TI TPS92310离线大功率LED驱动解决方案

关键词： LED驱动 , TI , TPS92310 , 离线

TI 公司的TPS92310是离线初级侧检测带PFC的控制器,设计用来照明的大功率LED驱动器,采用恒定的导通时间和准谐振开关技术,具有高的功率系数,良好的EMI行能和高的系统效率.主要用在A19 (E26/27, E14), PAR30/38和GU10型LED灯与固态照明.本文介绍了TPS92310主要特性,方框图,典型应用电路图,隔离和非隔离拓扑的电路图,以及TPS92310 EVM-8W评估模块主要特性,电路图,材料清单和模块PCB元件布局图.

TPS92310: Off-Line Primary Side Sensing Controller with PFC

The TPS92310 is an off-line controller specifically designed to drive high power LEDs for lighting applications. With the primary side sensing, constant on-time and quasi-resonant switching techniques, the TPS92310 application circuit gives high Power Factor, good EMI performance and high system efficiency. Also, using this device, low external component count application solutions can be designed easily. Power Factor Correction is inherent if the TPS92310 is operated in the constant on-time mode with an adaptive algorithm. The control algorithm of TPS92310 adjusts the on-time with reference to the primary side inductor peak current and secondary side inductor discharge time dynamically, the response time of which is set by an external capacitor. Also, minimized EMI and switching loss is achieved with quasi-resonant switching. Other supervisory features of the TPS92310 include cycle-by-cycle primary side inductor current limit, VCC under-voltage lockout, output over-voltage protection and thermal shutdown. The TPS92310 is available in the MSOP-10 package.

TPS92310主要特性:

■ Regulates LED current without secondary side sensing

■ Adaptive ON-time control with inherent PFC

■ Critical-Conduction-Mode (CRM) with Zero-Current Detection (ZCD) for valley switching

■ Programmable switch turn ON delay

■ Programmable Constant ON-Time (COT) and Peak Current Control

■ Over-temperature protection

TPS92310应用:

■ LED Lamps: A19 (E26/27, E14), PAR30/38, GU10

■ Solid State Lighting

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图1.TPS92310方框图

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图2.TPS92310典型应用电路图

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图3.TPS92310隔离拓扑电路图

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图4.TPS92310非隔离拓扑电路图

TPS92310 EVM-8W评估模块

The TPS92310 EVM-8W evaluation module is a constant current output LED driver supporting 5W to 8W applications.

The design focuses on applications that require small form factor and minimal number of external components. The actual PCB dimension of the module is only 22mm x 55mm x 19mm (L x W x H). The module can work with AC line input from 90 to 132VRMS or 180 to 264VRMS and supplying 350mA current into a single string of LEDs, typically 6-7 LEDs in series.

The evaluation board is carefully designed to comply with major industrial EMC and safety requirements. The user can make use of the information provided in this document, TPS92310 datasheet and application notes to design its specific end product easily.

The TPS92310 EVM-8W is developed with the TPS92310 controller IC. The TPS92310 is a single-stage AC/DC controller dedicated for LED Lighting applications. The controller uses a primary-side current sense configuration to control the LED current at secondly side. The system works in Critical Conduction Mode (CRM) with flyback topology and it employs a constant on time modulation scheme. Inherently, systems with this configuration can achieve greater than 0.90 Power Factor (PF) easily. The Power Factor (PF) and line current harmonic performances of the evaluation board are tested and reported in this document. The TPS92310 also integrated various protection features: Over-Voltage Protection (OVP), Thermal Shut Down (TSD) and cycle-by-cycle Over-Current Protection (OCP). With these features in place, the system is well protected against open and short circuit of the LEDs string. Considering with the EMI problem, the TPS92310 integrates an internal delay timer to improve it. The delay time can be programmed through an external resistor, it can ensures the controller switch ON the MOSFET only when the MOSFET’s drain voltage at its lowest point. The Quasi-resonant switching operation improves the EMI and system efficiency significantly.

TPS92310 EVM-8W评估模块典型应用:

LED Lamps:

• A19 (E26/27, E14)

• PAR30/38

• GU10

Domestic and Office SSL solutions:

• Down Light

• LED Panel Light

• Ceiling Lamp Troffer

• T8 Tube

TPS92310 EVM-8W评估模块主要特性:

• Application input voltage: 90VRMS-132VRMS or 180VRMS-264VRMS

• Primary side Fly-back LED current regulation

• Adaptive ON-time control with inherent PFC

• Critcal-Conduction-Mode (CRM) with Zero-Current Detect (ZCD) for valley switching

• Quasi-resonant switching to benefit the EMI and efficiency

• Programmable FET Switch-On-Delay

• Constant ON-Time (COT) and Peak Current Mode (PCM)

• LED current setting with external sense resistor

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