Infineon TLD5542-1 H桥DC-DC控制器解决方案
原标题:Infineon TLD5542-1 H桥DC-DC控制器解决方案
infineon公司的TLD5542-1是内置了保护特性和SPI接口的 H桥DC/DC控制器,可以用于驱动大功率LED,具有最高的系统效率(高达96%)和最少数量外接元件. TLD5542-1提供模拟和数字(PWM)调光.开关频率在200 kHz 到700 kHz间可调,并与外接时钟源同步.内置可编广谱开关频率调制和强制连续电流调整模式改善了整个EMC性能.此外,电流模式调整方案提供了稳定的回路,而可调软起动特性限制了起动时电流峰值和电压过冲.TLD5542-1是单电感大功率降压-升压控制器,LED正向电压从2V到55V,工作电源4.5V到55V,VIN输入范围4.5V-40V.SPI接口用来诊断和控制,可驱动多个负载,故障模式具有跛行模式功能.特别设计用来驱动多个大功率LED,汽车外部照明和通用DC/DC电压稳压器.本文介绍了TLD5542-1主要特性包括保护特性,诊断特性和跛行模式功能,框图,稳压器框图和保护,诊断和监视框图,以及应用电路框图, TLD5542-1多路评估板 V4.4电特性表,电路图和PCB设计图.
The TLD5542-1 is a synchronous MOSFET H-Bridge DC/DC controller with built in protection features and SPI interface. This concept is beneficial for driving high power LEDs with maximum system efficiency and minimum number of external components.
The TLD5542-1 offers both analog and digital (PWM) dimming. The switching frequency is adjustable in the range of 200 kHz to 700 kHz. It can be synchronized to an external clock source. A built in programable Spread Spectrum switching frequency modulation and the forced continuous current regulation mode improve the overall EMC behavior. Furthermore the current mode regulation scheme provides a stable regulation loop maintained by small external compensation components. The adjustable soft start feature limits the current peak as well as voltage overshoot at start-up.
The TLD5542-1 is suitable for use in the harsh automotive environment.
TLD5542-1主要特性:
• Single inductor high power Buck-Boost controller
• Wide LED forward voltage range (2 V up to 55 V)
• Wide VIN range (IC 4.5 V to 40 V, power 4.5 V to 55 V)
• Switching frequency range from 200 kHz to 700 kHz
• SPI for diagnostics and control
• Maximum efficiency in every condition (up to 96%)
• Constant current (LED) and constant voltage regulation
• Drives multiple loads with a single IC thanks to the Fast Output Discharge operation
• Limp Home function (fail safe mode)
• EMC optimized device: features an Auto Spread Spectrum
• LED and input current sense with dedicated monitor outputs
• Advanced protection features for device and load
• Enhanced dimming features: Analog and PWM dimming
• LED current accuracy +/- 3%
• Available in a small thermally enhanced PG-VQFN-48 or PG-TQFP-48 package
• Automotive AEC Qualified
TLD5542-1保护特性:
• Over load protection of external MOSFETs
• Shorted load, output overvoltage protection
• Input undervoltage protection
• Thermal shutdown of device with autorestart behavior
• Electrostatic discharge protection (ESD)
TLD5542-1诊断特性:
• Latched diagnostic information via SPI
• Device Overtemperature shutdown and Temperature Prewarning
• Smart monitoring and advanced functions provide ILED and IIN information
TLD5542-1跛行模式功能:
• Limp Home activation via LHI pin
TLD5542-1应用:
• Especially designed for driving multiple high power LED functions (I.E. Low Beam, High Beam, DRL)
• Automotive Exterior Lighting: full LED headlamp assemblies
• General purpose DC/DC voltage regulator
图1. TLD5542-1框图
图2. TLD5542-1稳压器框图
图3. TLD5542-1保护,诊断和监视框图
图4. TLD5542-1应用框图:电流稳流器
图5. TLD5542-1应用框图:改进EMC性能
图6. TLD5542-1应用框图:三功能LED驱动器模块
图7. TLD5542-1应用框图:可调电压稳压器
TLD5542-1多路评估板
The TLD5542-1 multichannel evalboard V4.4 it is an evaluation platform for the TLD5542-1, which can drive 3 LED functions (HB, LB, DRL), with a single efficient DC/DC converter.
In the single DC/DC multichannel system night-time functions (e.g. HB and LB) are connected in series and the complementary daytime (DRL) function in parallel by mean of switches (Figure 2). The switches properly distribute the DC/DC converter output current in order to obtain the requested LED currents. This approach is called multi floating switch (MFS) architecture.
The TLD5542-1 Multichannel evalboard V4.4 it is an evaluation platform for the TLD5542-1, which can drive 3 LED functions (HB, LB, DRL), with a single efficient DC/DC converter. The board shows good EMC performance, EMC report available for download on the evaluation board webpage.
图8. LED驱动器三功能MFS架构图
图9.TLD5542-1多路评估板 V4.4外形图
On the board, in addition the following are present:
A 300 mA LS switch to drive an external FAN
Limp Home push button show fail safe operation
Extra push button whose functionality can be programmed by the user
LIN interface and a detachable USB serial to LIN daughter board
责任编辑:David
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