功率开关M1，并且包括降压断开电路，其配置为通过将桶的控制切换控制到VIN的较高值来避免负的电感器电流，并且第二电压 。 对于直流耦合配置，升压功能由LA升压电源提供，并且桶被切换到升压电源。 对于交流耦合配置，可以提供升压功能，而不会通过将信号峰峰值幅度约束到小于LA电源电压（保持交流耦合电容器上的直流平均电压）来增强LA电源轨，以及 桶被切换到较高的VIN和VOUT。 降压关断电路可以包括过零检测以控制M1桶开关。

公开(公告)号：US20150155783A1

公开(公告)日：2015-06-04

申请号：US14586151

申请日：2014-12-30

Applicant: Texas Instruments Incorporated

Inventor： Yushan Li ,  Kevin Vannorsdel ,  Steven K. Berg

IPC: H02M3/158

CPC classification number: H02M3/158 ,  H02M3/1588 ,  H02M2001/0045 ,  H03F1/0227 ,  H03F3/2173 ,  H03F2200/432 ,  Y02B70/1466

Abstract: 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.

Abstract translation: 开关模式辅助线性调节器包括线性放大器（LA）和配置为电流源的降压转换器。 在示例实施例中，降压转换器电路包括具有M1体二极管（桶）的功率开关M1，并且包括降压断开电路，其配置为通过将桶的控制切换控制到VIN的较高值来避免负的电感器电流，并且第二电压 。 对于直流耦合配置，升压功能由LA升压电源提供，并且桶被切换到升压电源。 对于交流耦合配置，可以提供升压功能，而不会通过将信号峰峰值幅度约束到小于LA电源电压（保持交流耦合电容器上的直流平均电压）来增强LA电源轨，以及 桶被切换到较高的VIN和VOUT。 降压关断电路可以包括过零检测以控制M1桶开关。