TLD5098汽车内外LED照明TLD5098主要特性和解决方案 |电子通-应用新知，新电子的助推者电子通

Infineon公司的TLD5098是内置了保护特性的LED升压控制器,可以调节恒定LED电流,以保证LED色彩精度和有较长寿命.器件具有多种配置如升压,降压,降-升压,SPEIC和反激等.输入电压从4.5V到45V,开关频率从100 kHz到500 kHz,具有多种保护功能,主要用在汽车内外照明.本文介绍了TLD5098主要特性,框图,多种配置下的应用电路和相应的材料清单,以及LITIX™ Power TLD5098EL应用板主要特性,电路图和材料清单.

The TLD5098EL is a LED boost controller with built in protecTIon features. The main funcTIon of this device is to regulatea constant LED current. The constant current regulaTIon is especially beneficial for LED color accuracy and longer lifetime.

The controller concept of the TLD5098EL allows multiple configurations such as Boost, Buck, Buck-Boost, SEPIC andFlyback by simply adjusting the external components. The TLD5098EL offers the most flexible dimming options. Dimmingcan be achieved with analog or PWM input.The switching frequency is adjustable in the range of 100 kHz to 500 kHz andcan be synchronized to an external clock source. The TLD5098EL features an enable function reducing the shut-downcurrent consumption to Iq_OFF< 10 μA. The current mode regulation scheme of this device provides a stable regulationloop maintained by small external compensation components. The integrated soft start feature limits the current peak aswell as voltage overshoot at start-up. This IC is suited for use in the harsh automotive environments and provides outputovervoltage protection, device overtemperature shutdown and short circuit to GND protection.

TLD5098主要特性:

• Wide Input Voltage Range from 4.5 V to 45 V
• Constant Current or Constant Voltage Regulation
• Drives LEDs in Boost, Buck, Buck-Boost, SEPIC and FlybackTopology
• Very Low Shutdown Current: Iq_OFF< 10 μA
• Flexible Switching Frequency Range, 100 kHz to 500 kHz
• Synchronization with external clock source
• PWM Dimming
• Analog Dimming feature to adjust average LED current
• Internal 5 V Low Drop Out Voltage Regulator
• Open Circuit Detection
• Short to GND Protection
• Output Overvoltage Protection
• Internal Soft Start
• Over Temperature Shutdown
• Wide LED current range via simple adaptation of external components
• 300mV High Side Current Sense to ensure highest flexibility and LED current accuracy
• Available in a small thermally enhanced PG-SSOP-14 package
• Automotive AEC Qualified
• Green Product (RoHS) Compliant

TLD5098应用:

• Automotive Exterior and Interior Lighting

图1.TLD5098框图

图2. TLD5098应用电路图:B2G配置
图2应用电路材料清单:

图3. TLD5098 SEPIC应用电路图:降压-升压配置
图3 TLD5098 SEPIC应用电路材料清单:

图4. TLD5098反激应用电路图:降压-升压配置
图4 TLD5098反激应用电路材料清单:

图5. TLD5098升压-电池应用电路图:B2B(降压-升压配置)
图5TLD5098升压-电池应用电路图材料清单:

图6. TLD5098降压应用电路图
图6 TLD5098降压应用电路图材料清单:

图7. TLD5098升压应用电路图
图7 TLD5098升压应用电路图材料清单:

LITIX™ Power TLD5098EL应用板

The size of the application boards is 4.5 cm x 4 cm and the connections to the power supply and external load can be established with cables.

The application boards in combination with real loads enable fast and realistic application prototyping and could be very beneficial for constructing initial system demonstrators.

The layout of these boards is optimized for EMC and can be reused for customer applications.