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STLUX385A 100W LED街燈照明解決方案

文章來源：更新時間：2014/5/15 12:39:00

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ST公司的STLUX385A是用于照明和電源轉換的數(shù)字器件STLUX系列產(chǎn)品,集成了各種架構和應用功能,包括用來驅動多個LED串的降壓轉換器,用于PFC的升壓轉換器,用于大功率可調(diào)光LED串的半橋諧振轉換器和用于HID燈的全橋控制器.本文介紹了STLUX385A主要特性,內(nèi)部框圖和內(nèi)部設計圖,以及100W LED街燈照明演示板STEVAL385LEDPSR主要特性,電路圖和材料清單.
The STLUX385A device is part of the STLUX™ family of STMicroelectronics® digital devices tailored for lighting and power conversion applications. The STLUX385A has been successfully integrated in a wide range of architectures and applications, starting from simple buck converters for driving multiple LED strings, boost for power factor corrections, half-bridge resonant converters for high power dimmable LED strings and up to full bridge controllers for HID lamp ballasts.
The heart of the STLUX385A device is the SMED (state machine event driven) technology which allows the device to operate six independently configurable PWM clocks with a maximum resolution of 1.3 ns. A SMED is a powerful autonomous state machine, which is programmed to react to both external and internal events and may evolve without any software intervention. The SMED reaction time can be as low as 10.4 ns, giving the STLUX385A the ability of operating in time critical applications. The SMED offers superior performance when compared to traditional, timer based, PWM generators.
Each SMED is configured via the STLUX385A internal microcontroller. The integrated controller extends the STLUX385A reliability and guarantees more than 15 years of both operating lifetime and memory data retention for program and data memory after cycling.
A set of dedicated peripherals complete the STLUX385A:
 4 analog comparators with configurable references and 50 ns max. propagation delay.
It is ideal to implement zero current detection algorithms or detect current peaks.
 10-bit ADC with configurable op amp and 8-channel sequencer.
 DALI: hardware interface that provides full IEC 60929 and IEC 62386 slave interface.
 96 MHz PLL for high output signal resolution.

STLUX385A主要特性:
 6 programmable PWM generators (SMEDs) (state machine event driven)
– 10 ns event detection and reaction
– Max.1.3 ns PWM resolution
– Single, coupled and two coupled operational modes
– Up to 3 internal/external events per SMED  DALI (digital addressable lighting interface)
– Interrupt driven hardware encoder
– Bus frequency: 1.2, 2.4 or 4.8 kHz
– IEC 60929 and IEC 62386 compliant plus 24-bit frame extension
– Configurable noise rejection filter
– Reverse polarity on Tx/Rx lines
 4 analog comparators
– 4 internal 4-bit references
– 1 external reference
– Less than 50 ns propagation time
– Continuous comparison cycle  8 analog-to-digital converters (ADCs)
– 10-bit precision, with operational amplifier to extend resolution to 12-bit equivalent
– Sequencer functionality
– Input impedance: 1 M
– Configurable gain value: x 1 or x 4
 Integrated microcontroller
– Advanced STM8® core with Harvard architecture and 3-stage pipeline
– Max. fCPU: 16 MHz
 Memories
– Flash and E2PROM with read while write (RWW) and error correction code (ECC)
– Program memory: 32 Kbytes Flash; data retention 15 years at 85 ℃ after 10 kcycles at 25 ℃
– Data memory: 1 Kbyte true data E2PROM; data retention:15 years at 85 ℃ after 100 kcycles at 85 ℃– RAM: 2 Kbytes
– ROM: 2 Kbytes
 Clock management
– Internal 96 MHz PLL
– Low-power oscillator circuit for external crystal resonator or direct clock input
– Internal, user-trimmable 16 MHz RC and low-power 153.6 kHz RC oscillators
– Clock security system with clock monitor
 Basic peripherals
– System and auxiliary timers
– IWDG/WWDG watchdog, AWU, ITC
 Reset and supply management
– Multiple low-power modes (wait, slow, autowakeup, Halt) with user definable clock gating
– Low consumption power-on and powerdown reset
 I/O
– 12 multifunction bidirectional GPIO with highly robust design, immune against current injection
– 6 fast digital input DIGIN, with configurable pull-up
 Communication interfaces
– UART asynchronous with SW flow control
– I2C master/slave fast-slow speed rate
 Operating temperature
– -40 ℃ up to 105 ℃.

圖1. STLUX385A內(nèi)部框圖

圖2. STLUX385A內(nèi)部設計框圖

100W LED街燈照明演示板STEVAL385LEDPSR
The STEVAL385LEDPSR demonstration board is a complete and configurable solution that efficiently controls a single dimmable high brightness LED string using the STLUX385A digital controller.
The LED efficiency is high during all stages of dimming and the STEVAL385LEDPSR can achieve a 92% efficiency during full load while maintaining a low < 200 mW power consumption during idle periods.
The STLUX385A device handles a primary side regulated power conversion stage as well as all the supported communication links.
The power conversion stage consists of a PFC regulator followed by a “Zero Voltage Switching”(ZVS) LC resonant stage. The high precision dimming is adjusted using a primary side regulation (PSR) control technique.
The LED brightness can be dimmed by controlling the LED current down to a very low level.
The STEVAL385LEDPSR demonstration board provides all the physical communication interfaces such as a DALI, insulated 0-10 and UART. All the communication is managed by the STLUX385A device. The UART interface and STLUX385A flexibility allow to quickly connect the STEVAL385LEDPSR to alternative interfaces such as Wi-Fi, power line modems, Bluetooth® and Zigbee®

STEVAL385LEDPSR主要特性:
 STLUX385A based
 High efficiency (92%)
 Primary side controlled
 Up to 100 W (100 V at 1 A or 200 V at 0.5 A)
 Single isolated output suitable for LED connection.
 Wide input voltage range: 90 V to 265 V AC
 Adjustable LED current and dimming
 Output resolution: 11-bit equivalent.
 IDLE mode power consumption: < 200 mW
 Real-time fault detection and protection (e. g.: short- or open circuit)
 Remote control via DALI,0 - 10 V,UART