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TC6501P065VCT データシート(PDF) 3 Page - Microchip Technology |
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TC6501P065VCT データシート(HTML) 3 Page - Microchip Technology |
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3 / 20 page  www.microchip.com/lighting LED Lighting Solutions Design Guide 3 LED Lighting Solutions LED Lighting LEDs are no longer used just for providing the pretty red and green indicator lights on electronic equipment. Advances in technology have allowed LEDs to be used as practical sources of illumination. The primary benefits of LEDs are long life, durability and efficiency. When driven properly, a power LED can last tens of thousands of hours without a degradation of light output. The typical efficacy of a power LED, measured in lumens per watt, is 40-80. This is several times greater than incandescent light sources and is only exceeded by fluorescent light sources. Since the LED is a solid-state device, it can withstand shock and vibration that would damage a filament bulb. LED Applications The benefits of LED lighting are helpful in many types of lighting applications: ■Automotive and aircraft cabin lighting ■Automotive and aircraft instrument panel lighting ■ Architectural emergency exit lighting ■ Architectural color effect lighting ■ Industrial and outdoor lighting ■ Traffic and railway signals ■ Automotive brake lights ■ Dot matrix signs and video displays ■ LCD display backlighting ■ Personal flashlights ■ Medical instrument and tool lighting ■ Digital camera flash and video light Efficient LED Control LEDs must be driven with a source of constant current. Most LEDs have a specified current level that will achieve the maximum brightness for that LED without premature failures. An LED could be driven with a linear voltage regulator configured as a constant current source. However, this approach is not practical for higher power LEDs due to power dissipation in the regulator circuit. A switch-mode power supply (SMPS) provides a much more efficient solution to drive the LED. An LED will have a forward voltage drop across its terminals for a given current drive level. The power supply voltage and the LED forward voltage characteristics determine the SMPS topology that is required. Multiple LEDs can be connected in series to increase the forward voltage drop at the chosen drive current level. The SMPS circuit topologies adopted to regulate current in LED lighting applications are the same used to control voltage in a power supply application. Each type of SMPS topology has its advantages and disadvantages as presented in the table below. This design guide presents two types of LED driver solutions. First, an analog driver IC can be used independently or together with a MCU for added intelligence. Second, the LED drive function can be integrated into the MCU application. Literature on the Web ■ AN1114 – Switch Mode Power Supply (SMPS) Topologies (Part I), DS01114 ■ AN1207 – Switch Mode Power Supply (SMPS) Topologies (Part II), DS01207 Common SMPS Topologies Useful for LED Lighting Regulator Topology VIN to VOUT Relationship Complexity Component Count Comments Charge Pump -VOUT < VIN < VOUT Low Medium – Limited IOUT range – No inductors Buck VIN > VOUT Medium Medium – Chopped IIN – High side drive Boost VIN < VOUT Medium Medium – Extra parts needed to isolate output from input SEPIC VOUT < VIN < VOUT Medium High – Smooth IIN – Multiple outputs – Two inductors Buck-Boost VOUT < VIN < VOUT Medium Medium – Single inductor – Up to four switches Flyback Depends on transformer Medium Medium – Transformer can provide electrical isolation – Multiple outputs possible |
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同様の説明 - TC6501P065VCT |
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