The TLD5045 is a highly integrated smart LED buck controller with built in protection functions. The main function of this device is to drive single or multiple series connected LEDs efficiently from a voltage source higher than the LED forward voltage by regulating a constant LED current. The constant current regulation is especially beneficial for LED color accuracy and long LED lifetime. The built in freewheeling diode and switching transistor with current sense requires less external components and saves system costs. High flexibility is achieved by placing low power resistors to adjust output currents up to 700mA and the regulator switching frequency (typ. 200kHz). An integrated PWM dimming engine provides a LED dimming function by placing a simple RC network to GND. This feature is dedicated for decentralized light modules without microcontroller involvement. In addition to that an integrated status pull down transistor can be used to simulate a minimum current flow for decentralized modules to avoid a wrong open load detection by a highside switch located in the body control module (BCM).
Summary of Features:
Highly integrated BUCK DC/DC converter
Constant Current Generation
Wide Input Voltage Range from 5V to 40V
Peak Current Regulation
Very low current consumption (<2uA) in Sleep Mode
Integrated power transistor with low saturation voltage
Integrated fast freewheeling diode
Integrated load current sense resistor
Integrated status pull down transistor
Overtemperature Protection
Switching frequency (typ. 200kHz) ad justable via external RC network
External PWM Dimming Input
Integrated PWM Dimming Engine
Analog Dimming (output current adjustable via external low power resistor and possibility to connect PTC resistor for LED protection during overtemperature conditions)
Stable switching frequency due to fix OFF-time concept with VREC (supply voltage) feedforward
Under- and Overvoltage shutdown with hysteresis
Small thermally enhanced exposed heatslug SMD package
