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| 文章來源： 更新時間：2014/11/12 9:27:00 |
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ST公司的STLUX385A是用于照明和電源轉(zhuǎn)換的具有六個PWM發(fā)生器,96MHz PLL和DALI的數(shù)字控制器.器件集成了各種架構(gòu)和應(yīng)用,如驅(qū)動多個LED串的降壓轉(zhuǎn)換器,用于PFC的升壓轉(zhuǎn)換器,用于大功率可調(diào)光LED串的半橋諧振轉(zhuǎn)換器和用于HID燈鎮(zhèn)流器的全橋控制器.本文介紹了STLUX385A主要特性,內(nèi)部框圖,以及基于STLUX385A的150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1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
基于STLUX385A的150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1
The STEVAL-ILH007V1 product evaluation board is a 150 W high intensity discharge (HID) digital ballast platform for testing the STLUX385A digital controller.
This solution is designed to drive sodium and metal halide HID lamps. The board is composed of two stages, the power factor corrector (PFC) and the inverter.
The PFC is based on a boost topology to correct the AC input current in phase with the AC voltage mains. The inverter is based on a full bridge topology to drive the lamps. The STLUX385A digital controller drives both stages.
The STLUX385A is part of the ST’s MASTERLUX™ family of digital devices tailored to lighting and power conversion applications.
The MCU has a 16 MHZ CPU frequency, 32 Kbytes of program memory and 2 Kbytes of RAM.
150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1主要特性:
VIN= 185 - 265 V
Eff (VIN= 230 V, load = 150 W) = 90% min
PF (VIN=185 V; load = 150 W) = 0.98
THD (VIN=185 V; load = 150 W) = 10%
Load lamp type: sodium or metal halide
POUT= 150 W
IOUT= 1.6 A
RoHS compliant
圖2. 150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1外形圖
圖3. 150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1電路圖(1)
圖4. 150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1電路圖(2)
150W HID數(shù)字鎮(zhèn)流器STEVAL-ILH007V1材料清單:
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