LNK403-409EG设计的带TRIAC调光LED驱动技术
本文首先介绍了lnk403-409eg主要特性，功能方框图，以及triac调光和无调光的led驱动电路图。接着介绍了采用lnk403-409eg的15w triac调光单级pfc led驱动器参考设计技术指标，电路图和材料清单与变压器电路图。
linkswitch-ph 系列lnk403-409eg是powerint 公司的集成了725v功率mosfet，连续模式pwm控制器，用于自偏压的高压开关电流源，频率抖动，逐个周期的电流限制和延迟热关断电路，主要用在离线led驱动器。
lnk403-409eg产品亮点：
dramatically simplifies off-line led drivers
• flicker-free phase-controlled triac dimming
• single stage power factor corrected and accurate constant current (cc) output
• eliminates optocoupler and all secondary current control circuitry
• eliminates all control loop compensation circuitry
• simple primary-side pwm dimming interface
• universal input voltage range
• enables designs that are electrolytic-free
accurate and consistent performance
• compensates for transformer inductance tolerances
• compensates for line input voltage variations
• frequency jittering greatly reduces emi filter size and costs
advanced protection and safety features
• auto-restart for short-circuit protection
• open circuit fault detection mode
• automatic thermal shutdown restart with hysteresis
• meets high voltage creepage requirement between drain and all other signal pins both on pcb and at package
ecosmart® – energy efficient
• low standby power remote on/off feature (85% achievable
green package
• halogen free and rohs compliant package
lnk403-409eg应用：
• off-line led driver
图1。lnk403-409eg功能方框图
图2。隔离triac调光通用输入14w led驱动器电路图
图3。隔离不调光通用输入7w led驱动器电路图
采用lnk403-409eg的triac调光单级pfc led驱动器参考设计
the document describes a power factor corrected led driver designed to drive a nominal led string voltage of 50 v at 0.3 a from an input voltage range of 90 vac to 265 vac. the led driver uses the lnk406eg from the linkswitch-ph family by power integrations.
linkswitch-ph ics allow the implementation of cost effective and low component count led drivers which meet both power factor and harmonics limits; and also offer an enhanced end user experience. this includes ultra-wide dimming range (not used in this demo), flicker free operation (even with low cost ac line triac dimmers) and fast, clean turn on.
the topology used is an isolated flyback operating in continuous conduction mode. output current regulation is sensed entirely from the primary side eliminating the need for secondary side feedback components. no external current sensing is required on the primary side either as this is performed inside the ic further reducing components and losses. the internal controller adjusts the mosfet duty cycle to maintain a sinusoidal input current and therefore high power factor and low harmonic currents.
the lnk406eg also provides a sophisticated range of protection features including autorestart for open control loop and output short-circuit conditions. line overvoltage provides extended line fault and surge withstand, output overvoltage protects the supply should the load be disconnect and accurate hysteretic thermal shutdown ensures safe average pcb temperatures under all conditions.
the key goals of this design were low profile and high efficiency. this was to allow the driver board to fit into the space behind the led load board inside a t8 tube and operate with an acceptable temperature rise. this necessitated careful selection of components and mounting methods but was simpler than alternate solutions due to the low component count required for a primary side regulated linkswitch-ph design.
this document contains the led driver specification, schematic, pcb diagram, bill ofmaterials, transformer documentation and typical performance characteristics.
图4。led驱动器参考设计外形图
led驱动器参考设计主要特性：
low profile design, <10 mm component height
allows driver board to sit behind leds giving uniform illumination in a t8 replacement
tube application
superior performance and end user experience
clean monotonic start-up – no output blinking
fast start-up (<200 ms) – no perceptible delay
highly energy efficient
≥86% at 115 vac and ≥87% at 230 vac
low cost, low component count and small printed circuit board footprint solution
no current sensing required
frequency jitter for smaller, lower cost emi filter components
integrated protection and reliability features
output open circuit / output short-circuit protection with auto-recovery
line input overvoltage shutdown extends voltage withstand during line faults
auto-recovering thermal shutdown with large hysteresis protects both components
and printed circuit board
no damage during brown-out or brown-in conditions
meets iec 61000-3-2 class c harmonics and en55015 b conducted emi
led驱动器参考设计主要指标：
图5。15w led驱动器参考设计电路图
led驱动器参考设计材料清单（bom）：
图6。led驱动器参考设计变压器电路图
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linkswitch-ph 系列lnk403-409eg是powerint 公司的集成了725v功率mosfet，连续模式pwm控制器，用于自偏压的高压开关电流源，频率抖动，逐个周期的电流限制和延迟热关断电路，主要用在离线led驱动器。
lnk403-409eg产品亮点：
dramatically simplifies off-line led drivers
• flicker-free phase-controlled triac dimming
• single stage power factor corrected and accurate constant current (cc) output
• eliminates optocoupler and all secondary current control circuitry
• eliminates all control loop compensation circuitry
• simple primary-side pwm dimming interface
• universal input voltage range
• enables designs that are electrolytic-free
accurate and consistent performance
• compensates for transformer inductance tolerances
• compensates for line input voltage variations
• frequency jittering greatly reduces emi filter size and costs
advanced protection and safety features
• auto-restart for short-circuit protection
• open circuit fault detection mode
• automatic thermal shutdown restart with hysteresis
• meets high voltage creepage requirement between drain and all other signal pins both on pcb and at package
ecosmart® – energy efficient
• low standby power remote on/off feature (85% achievable
green package
• halogen free and rohs compliant package
lnk403-409eg应用：
• off-line led driver
图1。lnk403-409eg功能方框图
图2。隔离triac调光通用输入14w led驱动器电路图
图3。隔离不调光通用输入7w led驱动器电路图
采用lnk403-409eg的triac调光单级pfc led驱动器参考设计
the document describes a power factor corrected led driver designed to drive a nominal led string voltage of 50 v at 0.3 a from an input voltage range of 90 vac to 265 vac. the led driver uses the lnk406eg from the linkswitch-ph family by power integrations.
linkswitch-ph ics allow the implementation of cost effective and low component count led drivers which meet both power factor and harmonics limits; and also offer an enhanced end user experience. this includes ultra-wide dimming range (not used in this demo), flicker free operation (even with low cost ac line triac dimmers) and fast, clean turn on.
the topology used is an isolated flyback operating in continuous conduction mode. output current regulation is sensed entirely from the primary side eliminating the need for secondary side feedback components. no external current sensing is required on the primary side either as this is performed inside the ic further reducing components and losses. the internal controller adjusts the mosfet duty cycle to maintain a sinusoidal input current and therefore high power factor and low harmonic currents.
the lnk406eg also provides a sophisticated range of protection features including autorestart for open control loop and output short-circuit conditions. line overvoltage provides extended line fault and surge withstand, output overvoltage protects the supply should the load be disconnect and accurate hysteretic thermal shutdown ensures safe average pcb temperatures under all conditions.
the key goals of this design were low profile and high efficiency. this was to allow the driver board to fit into the space behind the led load board inside a t8 tube and operate with an acceptable temperature rise. this necessitated careful selection of components and mounting methods but was simpler than alternate solutions due to the low component count required for a primary side regulated linkswitch-ph design.
this document contains the led driver specification, schematic, pcb diagram, bill ofmaterials, transformer documentation and typical performance characteristics.
图4。led驱动器参考设计外形图
led驱动器参考设计主要特性：
low profile design, <10 mm component height
allows driver board to sit behind leds giving uniform illumination in a t8 replacement
tube application
superior performance and end user experience
clean monotonic start-up – no output blinking
fast start-up (<200 ms) – no perceptible delay
highly energy efficient
≥86% at 115 vac and ≥87% at 230 vac
low cost, low component count and small printed circuit board footprint solution
no current sensing required
frequency jitter for smaller, lower cost emi filter components
integrated protection and reliability features
output open circuit / output short-circuit protection with auto-recovery
line input overvoltage shutdown extends voltage withstand during line faults
auto-recovering thermal shutdown with large hysteresis protects both components
and printed circuit board
no damage during brown-out or brown-in conditions
meets iec 61000-3-2 class c harmonics and en55015 b conducted emi
led驱动器参考设计主要指标：
图5。15w led驱动器参考设计电路图
led驱动器参考设计材料清单（bom）：
图6。led驱动器参考设计变压器电路图
CXL的特点和优势，以及三星CXL存储器扩展器和开源CXL软件
ZLDS103超小尺寸激光位移传感器测量管道内径
电路设计软件有哪些_电路图设计软件哪种最好_手机绘制电路图软件
公共汽车关门自动通报器(555、KD153、KD28)
谷歌发布又一AI大模型黑科技丨小美AI城APP带你开启AI新时代
LNK403-409EG设计的带TRIAC调光LED驱动技术
DS2408 8通道、可编程I/O 1-Wire IC
联发科HelioP60的12nm工艺制程对标高通骁龙660
【回顾往年CES】中国手机品牌——奇酷亮相展会，吸引各界目光
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低功耗产品的关键组件是设计师
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网信安全比芯片更不能被卡脖子
双王相争 谁能在未来半导体研发制造上更胜一筹
什么是信号完整性？为什么我平时的工作没有接触到信号完整性？
窄边框，全金属 3000元能买到的高颜值手机，vivo X9Plus第一你有意见？
联发科天玑游戏引擎打造游戏体验标杆，质疑性能的可以闭嘴了
小米MAX2什么时候上市？小米MAX2最新消息：6.4寸巨屏，5000毫安大电池！
屏下摄像头下半年很难大规模量产 真全面屏未能实现
升压IC之SX1308的SX1308应用电路图与SX1308升压电路图