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Texas Instruments LM5122 | Demoboard TIDA-00748
60W Synchronous Boost LED Driver Reference Design for Automotive Application
Overview
| Topology | Boost Converter |
| Input voltage | 8-20 V |
| Output 1 | 24 V / 3 A |
| IC revision | 1 |
Description
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.
Features
60W Synchronous Boost LED DriverWide Vin for automotive lightingInput: 8V to 15V, Output: 16V to 24V (Boost only) or 9V to 12V (Boost-to-Battery)97% peak efficiencySwitching frequency: 140KHz kHzOvervoltage protection, UVLOAEC-Q100 grade available for LM5122-Q14 Layer Board-Dimensions: 2100mil*5200milFree-run or synchronous switching up to 1MHzBoost or Boost-to-Battery configurations allow operation for Vin>VLED , Vin=VLED, Vin<VLEDCycle-by-Cycle Current Limit and optional Hiccup Mode Overload protection
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 10 V(DC), 4.7 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 10 V(DC) | Capacitance4.7 µF | Capacitance±10% | Rated Voltage10 V (DC) | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor10 % | Insulation Resistance0.02 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
 | WE-HCI SMT Flat Wire High Current Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | – | – | – | Size2212 | Operating Temperature -40 °C up to +125 °C | – | – | – | Length22.5 mm | Width22 mm | Height12 mm | – | – | Inductance10 µH | Performance Rated Current22.9 A | Saturation Current @ 10%8 A | Saturation Current @ 30%26 A | DC Resistance3.4 mΩ | Self Resonant Frequency15 MHz | MaterialMnZn |