Texas Instruments Corporation

Chienyu Huang

Abidur Rahman

Huijuan Li

Peng Cao

Vishnu Ravinuthula

An integrated circuit (IC) includes an oscillator circuit having a control input. A control circuit has a control output coupled to the control input. The control circuit is configured to generate a control signal to the control input of the oscillator circuit to cause: the oscillator circuit to be configured as a frequency-locked loop in response to the control signal being in a first state; and the oscillator circuit to be configured as a phase-locked loop in response to the control signal being in a second state.

Configurable frequency-locked loop/phase-locked loop oscillator

An output stage for an LED driver is provided. In particular, a low voltage clamp, which uses several cascode circuits, is provided to protect low voltage switching transistors in the range of two times higher voltage application under both normal and fault conditions. Additionally, a circuit for regulating the bias voltage applied to each of the cascode circuits is provided to prevent damage during startup, while an internal voltage regulator is settling.

Clamp to enable low voltage switching for high voltage terminal applications

A circuit for independently controlling slew and propagation delay of a current DAC is provided. The circuit applies dual slope technique with feed-back control the gate (or control electrode) of a switching transistor to make propagation delay independent control from rise/fall slew rate. This allows one to adjust propagation delay and current slew rate separately to achieve better performance.

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Plano, TX, United States of America

Chienyu Huang