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7635969 |
Power supply unit and portable device
A power supply unit is adapted to automatically switch its operational mode between a light load mode and a heavy load mode depending on the level of its output current. The unit has a first error...
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7629711 |
Load independent voltage regulator
An integrated circuit package ( 202 ) includes a voltage regulator ( 208 ) and a power-out pin ( 236 ) for coupling to a load circuit ( 210 ) via a connection ( 234 ) external to the integrated...
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7622902 |
Low drop out regulator with over-current protection
An LDO with over-current protection includes a first and a second P-type transistor, a sensing resistor, a comparator, and an error amplifier. The channel aspect ratio of the first P-type...
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7609047 |
Dynamically configurable voltage regulator for integrated circuits
A voltage regulator architecture for an integrated circuit is described. An apparatus may comprise a power switch array having multiple pass transistors, a voltage regulator array having multiple...
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7602162 |
Voltage regulator with over-current protection
A linear regulator with an N-type pass transistor includes an over-current protection circuit. A current sink is used as an indicator for an over-current condition and is coupled to the output of...
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7595615 |
Systems and methods for providing over-current protection in a switching power supply
A system and method is provided for providing integrated over-current protection in a switching power supply. In one embodiment, a switching power supply could comprise a gate drive circuit...
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7592790 |
Start-up circuit with feedforward compensation for power converters
A bleeding resistor is required to discharge EMI filter of the power converter for the safety purpose. In order to save power and reduce device count, the present invention further uses this...
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7579815 |
Current controlling circuit arrangement and associated method for reducing crosstalk
A circuit arrangement and associated method for reducing crosstalk are disclosed. A load impedance is connected via a controlled current source to an input connection for supplying a supply voltage...
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7576526 |
Overcurrent detection circuit
A circuit for detecting overcurrent flowing to an output transistor. A replica transistor generates a reference voltage that is in accordance with a reference current flowing from a constant...
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7567067 |
Power supply, display device, and light source driving apparatus
A power supply is provided, which includes a DC-DC converter being supplied with an external DC input voltage and a first switching control signal and outputting a duty sensing signal of which a...
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7557556 |
Voltage control circuit
Provided is a voltage control circuit which suppresses a calorific value that generates when short-circuit fault occurs even if a voltage value of an input voltage is large. At the time of...
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7557557 |
Current detection circuit, load drive circuit, and memory storage
A stable high-precision current detection circuit capable of continuously detecting load current through a load with extremely reduced power loss. The current detection circuit has a power...
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7548044 |
Constant-voltage power circuit with fold back current limiting capability
A constant-voltage power circuit incorporating an over-current protection circuit having a fold back current limiting capability operative through low input voltages, and being capable of...
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7545127 |
Power supply controller
A parallel circuit 27 of a frequency control circuit 11 is provided as an external circuit. Thereby, the charging time t 1 depends on the characteristics of the circuit elements, which are...
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7545609 |
Direct-current stabilized power supply device
In a direct-current stabilized power supply device provided with an output transistor that receives an input voltage from the outside and a control circuit that controls the output transistor so...
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7538528 |
Constant power foldback mechanism programmable to approximate safe operating area of pass device for providing connection to load
System and methodology for supplying power to a load using a pass device for connecting the load. A current limit circuit prevents current supplied to the load from exceeding a current threshold. A...
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7535208 |
Capacitive feedback circuit
An improved capacitive feedback circuit ( 20 ) comprises a feedback capacitor ( 23 ) having its output terminal connected to a high-impedance node (N). More particularly, the improved capacitive...
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7521908 |
Method and apparatus for reducing audio noise in a switching regulator
A switching regulator utilizing on/off control that reduces audio noise at light loads by adjusting the current limit of the switching regulator. In one embodiment, a switching regulator includes a...
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7521910 |
Method and device for measuring current in a switched current path of a circuit
A method and device for measuring a switched current (I H ) comprises: sensing the switched current (I H ) with an AC current transformer to obtain an intermediate measuring signal (V HM );...
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7511464 |
Voltage regulator
Provided is a voltage regulator in which a rush current of an output circuit can be limited and a rise time of an output voltage is short. The voltage regulator includes a first output current...
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7482765 |
Lighting control apparatus of lighting device for vehicle
When a forward direction voltage of any of several LEDs 14 to 20 is lowered, a drain voltage of an NMOS transistor 70 employed in any of series regulators 24 to 30 becomes higher than a...
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7480487 |
Power regulation for field instruments
Effective power regulation may be achieved for a field instrument that derives power from a communication signal. In particular aspects, a system and process for power regulation include the...
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7432758 |
Voltage regulator for semiconductor memory
A voltage regulator as a stable power supply to internal circuits in a semiconductor memory device is provided. This regulator includes a comparing unit, a first driver transistor, a feedback unit,...
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7432695 |
Adaptive power control for hysteretic regulators
A hysteretic regulator may be set to an active mode when voltage at an output falls to a first threshold level. In the active mode, charge is applied to an output node by a current having a set...
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7411376 |
Voltage regulator having overcurrent protection circuit and method manufacturing voltage regulator
A voltage regulator has a sense transistor through which a sense current flows in accordance with a magnitude of a load current, and a sense resistor through which the sense current flows. A...
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7405547 |
Stabilized DC power supply circuit having a current limiting circuit and a correction circuit
A stabilized DC power supply circuit of the present invention includes an output current limiting circuit for limiting an output current of an output transistor, and a correction circuit for...
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7403200 |
Current sensing bi-directional switch and plasma display driver circuit
A bi-directional switch comprising first and second semiconductor switching devices, a current sensor connected in series with the switching devices, thereby forming a series circuit, a driver...
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7385380 |
Switching power supply
In a switching power supply apparatus for performing a switching control of a power MOS transistor that flows current to a coil and converting input voltage into output voltage, even if there...
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7375471 |
Charging circuit
A charging circuit has a battery 12 , switching element 14 , and resistor 16 for current detection arranged on the primary side of transformer 10 . Diode 18 and capacitor 20 for storing...
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7362080 |
Power regulator having over-current protection circuit and method of providing over-current protection thereof
A power regulator includes a pass transistor, a feedback circuit, an error amplifier and a protection circuit. The pass transistor receives an unregulated first power supply voltage, and an output...
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7358713 |
Constant voltage source with output current limitation
A constant voltage source is disclosed having an output current control element, which adjusts an output voltage of the constant voltage source by varying its output current, a control circuit,...
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7358710 |
Temperature-compensated inductor DCR dynamic current sensing
A resister network having a negative temperature coefficient (NTC) may be utilized to create a temperature compensated equivalent resistance “R” for a current sensing RC network used in...
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7355372 |
Power control system capable of balancing output currents
A power control system includes a voltage control circuit and a plurality of balance circuits. The voltage control circuit controls a voltage level at an output of the power control system...
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7327125 |
Power supply circuit having voltage control loop and current control loop
A power supply circuit includes two pass transistors that conduct current from a voltage supply terminal to an output terminal. One of the pass transistors is smaller whereas the other is larger....
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7323854 |
Zero cancellation in multiloop regulator control scheme
Control loops in a voltage regulator can be stabilized using minimal silicon area. A current limit signal, generated by a current limit control loop in the voltage regulator, can be divided to...
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7312598 |
Capacitor free low drop out regulator
A low drop out (LDO) regulator that includes a novel error amplifier, which is arranged with a first stage that employs both NMOS and PMOS devices that are similarly doped in differential pairs and...
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7289308 |
Overcurrent protection circuit
An overcurrent protection circuit has an output voltage detection resistor for detecting an output voltage. A foldback overcurrent protection circuit detects an output current flowing through an...
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7285943 |
Method of forming a reference voltage and structure therefor
A selected bandgap reference ( 11 ) of a voltage generator ( 10 ) is operated at a duty cycle that is less than one hundred percent. The seclectable bandgap reference ( 11 ) has at a high current...
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7279873 |
Current-limited protection circuit of switching power converter
A switching power converter comprises a switch, a pulse width modulation (PWM) circuit, a rectifying filter circuit and a current limited protection circuit. The input terminal of the rectifying...
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7274177 |
Overshoot suppression circuit for a voltage regulation module
An overshoot suppression circuit comprises a switch for coupling to an output of a voltage regulation module and a voltage detector for detecting an output voltage at the output. When the load to...
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7231283 |
Method for regulating the power supply of a number of multiple field devices
In a method for regulating the power supply of a plurality of field devices S 1 , S 2 , S 3 , A 1 , A 2 , connected to a data bus DBL and supplied with electrical current over the data bus DBL, the...
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7215103 |
Power conservation by reducing quiescent current in low power and standby modes
A method and circuit for automatically lowering a quiescent current at a predetermined threshold. A compact and low power current comparator is employed to detect the power consumption conditions,...
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7196502 |
Switching regulator having soft start circuit
A switching regulator has a soft start circuit having a current source, a capacitor, and a MOS transistor connected between the current source and the capacitor for undergoing controlled operations...
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7180278 |
Real current sense apparatus for a DC-to-DC converter
A real current sense apparatus for a DC-to-DC converter uses a current mirror composed by two JFETs to mirror the output current of the converter to generate a temperature-independent mirror...
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7173401 |
Differential amplifier and low drop-out regulator with thereof
A differential amplifier having a positive input terminal, a negative input terminal, an output terminal, a bias terminal and a ground terminal is provided. The differential amplifier comprises a...
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7162656 |
Dynamic protection circuit
According to one embodiment, a computer system is disclosed. The computer system includes an integrated circuits (IC), a power supply that supplies power to the IC and an over-current protection...
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7129773 |
Band-gap type constant voltage generating circuit
A band-gap type constant voltage generating circuit is produced in a semiconductor chip, and has a first potential terminal and a second potential terminal. A band-gap circuit includes first and...
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7119524 |
Control of DC/DC converters having synchronous rectifiers
A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output...
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7102342 |
Current reference circuit with voltage-to-current converter having auto-tuning function
A current reference circuit has a band gap voltage generating circuit, a voltage buffer, a voltage-to-current converting circuit and an auto-tuner. The band gap voltage generating circuit generates...
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7081742 |
Power supply apparatus provided with overcurrent protection function
A series regulator for outputting a regulated voltage and a booster circuit of a charge pump type for outputting an output voltage by boosting the regulated voltage are connected in series. The...
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