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| ILD6070 60V 0.7A高效LED驅(qū)動(dòng)方案 |
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| 文章來(lái)源： 更新時(shí)間：2015/1/31 10:22:00 |
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Infineon公司的ILD6070是60V/0.5A高效降壓LED驅(qū)動(dòng)器,電源電壓從4.5V到60V,開(kāi)關(guān)頻率高達(dá)1MHz,軟起動(dòng)功能,模擬和PWM調(diào)光,輸出電流精度3%,LED電流溫度漂移很低,效率高達(dá)98%,調(diào)光比3000:1,主要用在通用照明的LED驅(qū)動(dòng)器,街道和隧道照明以及辦公室和住宅區(qū)照明,LED鎮(zhèn)流器.本文介紹了ILD6070主要特性,框圖,應(yīng)用電路,以及ILD6070 60V/0.5A演示板電路,電路圖,材料清單和PCB設(shè)計(jì)布局圖.
The ILD6070 is a hysteretic buck LED driver IC for driving high power LEDs in general lighting applications with average currents up to 0.7 A.
The ILD6070 is suitable for LED applications with a wide range of supply voltages from 4.5 V to 60 V. A multifunctional PWM input signal allows dimming of the LEDs with an analog DC voltage or an external PWM signal. To minimize colorshifts of the LEDs an analog PWM voltage is converted to an internal 1.6 kHz PWM signal modulating the LED current.
The ILD6070 incorporates an undervoltage lock-out that will shut down the IC when the minimum supply voltage threshold is exceeded. The over-current protection turns off the output stage once the output current is above the current threshold. An integrated over-temperature protection circuit will start to reduce the LED current by internal PWM modulation once the adjustable junction temperature threshold of the IC is exceeded. Realizing a thermal coupling between LED driver IC and LEDs this feature eliminates the need of external temperature senors as NTCs or PTCs.
Thanks to the hysteretic concept the current control is extremely fast and always stable. A maximum contrast ratio of 3000:1 can be achieved depending of the dimensioning of the external components. The efficiency of the LED driver IC is remarkable high, reaching up to 98% of efficiency over a wide range. The output current accuracy from device to device and under all load conditions and over temperature is limited to a minimum, making ILD6070 the perfect fit for LED ballasts.
ILD6070主要特性:
• Wide input voltage range from 4.5 V to 60 V
• Capable to provide up to 0.7 A average output current
• Up to 1 MHz switching frequency
• Soft-start capability
• Analog and PWM dimming possible
• Integrated PWM generator for analog dimming input
• Typical 3% output current accuracy
• Very low LED current drift over temperature
• Adjustable over-temperature protection
• Undervoltage lockout
• Over-current protection
• Thermally optimized package: PG-DSO-8-27
ILD6070應(yīng)用:
• LED driver for general lighting
• Retail, office and residential downlights
• Street and tunnel lighting
• LED ballasts
圖1. ILD6070框圖
圖2. ILD6070應(yīng)用框圖
ILD6070演示板
The demo board is configured to have an output current of 0.5 A. The operating voltage range for the demo board can be from 4.5 V up to 60 V.
圖3. ILD6070演示板電路圖
圖4. ILD6070演示板外形圖
ILD6070演示板材料清單:
圖5. ILD6070演示板PCB設(shè)計(jì)圖 |
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