Fairchild Korea Semiconductor Ltd.

Fairchild Semiconductor Corporation

Eung-Suen Kim

Kyung-Oun Jang

Jinho Choi

An integrated circuit (IC) device includes a first function circuitry operable to perform a first function and a second function circuitry operable to perform a second function. A multi-function terminal is provided. A voltage sensing circuit is coupled to the multi-function terminal for sensing a voltage at the multi-function terminal. If the sensed voltage is above a predetermined level, the first function circuitry is activated to perform the first function. If the sensed voltage is below the predetermined level, the second function circuit is activated to perform the second function.

Terminal for multiple functions in a power supply

In an EMI canceller, a control signal generation unit includes a counter, a second flip-flop, and a multiplexer. The counter outputs first and second output signals and includes first flip-flops in series. An output of the first flip-flop reverses at every cycle of the first and second output signals of a previous first flip-flop. An output of the second flip-flop reverses at every cycle of the first or second output signal of a final first flip-flop. The second flip-flop outputs third and fourth output signals. The multiplexer passes the first output signals of the first flip-flop as a control signal when the third output signal is a first level, and passes the second output signals as the control signal when it is a second level.

EMI cancellation method and system

A switching mode power supply includes a rectifier configured to convert AC power to a first DC power, an output unit configured to convert the first DC power to a second DC power under the control of a first switch, and a pulse width modulation generator coupled to control the first switch. The pulse width modulation generator has a regulator configured to regulate the first DC power. The regulated first DC power powers the pulse width modulation generator. The regulator includes a second switch coupled to control a transmitter so that when the second switch is in a first state the transmitter transmits the first DC power to a capacitor to charge the capacitor to thereby increase the regulated first DC power, and when the switch is in a second state the transmitter does not transmit the first DC power to the capacitor to thereby allow the charge in the capacitor to reduce and in turn the regulated first DC power to reduce.

Growing community of inventors

Incheon, South Korea

Eung-Suen Kim