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1. 发明授权

US5804955A Low voltage current limit circuit with temperature insensitive foldback network 失效
标题翻译：低压限流电路，具有温度不敏感的折返网络
公开(公告)号：US5804955A
公开(公告)日：1998-09-08
申请号：US741625
申请日：1996-10-30
申请人： Claudio Tuozzolo , George E. Schuellein
发明人： Claudio Tuozzolo , George E. Schuellein
IPC分类号： G05F1/46 , G05F1/56 , G05F3/30
CPC分类号： G05F1/56 , G05F3/30 , G05F1/468
摘要： A voltage regulator with a current limit circuit for limiting pass current in a pass transistor below a current limit threshold and a foldback circuit for lowering the current limit threshold when the voltage differential between the input and output terminals of the voltage regulator exceeds a foldback threshold, where the current limit threshold has a negative temperature coefficient, the current limit circuit comprising two transistors coupled to a sense resistor such that the difference in emitter-to-base voltages of the transistors is equal to the voltage drop of the sense resistor, where the collectors of the two transistors provides first and second currents to first and second resistors, respectively, where the first current is responsive to a pass current flowing through the sense resistor and decreases when the pass current increases, where the second current is independent of the pass current, and the foldback circuit provides a third current to the second resistor when the voltage differential between the input and output terminals of the voltage regulator exceeds the foldback threshold. A comparator circuit compares a first voltage drop developed across the first resistor with a second voltage drop developed across the second resistor, and limits base current to the pass transistor based upon the ratio of first and second voltage drops to thereby prevent the pass current from exceeding the current limit threshold.
摘要翻译：一种具有限流电路的电压调节器，用于将传输晶体管中的通过电流限制在电流限制阈值以下，以及当电压调节器的输入和输出端之间的电压差超过折返阈值时降低电流限制阈值的折返电路，其中电流限制阈值具有负温度系数，电流限制电路包括耦合到检测电阻器的两个晶体管，使得晶体管的发射极到基极电压的差值等于检测电阻器的电压降，其中两个晶体管的集电极分别向第一和第二电阻器提供第一和第二电流，其中第一电流响应流过检测电阻器的通过电流并且当通过电流增加时减小，其中第二电流独立于通过电流和折返电路提供第三电流到第二电阻器电压调节器的输入和输出端子之间的电压差超过折返阈值。比较器电路将跨第一电阻器开发的第一电压降与横跨第二电阻器的第二电压降进行比较，并且基于第一和第二电压降的比率将基极电流限制到通过晶体管，从而防止通过电流超过当前限制阈值。

2. 发明授权

US5886511A Temperature insensitive foldback network 失效
标题翻译：温度不敏感的折返网络
公开(公告)号：US5886511A
公开(公告)日：1999-03-23
申请号：US063980
申请日：1998-02-21
申请人： Claudio Tuozzolo , George E. Schuellein
发明人： Claudio Tuozzolo , George E. Schuellein
IPC分类号： G05F1/46 , G05F1/56 , G05F3/30
CPC分类号： G05F1/56 , G05F3/30 , G05F1/468
摘要： A foldback circuit which responds to a voltage differential between the input and output terminals of a voltage regulator in excess of a foldback threshold by lowering the current limit threshold of a current limit circuit. The foldback circuit includes a transistor with a base coupled to the input voltage and an emitter coupled to the output voltage. The collector when conducting provides a current that decreases the current limit threshold. Diodes in the path between the input and output voltages through the transistor may be used in establishing the foldback threshold.
摘要翻译：折返电路，其通过降低限流电路的电流限制阈值来响应电压调节器的输入和输出端子之间的电压差超过折返阈值。折返电路包括具有耦合到输入电压的基极的晶体管和耦合到输出电压的发射极。集电极在导通时提供降低电流限制阈值的电流。在通过晶体管的输入和输出电压之间的路径中的二极管可用于建立折返阈值。

3. 发明授权

US5955910A Switch with programmable delay 有权
标题翻译：切换可编程延迟
公开(公告)号：US5955910A
公开(公告)日：1999-09-21
申请号：US132511
申请日：1998-08-11
申请人： Gedaly Levin , Christopher J. Sanzo , Arthur R. Theroux , George E. Schuellein
发明人： Gedaly Levin , Christopher J. Sanzo , Arthur R. Theroux , George E. Schuellein
IPC分类号： H02M3/335 , H03K17/0812 , H03K17/284 , H03K17/687 , H03K17/296 , G05F1/40
CPC分类号： H03K17/08126 , H02M3/33561 , H02M3/33592 , H03K17/284 , H03K17/6877 , H02M2001/0032 , H02M2001/009 , Y02B70/1475 , Y02B70/16
摘要： A programmable delay circuit employs a comparator to control an output driver. The comparator compares a ramp signal to an error control signal derived from an error amplifier or in the alternative to a disable signal. The output of the comparator is latched on until a reset signal is received. The reset signal is produced when the ramp signal is discharged below a predetermined level. The programmable delay circuit is useful in a secondary side post regulator to control a totem pole driver. The totem pole driver in turn controls a switching device coupled to a voltage on a secondary winding.
摘要翻译：可编程延迟电路采用比较器来控制输出驱动器。比较器将斜坡信号与从误差放大器导出的误差控制信号进行比较，或者替代禁用信号。比较器的输出被锁存，直到接收到复位信号。当斜坡信号放电到预定电平以下时产生复位信号。可编程延迟电路在次级侧后调节器中用于控制图腾柱驱动器。图腾柱驱动器又控制耦合到次级绕组上的电压的开关装置。

4. 发明授权

US5841313A Switch with programmable delay 失效
标题翻译：切换可编程延迟
公开(公告)号：US5841313A
公开(公告)日：1998-11-24
申请号：US682153
申请日：1996-07-17
申请人： Gedaly Levin , Christopher J. Sanzo , Arthur R. Theroux , George E. Schuellein , Richard Patch
发明人： Gedaly Levin , Christopher J. Sanzo , Arthur R. Theroux , George E. Schuellein , Richard Patch
IPC分类号： H02M3/335 , H03K17/0812 , H03K17/284 , H03K17/687 , H03K17/296 , G05F1/40
CPC分类号： H03K17/08126 , H02M3/33561 , H02M3/33592 , H03K17/284 , H03K17/6877 , H02M2001/0032 , H02M2001/009 , Y02B70/1475 , Y02B70/16
摘要： A programmable delay circuit employs a comparator to control an output driver. The comparator compares a ramp signal with a disable signal or an error control signal derived from an error amplifier. The comparator latches the output on until a reset signal is received. The reset signal is produced when the ramp signal is discharged below a predetermined level. The programmable delay circuit is useful in a secondary side post regulator to control a grounded totem pole driver. The totem pole driver in turn controls a switching device coupled to a voltage on a secondary winding.
摘要翻译：可编程延迟电路采用比较器来控制输出驱动器。比较器将斜坡信号与禁用信号或从误差放大器导出的误差控制信号进行比较。比较器锁存输出，直到接收到复位信号。当斜坡信号放电到预定电平以下时产生复位信号。可编程延迟电路在次级侧稳压器中用于控制接地图腾柱驱动器。图腾柱驱动器又控制耦合到次级绕组上的电压的开关装置。

5. 发明授权

US5805401A Undervoltage lockout circuit with sleep pin 失效
标题翻译：欠电压锁定电路，带有睡眠引脚
公开(公告)号：US5805401A
公开(公告)日：1998-09-08
申请号：US682144
申请日：1996-07-17
申请人： George E. Schuellein , Arthur R. Theroux , Christopher J. Sanzo , Gedaly Levin
发明人： George E. Schuellein , Arthur R. Theroux , Christopher J. Sanzo , Gedaly Levin
IPC分类号： H03K17/22 , H03K17/30 , H02H3/24
CPC分类号： H03K17/22 , H03K17/30
摘要： A sleep switch connected to a ramp pin, an undervoltage lockout circuit and a hysteretic differential comparator for use in the undervoltage lockout circuit are disclosed. An integrated circuit has a comparator that receives a voltage from the ramp pin which it compares with a control voltage. The sleep switch connected to the ramp pin is activated when the ramp pin is below a predetermined voltage threshold at which point it puts the integrated circuit into a low power consumption sleep mode. The undervoltage lockout circuit includes a detection leg connected between the supply terminal and ground. A current supply is enabled when the voltage across a resistive portion of a detection leg rises above a first threshold. A differential comparator is responsive to the detection voltage for enabling the current supply. The differential comparator may include three transistors arranged to provide first and second detection thresholds so as to establish a hysteresis.
摘要翻译：公开了连接到斜坡引脚，欠压锁定电路和用于欠压锁定电路的迟滞差分比较器的睡眠开关。集成电路具有比较器，该比较器从斜坡引脚接收与电压相比的电压。当斜坡引脚低于预定的电压阈值时，连接到斜坡引脚的睡眠开关被激活，此时将集成电路置于低功耗睡眠模式。欠压锁定电路包括连接在供电端子和地之间的检测支路。当检测支路的电阻部分上的电压升高到高于第一阈值时，电流源被启用。差分比较器响应于用于启用电流供应的检测电压。差分比较器可以包括布置成提供第一和第二检测阈值以便建立滞后的三个晶体管。

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