《TI_LED_Lighting_Overview》.pptVIP

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《TI_LED_Lighting_Overview》.ppt

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《TI_LED_Lighting_Overview》.ppt

Mobile Handsets LFF Backlight TI Driver Development Groups Multiple Lighting Technologies Variables Affecting Driver Design Setting LED Current Multiple LED Configurations Analog vs PWM Dimming Analog Changing the LED’s DC current changes LED intensity i.e.,25% brightness by running a 400mA LED at 100mA Implemented with digital programming of IC or with an external voltage Solutions to Challenges TI Constant Current LED Driver Examples TPS63000 Buck/Boost Driver TPS61050 – LED Flash Driver TPS61081 – Boost Driver TPS61200 – Ultra Low Vin TPS62050 – 800-mA 10V Vin TPS62100 – 500-mA, 9V Vin TPS61165 – Mid Vin Boost LED Driver TPS40211 – Wide Vin Boost LED Driver TPS40200 – DC Adjustable Current HB LED Driver TPS5430 – DC Integrated FET HB LED Driver TPS43000 – Multi-Topology High Frequency HB LED Driver UCC280x – 24Vin Boost HB LED Driver UCC3813 – Current Mode PWM Driver Low Vin Drivers (Integrated Switch) TPS63000 96% Efficient Buck/Boost Driver Input Voltage: 1.8-V to 5.5V Output Voltage: 1.2V to 5.5V, 3.3V, 5.0V Output current Switch: 1.7A up to 1200mA output current in Buck @ 3.3V up to 800mA output current in Boost @ 3.3V Efficiency: 96% over wide Vin range (max) Automatic Transition between Step Down and Boost Mode Device Quiescent Current less than 25-μA Load Disconnect During Shutdown 2-Cell and 3-Cell Alkaline, NiCd or NiMH or Single-Cell Li Battery Powered LED Equipments TPS61080/1High Vout Boost Driver Input Voltage: 2.5V to 6.0V Output Voltage: up to 27V (max) Switch current Limit: 0.5A (TPS61080) 1.3A (TPS61081) Efficiency: 85% (max) 10 pin 3x3mm QFN package Input-to-output isolation ? great for medical Short circuit protection Overvoltage protection Thermal protection Adjustable Softstart Integrated power diode 600kHz or 1.2MHz fixed switching frequency TPS612000.3V Input Voltage Synchronous Boost Driver Input voltage: 0.3V to 5.5V Startup into full load at 0.5V input voltage 1.8V to 5.5V output voltage Switch current limit: 1.5A (