Renesas Electronics America Inc.

Texas Instruments Corporation

Vipul Raithatha

Allan Richard Warrington

Vinod Aravindakshan Lalithambika

Michael Jason Houston

Bhajan Singh

Tom Leslie

Rob Cox

DAC control logic for controlling a DAC for supplying a target voltage VTARGET to a switching converter is disclosed. The DAC logic comprises control logic which is configured, in response to DAC ramp-down, to decrement DAC input code supplied to the DAC in a series of steps. The DAC control logic is configured, for at least some of the steps during ramp down, to wait until at least one switching cycle has occurred in the switching converter before decrementing the DAC input code from a current value to a new value.

Device and method for controlling output voltage of a digital-to-analog converter

A method of operating a hysteretic synthetic current-mode switching regulator is disclosed. In the switching regulator, PWM pulses (PWM) are generated by a PWM generator (; FIG.) in dependence upon a ramp voltage (VR) which oscillates between upper and lower window voltages (VW+, VW&#x2212;). The ramp voltage depends on a control voltage (VC) which depends on current (IL) through an inductor (). The method comprise determining whether a period (T) equal to or greater than a given period (TREFRESH) has elapsed without a PWM pulse being generated, upon a positive determination, causing the ramp voltage to be pulled up to or above the upper window voltage (VW+) for a given duration (&#x394;T) and when said given duration has elapsed, causing the ramp voltage to decrease until a rising edge of a PWM pulse is generated.

Method and device for switching regulator control

There is provided a method for Loss of Signal Built In Self Test, and corresponding apparatus comprising: a loopback driver for receiving test signals, and for directing the test signals to at least one of a first output of the loopback driver and a second output of the loopback driver; a Digital to Analogue Converter DAC connected to the loopback driver for controlling the amplitude of the data input signals transmitted by the loopback driver; and coupling means for directing the scaled signals to a Loss of Signal detector. Also provided is a method for testing the hysteresis thresholds of an ACJTAG module, and corresponding apparatus comprising a loopback driver for receiving data test signals, and for directing the test signals to at least one of a first output of the loopback driver and a second output of the loopback driver; a Digital to Analogue Converter DAC connected to the loopback driver for controlling the amplitude of the data input signals transmitted by the loopback driver; and coupling means for directing the scaled signals to the ACJTAG block.

Built in self test

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Northampton, United Kingdom

Vipul Raithatha