ST STCMB1150V-150W LED驱动器解决方案

ST公司的STCMB1是集成了转换(TM)模式PFC和半桥谐振LLC高压双端控制器,耐压800V的高压线路以及控制管理线路.PFC部分采用专有的恒定实时控制方法,不需要正弦输入基准,因此降低了系统成本和外接元件数量.它包括完整的保护特性如逐个周期的过流保护(OCP),输出过压保护(OVP)和反馈失败(FFP,锁存模式),AC电压降低,在起动时和电源下降或缺失周期后的升压电感饱和过充电流检测.半桥(HB)部分提供两个互补输出,180°反相驱动高边和低边MOSFET,在一个开关关断而另一个开关接通时间插入死区,这是自动调整的,以保证开关切换时零电压,从而获得低到满负载时的更高效率.而专有的控制方法, 时移控制(TSC),改善了动态性能和输入波纹抑制,使得输出波形更加清澈.主要用在AC/DC适配器,开框开关电源(SMPS), LED
TV,台式电脑和全合一PC的开关电源,和节能兼容的消费类电子和工业SMPS,以及其LED街区照明. 中电网为您整理如下详细资料,本文介绍了STCMB1主要特性,框图和系统框图,典型应用电路和评估板EVL150W-HVSL(150V-150W LED驱动器)主要特性,电路图和材料清单以及扩展火线输入电压(85 ÷ 300 Vac)电路图和欧洲输入火线电压(195 ÷ 265 Vac)电路图.
The STCMB1 device embodies a transition mode (TM) PFC, a high
voltage double-ended controller for LLC resonant half-bridge, an 800 V-rated high voltage section and the glue logic that supervises the operation of these three blocks.
The PFC section uses a proprietary constant on-time control
methodology that does not require a sinusoidal input reference, thereby reducing the system cost and external component count.
It includes also a complete set of protections: a cycle-by-cycle
overcurrent (OCP), an outputovervoltage (OVP), a feedback failure (FFP,
latch-mode), an ac brown-out, boost inductorsaturation and inrush current detection both at the start-up and after mains sags or missingcycles.
The half-bridge (HB) section provides two complementary outputs that drive the high-side and low-side MOSFET 180° out-of-phase. The deadtime inserted between the turn-off of aneither switch and the turn-on of the
other is automatically adjusted to ensure zero voltageswitching and higher efficiency from low to full load.
A proprietary control method, timeshift control - TSC, improves
dynamic behavior and inputripple rejection resulting in a cleaner output
voltage.
At the light-load the IC can be forced to enter a controlled burst mode operation where boththe HB and the PFC work intermittently synchronized one to another. This helps to reducethe average switching frequency, thus keeping converter input consumption as low aspossible.
At the start-up, in addition to the traditional soft-start based on the
frequency-shift, aproprietary hard switching prevention (HSP) function
controls the half-bridge to prevent hardswitching in the initial cycles.
Additionally, the HSP function prevents the converter fromworking in or
too close to the capacitive mode to ensure soft-switching.
ST STCMB1150V－150W LED驱动器解决方案
The HB is provided with a two-level OCP. The first level is with the
frequency shift and delayed shutdown with an automatic restart. A fast shutdown with an automatic restart occurs if this first-level protection
cannot limit the primary current. Finally, the deviceembeds the logic
circuitry to coordinate the operation of the PFC, HB and HV start-upgenerator; in particular: the power-on/off sequencing, X-capacitor
discharge, fault handlingand synchronous burst mode operation. For the application debug purposes it is possible toexternally disable one section at a time and have the other section working standalone.
STCMB1主要特性:
Common features
–SO20W package
–800 V high voltage start-up with integratedinput voltage sensing –Active input filter capacitor dischargecircuitry for reduced standby
powercompliant with IEC 62368-1 and UL Demkocertified
–Independent debug mode for bothconverters
PFC controller features
–Enhanced constant on-time PFC with inputvoltage feedforward, THD optimizer
–
Complete set of protections: ac brownin/out, inrush control, OVP, OCP, inductor saturation, feedback disconnection
LLC controller features
–Proprietary timeshift control for improvedinput ripple rejection and dynamicresponse
–Half-bridge operation up to 750 kHz withself-adjusting deadtime –Complete set of protections: dc brown-out,two-level OCP, hard
switching prevention (HSP) function for anti-capacitive
modeprotection and safe start-up
–Synchronous burst mode operation withPFC enhances light-load efficiency
STCMB1应用:
Ac-dc adapter, open frame SMPS
SMPS for LED TV, desktop and all-in-one PC
Consumer and industrial SMPS compliant with“Energy Using
Product” directive (EuP) Lot 6,DOE and European CoC ver. 5, Tier 2 LED street lighting
图1.STCMB1框图
图2.STCMB1系统框图
图3.STCMB1的HB谐振控制器框图
图4.STCMB1典型应用电路图
评估板EVL150W-HVSL:150V-150W LED 驱动器
150 V – 150 W LED driver using the STCMB1 transition mode PFC and HBR resonant tank combo controller.
The growing popularity of LEDs, thanks to their high efficiency and longer lifetime, are greatly contributing to the reduction of energy consumption for internal and external lighting.
Street lighting applications require a power supply specifically designed to power an LED lamp having high efficiency and a long lifetime in order to guarantee maintenance-free operation during the lifetime of the LED.
This application note describes the performance of a 150 W, wide input mains range, powerfactor-corrected, LED driver board. Its electrical specification is tailored to a typical highpowerstreet lighting application.
The architecture is based on a two-stage approach: a front-end PFC pre-regulator and a downstream resonant half-bridge converter: both are using the new STCMB1 embedded inthe same device; a PFC and a resonant controller. Thanks to the STCMB1, the main features of this design are high efficiency, very low no-load input power consumption,reduced harmonics compliant with the EN61000-3-2 Class-C, and EMI within the relevant EN55022 limits.
Another noticeable feature of this LED driver is the extremely wide dimming capability;actually the board can regulate the current from the maximum level down to less than 10% with analog dimming and to 1% in PWM dimming. The PWM dimming is perfectly flicker free, because even in the case of a very low current it is kept continuous (DC) in the LED and thus independent of the frequency of the PWM dimming signal.
The board also has protection features in the case of an overload, short-circuit, and open loop by each section. For this particular application, all protections in the case of intervention have an auto-restart functionality.
图5.评估板EVL150W-HVSL(150V-150W LED 驱动器)外形图。