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[原创] Infineon ILD8150 80V降压LED驱动参考设计方案

关键词:电源管理 DC/DC转换器 LED驱动器

时间:2019-06-27 11:22:47       来源:中电网

infineon公司的ILD8150/ILD8150E是用来驱动大功率LED的80V DC/DC转换器,平均电流高达1.5A,具有一个引脚进行模拟调光和PWM调光的混合调光LED方法.PWM输入信号在250Hz和20kHz,模拟模式控制LED电流从100%到12.5%,混合模式控制LED电流从12.5%到0.5%,无闪烁调频频率3.4kHz.高分辨率的数字调光检测使得能和微控制器完美匹配,并具有高质量调光应用.ILD8150/ILD8150E集成了具有低RON的80V高边MOSFET,逐个周期电流限制,并具有欠压锁住,超温保护等特性,无闪烁等特性,下拉晶体管可避免LED发出暗淡的光.工作电压8V-80V.主要用在LED照明的电子控制装置(ECG).本文介绍了ILD8150/ILD8150E主要特性,框图和DC/DC降压恒流电路图,以及80V高边降压驱动器参考设计主要特性,电路图,材料清单和PCB设计图.

The ILD8150 is a 80 V DC/DC converter IC for LED applications to drive high-power LEDs. For applicationsoperating close to SELV limits it provides a high safety voltage margin. The buck LED driver IC is tailored forLEDs in general lighting applications with average currents up to 1.5 A using a high-side integrated switch. Acomplete set of features and protections provide a well fit for professional LED lighting solutions.

Performance and innovation

The hysteretic current control provides an extremely fast regulation and stable LED current combined with goodEMI performance. The efficiency of the LED driver is remarkable high due to the low RON of the internal switch.

Hybrid dimming is an Infineon unique one-pin dimming method that combines analog dimming and PWMdimming of the LEDs current in one hybrid dimming curve.

A PWM input signal between 250 Hz and 20 kHz controls dimming of the LEDs current in analog mode from 100percent to 12.5 percent and 12.5 percent to 0.5 percent in hybrid mode with flicker-free modulation frequencyof 3.4 kHz. The digital PWM dimming detection with high resolution makes it the perfect match formicrocontroller and high quality dimming applications.

The IC supply is directly driven from the primary stage and the low-power shut down contributes to a very highstand-by system efficiency.

High output current accuracy from device to device under all loads and input voltages conditions makes itperfect for tunable white and flat panel designs where current must be identical string to string.

Protection

A wide range of operating supply voltage from 8 V to 80 V DC enables a wide use in many applications andprovides a good margin when bus voltage exceeds shortly the SELV limits.

The soft-start function protects the primary stage from abrupt current request.The over temperature protection is triggered when the junction temperature exceeds the temperaturethreshold turning off the output stage. The output stage turns on again when the junction temperature fallsbelow the temperature threshold.

Under voltage lock-out protects the bootstrap voltage and the hysteretic design ensures cycle-by-cycle currentlimitation.

ILD8150主要特性:

• DC/DC buck with hysteretic current regulation
• Output current up to 1.5 A DC
• Integrated 80 V high-side MOSFET switch with low RON
• Hybrid dimming to 0.5% of the target current
• Wide operating voltage range 8 V to 80 V
• Cycle-by-cycle current limitation
• Under-voltage lockout
• Thermal protection
• Flicker free operation
• Digital soft-start
• Pull-down transistor to avoid LED glowing

ILD8150目标应用:

• Electronic Control Gear (ECG) for LED luminaries

图1.ILD8150框图

图2.ILD8150 DC/DC降压恒流电路图

ILD815080V高边降压驱动器应用电路

This application note introduces Infineon’s hysteretic high-side MOSFET buck DC-DC LED driver IC ILD8150 for general lighting applications. It describes the device operation, features and component value calculations and selection. An example of the reference design performance is shown. ILD8150 provides a highly efficient solution up to 97 percent with superior hybrid dimming performance, and various protections such as cycle-by-cycle current limitation and over-temperature protection.

This application note explains the operation of Infineon’s high-side MOSFET buck LED driver IC ILD8150. ILD8150 provides a highly efficient solution, with multiple protection features, superior hybrid PWM dimming performance and high accuracy across all conditions–input/output voltage, dimming and temperature.

ILD8150 is a next-generation buck DC-DC LED driver recommended for general LED lighting. The target application is a secondary stage together with AC-DC such as Power Factor Correction (PFC) flyback or PFC + LLC. ILD8150 is flexible enough to use up to 1.5 A. The hysteretic current control is extremely fast and always stable without the need for any loop compensation. A maximum duty cycle of up to 99 percent enables use in applications where the input and output voltage are close to each other. It is suitable for applications with a wide range of supply voltages from 8 V to 80 V, which gives flexibility and a clear advantage over existing 60 V solutions.

ILD8150 operates in hybrid dimming mode, which helps to minimize LED color shift and audible noise. In the range 12.5 to 100 percent it operates in analog dimming mode, and from 0.5 to 12.5 percent in PWM mode with fixed output frequency fout.

ILD8150 provides high accuracy across all conditions, as well AC 100 or 120 Hz input flicker rejection across the whole dimming range.

80V高边降压驱动器应用电路主要特性:

 Wide input voltage range from 8 V to 80 V
 Capable of providing output current up to 1.5 A
 Up to 2 MHz switching frequency
 Digital soft-start
 PWM dimming input up to 20 kHz
 Hybrid output dimming
 Typical ±3 percent output current accuracy
 Very low LED current drift over-temperature
 Under-Voltage Lockout (UVLO)
 Cycle-by-cycle current limitation
 Shut-down mode with low self-consumption
 PG-DSO-8 package with and without exposed pad
 Over-Temperature Protection (OTP)

80V高边降压驱动器应用电路应用:

 LED driver for general lighting
− with single output channel
− with two output channels for tuneable white light
 LED driver for horticultural lighting
− with multiple output channels

图3.80V高边降压驱动器参考设计外形图(尺寸82(L)x26(W)x16(H)mm

图4.微控制器使用图

图5.80V高边降压驱动器参考设计电路图
80V高边降压驱动器参考设计材料清单:



图6.80V高边降压驱动器参考设计PCB设计图
详情请见:
https://www.infineon.com/dgdl/Infineon-Datasheet_ILD8150_V1.0-DS-v01_00-EN.pdf?fileId=5546d462696dbf120169ba96613f4c20
https://www.infineon.com/dgdl/Infineon-ApplicationNote_reference_design_REF_ILD8150_DC_1.5A_LightingICs_LED_driver-AN-v01_00-EN.pdf?fileId=5546d462689a790c0168c39bfda86810
Infineon-Datasheet_ILD8150_V1.0-DS-v01_00-EN.pdf
Infineon-ApplicationNote_reference_design_REF_ILD8150_DC_1.5A_LightingICs_LED_driver-AN-v01_00-EN.pdf

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