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

LED 구동회로를 위한 새로운 과열방지회로 설계

  • 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

References

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Acknowledgement

Supported by : 한국연구재단