公开(公告)号：US20090189585A1

公开(公告)日：2009-07-30

申请号：US12203078

申请日：2008-09-02

申请人： HSIANG LIN HUANG ,  KENT HUANG ,  MAO CHUAN CHIEN ,  SHUN HAU KAO

发明人： HSIANG LIN HUANG ,  KENT HUANG ,  MAO CHUAN CHIEN ,  SHUN HAU KAO

IPC分类号： G05F1/62

CPC分类号： H02M3/156 ,  H02M1/32

摘要： A PWM controller for controlling a switching voltage regulator comprises a first comparator, a second comparator and a third comparator. The first comparator is configured to detect voltages of a first node and a second node so as to determine whether to stop the PWM controller. The PWM controller is stopped if a first potential is lower than a threshold, and the first potential derives from the voltage of the first node by a level shift of a first voltage difference. The second comparator is configured to detect the voltage of the first node and then to compare the voltage with a power reference voltage so as to determine whether the PWM controller receives necessary power. The third comparator is configured to compare the voltage of the second node with an enable reference voltage so as to determine whether to disable the PWN controller.

摘要翻译： 用于控制开关电压调节器的PWM控制器包括第一比较器，第二比较器和第三比较器。 第一比较器被配置为检测第一节点和第二节点的电压，以便确定是否停止PWM控制器。 如果第一电位低于阈值，则PWM控制器停止，并且第一电位从第一节点的电压导出第一电压差的电平偏移。 第二比较器被配置为检测第一节点的电压，然后将电压与功率参考电压进行比较，以便确定PWM控制器是否接收必要的功率。 第三比较器被配置为将第二节点的电压与使能参考电压进行比较，以便确定是否禁用PWN控制器。

公开(公告)号：US20090167274A1

公开(公告)日：2009-07-02

申请号：US12203043

申请日：2008-09-02

申请人： MAO CHUAN CHIEN ,  KENT HUANG ,  HSIANG LIN HUANG ,  SHUN HAU KAO

发明人： MAO CHUAN CHIEN ,  KENT HUANG ,  HSIANG LIN HUANG ,  SHUN HAU KAO

IPC分类号： G05F1/62

CPC分类号： H02M1/32 ,  H02M1/36

摘要： A PWM controller applied to a switching voltage regulator comprises a disabling circuit, a power-sensing circuit, an over-current protection circuit and a PWM logic circuit. The disabling circuit is connected to an external frequency compensation circuit for detecting a voltage used to stop the operation of the PWM controller. The power-sensing circuit is configured to stop the operation of the PWM controller if the input voltage of the high side switch is lower than a threshold. The over-current protection circuit is configured to monitor current flowing through the output circuit, and the over-current protection circuit generates an over-current protection signal when the current exceeds a threshold. The PWM logic circuit is connected to the outputs of the disabling circuit, power-sensing circuit and over-current protection circuit.

摘要翻译： 应用于开关电压调节器的PWM控制器包括禁用电路，功率感测电路，过电流保护电路和PWM逻辑电路。 禁用电路连接到外部频率补偿电路，用于检测用于停止PWM控制器的操作的电压。 功率检测电路被配置为如果高侧开关的输入电压低于阈值，则停止PWM控制器的操作。 过电流保护电路被配置为监视流过输出电路的电流，并且当电流超过阈值时，过电流保护电路产生过电流保护信号。 PWM逻辑电路连接到禁用电路，功率检测电路和过电流保护电路的输出。

公开(公告)号：US20100019747A1

公开(公告)日：2010-01-28

申请号：US12235877

申请日：2008-09-23

申请人： SHUN HAU KAO ,  MAO CHUAN CHIEN

发明人： SHUN HAU KAO ,  MAO CHUAN CHIEN

IPC分类号： G05F1/56

CPC分类号： G05F1/56

摘要： A low dropout regulator comprises a depletion mode NMOS transistor, a switch and an error amplifier. The source electrode of the depletion type NMOS transistor is coupled to a feedback circuit. The switch, controlled by a control signal, connects a supply voltage to the drain electrode of the depletion mode NMOS transistor. The non-inverting input terminal of the error amplifier is coupled to a reference voltage. The output terminal of the error amplifier is coupled to the gate electrode of the depletion mode NMOS transistor. The inverting input terminal of the error amplifier is coupled to the feedback circuit.

摘要翻译： 低压降稳压器包括耗尽型NMOS晶体管，开关和误差放大器。 耗尽型NMOS晶体管的源电极耦合到反馈电路。 由控制信号控制的开关将电源电压连接到耗尽型NMOS晶体管的漏电极。 误差放大器的非反相输入端耦合到参考电压。 误差放大器的输出端耦合到耗尽型NMOS晶体管的栅电极。 误差放大器的反相输入端耦合到反馈电路。

公开(公告)号：US20100026254A1

公开(公告)日：2010-02-04

申请号：US12236064

申请日：2008-09-23

申请人： SHUN HAU KAO ,  MAO CHUAN CHIEN

发明人： SHUN HAU KAO ,  MAO CHUAN CHIEN

IPC分类号： G05F1/573

CPC分类号： G05F1/573

摘要： An over current protection circuit for low dropout regulator comprises a sense transistor, a sense resistor, an operational amplifier and a first transistor. The sense transistor senses the current flowing through the power transistor. The sense resistor is coupled to the sense transistor and shares the same current flowing through the sense transistor. The operational amplifier outputs a control signal according to the voltage across the sense resistor and a reference voltage. The first transistor controls the power transistor according to the control signal.

摘要翻译： 用于低压差调节器的过电流保护电路包括检测晶体管，检测电阻器，运算放大器和第一晶体管。 感测晶体管感测流过功率晶体管的电流。 感测电阻器耦合到感测晶体管并且共享流过感测晶体管的相同电流。 运算放大器根据检测电阻上的电压和参考电压输出控制信号。 第一晶体管根据控制信号控制功率晶体管。