Infineon's TLD5098 is a built-in protection LED boost controller that regulates constant LED current to ensure LED color accuracy and long life. The device has multiple configurations such as boost, buck, and drop-boost. SPEIC and flyback, etc. Input voltage from 4.5V to 45V, switching frequency from 100 kHz to 500 kHz, with a variety of protection functions, mainly used in automotive interior and exterior lighting. This article describes the main features of TLD5098, block diagram, a variety of configurations Application circuit and corresponding bill of materials, as well as main features, circuit diagrams and bill of materials for the LITIXTM Power TLD5098EL application board.
The TLC5098EL 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 The TLD5098EL features an enable function reducing the shut-downcurrent consumption to Iq_OFF< 10 μA. The current mode regulation scheme of the device provides a stable regulation loop maintained. 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 output overvoltage protection, device overtemperature shutdown and short circuit to GND protection.
• 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 automotive enhanced PG-SSOP-14 package
• Automotive AEC Qualified
• Green Product (RoHS) Compliant
• Automotive Exterior and Interior Lighting
Figure 1. Block diagram of TLD5098
Figure 2. TLD5098 application circuit diagram: B2G configuration Figure 2 Application circuit material list:
Figure 3. TLD5098 SEPIC Application Circuit Diagram: Buck-Boost Configuration Figure 3 TLD5098 SEPIC Application Circuit Material List:
Figure 4. TLD5098 Flyback Application Circuit Diagram: Buck-Boost Configuration Figure 4 TLD5098 Flyback Application Circuit Material List:
Figure 5. TLD5098 boost-battery application circuit diagram: B2B (buck-boost configuration)
Figure 5 TLD5098 boost-battery application circuit diagram material list:
Figure 6. TLD5098 Buck Application Circuit Diagram Figure 6 TLD5098 Buck Application Circuit Diagram Material List:
Figure 7. TLD5098 boost application circuit diagram. Figure 7 TLD5098 boost application circuit diagram material list:
LITIXTM Power TLD5098EL Application Board
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.
Figure 8. Outline of the LITIXTM Power TLD5098EL Application Board: B2G Configuration
Figure 9. LITIXTM Power TLD5098EL Application Board Circuit Diagram: B2G Configuration
LITIXTM Power TLD5098EL Application Board Bill of Materials: B2G Configuration
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