FL7760LED1GEVK

FL7760LED1GEVK 3W SPI Controllable LED Driver Evaluation Board User's Manual www.onsemi.com EVAL BOARD USER’S MANUAL OVERVIEW This manual covers the specification, theory of operation, testing and construction of the FL7760LED1GEVK demonstration kit. The FL7760 kit demonstrates a 1 A buck LED driver intended for a single high−power LED. The SPI (Serial Peripheral Interface) bus does both analog and PWM dimming. The kit includes a load/SPI interface board to facilitate operation of the driver. The driver can be driven independently from any SPI controller. The nominal input voltage is 12 V. Table 1. SPECIFICATIONS Input Voltage Output Voltage 10.8 V dc − 13.2 V dc 2.5 V dc − 5.0 V dc Output Current 1A Max Output Ripple 40 mA P−P 85% Typ. Efficiency Switching Frequency 200 kHz Rise/Fall Time < 20 ms Dimming Interface SPI Dimming Resolution PCB Size FL7760LED1GEVK Evaluation Board 8 bits 30 mm × 30 mm The key features of this demo kit include: • Low Parts Count • Single Sided Assembly • Small Footprint • Very Fast Rise/Fall Times • SPI Dimming Control for Analog and PWM Dimming • 12 V Operation • Integrated Thermal Shutdown and UVLO THEORY OF OPERATION Power Stage The power stage is a CCM inverted buck converter. The output inductor sets the switching frequency because the control operates in hysteretic control mode. The peak and valley current are fixed percentages of the current reference. This fixes the inductor ripple current and eliminates the need for closed loop compensation. A novel high side current sense enables direct accurate control of the output current. © Semiconductor Components Industries, LLC, 2012 January, 2019 − Rev. 0 1 Publication Order Number: EVBUM2607/D FL7760LED1GEVK HV Start OVP The output voltage is inherently limited to be less than or equal to Vin. As such, no OVP is required due this inherent limitation. The FL7760 supplies its own Vcc power greatly simplifying implementation. The input voltage range is 8 V − 70V. The internal Vcc regulates to 5 V ± 10%. The internal Vcc supplies a 3.3 V LDO for powering the DAC. The regulator and DAC draw less than 1mA combined. Load Board Operation The load board connects to the LED driver via an 8 conductor FPC cable. The FPC cable makes a simple and convenient interconnection. The load board serves 2 major functions: 1) provide an easy connection to an LED load 2) provide a USB−SPI bridge for computer control of the LED driver. Dimming The FL7760 dim input controls both amplitude and on/off control. This makes the dim interface controllable by analog, PWM, or both at the same time. The DAC has an output range of 0 V – 3.3 V for 8 bits of resolution. A dim signal below 0.5 V turns off the output and a dim signal above 3 V is 100% output. The daughter card on the load has a mini USB−A connection for attachment to your computer. See the test procedure for details of the setup of the SPI terminal application. Protection Thermal Protection The thermal protection is built into the FL7760 and shuts down the FL7760 when the die temperature exceeds 150°C. SCHEMATIC L1 CONN JACK PWR R1 4.7uH 1 2 3 J1 200m +12V C1 J3 CS C2 4.7uF 25V SCLK 4.7uF 25V MOSI D1 FSV330AF C3 4.7uF 25V L2 U1 1 U2 SPI DAC 6 CS SCLK 5 MOSI 4 nSync Vout Sclk Gnd Din Vdd 1 2 3 2 3 Vin Sens Gnd Vcc DIM GDrv 47uH 6 Vcc 5 Q1 4 FL7760 MGSF1N03LT1G C4 4.7uF 25V +3.3V DAC081S101CIMK/NOPB R2 10k R3 10k R4 10k U3 5 +3.3V C5 Vout Vin Gnd 1uF EN 2 3 TLV71333PDBVR Figure 1. LED Driver Circuit www.onsemi.com 2 Vcc 1 R5 10k 1 2 3 4 5 6 7 8 FH12−8S−0.5SH(55) Mtg1 8 7 6 5 4 3 2 1 Mtg2 Mtg3 1 1 1 J5 1 LED−1 1 LED+1 1 FL7760LED1GEVK Mtg4 U1 CS FH12−8S−0.5SH(55) SCLK MOSI SCLK MOSI 14 13 12 11 10 9 8 Vdd C1 10uF MCP2210 1 1 1 1 1 1 2 3 4 5 6 7 CS CS1 SCLK1 J4 J3 Gnd1 Gnd2 1 2 3 4 5 6 7 MOSI1 J2 8 7 6 5 4 3 2 1 CONN PCB 7 1 2 3 4 5 6 7 CONN PCB 7 Headers for U1 0982660083 FPC Cable for J5 Figure 2. LED Driver Circuit Table 2. BILL OF MATERIAL Qty Reference Part Distributor Dist. P/N Manufacturer Mfr_PN 4 C1, C2, C3, C4 4.7 uF 25 V Digikey 1276−3178−1−ND Samsung CL31B475KAHNNWE 1 C5 1 uF Digikey 587−3247−1−ND Taiyo Yuden UMK107AB7105KA−T 1 D1 FSV330AF ON Semiconductor FSV330AFCT−ND ON Semiconductor FSV330AF 1 J1 CONN JACK PWR Digikey 732−5929−1−ND Wurth 694106106102 1 J3 FH12−8S−0.5SH(55) Digikey H124618CT−ND Hirose FH12−8S−0.5SH(55) 1 L1 4.7 uH Digikey 445−6760−1−ND TDK MLZ2012N4R7LT000 1 L2 4.7 uH Digikey 732−2197−1−ND Wurth 7447715470 1 Q1 MGSF1N03LT1G ON Semiconductor MGSF1N03LT1GOSCT−ND ON Semiconductor MGSF1N03LT1G 1 R1 200 m Digikey CSR1206FKR200CT−ND Stackpole CSR1206FKR200 4 R2, R3, R4, R5 10 k Digikey 311−10.0KLRCT−ND Yageo RC0402FR−0710KL 1 U1 FL7760 ON Semiconductor FL7760 ON Semiconductor FL7760 1 U2 DAC081S101CIMK/NOPB Digikey DAC081S101CIMK/NOPBCT−ND TI DAC081S101CIMK/NOPB 1 U3 TLV71333PDBVR Digikey 296−35591−1−ND TI TLV71333PDBVR 5 SCLK1, MOSI1, Gnd1, CS1, Gnd2 Test Point Digikey 952−2264−1−ND Harwin S2751−46R 1 C1 10 uF Digikey 1276−6641−1−ND Samsung CL31B106MOHNNNE 1 J2 982660083 Digikey WM14102−ND Molex 982660083 2 J3, J4 CONN PCB 7 Digikey S7040−ND Sullins PPPC071LFBN−RC 1 J5 FH12−8S−0.5SH(55) Digikey H124618CT−ND Hirose FH12−8S−0.5SH(55) 2 LED−1, LED+1 MTG_Hole Digikey 3267 Pomona 3267 1 U1 MCP2210 Digikey ADM00419−ND Microchip ADM00419 www.onsemi.com 3 FL7760LED1GEVK TEST PROCEDURE Equipment Needed DC Source − 12 V ± 5% @ 1 A 2 − DC Voltmeter − 300 V dc minimum 0.1% accuracy or better 2 − DC Ammeter − 1 A dc minimum 0.1% accuracy or better LED Load − 2.5 V − 5.0 V @ 1.0 A Figure 3. Test Set Up The Connections Functional Test Procedure 1. Connect the LED load board to the LED driver using the FPC cable provided in the kit. 2. Connect red (+) and black (−) leads through the ammeter to the LED load. 3. Connect a 12 V dc source to the input power connector. NOTE: Unless otherwise specified, all voltage measurements are taken at the terminals of the UUT. 1. Set the LED Load for 3.5 V output. 2. Set the input voltage to 12 V. 3. Measure input voltage and current. 4. Measure output voltage and current. Regulation See Table 3. Table 3. REGULATION DAC Data Iout Target 00 00 0A 0F F0 1 A ± 5% 07 00 0.5 A ± 5% Efficiency + Vout Vin Iout Iin Output Current Output Voltage 100% www.onsemi.com 4 Input Voltage Input Current FL7760LED1GEVK TEST DATA 100% 95% Efficiency 90% 85% 80% 75% 70% 0% 20% 40% 60% 80% 100% 120% Percent of Max Load Figure 4. Efficiency 100% 90% 80% y = 0.0041x + 0.0392 Percent of Max Current 70% 60% 50% 40% 30% 20% 10% 0% 0% 50% 100% 150% 8 Bit Number Figure 5. Dim Curve www.onsemi.com 5 200% 250% 300% FL7760LED1GEVK Figure 6. Input Current Ripple Figure 7. Output Current Ripple www.onsemi.com 6 FL7760LED1GEVK Figure 8. Input Current Rise Figure 9. Output Current Fall www.onsemi.com 7 FL7760LED1GEVK THERMAL IMAGE Figure 10. www.onsemi.com 8 ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. 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