High Efficiency Buck Dual LED Driver with Integrated Current Sensing for Automotive Front Lighting NCV78723 www.onsemi.com The NCV78723 is a single-chip and high efficient Buck Dual LED Driver designed for automotive front lighting applications like high beam, low beam, DRL (daytime running light), turn indicator, fog light, static cornering, etc. The NCV78723 is in particular designed for high current LEDs and provides a complete solution to drive 2 LED 24 1 24 1 strings of up-to 60 V. It includes 2 independent current regulators for QFN24 QFNW24 the LED strings and required diagnostic features for automotive front CASE 485CS CASE 484AF lighting with a minimum of external components the chip doesnt need any external sense resistor for the buck current regulation. Theavailable output current and voltages can be customized per MARKING DIAGRAM individual LED string. When more than 2 LED channels are required on 1 module, then 2, 3 or more devices NCV78723 can be combined 1 also with NCV78713 device the derivative of the NCV78723 ON incorporating Buck Single LED Driver. Thanks to the SPI N787230 programmability, one single hardware configuration can support AWLYYWW various application platforms. Features Single Chip 1 ON Buck Topology N787232 2 LED Strings up-to 60 V FAWLYYWW High Current Capability up to 1.6 A DC per Output High Overall Efficiency Minimum of External Components N787230 = Specific Device Code N787232 = Specific Device Code Integrated High Accuracy Current Sensing F = Fab Indicator Integrated Switched Mode Buck Current Regulator A = Assembly Location Average Current Regulation through the LEDs WL = Wafer Lot YY = Year High Operating Frequencies to Reduce Inductor Sizes WW = Work Week Low EMC Emission for LED Switching and Dimming = PbFree Package SPI Interface for Dynamic Control of System Parameters (Note: Microdot may be in either location) Fail Safe Operating (FSO) Mode, Stand-Alone Mode These Devices are PbFree, Halogen Free/BFR Free and are RoHS ORDERING INFORMATION See detailed ordering and shipping information on page 31 of Compliant this data sheet. Typical Applications High Beam Low Beam DRL Position or Park Light Turn Indicator Fog Static Cornering Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: January, 2020 Rev. 4 NCV78723/DNCV78723 TYPICAL APPLICATION SCHEMATIC VBOOST C M3V VBOOSTM3V VBOOST LED-String 1 VINBCK1 C BCK 1 LBCKSW1 L BCK 1 LBCKSW1 D 1 R LED 1 VLED1 External ON Semiconductor C LED 1 VDD Supply LED Driver 2-Channel Buck LED-String 2 NCV78723 VDD V of MCU CC VINBCK2 C DD C BCK 2 LBCKSW2 R SDO L BCK 2 LBCKSW2 D 2 R LED 2 RSTB VLED2 LEDCTRL1 C LED 2 C LEDCTRL2 SCLK SDI SDO CSB Figure 1. Typical Application Schematic Table 1. EXTERNAL COMPONENTS Component Function Typical Value Unit L BCK x Buck Regulator Coil (see Buck Regulator Chapter for Details) 47 H C BCK x Buck Regulator Output Capacitor (see Buck Regulator Chapter for Details) 220 nF C M3V Capacitor for M3V Regulator (see Table 6 VBOOSTM3V) nF C DD V Decoupling Capacitor 470 nF DD C LED x Optional VLEDx Pin Filter Capacitor (Note 2) 1 nF R LED x VLEDx Pin Serial Resistor (Notes 2 and 3) Min. 1 k R SDO SPI Pull-Up Resistor 1 k D x Buck Regulator Free-Wheeling Diode e.g. MBRS2H100T3G 1. Pin TEST has to be connected to ground. TEST1 and TEST2 pins can be connected to ground or left floating. 2. C LED x is optional. If used, time constant of the C LED x and R LED x filter has to be lower than minimal LEDCTRLx ON time in PWM dimming for proper VLED measurement. 3. R LED x is necessary to ensure Absolute Maximum Ratings of IVLEDx current (see Table 3). www.onsemi.com 2 TEST TEST1 TEST2 GND EXPOSED PAD