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Design of a New Thermal shut Down Protection Circuit for LED Driver IC Applications

LED 구동회로를 위한 새로운 과열방지회로 설계

  • 허윤석 (인제대학교 나노시스템 공학과) ;
  • 정진우 (한국전기연구원) ;
  • 박원경 (인제대학교 나노공학부) ;
  • 송한정 (인제대학교 나노시스템 공학과)
  • Received : 2011.08.25
  • Accepted : 2011.12.13
  • Published : 2011.12.31

Abstract

In this paper, we designed a thermal shutdown block for LED applications using a 1 ${\mu}m$ CMOS process. The proposed thermal shutdown protection circuit has been designed with a shut-off temperature of $120^{\circ}C$ and a restart temperature of $90^{\circ}C$ which are suitable conditions for LED driver IC. Also, we got SPICE simulation results of the circuit about process variation of the semiconductor fabrication. From simulation data, process variation rate of the proposed circuit are within 7 % which are good results compared with conventional BJT current mirror type circuit. Finally, we confirmed that the thermal shutdown circuit has good thermal protection function within a LED driver IC.

Keywords

Thermal Shut-Down;Protection Circuit;LED Driver IC;CMOS;Process

Acknowledgement

Supported by : 한국연구재단

References

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