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1. 发明申请

WO2008103835A3 FRACTIONAL CHARGE PUMP FOR STEP-DOWN DC-DC CONVERTER 审中-公开
标题翻译：用于降压DC-DC转换器的分体充电泵
公开(公告)号：WO2008103835A3
公开(公告)日：2008-10-16
申请号：PCT/US2008054596
申请日：2008-02-21
申请人： CATALYST SEMICONDUCTOR INC , GEORGESCU SORIN S , RUSSELL ANTHONY G , BARTHOLOMEUEZ CHRIS
发明人： GEORGESCU SORIN S , RUSSELL ANTHONY G , BARTHOLOMEUEZ CHRIS
IPC分类号： G05F1/10
CPC分类号： H02M3/07 , H02M2003/072
摘要： A charge pump provides a multiplication factor of 2/3 by using a three-phase mode of operation. In a first mode, first and second capacitors are charged from an input voltage while a third capacitor drives the output voltage based on stored charge in the third capacitor. In a second mode, the output terminal is connected to the common node of the first and second capacitors. In a third mode, the voltage potential across the second capacitor is subtracted from the sum of the input voltage and the voltage potential across the first capacitor to generate the output voltage. Operated in this manner, the first, second, and third capacitors will provide the desired 2/3x voltage multiplication. This relatively low multiplication factor can be beneficial in applications requiring 2.5V and 1.8V supplies for integrated circuits, particularly where the input voltage is provided by a lithium battery.
摘要翻译：电荷泵通过使用三相工作模式提供2/3的倍增系数。在第一模式中，第一和第二电容器从输入电压充电，而第三电容器基于第三电容器中存储的电荷来驱动输出电压。在第二模式中，输出端子连接到第一和第二电容器的公共节点。在第三模式中，从第一电容器两端的输入电压和电压电平之和减去第二电容器两端的电压电位，以产生输出电压。以这种方式操作，第一，第二和第三电容器将提供期望的2 / 3x电压倍增。这种相对较低的乘法因子对于集成电路需要2.5V和1.8V电源的应用可能是有益的，特别是在输入电压由锂电池提供的情况下。

2. 发明申请

WO2007053247A2 LED BIAS CURRENT CONTROL USING ADAPTIVE FRACTIONAL CHARGE PUMP 审中-公开
公开(公告)号：WO2007053247A2
公开(公告)日：2007-05-10
申请号：PCT/US2006036955
申请日：2006-09-21
申请人： CATALYST SEMICONDUCTOR INC
发明人： GEORGESCU SORIN S , RUSSELL ANTHONY G , BARTHOLOMEUSZ CHRIS B
IPC分类号： G05F1/10
CPC分类号： H02M3/07 , H05B33/0815 , Y02B20/347
摘要： A charge pump provides a multiplication factor of 4/3 by using a three-phase mode of operation. In a first mode, first and second capacitors are charged from an input voltage while a third capacitor drives the output voltage based on stored charge in the third capacitor. In a second mode, the voltage potential across the first capacitor is added to the input voltage to generate the output voltage. In a third mode, the voltage potential across the first capacitor is subtracted from the sum of the input voltage and the voltage potential across the second capacitor to generate the output voltage. Operated in this manner, the first, second, and third capacitors will provide the desired 4/3x voltage multiplication. This relatively low multiplication factor can be beneficial in applications such as white LED driver circuits, particularly where the input voltage is provided by a battery.

3. 发明申请

WO2006116576A3 LED CURRENT BIAS CONTROL USING A STEP DOWN REGULATOR 审中-公开
标题翻译：使用降压型稳压器的LED电流偏置控制
公开(公告)号：WO2006116576A3
公开(公告)日：2007-05-18
申请号：PCT/US2006015970
申请日：2006-04-24
申请人： CATALYST SEMICONDUCTOR INC , RUSSELL ANTHONY G , BARTHOLOMEUSZ CHRIS B
发明人： RUSSELL ANTHONY G , BARTHOLOMEUSZ CHRIS B
IPC分类号： G05F1/613
CPC分类号： H05B33/0818
摘要： A step down switching regulator circuit that is particularly well-suited to drive high power LEDs includes a crossover conduction mode (XCM) control circuit that maintains operation at the crossover point between continuous conduction mode (CCM) and discontinuous conduction mode (DCM). This XCM operation provides an inductor current waveform that ramps up and down between zero and a desired maximum current. One or more comparators in the XCM control circuit can be used to control switching between the inductor current ramp up and ramp down phases. In this manner, complex feedback loop logic and PID controlled PWM signal generation logic can be avoided, and the need for external sense resistors and associated interface pins can be eliminated.
摘要翻译：特别适合于驱动高功率LED的降压开关稳压器电路包括跨连接导通模式（XCM）控制电路，其在连续导通模式（CCM）和不连续导通模式（DCM）之间的交叉点保持工作。该XCM操作提供了电感电流波形，其在零和期望的最大电流之间上下颠倒。可以使用XCM控制电路中的一个或多个比较器来控制电感电流斜坡上升和降压阶段之间的切换。以这种方式，可以避免复杂的反馈环路逻辑和PID控制PWM信号产生逻辑，并且可以消除对外部检测电阻和相关接口引脚的需求。

4. 发明申请

WO2007053247B1 LED BIAS CURRENT CONTROL USING ADAPTIVE FRACTIONAL CHARGE PUMP 审中-公开
标题翻译： LED偏置电流控制使用自适应分数电荷泵
公开(公告)号：WO2007053247B1
公开(公告)日：2007-10-04
申请号：PCT/US2006036955
申请日：2006-09-21
申请人： CATALYST SEMICONDUCTOR INC
发明人： GEORGESCU SORIN S , RUSSELL ANTHONY G , BARTHOLOMEUSZ CHRIS B
IPC分类号： G05F1/10
CPC分类号： H02M3/07 , H05B33/0815 , Y02B20/347
摘要： A charge pump provides a multiplication factor of 4/3 by using a three-phase mode of operation. In a first mode, first and second capacitors are charged from an input voltage while a third capacitor drives the output voltage based on stored charge in the third capacitor. In a second mode, the voltage potential across the first capacitor is added to the input voltage to generate the output voltage. In a third mode, the voltage potential across the first capacitor is subtracted from the sum of the input voltage and the voltage potential across the second capacitor to generate the output voltage. Operated in this manner, the first, second, and third capacitors will provide the desired 4/3x voltage multiplication. This relatively low multiplication factor can be beneficial in applications such as white LED driver circuits, particularly where the input voltage is provided by a battery.
摘要翻译：电荷泵通过使用三相操作模式提供4/3倍增因子。在第一模式中，第一和第二电容器从输入电压充电，而第三电容器基于第三电容器中存储的电荷驱动输出电压。在第二种模式中，第一电容器两端的电压被加到输入电压上以产生输出电压。在第三模式中，从输入电压和第二电容器两端的电压电势之和中减去第一电容器两端的电压电势，以产生输出电压。以这种方式操作，第一，第二和第三电容器将提供期望的4 / 3x电压倍增。这种相对较低的乘法因子在诸如白色LED驱动器电路等应用中可能是有益的，特别是在输入电压由电池提供的情况下。

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