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Vol. 176, Issue 8, August 2014, pp. 210-218




Design of a High Performance Green-Mode PWM Controller IC
with Smart Sensing Protection Circuits

1 Shen-Li Chen and 2 Shih-Hua Hsu

1, 2 Dept. of Electronic Engineering, National United University, MiaoLi City 36003, Taiwan
1 Tel.: +886-37381525, fax: +886-37362809

1 E-mail: jackchen@nuu.edu.tw


Received: 26 February 2014 /Accepted: 31 July 2014 /Published: 31 August 2014

Digital Sensors and Sensor Sysstems


Abstract: A design of high performance green-mode pulse-width-modulation (PWM) controller IC with smart sensing protection circuits for the application of lithium-ion battery charger (1.52 V ~ 7.5 V) is investigated in this paper. The protection circuits architecture of this system mainly bases on the lithium battery function and does for the system design standard of control circuit. In this work, the PWM controller will be with an automatic load sensing and judges the system operated in the operating mode or in the standby mode. Therefore, it reduces system’s power dissipation effectively and achieves the saving power target. In the same time, many protection sensing circuits such as: (1) over current protection (OCP) and under current protection (UCP), (2) over voltage protection (OVP) and under voltage protection (UVP), (3) loading determintion and short circuit protection (SCP), (4) over temperature protection (OTP), (5) VDD surge-spiking protection are included. Then, it has the characteristics of an effective monitoring the output loading and the harm prevention as a battery charging. Eventually, this green-mode pulse-width-modulation (PWM) controller IC will be that the operation voltage is 3.3 V, the operation frequency is 0.98 MHz, and the output current range is from 454 mA to 500 mA. Meanwhile, the output convert efficiency is range from 74.8 % to 91 %, the power dissipation efficiency in green-mode is 25 %, and the operation temperature range is between -20 0C ~ 114 0C.


Keywords: Green-mode, Loading detection, Over current protection (OCP), Over temperature protection (OTP), Over voltage protection(OVP), Pulse-width-modulation (PWM), Short circuit protection (SCP), Under current protection (UCP), Under voltage protection (UVP).


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