NCV7683GEVB NCV7683GEVB Evaluation Board User'sManual Eight (8) Channel Enhanced 100 mA Linear Current Regulator and Controller for Automotive LED Lighting in Daisy Chain Sequencing Application Evaluation Board User’s Manual Description www.onsemi.com EVAL BOARD USER’S MANUAL Features • Sequencing Functionality • One Out, All Out (Latch Off) Optional Functionality • STOP, TAIL, TURN (100% Duty Cycle, PWM, Automotive Rear Combination LED Lighting systems often require the electronics to execute a sequence lighting event for a blinker function to indicate directional change in movement. This evaluation board will demonstrate to the user this functionality using NCV7683 devices in a daisy chain fashion along with the typical DC current drive and PWM demonstration. The three typical control inputs into the system are available through on−board switches or through the pin connections to external controls. The three system control inputs are the STOP, TAIL, and TURN functions. The STOP function displays a 100% duty cycle current through the LEDs. The TAIL function displays a programmable PWM current through the LEDs. The TURN function displays the sequence event through the 8 on−chip channels and through a serial connection through a second series of 8 channels on a second device. Sequencing) Modes • Flexibility for ♦ ♦ ♦ ♦ ♦ ♦ ♦ External LED Connections LED Current Programmability (RSTOP) LED PWM Programmability (RTAIL) Sequence Time Programmability Sequence Interval Programmability STOP, TAIL, TURN External Connections External DIAG Pin Connection Figure 1. Evaluation Board Picture © Semiconductor Components Industries, LLC, 2015 July, 2015 − Rev. 1 1 Publication Order Number: EVBUM2297/D NCV7683GEVB Sequencing (TURN) outputs increase the current capabilities of each string. Combining 2 outputs increase the current capability from 100 mA to 200 mA. Internal timing circuitry to the output of SEQOUT insures String4 is fully illuminated before the turn−on signal is transferred out to IC2. Programming features of the NCV7683 allow for the programmed pairs to turn−on at the same time. Additional combinations of combined outputs are also designed into the part. Consult the datasheet for further details. The major focus of this evaluation board and the NCV7683 is the ability of the device to perform an LED drive sequencing function whereby each string of LEDs is illuminated in a predictive increasing succession. Figure 2 shows the main component connections which are utilized for this function. The combined pair of paralleled outputs of the IC1 are first turned on, and the signal is carried through to IC2 from the output of IC1 (SEQOUT) in a daisy chain fashion to the input of IC2 (EN). Parallel combinations of Ballast Transistor Ballast Transistor LED Loads String 1 VP SEQON EN Vbat GND LED Loads String 2 String 3 String 4 String 5 OUT1/2 OUT3/4 VP SEQON OUT5/6 OUT7/8 EN GND SEQOUT NCV7683 IC1 Daisy Chain Connectrion String 6 String 7 String 8 OUT1/2 OUT3/4 OUT5/6 OUT7/8 SEQOUT IC2 NCV7683 LED Sequence 1...2...3...4...5...6...7...8 Figure 2. Focus Demonstration 100 STOP Iout OUTPUT CURRENT (mA) The STOP function displays the highest system output current at 100% duty cycle. Using the STOP switch activates this function. An alternative connection The current is programmable with a resistor on the RSTOP pin to ground. Jumpers J12 and J15 provide isolation of pin 5 of the NCV7683 allowing access to the pin for alterative selection of output current. The range of programmability is from 15 mA to 100 mA using the equation: Iout + 150 RSTOP 90 80 70 60 50 40 30 20 10 0 where RSTOP is the resistor value. T = 25°C 0 1 2 3 4 5 6 7 RSTOP (kW) Figure 3. Iout vs. RSTOP www.onsemi.com 2 8 9 10 NCV7683GEVB TAIL Latch Off (“One out, All out) The TAIL function displays a lower equivalent output current in the system. This provides a lower illumination of the LEDs. This is achieved with a varied duty cycle of the output current. The duty cycle is programmable with a resistor on the RTAIL pin to ground. Jumpers J13 and J16 provide isolation of pin 6 of the NCV7683 allowing access to the pin for alternative selection of output duty cycle current. The range of programmability is from 0% duty cycle to 100% duty cycle using the equation: To improve user aesthetics, the system design can utilize the Latch Off function. When using Latch Off, all outputs will become latched off when any one of the 8 outputs experiences an open circuit condition. This is defined (at 50 mA) in the electrical parameter “Open Circuit Detection Threshold” and has limits between 35% and 65% of the output current. The NCV7683 eval board has a switch for Latch off. The Latch off function is activated with the switch up and deactivated with the switch down. The Latch off switch provides direct access to the LObar pin on the NCV7683. Grounding the LObar pin on the IC enables the function. RTAIL + 1.8 RSTOP (DC)0.22) where DC = duty cycle expressed in fractional form. 100 DIAG 90 The DIAG pin of the NCV7683 provides system feedback for conditions: 1. Output open circuit. 2. Set Back Current Limit down 20%. 3. Thermal shutdown. 4. RSTOP Current Limit. DUTY CYCLE (%) 80 70 60 50 40 An LED indicator with a current setting resistor provides illumination of these conditions. Jumper J19 and TP9 provide access to these pins for the user to use off−board. 30 20 10 0 External LEDs 0 1 2 3 4 5 6 7 The NCV7683GEVB is compatible for use with external LEDs. To use external diodes driven from IC1, 1. Remove J9 (Vstring) 2. Replace with the Anode of your external LED string (connect to the post on the right). 3. Remove your selection of J1−J4 (OUTx,y). 4. Connect the Cathode of your external LED string (connect to the post on the right). RTAIL (kW) Figure 4. Duty Cycle vs. RTAIL Sequence Time The sequence time is defined as the time from OUT1 turn on to SEQOUT going low and is programmable through the SEQTIME pin using a resistor to ground. Jumpers J14 and J17 provide isolation of pin 7 of the NCV7683 allowing access to the pin for alternative selection of sequence time. The range of programmability is from 5 msec to 50 msec using SEQTIME resistor values of 1 K to 10 K where 1 K will program 5 msec and 10 K will program 50 msec. 50 45 40 TIME (msec) 35 30 25 20 15 10 5 0 0 1 2 3 4 5 6 7 8 9 10 RSEQTIME (kW) Figure 5. (Sequence Time / Re−Enable Time) vs. RSEQTIME www.onsemi.com 3 NCV7683GEVB The operation of the NCV7684 evaluation board works as a standalone presentation for the customer highlighting the built−in sequencing function often used in automotive turn signals. Jumpers are provided for flexibility of customer specific designs with external LEDs and programming of the current, duty cycle, sequencing time, and sequencing output combinations. External control points are also provided in addition to the on−board control switches. The user must adhere to the absolute maximum ratings when using off−board connections. Table 1. ABSOLUTE MAXIMUM RATINGS Rating Value Unit Supply Voltage to board (Vbat) −40 to 40 V STOP, TAIL, TURN −40 to 40 V 200 mA Output Pin Voltage OUT1,2, OUT3,4, OUT5,6, OUT7,8) −0.3 to 40 V Output Pin Voltage (RTAIL, RSTOP, SEQTIME) −0.3 to 3.6 V DIAG −0.3 to 40 V Vstring −0.3 to 40 V Junction Temperature (NCV7683) −40 to 150 °C Junction Temperature (Evaluation Board) −40 to 105 °C LED Current Source (OUT1,2, OUT3,4, OUT5,6, OUT7,8) 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. Table 2. RECOMMENDED BOARD OPERATING CONDITIONS Value Min Rating Max Unit 28 V 200 mA 150 °C External Supply Voltage (Vbat) LED Current Source Junction Temperature (NCV7683) −40 Table 3. PIN FUNCTION DESCRIPTION Connector Pin Number Terminal Name Power J11, Vbat Vbat Power supply input voltage (14V). J24, GND GND Ground. J12, J15 RSTOP Programmable DC current. J13, J16 RTAIL Programmable duty cycle. J14, J17 RSEQ Programmable sequence time. J9, J10 VSTRING Connection to LED ANODES. J19 DIAG J18 Sequence Repeat On Jumper 18 (without J50) repeats sequence function. J50 Sequence Repeat Off Jumper J50 (without J18) displays a single sequence event. J1, J2, J3, J4 OUT1,2, OUT3,4, OUT5,6, OUT7,8 Current outputs for IC1. J5, J6, J7, J8 OUT1,2, OUT3,4, OUT5,6, OUT7,8 Current outputs for IC2. Test Points Description DIAG Open Drain output (IC1 & IC2). www.onsemi.com 4 NCV7683GEVB User Interface Locations This lists all the user options available on the evaluation board. Figure 6 shows all the user interface locations. Figure 6. User Interface Locations Orange (4) − OUT1,2, OUT3,4, OUT5,6, OUT7,8 output posts (IC2). Yellow (2 sets) – SEQ1, SEQ2 switches. Bright Green – Latch Off switch. Bright Red – DIAG jumper / post. Brown – Sequence Repeat on / off jumpers. Black − STOP, TAIL, TURN external connections. Grey – STOP, TAIL, TURN switches. Dark Blue (2) – STOP programming jumper. Red (2) – TAIL programming jumper. Green (2) – SEQTIME jumper. Purple (2) – Vstring jumper. Light Blue (4) – OUT1,2, OUT3,4, OUT5,6, OUT7,8 open circuit jumpers (IC1). OPERATIONAL GUIDELINES The material necessary to successfully use the evaluation board is listed below. • NCV7683 Evaluation Board • 14V Power Supply Capable of drive 1A. Reference the STOP section. Change the Duty Cycle Change the duty cycle programming resistor. Reference the TAIL section. Configure the Board Change the Sequence Time Change the Sequence time resistor. Reference the Sequence Time section. Typical Board configuration with on−board components. 1. Connect all jumpers on the board with the exception of Jumper 50. This includes J1−J20. This sets the board up to display sequencing. To use the board without sequencing, remove Jumper 18 (“sequence repeat on”), and connect Jumper 50 (“sequence repeat off”). 2. Connect the 14 V power supply. 3. Turn on the power supply. Latch Off Switch up – Latch Off activated. Switch down – Latch Off deactivated. DIAG The on−board LED will illuminate when DIAG reports a fault. Reporting can be taken off−board. Increasing the LED current Change the current programming resistor. Use External LEDs Reference the External LEDs section for instructions. www.onsemi.com 5 NCV7683GEVB BILL OF MATERIALS Table 4. NCV7683 DAISY CHAIN EVALUATION BOARD BILL OF MATERIALS Qty Description Value Tolerance Footprint Manufacturer Manufacturer Part Number Substitution Allowed C1, C2 2 Loop Stabilization Capacitor 0.22 mF 10% 0805 KEMET C0805C224K5RACTU Yes C3, C4 2 Input Capacitor 0.68 mF 10% 0805 KEMET C0805C684K5RACTU Yes C5, C6 2 Debounce Capacitor 10 nF 10% 0805 KEMET C0805C103K5RACTU Yes C10, C11 2 LED Storage Capacitor 100 nF 10% 0805 KEMET C0805C104K5RACTU Yes D1−D24 24 Display LEDs led_diode −−− G6SP OSRAM LRG6SP−CADB−1−1 Yes D25−D29 5 Steering Diode MRA4003 −−− SMA_DIODE ON Semiconductor MRA4003T3G Yes D30, D31 1 DIAG Reporting LED led_diode −−− 0805 LITE−ON INC LTST−C171GKT Yes J1−J4, J9, J10, J12−J19, J50 15 Jumper Posts 100 mil spacing JUMPER −−− JMP 3M 961102−6404−AR Yes J1−J4, J9, J10, J12−J19, J50 15 Jumper −−− −−− N/A SULLINS CONNECTOR SOLUTIONS QPC02SXGN−RC Yes J5−J8 4 Jumper 300 mil spacing JUMPER −−− JMP300 MILL−MAX 999−11−113−10−000000 Yes J11 1 Banana Jack Vbat −−− BANANA CINCH CONNECTIVITY SOLUTIONS 108−0740−001 Yes J24 1 Banana Jack GND −−− BANANA CINCH CONNECTIVITY SOLUTIONS 108−0740−001 Yes Q1, Q2 2 Sequencing Transistor Switch 2N7002W −−− SOT23M4 ON Semiconductor ONC 2N7002WT1G/BKN Yes R1, R2, R22 3 Logic Resistors 1K 1% 0805 VISHAY DALE CRCW08051K00FKEA Yes R3, R4, R7, R10, R17−R21, R25 12 Logic & Programming Resistors 10K 1% 0805 VISHAY DALE CRCW080510K0FKEA Yes R5, R8 2 RSTOP Program Resistor 3.01K 1% 0805 VISHAY DALE CRCW08053K01FKEA Yes R6, R9 2 RTAIL Program Resistor 1.62K 1% 0805 VISHAY DALE CRCW08051K62FKEA Yes R11, R13 2 Vstring Program Resistor 9.53K 1% 0805 VISHAY DALE CRCW08059K53FKEA Yes R12, R14 2 Vstring Program Resistor 1K 1% 0805 VISHAY DALE CRCW08051K00FKEA Yes R15 1 DIAG LED Current Setting Resistor 4.99k 1% 0805 VISHAY DALE STOP −−− MINITOGGLE C&K COMPONENTS T101MH9CBE Yes Designator Yes CRCW08054K99FKEA SW1−SW8 8 User Interface Switches TP6−TP8 3 RCL Test Inputs −−− −−− TP KEYSTONE ELECTRONICS 5010 Yes TP9 1 DIAG Pin Test Point −−− −−− TP KEYSTONE ELECTRONICS 5010 Yes U1, U2 2 NCV7683 (SSOP−24 epad) −−− −−− SSOP24NB_ EP ON Semiconductor NCV7683DQR2G No U3, U4 2 NVD2955 −−− −−− DPAK3_SMD ON Semiconductor NVD2955T4G No www.onsemi.com 6 NCV7683GEVB SCHEMATIC D25 MRA4003 D26 MRA4003 TP6 J9 D27 NTD2955 U3 1 SW1 STOP TP7 SW2 TAIL TP8 2 R1 1K D28 MRA4003 D29 SW3 TURN D3 led_diode D6 led_diode D9 led_diode D12 led_diode D2 led_diode D5 led_diode D8 led_diode D11 led_diode D1 led_diode D4 led_diode D7 led_diode D10 led_diode 1 MRA4003 R15 4.99K J50 1 J4 2 1 J3 2 J2 2 J1 3 2 R22 1K 1 1 D30 led_diode 1 2 2 J19 R25 10K 1 R21 10K R17 R18 10K 10K SW4 SEQ1 SW5 SEQ2 R5 R6 1 2 3 4 5 6 7 8 9 10 11 12 3.01K 1 J12 2 1.62K 1 J13 R11 9.53K U1 SW8 LObar 2 DIAG STOP SEQ1 SEQ2 LObar RSTOP RTAIL SEQTIME OUT8 OUT1 OUT2 OUT7 OUT6 OUT3 OUT5 OUT4 GND_Signal 24 23 22 21 20 19 18 17 16 15 14 13 NCV7683 R7 25 1 1 MRA4003 2 J11 Vbat 10K 1 J14 2 Figure 7. Evaluation Board Schematic (1/2) www.onsemi.com 7 R3 10K R12 1K NCV7683GEVB J10 NTD2955 U4 1 2 R2 1K D14 led_diode D17 led_diode D20 led_diode D23 led_diode D13 led_diode D16 led_diode D19 led_diode D22 led_diode TP9 J8 2 2 J7 2 J6 2 J5 1 D24 led_diode 1 D21 led_diode 1 D18 led_diode 1 D15 led_diode R19 10K R20 10K 1 SW6 SEQ1’ J18 SW7 SEQ2’ R13 9.53K U2 R8 J15 3.01K 1 R9 2 J16 1.62K 1 2 R12 1K 1 2 3 4 5 6 7 8 9 10 11 12 DIAG STOP SEQ1 SEQ2 LObar RSTOP RTAIL OUT1 OUT2 OUT6 OUT3 OUT5 OUT4 GND_Signal 24 23 22 21 20 19 18 17 16 15 14 13 2 R11 9.53K R4 3 1 10K 2 R14 1K NCV7683 J17 10K 1 25 R10 2 Figure 8. Evaluation Board Schematic (2/2) ON Semiconductor and the are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: [email protected] N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5817−1050 www.onsemi.com 8 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative EVBUM2297/D