TY - GEN
T1 - A white LED boost IC for backlight of TFTLCD based on a current-limited pulse-width modulation
AU - Sung, Guo Ming
AU - Lu, You Hsiang
PY - 2011
Y1 - 2011
N2 - This paper presents a boost DC-to-DC switching converter which is implemented with current-limited pulse width modulation (PWM) to drive various white LEDs in the backlight of TFTLCD. The proposed white LED boost IC consists of the bandgap reference, error amplifier, hysteresis comparator, linear ramp generator, voltage-to-current converter and driving buffer which are designed and implemented with a standard 0.35-μm 2P4M CMOS technology. Notify that the proposed bandgap reference can provide a reference voltage and a reference current, simultaneously. Besides, the white LED boost IC can eliminate sub-harmonic oscillation using a slope-compensation technique. Simulation results show that the output voltage, output current, output voltage ripple and output current ripple are 18 V, 20 mA, 5.98 mV and 41.8 μA, respectively, at a power supply of 3.3 V. The proposed white LED boost IC can drive five white LEDs with a power efficiency of 85% and a chip area of 0.89×0.92 mm 2.
AB - This paper presents a boost DC-to-DC switching converter which is implemented with current-limited pulse width modulation (PWM) to drive various white LEDs in the backlight of TFTLCD. The proposed white LED boost IC consists of the bandgap reference, error amplifier, hysteresis comparator, linear ramp generator, voltage-to-current converter and driving buffer which are designed and implemented with a standard 0.35-μm 2P4M CMOS technology. Notify that the proposed bandgap reference can provide a reference voltage and a reference current, simultaneously. Besides, the white LED boost IC can eliminate sub-harmonic oscillation using a slope-compensation technique. Simulation results show that the output voltage, output current, output voltage ripple and output current ripple are 18 V, 20 mA, 5.98 mV and 41.8 μA, respectively, at a power supply of 3.3 V. The proposed white LED boost IC can drive five white LEDs with a power efficiency of 85% and a chip area of 0.89×0.92 mm 2.
UR - https://www.scopus.com/pages/publications/80053619204
U2 - 10.1109/MWSCAS.2011.6026415
DO - 10.1109/MWSCAS.2011.6026415
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AN - SCOPUS:80053619204
SN - 9781612848570
T3 - Midwest Symposium on Circuits and Systems
BT - 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011
T2 - 54th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2011
Y2 - 7 August 2011 through 10 August 2011
ER -