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Research and Design of a High Voltage LED Driver Circuit Based on BOOST DC-DC

Author: WangChen
Tutor: LiBinQiao
School: Tianjin University
Course: Microelectronics and Solid State Electronics
Keywords: LED Driver DC-DC Voltage Mode PWM Modulation Soft Start Over Current Protection
CLC: TN312.8
Type: Master's thesis
Year: 2009
Downloads: 268
Quote: 4
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Abstract


As the development of semiconductor materials, white LED has become the best selection for small color LCD backlighting. white LED has great market prospect especially in the portable application for its great brightness,high efficiency and long life. Considering characteristics of white LED that has great forward voltage,electricity disperse and is susceptible to temperature, they need to be driven by special power management circuits.A type of control chip of Boost DC-DC converter that drives white LEDs with constant voltage is designed in this thesis. Its operating frequency is 900 kHz, and has an input voltage of 5V to generate output voltage of 17V. The output current is adjustable simply by changing the outer sense resistor to meet customers. The chip has functions such as soft start, over current, and can drive 5 parallel connections with 5 series connection LEDs by a constant current with outer circuits.This thesis first introduces domestic and abroad current research situations of LED driver, and researches many kinds of DC-DC converters and their pros and cons, and then introduces two work pattern of the switch inductance DC-DC converter, after that analyzes the selection of the outer ring devices and important power devices of the BOOST DC-DC LED chip in detail. According to the modulation mode of the BOOST DC-DC converters, this thesis focuses on the current mode and voltage mode modulation of the DC-DC converter. Then completes the design and analysis of subcircuits, elaborates the principles and design process of main circuits such as bandgap circuit, osc circuit, synchronous rectifying and its drive circuit, soft start circuit and over current protection circuit, and analyzes the simulation results in typical circumstances. At last introduces other circuits.Upon completion of subcircuits design, the use of these modules built into the system as a whole, and uses Spectre to simulate the whole system. When the output voltage is 17V, the voltage ripples are only about 60mV. The system simulation shows that the system could be work, and system design to meet targets.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Semiconductor diode > Diodes: structure and performance > Light-emitting diodes
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