NCV7680 ON Semiconductor, NCV7680 Datasheet
NCV7680
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NCV7680 Summary of contents
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... 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. ...
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Ballast Drive Regulation Control Ballast Drive FET Drive 1.05 V Output Control STOP Diagnostic Reporting (high reporting) DIAG Open Circuit Rstop Current Limit Overvoltage Set Back Current (down 20%) Figure 1. Simple Block Diagram http://onsemi.com 2 VP ...
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VP Ballast Drive FB − FET Drive 100k + 1.05 V − STOP 200k 5V DIAG Overvoltage Soft Start, Bias, and Reference Channel Control Overtemperature & Overvoltage sense Control Logic DIAG Interface I x 100 RSTOP Oscillator V−I ...
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... Figure 4. Application Diagram with External FET Ballast Transistor MRA4003T3G TAIL Input MRA4003T3G STOP Input R1 10k C4 10nF Figure 5. Application Diagram without the FET Ballast Transistor When using the NCV7680 without the FET ballast transistor, tie the FB Pin to VP through a 10k resistor. NTD2955 C3 R3 100nF 1k C2 0.22mF NCV7680 OUT2 ...
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Table 1. APPLICATION I/O TRUTH TABLE Stop Input Tail Input Open Circuit, R Current Limit, and Set Back Current Limit down 20% STOP ** Pullup resistor to ...
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... Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. For additional information, see or download ON Semiconductor’s Soldering and Mounting Techniques Reference Manual, SOLDERRM/D, and Application Note AND8003/D. (16 Pin SO Wide Exposed Pad Package) Description Channel 1 constant current output to LED ...
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... YJL Meets or exceeds JEDEC Spec EIA/JESD78 IC Latchup Test 2. For additional information, see or download ON Semiconductor’s Soldering and Mounting Tech- niques Reference Manual, SOLDERRM/D, and Application Note AND8003/D. 3. Values represent typical still air steady−state thermal performance on 1 oz. copper FR4 PCB with ...
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ELECTRICAL CHARACTERISTICS (6 V < V otherwise specified) (Note 4) Characteristic STOP LOGIC Input High Threshold Input Low Threshold V Hysteresis IN Input Bias Current STOP = 14 V PROGRAMMING R Bias Voltage Stop Current Programming Voltage STOP R K ...
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TYPICAL PERFORMANCE CHARACTERISTICS 160 140 120 100 1000 D = 0.5 100 0.2 0.1 10 0.05 0.02 0.01 1 SINGLE PULSE 0.1 0.000001 0.00001 0.0001 Figure 8. Thermal Duty Cycle Curves on 650 mm ...
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R (kW) STOP Figure 10. I vs. R OUT STOP ...
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VP Figure 16. VP Line Regulation 120 100 OUTX ...
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... Set back power limit is most useful for low current applications when no external FET is used. The NCV7680 offers all of the built in protection normal to regulator systems, such as current limit, thermal limit, and provides an open load diagnostic that coincides with the STOP input signal ...
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... Figure 21. Alternative V Programmability Strings of LEDs are a common configuration for RCL applications. The NCV7680 provides eight matched outputs allowing individual string drive with current set by a single resistor. Individual string drive is a benefit to ensure equal current distribution amongst all of the strings. Output currents are mirrored and matched within ± ...
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... Reduced Channel Operation The previously shown applications (Figures 4 and 5) show system operation using all 8 available channels of the NCV7680. When less than 8 channels are used, the unused OUTx pins can be grounded eliminating the unused OUTx drive current. This is accomplished by voltage threshold detection on OUTx (100 mV typ). A voltage less than ...
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... MRA4003T3G TAIL Input MRA4003T3G STOP Input R1 10k C4 10nF C3 + 1mF − NCV3163 Boost Controller OUT1 VP Ballast Drive R8, 10k FB STOP/PWM DIAG R4, 3.09k RSTOP RTAIL R5, 2.21k Figure 23. Boost Mode http://onsemi.com 15 www.DataSheet4U.com + − NCV7680 OUT2 OUT3 OUT4 GND OUT5 OUT6 OUT7 OUT8 epad ...
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... Cross-Coupled LEDs The setup in Figure 24 shows the LEDs set cross-coupled configuration connected to all the outputs of the NCV7680 in parallel. This allows the user to maintain illumination of all the remaining LEDs when one fails due to an open circuit (the most common form of LED failure). ...
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... Ballast Drive FB STOP/PWM DIAG R4, 3.09k RSTOP RTAIL epad R5, 2.21k Figure 25. No Tail Light, Stop Illuminated NTD2955 C3 R3 100nF 0.1mF 0.22mF NCV7680 OUT1 VP Ballast Drive FB STOP/PWM DIAG R4, 3.09k RSTOP RTAIL epad R5, 2.21k Figure 26. Tail Light Illuminated, No Stop http://onsemi.com 17 www.DataSheet4U.com V STRING OUT2 ...
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... R1 10k C4* 10nF * Optional for EMI considerations Figure 27. PWM Operation (suggested LCD backlighting applications) External PWM Operation Using the NCV7680 in a PWM setup requires R grounded. Grounding R disables the internal PWM TAIL circuitry. With R grounded, the STOP input pin can then TAIL be modulated externally with a microprocessor using the STOP logic input level thresholds ...
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... DIAG pin coupled with external discrete transistors provides the feedback needed to the FB pin to turn off the ballast transistor drive removing the LED anode string from any power source. This condition is held until the input signal is toggled 100nF 0.22uF NCV7680 OUT2 OUT1 OUT3 VP OUT4 Ballast Drive FB GND ...
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... J 0.25 0.32 0.010 0.012 K 0.00 0.10 0.000 0.004 L 4.72 4.93 0.186 0.194 10.05 10.55 0.395 0.415 R 0.25 0.75 0.010 0.029 Exposed Pad 0.188 0.376 C L 0.150 DIMENSIONS: INCHES ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCV7680/D ...