The difference of analog control and digital control DCDC?

analog control digital control difference

Hi:

I want to design a DCDC, and there are two feed back control mode, digital and analog. can anyone tell me the defect and perfect of the two mode. which mode is mainstream in the current products.

very very thanks.

pls give the detailed information!

Added after 3 seconds:

pls give the detailed information!

Re: The difference of analog control and digital control DCD

I guess you refer to using digital control loop or analog control loop. For digital control loop, you need extra ADC, and the loop latency is bigger. Both them are a defect for DC-DC control. On the contrary, the merit is the digital data can be stored for long time, so you can do sophisticated DSP alogrithm on digital loop.

I suggest this book for you:


Practical Switching Power Supply Design

Author: Marty C. Brown
Publisher: Motorola
Volume: 240 pages



**broken link removed**

Function work and cost are always the main considerations. Basic digital control chip (PID type) in nowadays takes more chip area than analog comtroller. Besides, adc and digital Digital PWM resolution and delay are the other constrains for digital design. However, digital control can do some functions (nonlinear control, adaptive control etc.) which analog one cannot achieve, and it can be changed quickly from technologies (0.35um to 90nm). It is developing quickly. Most of the market in some high-end complicated applications by using FPGA or DSP (UPS, high power PS). For mid-low end applications, analog controller dominant (computer power supply). On the other hand, except the SMPS. linear type power supply (LDO) is always looking low cost solution, therefore, analoy control type is mainstrain in LDO. There is a digital control seminar in Apec 2007. You can search Sanders (Berkeley) or Maksimovic (Colorado). They are the best in doing digital SMPS.