STEVAL-ILL023V1 STMicroelectronics, STEVAL-ILL023V1 Datasheet
STEVAL-ILL023V1
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STEVAL-ILL023V1 Summary of contents
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... This document presents the demonstration board designed for 2.8 A LEDs (1 series string) focusing on easy dimming and high efficiency. Figure 1. STEVAL-ILL023V1 - 2.8 A LED driver (LED is not included in the kit) May 2010 High-efficiency switching LED driver for high-current LEDs ...
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Contents Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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UM0677 List of tables Table 1. Board parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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... List of figures List of figures Figure 1. STEVAL-ILL023V1 - 2.8 A LED driver (LED is not included in the kit Figure 2. 2.8 A LED driver based on the L6726A + external MOSFET . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 3. Part of schematics with highlighted components for efficient current sensing . . . . . . . . . . . 7 Figure 4. PCB layout - top side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 5. PCB layout - bottom side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 6 ...
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UM0677 2 Description of reference design This solution uses the L6726A controller with two external MOSFETs for synchronous rectification. The main advantage is very good efficiency. Future scalability for even higher currents could be seen as another advantage. This solution ...
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Description of reference design Figure 2. 2.8 A LED driver based on the L6726A + external MOSFET 6/16 Doc ID 15396 Rev 2 UM0677 ...
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UM0677 2.1 Current sensing Adapting the voltage step-down regulator as a constant current source requires few external components (as indicated in but that results in high losses on the sense resistors (feedback reference is 0.8 V). When voltage reference TS821 ...
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Description of reference design 2.2 Dimming interface For more advanced applications, the reference design also includes an interface for dimming. The board itself does not include any signal generator, but to keep universality with different control schemes (analog or digital ...
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UM0677 3 Application The PCB layout (top and bottom side) of the application displayed in the schematic of Figure 2 is shown in the two figures below. The two layers of the PCB (35 µm thickness of Cu) are used, ...
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Application Figure 6. Reference design detail Figure 7. Thermal snapshot at full load 10/16 Doc ID 15396 Rev 2 UM0677 ...
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UM0677 3.1 Measurement results Several tests made on the reference design can be observed in Figure 8. Output current with 1 LED (Seoul Semiconductor P7) Figure 9. Dimming control curve (12 V input, 1 LED output) Doc ID 15396 Rev ...
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Application Figure 10. Variation in output currents with load change (number of LEDs in a string) Figure 11. Variation in output current vs. input voltage (1 LED load) 12/16 Doc ID 15396 Rev 2 UM0677 ...
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UM0677 4 Bill of material Table 3. Bill of material Designator Comment C1 Cap. pol. C2 Cap. C3 Cap. C4 Cap. pol. C5 Cap. C6 Cap. C7 Cap. C8 Cap. C9 Cap. pol. CN1 Connector D1 V REF D2 Diode ...
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References and related materials 5 References and related materials 1. AN2129 - DIMMING OF SUPER HIGH BRIGHTNESS LEDS WITH L6902D - see www.st.com/stonline/products/literature/an/11247.pdf 2. AN1891 - APPLICATION IDEAS: DRIVING LEDS USING L497X, L597X,L692X DC- DC CONVERTERS FAMILIES - see www.st.com/stonline/products/literature/an/ ...
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UM0677 6 Revision history Table 4. Document revision history Date 07-May-2009 14-May-2010 Revision 1 Initial release. STS8DNH3LL device replaced by STS8DN3LLH5 device - updated 2 Figure 2, Table 3, Section Figure 9 and Table 3. Doc ID 15396 Rev 2 ...
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... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...