Mixed digital pulse duration modulater suitable for digital power supply controller

Abstract

The invention belongs to the integrated circuit technical field, especially a mixed digital pulse modulator used in a digital supply controllers composed of an adaptive offset voltage generation circuit, a 8-stage voltage-controlled loop oscillator and a digital control part, in which, the adaptive offset voltage generation circuit generates an offset voltage Vctrl compensated by temperature technique to control the 8-stage voltage-controlled loop oscillator and a 16-phase clock C0-C15 which is not influenced by outside temperature or technical offset, and the digital control part generates a modulated pulse with the resolution of n-bit according to the 16-phase clock staggered for 1 / 16 period orderly and n-bit duty ratio input from outside d[n-1 :0]. The 16-phase clock generated by the invention is not sensitive to the technical temperature change, so that the system can keep the clock stability even under a bad work environment, further ensure the stability of the output modulation pulse; and effectively reduce the frequency of the system clock, and can avoid the problems of timing limitation and power consumption caused by the high clock frequency.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a novel hybrid digital pulse width modulator suitable for a digital power supply controller. Background technique [0002] With the rapid development of electronic information technology, people's life has become more and more inseparable from various consumer electronic products, and a power supply with excellent performance is a prerequisite for these electronic products to play their functions. Switching power supply technology is widely used due to its advantages of high conversion efficiency and wide voltage regulation range. At the same time, the switching power supply also has the advantages of small size and light weight, and is more suitable for portable electronic products such as mobile phones, digital cameras, and notebook computers. Using switching power supply for key modules can not only prolong the battery life of the device, but also isol...

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Problems solved by technology

[0008] The purpose of the present invention is to propose a new type of hybrid digital pulse width modulator suitable for digital power supply controllers, so as to overcome the shortcomings of existing digital pulse width modulators such as low stability, low speed, low resolution and large area , to meet the needs of today's digital power controllers

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