Patent application number | Description | Published |
20080237630 | Semiconductor switch - A semiconductor switch comprises a PNPN structure arranged to provide an SCR-like functionality, and a MOS gate structure, preferably integrated on a common substrate. The switch includes ohmic contacts for the MOS gate, and for the cathode and gate regions of the PNPN structure; the anode contact is intrinsic. A fixed voltage is typically applied to an external node. The MOS gate structure allows current to be conducted between the external node and the intrinsic anode when on, and the PNPN structure conducts the current from the anode to the cathode when an appropriate voltage is applied to the gate contact. Regenerative feedback keeps the switch on once it begins to conduct. The MOS gate inhibits the flow of current between the external node and anode—and thereby turns off the switch—when off. When on, the MOS gate's channel resistance serves as a ballast resistor. | 10-02-2008 |
20090027123 | Controlled transconductance differential stage - A differential stage which uses a bias generator circuit to set the operating currents of the input stage FETs to make the incremental Gm primarily a function of a single resistor embedded in the biasing circuit, such that the input stage has a Gm which only gradually departs from nominal under overdrive, and continues to supply output currents which increase with an increasing differential input signal. | 01-29-2009 |
20090079405 | Linearized controller for switching power converter - A linearized controller to operate a switching power converter which includes an inductor having its first terminal coupled to a first voltage (V | 03-26-2009 |
20090167200 | SWITCHING POWER CONVERTER WITH CONTROLLED STARTUP MECHANISM - A switching power converter with a controlled startup mechanism includes a switching stage which provides a voltage V | 07-02-2009 |
20090302822 | Voltage regulator - A voltage regulator comprises first and second bipolar transistors operating at different current densities; a resistor is connected between their bases across which ΔV | 12-10-2009 |
20090302823 | Voltage regulator circuit - A voltage regulator comprises first and second bipolar transistors operating at different current densities; a resistance is connected between their bases across which ΔV | 12-10-2009 |
20120153921 | METHODS AND APPARATUSES FOR COMBINATIONS OF CURRENT FEEDBACK FOR FREQUENCY COMPENSATION, OVERLOAD DETECTION, AND SUPER OVERLOAD DETECTION IN SWITCHING POWER CONVERSION - A single replica current is proportional to current through a main switch of a switching power converter. This replica current may be used for current compensation, detection and response to an overload, detection and response to a super-overload, and combinations thereof. An input voltage is switchably coupled to an output signal generating a load current responsive to a switch control. A replica switch generates a replica current proportional to the load current. A ramp modulation signal may be generated. A voltage ramp of the ramp modulation signal may be adjusted in response to the replica current. A feedback difference signal is compared to the ramp modulation signal to generate a comparison output. Comparison of an overload reference voltage to a replica voltage proportional to the replica current generates an overload signal. The switch control is generated responsive to the comparison output and may be modified responsive to the overload signal. | 06-21-2012 |
20120155127 | METHODS AND APPARATUSES FOR COMBINED FREQUENCY COMPENSATION AND SOFT START PROCESSES - Soft start circuits for a switching power converter include an amplifier configured to operate from a common bias node and amplify a difference between a positive input and a negative input to generate an amplifier output. A soft start bias circuit supplies a soft start bias current during a soft start process for the switching power converter. An operational bias circuit supplies an operational bias current after the soft start process. In some embodiments, a capacitor is operably coupled to the amplifier output and is configured to provide a frequency compensation for the switching power converter and a charging ramp for the soft start process. In some embodiments, the soft start circuit is configured such that the soft start bias current is at least an order of magnitude smaller than the operational bias current and limits a current that the amplifier can during the soft start process. | 06-21-2012 |
20130300487 | SEMICONDUCTOR SWITCH - A semiconductor switch comprises a PNPN structure arranged to provide an SCR-like functionality, and a MOS gate structure, preferably integrated on a common substrate. The switch includes ohmic contacts for the MOS gate, and for the cathode and gate regions of the PNPN structure; the anode contact is intrinsic. A fixed voltage is typically applied to an external node. The MOS gate structure allows current to be conducted between the external node and the intrinsic anode when on, and the PNPN structure conducts the current from the anode to the cathode when an appropriate voltage is applied to the gate contact. Regenerative feedback keeps the switch on once it begins to conduct. The MOS gate inhibits the flow of current between the external node and anode—and thereby turns off the switch—when off. When on, the MOS gate's channel resistance serves as a ballast resistor. | 11-14-2013 |