The Study on the design of PWM IC with Power Device for SMPS application
Dongju Lim, Yong-Seo Koo · Journal of IKEEE · 2004
In this study, we design the one-chip PWM IC with high voltage power switch (300V class LDMOSFET) for SMPS (Switching Mode Power Supply) application. Reference circuits generate constant voltage(5V) in the various of power supply and temperature condition. Error amp. is designed with large DC gain , unity frequency and large . comparator is designed with 2 stage. Saw tooth generators operate with 20kHz oscillation frequency. Also, we optimize drift concentration & drift length of n-LDMOSFET for design of high voltage switching device. It is shown that simulation results have the breakdown voltage of 350V. (using ISE-TCAD Simulation tool). PWM IC with power switching device is designed with 2um design rule and Bi-DMOS technology.