Abstract:
A pulse width modulation (PWM) generator featuring very high speed and high resolution capability and the ability to generate standard complementary PWM, push-pull PWM, variable offset PWM, multiphase PWM, current limit PWM, current reset PWM, and independent time base PWM while further providing automatic triggering for an analog-to-digital conversion (ADC) module that is precisely timed relative to the PWM signals. Applications include control of a switching power supply that requires very high speed operation to obtain high resolution at high switching frequencies, and the ability to vary the phase relationships among the PWM output signals driving the power supply power components. A single PWM duty cycle register may be used for updating any and/or all PWM generators at once to reduce the workload of a digital processor as compared to updating multiple duty cycle registers.
Abstract:
A pulse width modulation (PWM) generator having asynchronous updating of its PWM duty cycle and/or period values allows immediate correction for the new PWM duty cycle and/or period values instead of waiting until the end of a PWM period to accept the new duty cycle and/or period values. This reduces the latency in a control loop when responding to changing system status, e.g., changes in PWM duty cycle. Also the PWM duty cycle is prevented from “running away” (e.g., missing a PWM cycle) if the PWM duty cycle timer/counter has advanced beyond an updated duty-cycle maximum value.
Abstract:
A switch mode power supply has pulse width modulation (PWM) frequency dithering of a PWM clock frequency. The PWM frequency dithering circuit may change the frequency of the PWM clock based upon each of a plurality of frequencies. A PWM time base circuit may comprise a period register containing a PWM period value, a comparator, and a PWM counter, wherein a PWM count value may be incremented in the PWM counter by the variable frequency PWM clock, the comparator may compare the PWM period value with the PWM count value and when the PWM period value and the PWM count value are substantially equal the PWM count value may be reset. The PWM frequency dithering circuit may comprise a roll counter, wherein the roll counter changes a roll count value each time the comparator resets the PWM count value in the PWM counter; a multiplexer having a plurality of inputs and an output, wherein the output is coupled to each one of the plurality of inputs of the multiplexer based upon the roll counter count value; and a plurality of frequency registers, each one of the plurality of frequency registers may be coupled to a respective one of the plurality of inputs of the multiplexer; wherein the output of the multiplexer may be coupled to a frequency control input of the variable frequency PWM clock such that frequency values stored in the plurality of frequency registers may be used in determining the variable frequency PWM clock frequency.
Abstract:
An integrated circuit device has a digital device operating at an internal core voltage; a linear voltage regulator; and an internal switched mode voltage regulator controlled by the digital device and receiving an external supply voltage being higher than the internal core voltage through at least first and second external pins and generating the internal core voltage, wherein the internal switched mode voltage regulator is coupled with at least one external component through at least one further external pin of the plurality of external pins.
Abstract:
Multi-phase, frequency coherent pulse width modulation (PWM) signals are generated that maintain PWM data-set coherency regardless of user or system events. PWM data-set coherency is accomplished by adding data buffers to hold and transfer new PWM data during a data-set update from a processor. After the data-set transfer to the data buffers is complete and when the next PWM cycle is about to start, the data-set stored in the data buffers is transferred to the active PWM registers in time for the start of the next PWM cycle.
Abstract:
Using a combination of frequency dithering of a PWM counter and a variable time delay circuit yields improved PWM frequency resolution with realizable circuit components and clock operating frequencies. A controllable time delay circuit lengthens a PWM signal during the first PWM cycle. During the second PWM cycle, the PWM period is increased beyond the desired amount, but the delay is reduced during this second PWM cycle to achieve the correct (desired) PWM signal period. The dithering of the PWM signal period enables the time delay circuit to be “reset” so that an infinite delay circuit is not required. The time delay circuit provides short term (one cycle) frequency adjustment so that the resulting PWM cycle is not dithered and has a period at the desired frequency resolution.
Abstract:
Waveform errors between multiphase PWM signals caused by external synchronization signals is solved by providing a capture register in a master time base circuit. The capture register is triggered by the external sync signal so as to “capture” the value of the master time base counter at the occurrence of the rising edge of the external sync signal. This captured counter value is then provided to the local time bases of each of the phase PMW signal generators as the effective PWM period instead of locally stored PWM period values of each PWM signal generator. The captured time base value provided to the individual PWM generator time bases insures that the individual PWM generators remain properly synchronized to the master time base throughout the PWM cycles of all of the phases.
Abstract:
A plurality of power supply modules having their outputs coupled in parallel are controlled for load balancing purposes through a digital communications channel. The digital communications channel may be a wired digital serial or parallel bus, and/or a wireless digital communications channel such as Bluetooth, infrared, etc. Each of the plurality of power supply modules may broadcast their respective output currents and all of the plurality of power supply modules may determine a total current supplied to a load and thereby determine an appropriate output voltage for proportionally contributing to the total current.
Abstract:
A plurality of power supply modules having their outputs coupled in parallel are controlled for load balancing purposes through a direct current bus having filtered pulse width modulation (PWM) signals representative of the power outputs of each of the plurality of power supply modules. A local PWM signal for each of the plurality of power supply modules is filtered to a DC voltage and used to compare with an average power required from each of the plurality of power supply modules.
Abstract:
The present invention relates generally to functional pathway configurations at the interfaces between integrated circuits (ICs) and the circuit assemblies with which the ICs communicate. More particularly, the present invention relates generally to the functional pathway configuration at the interface between one or more semiconductor integrated circuit dice, including an IC package and the circuitry of a system wherein the integrated circuit dice is a digital signal controller. Even more particularly, the present invention relates to a 18, 28, 40, 44, 64 or 80 pin functional pathway configuration for the interface between the digital signal controller and the system in which it is embedded.