PDF NCV7680 Data sheet ( Hoja de datos )

Número de pieza	NCV7680
Descripción	Linear Current Regulator and Controller
Fabricantes	ON Semiconductor
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No Preview Available ! NCV7680 Linear Current Regulator and Controller for Automotive LED Rear Combination Lamps The NCV7680 consists of eight linear programmable constant current sources. The part is designed for use in the regulation and control of LED based Rear Combination Lamps for automotive applications. System design with the NCV7680 allows for two brightness levels, one for stop and one for tail illumination, or optional PWM control can also be implemented. Discrete LED brightness levels are easily programmed (stop current value, tail duty cycle value) optional external ballast FET allows for power distribution on designs requiring high currents. Set back power limit reduces the drive current during overvoltage conditions. This is most useful for low current applications when no external FET is used. Features • Constant Current Outputs for LED String Drive • LED Drive Current up to 75 mA per Channel • Open LED String Diagnostic with Open−Drain Output • Slew Rate Control Eliminates EMI Concerns • Low Dropout Operation for Pre−Regulator Applications • External Modulation Capable • On−chip 1 kHz Tail PWM Dimming • Single Resistor for Stop Current Set Point • Single Resistor for Tail Dimming Set Point • Overvoltage Set Back Power Limitation • AEC Q100 Qualified • 16 Lead SOICW Exposed Pad • This is a Pb−Free Device Applications • Rear Combination Lamps (RCL) • Daytime Running Lights (DRL) • Fog Lights • Center High Mounted Stop Lamps (CHMSL) Arrays • Turn Signal and Other Externally Modulated Applications • LCD Back Lighting http://onsemi.com MARKING DIAGRAM SOIC−16 WB PW SUFFIX CASE 751AG V7680 AWLYYWWG A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Device ORDERING INFORMATION Device Package Shipping† NCV7680PWR2G SOIC−16WB 1000 / (Pb−Free) Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. © Semiconductor Components Industries, LLC, 2013 March, 2013 − Rev. 6 1 Publication Order Number: NCV7680/D 1 page NCV7680 Table 1. APPLICATION I/O TRUTH TABLE (FB = Vref) (Reference Figure 2) Stop Input Tail Input OUTX Current (1−8) 0 0 OFF 1 0 ISTOP 1 0 ISTOP 0 1 PWM 1 1 ISTOP 1 1 ISTOP * Open Circuit, RSTOP Current Limit, and Set Back Current Limit down 20% Pullup resistor to DIAG * OPEN CIRCUIT = Any string open 0 = LOW 1 = HIGH Fault State* − NORMAL OPEN CIRCUIT* DO NOT CARE NORMAL OPEN CIRCUIT* DIAG State HIGHZ LOW HIGH HIGH LOW HIGH TAIL STOP HIGHZ DIAG Open String Occurs Open String Removed Figure 6. DIAG Timing Diagram Open String Occurs http://onsemi.com 5 5 Page NCV7680 36 35.8 35.6 35.4 35.2 35 34.8 34.6 34.4 34.2 OUTX = 1 V 34 6 7 8 9 10 11 12 13 14 15 16 VP Figure 16. VP Line Regulation 14 12 10 8 6 4 2 0 0 per eq. 1 R7 = 1K 2000 4000 6000 8000 10000 12000 R6 (W) Figure 17. VSTRING vs. R6 120 100 80 60 40 20 0 0 OUTx current is limited during short circuit events of RSTOP. The current rolls off per the diagram to prevent unexpected excessive power dissipation. 0.5 1.0 1.5 IRSTOP (mA) Figure 18. IOUT vs. IRSTOP 2.0 2.5 http://onsemi.com 11 11 Page

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Número de pieza	Descripción	Fabricantes
NCV7680	Linear Current Regulator and Controller	ON Semiconductor

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