How DVS works
How DVS works
DVS is commonly used in DC / DC converters that power processors. The voltage required by the processor to operate at full speed and in the idle state is different. DVS allows the system controller to change the output voltage of the DC / DC converter when needed. In mobile devices, DVS significantly extends battery life, but does not affect the running time of user programs.
Modern dynamic voltage regulation (DVS) technology and digital technology have been merged together. It connects the processor and the power converter together, dynamically adjusts the supply voltage through a digital bus such as I2C, and adjusts the frequency of the processor. Of course, simple power management does not require a complex management bus. TI ’s latest TPS728xx series LDO is based on this idea. It provides 1 to 4 output voltages through hardware pins, and one voltage output can be selected during operation. , To achieve a simple DVS.
Figure 1 DVS open loop control principle block diagram
Compared with AVS, dynamic voltage regulation (DVS) is based on the load prediction of the system and uses multiple sets of frequency and voltage pairs with different energy consumption levels to achieve regulation in an open-loop voltage control system. Therefore, the response speed and adjustment accuracy of DVS are still inferior to AVS based on full feedback. Figure 1 is a functional block diagram of DVS.
If you use a conventional DC / DC converter to achieve DVS, you need to add some additional components to the circuit for feedback. The added components include MOSFETs and some resistors. The feedback source can be taken from the output status pin of the processor, which can indicate whether the processor is currently in a low power consumption mode. Therefore, in fact, most power chips can achieve DVS, a power chip with adjustable output voltage and an external input control signal are sufficient.
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