60W Synchronous Boost LED Driver Reference Design for Automotive Application (TIDA-00748)
TIDA-00748 is a 60W Synchronous Boost Design for automotive LED application utilizing the Synchronous Boost Converter LM5122-Q1. This design applies to automotive lighting for exterior lighting such as headlights and taillights and also interior LED lighting systems. The design accepts an input voltage of 8Vin to 15Vin and can drive multiple strings of 6 to 7 LEDS (16V to 24V) in series at 3A constant current. It is a low cost solution and provides undervoltage as well as overvoltage protection. This solutions offers 97% efficiency compared to inefficient nonsynchronous Boost solutions. The TIDA-00748 can also be modified to a Boost-to-Battery configuration by connecting the cathode of the LED string (9V to 12V) to the input rather than ground and connecting the output capacitors from input to output. In this configuration, the 8V to 15V input can power strings of LEDs that require voltages lower than, higher than, or equal to the input voltage which would not work with the standard Boost configuration which requires the output voltage to be higher than the input voltage. See Figure 1 for the Boost-to-Battery configuration along with the internal block diagram of the LM5122.
60W Synchronous Boost LED Driver Wide Vin for automotive lighting Input: 8V to 15V, Output: 16V to 24V (Boost only) or 9V to 12V (Boost-to-Battery) 97% peak efficiency Switching frequency: 140KHz kHz Overvoltage protection, UVLO AEC-Q100 grade available for LM5122-Q1 4 Layer Board-Dimensions: 2100mil*5200mil Free-run or synchronous switching up to 1MHz Boost or Boost-to-Battery configurations allow operation for Vin>VLED , Vin=VLED, Vin<VLED Cycle-by-Cycle Current Limit and optional Hiccup Mode Overload protection
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