NCV7680-NCV3136EVB NCV7680-NCV3163 Evaluation Board User's Manual http://onsemi.com Description The NCV7680 is an octal LED driver designed for automotive LED rear combination lamps. External programmability of the NCV7680 allows the user to set the tail current and stop currents using a single resistor for each function. An optional external FET is used to help distribute power for high power systems. The NCV7680−NCV3163 Evaluation Board includes both an NCV7680 (octal driver) and NCV3163 (Boost Regulator). The NCV3163 allows for an increased number of LEDs per NCV7680 output by boosting the LED string anode voltage. The DIAG pin is brought out for reporting of open circuit conditions. The LED’s mounted on the evaluation board are jumpered giving flexibility for evaluating customer defined loads. EVAL BOARD USER’S MANUAL • External PWM Input • Adjustable Boost Circuit with Internal Switch − Set for • 28 V on the NCV7680−NCV3163EVB Evaluation Board These Devices are Pb-Free and are RoHS Compliant NOTE: For 100% Duty Cycle operation, connect the PWM Input post to the VP post. The default setup (with the 2 posts floating) yields 0% Duty Cycle. Part Features • • • • • • • • • • • Constant Current Outputs for LED String Drive Open LED String Diagnostic with Open-Drain Output 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 SOW Exposed Pad These are Pb-Free Devices Board Features • STOP Input Switch − Controls power to the circuit • DIAG Output − Open Circuits are Reported • LED Isolation − On-board LEDs can be Removed with • Jumpers for Alternative LED Evaluation STOP Programming Current − Programming Resistor can be Adjusted Externally by Jumper Removal © Semiconductor Components Industries, LLC, 2014 June, 2014 − Rev. 1 Figure 1. NCV7680−NCV3163EVB Photo 1 Publication Order Number: EVBUM2245/D Jumper 1: Allows external source to be connected instead of NCV3163 boost circuit. Jumper 2: 7680 VP pin connection, allows bias current measurement. Jumper 3: Allows easy connection to switch RSTOP. Jumper 4−11: Enables the user to add external LED loads. Jumper 13: Switch DIAG pull-up resistor. NCV7680−NCV3136EVB Figure 2. NCV7680−NCV3163EVB Schematic http://onsemi.com 2 NCV7680−NCV3136EVB Powering Up the Board 2. Typical connections to the evaluation board are shown in Figure 4. Set the PWM input to a 200 Hz 5 V square wave when using external PWM. To disable PWM and run at 100% duty cycle, connect PWM Input to VP. 3. Connect the power supply, 13.2 V typical for a car battery. 4. Position switch 1 (SW1) left to turn the circuit off, and right to turn the circuit on. Equipment Needed: • 1 Power Supply (2 A) • 1 Function Generator (200 Hz) 1. There are 12 jumpers on the board. Start with all 12 jumpers connected. Jumper locations are shown in Figure 3. A list of jumper functionality is shown in the board schematic (Figure 2). PWM INPUT Left − Off Right − ON VBATT 13.2 V NOTE: Unloaded OUTx pins should be grounded for proper operation. + _ NOTE: For 100% Duty Cycle operation, connect the PWM Input post to the VP post. The default setup (with the 2 posts floating) yields 0% Duty Cycle. Figure 3. Jumper Locations Figure 4. Power Connections http://onsemi.com 3 NCV7680−NCV3136EVB Jumpers 4−11: DIAG Reporting of Open Circuit NOTE: If external PWM is being used, the DIAG will always report an “open” (high value) while the PWM Input is low (i.e. the LEDs are off). Therefore, to check if an open is occurring on any output LED strand, only check DIAG when PWM Input is high. Jumpers 4−11 highlight the open circuit functionality of diagnostic pin (DIAG). Monitor DIAG while creating an open circuit by removing any on these jumpers (4−11). DIAG will go high when an open is detected. PWM INPUT Left − Off Right − ON VBATT 13.2 V + _ V Figure 5. Open Circuit Detection http://onsemi.com 4 NCV7680−NCV3136EVB Jumper 13, DIAG Load Disconnect Jumper 13. Connect the external resistor to a separate supply. The DIAG pin is limited to 45 V per the maximum ratings table. Figure 6 shows the test setup for using DIAG with a separate supply. Jumper 13 disconnects the PC board pullup resistor and allows the user to interface their own component and power supply to the DIAG pin. Table 1. MAXIMUM RATINGS (Voltages are with respect to device substrate) Rating Value Unit VP, Ballast Drive, STOP, DIAG DC Peak Transient −0.3 to 45 45 V Output Pin Voltage (OUTX) −0.3 to 45 V Output Pin Current (OUTX) 100 mA −0.3 to 5 V Junction Temperature, TJ −40 to 150 °C Peak Reflow Soldering Temperature: Pb-Free 60 to 150 seconds at 217°C (Note 1) 260 Peak °C Input Voltage (RTAIL, RSTOP, FB) Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. For additional information, see or download ON Semiconductor’s Soldering and Mounting Techniques Reference Manual, SOLDERRM/D, and Application Note AND8003/D. Table 2. DIAG OUTPUT Characteristic Conditions Min Typ Max Unit Output Low Voltage DIAG Active, IDIAG = 1 mA − 0.1 0.4 V Output Leakage Current VDIAG = 5 V − − 10 mA PWM INPUT Left − Off Right − ON VBATT 13.2 V + _ + _ Figure 6. DIAG Connection http://onsemi.com 5 NCV7680−NCV3136EVB Jumper 3, Program Current Jumper 3 allows the user to program the LED output current. The value of RSTOP (R10) initially on the board is 4.3 kW, 25 mA through each output. Remove the jumper to disconnect the PC board resistor and connect a different value. Resistor values and resultant output programmed currents can be calculated using these design equations: OUTX + 100 R STOP R STOP_BIAS_Voltage + 1.08 V (typ) PWM INPUT Left − Off Right − ON VBATT 13.2 V R STOP_BIAS_Voltage + _ Figure 7. RSTOP Programming Resistor http://onsemi.com 6 (eq. 1) NCV7680−NCV3136EVB Jumper 1, Boost Voltage Jumper 1 disconnects the boost voltage from the LED anode. This allows the user to connect an external source in place of the boost as seen in Figure 8. PWM INPUT Left − Off Right − ON + _ VBATT 13.2 V + _ Figure 8. External Boost or Other Source Connection http://onsemi.com 7 NCV7680−NCV3136EVB External LED Connection Figure 10 shows how to connect additional LEDs in series with the on-board LEDs to increase the number of LEDs per strand. Note that you will need to increase the boost voltage or use an external source to drive the same current. Jumpers 4 through 11 allow the user to connect additional LEDs or an entirely different set of LEDs in place of the LEDs on the board. Figure 9 shows an external set of LEDs connected to the board while the on-board LEDs are disconnected (J4−11 removed). Left − Off Right − ON VBATT 13.2 V + _ Figure 9. External LEDs PWM INPUT Left − Off Right − ON VBATT 13.2 V + _ Figure 10. Additional LEDs (Only One Strand Shown) http://onsemi.com 8 NCV7680−NCV3136EVB Boost Voltage The internal switch of the NCV3163 is rated at 3.4 A max, raising the regulation voltage or current too high may cause the boost circuit to operate undesirably or require different components. Resistors R3 and R1 set the boost regulation voltage. This resistor network may be changed to regulate to a different voltage. Please follow the NCV3163 design spreadsheet (located at www.onsemi.com). PWM INPUT Left − Off Right − ON VBATT 13.2 V + _ Figure 11. Boost Feedback Resistor Network Jumper 2, VP Connection Jumpers 2 allows for measurement of the 7680 bias current. http://onsemi.com 9 NCV7680−NCV3136EVB Table 3. BILL OF MATERIALS (NCV7680−NCV3163 Evaluation Board) Substitution Allowed Designator Qty Description Value Tolerance Footprint Manufacturer Manufacturer Part Number C1 1 Timing Capacitor 100 pF 10% 1206 Yageo CC1206JRNP09BN101B Yes C2, C5 2 Input Capacitor 0.1 mF 10% 1206 Yageo CC1206KRX7R9BB104 Yes C3, C4 2 Electrolytic Capacitor 330 mF/50 V 20% 12.5 × 13.5 mm Panasonic EEV-TG1H331Q Yes C6 1 Output Capacitor 1 mF 10% 1210 Kemet C1210C105K3RACTU Yes Yes C7 1 Debounce Cap 10 nF 10% 805 Yageo CC0805KRX7R9BB103 D1, D2 2 Schottky Rectifier 3 A/40 V − SMA ON Semiconductor MBRA340T3G No D3−D66 64 OSRAM TOPLED Red − PLCC-2 OSRAM LS T67B S1U1-1-0-30-R18-Z Yes J1−J11, J13 13 Jumper (100 mil spacing) − − JMP Molex-Waldom Electronics Corp 22-28-4103 Yes J12 1 10 SIP Jumper (100 mil spacing) − − SIP10 Molex-Waldom Electronics Corp 22-28-4023 Yes L1 1 Inductor 33 mH/4.5 A 15.24 × 18.54 mm Coilcraft DO5022P-333 Yes Q1 1 PWM Logic − − SOT23 ON Semiconductor MMBT3904LT3G No R1 1 Output Program Resistor 49.9 kW for 28 V 1% 1206 Vishay CRCW120649K9FKEA Yes R2 1 Timing Resistor NU NU NU NU NU Yes R3 1 Output Program Resistor 2.32 kW 1% 1206 Vishay CRCW12062K32FKEA Yes R4, R7−R9, R11 5 Resistor 10 kW 1% 805 Vishay CRCW080510K0FKEA Yes R5 1 Peak Current Sense Resistor 0.08 W 1% 2512 Vishay WSL2512R0800FEB Yes R6 1 Pull up Resistor 10 kW 1% 1206 Vishay CRCW120610K0FKEA Yes R10 1 Current Program Resistor 4.3 kW (25 mA) 5% 805 Panasonic − ECG ERJ-6GEYJ432V Yes SW1 1 Power Switch − − C&K_7101 C&K 7101SYCQE Yes TP1, TP3−TP8 7 Connector Posts − − TURRET Vector Electronics K24C/M Yes TP2 1 Test Via NU NU NU NU NU Yes U1 1 NCV3163 − − SOIC16W EPAD ON Semiconductor NCV3163PWG No U2 1 NTD2955 − − DPAK ON Semiconductor NTD2955T4G No U3 1 NCV7680 − − SOIC16W EPAD ON Semiconductor NCV7680PDWG No ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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