EVBUM2297 - NCV7683GEVB Evaluation Board User`s Manual
Contents
1. String 1 String 3 String 4 A Vv SEQON OUTS5 6 OUT7 8 SEQOUT GN Daisy Chain Connectrion 76 161 Ballast Transistor 1 String 5 String 6 String 7 String 8 we EQON SEO OUT5 6 OUT7 8 a SEQOUT 2 LED Sequence 1 2 3 4 5 6 7 8 Figure 2 Focus Demonstration STOP 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 150 RSTOP where RSTOP is the resistor value lout 100 90 80 70 60 50 40 30 20 10 lout OUTPUT CURRENT mA 1 2 3 4 5 6 7 8 9 10 RSTOP kQ Figure 3 lout vs RSTOP www onsemi com NCV7683GEVB TAIL 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 wit2. 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 Publication Order Number EVBUM2297 D NCV7683GEVB Sequencing TURN 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 are first turned on and the signal is carried through to IC2 from the output of IC SEQOUT in a daisy chain fashion to the input of IC2 EN Parallel combinations of 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 ast Transistor LED Loads _ _ String 2
3. 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 Sh
4. SW8 8 User Interface STOP MINITOGGLE C amp K T101MH9CBE Switches COMPONENTS TP6 TP8 3 RCL Test Inputs KEYSTONE 5010 ELECTRONICS TP9 1 DIAG Pin Test KEYSTONE 5010 Yes Point ELECTRONICS U1 U2 2 NCV7683 SSOP24NB _ ON Semiconductor NCV7683DQR2G No SSOP 24 epad EP U3 U4 NVD2955 ON Semiconductor NVD2955T4G No www onsemi com 6 Vbat TPE 7 TURN 025 RA4003 026 RA4003 027 RA4003 028 RA4003 D29 RA4003 NCV7683GEVB SCHEMATIC NTD2955 U3 D3 led_diode D2 led_diode D1 D30 led_diode led_diode seo ovar seorme Signal NCV7683 Figure 7 Evaluation Board Schematic 1 2 www onsemi com 7 06 led_diode 05 led_diode D4 led_diode D9 led_diode D8 led_diode 07 led_diode D12 led_diode pin led_diode D10 led_diode NCV7683GEVB NTD2955 U4 R2 1K D15 led_diode D18 led_diode D21 led_diode D24 led_diode D14 led_diode D17 led_diode D20 led_diode D23 led_diode D13 led_diode D16 led_diode D19 led_diode D22 led_diode J18 1 2 3 4 5 6 7 8 9 10 12 1K 11 12 gma1 NCV7683 Figure 8 Evaluation Board Schematic 2 2 ON Semiconductor and the ON are registered trademarks of Semiconductor Components
5. 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 DIAG 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 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 External LEDs 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 1 4 4 Connect the Cathode of your external LED string connect to the post on the right www onsemi com NCV7683GEVB The operation of the NCV7684 evaluation board works as the current duty cycle sequencing time and sequencing a standalone presentation for the customer highlighting the output combinations External control points are also buil
6. 83 Evaluation Board 14V Power Supply Capable of drive Configure the Board Typical Board configuration with on board components 1 Connect all jumpers on the board with the exception of Jumper 50 This includes 11 120 This sets the board up to display sequencing To use the board without sequencing remove Jumper 18 sequence repeat and connect Jumper 50 sequence repeat off 2 Connect the 14 V power supply 3 Turn on the power supply Increasing the LED current Change the current programming resistor Reference the STOP section Change the Duty Cycle Change the duty cycle programming resistor Reference the TAIL section Change the Sequence Time Change the Sequence time resistor Reference the Sequence Time section 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 Use External LEDs Reference the External LEDs section for instructions www onsemi com NCV7683GEVB BILL OF MATERIALS Table 4 NCV7683 DAISY CHAIN EVALUATION BOARD BILL OF MATERIALS Toler Manufacturer Substitution Designator Qty Description Value ance Footprint Part Number Allowed C1 C2 2 Loop Stabilization 0 22 uF 10 0805 KEMET C0805C224K5RACTU Yes Capacitor 4 C3 Input Capacitor 0 68 uF 10 0805 KEMET C0805C684K5RACTU Yes C5 C6 2 Debounce 10 nF 10 0805 KEME
7. NCV7683GEVB NCV7683GEVB Evaluation Board User s Manual Eight 8 Channel Enhanced 100 mA ON Semiconductor Linear Current Regulator and Controller for Automotive LED Lighting in Daisy Chain Sequencing Application Evaluation Board User s Manual Description 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 www onsemi com EVAL BOARD USER S MANUAL Features Sequencing Functionality One Out Out Latch Off Optional Functionality STOP TAIL TURN 100 Duty Cycle PWM Sequencing Modes Flexibility for External LED Connections LED Current Programmability RSTOP
8. T C0805C103K5RACTU Yes Capacitor C10 C11 2 LED Storage 100 nF 10 0805 KEMET C0805C104K5RACTU Yes Capacitor 01 024 Display LEDs led_diode G6SP OSRAM LRG6SP CADB 1 1 Yes 025 029 Steering Diode MRA4003 SMA DIODE ON Semiconductor MRA4003T3G Yes Yes D30 D31 DIAG Reporting led_diode LITE ON INC LTST C171GKT LED J1 J4 J9 J10 J12 J19 J50 Jumper Posts JUMPER 3M 961102 6404 Yes 100 mil spacing 15 15 J1 J4 J9 Jumper SULLINS QPC02SXGN RC CONNECTOR SOLUTIONS 4 Jumper 300 mil JUMPER JMP300 MILL MAX 999 11 113 10 000000 spacing 1 Banana Jack Vbat CINCH 108 0740 001 CONNECTIVITY SOLUTIONS 1 Banana Jack GND BANANA CINCH 108 0740 001 CONNECTIVITY SOLUTIONS Q1 Q2 2 Sequencing 2N7002W SOT23M4 ON Semiconductor ONC Yes Transistor Switch 2N7002WT1G BKN R1 R2 Logic Resistors 1K 1 0805 VISHAY DALE CRCW08051K00FKEA Yes R22 Yes R3 R7 12 Logic amp 10K 1 0805 VISHAY DALE CRCW080510KOFKEA R10 Programming R17 R21 Resistors R25 5 R8 RSTOP Program 3 01K 1 0805 VISHAY DALE CRCW08053K01FKEA Yes Resistor R6 R9 2 RTAIL Program 1 62K 1 0805 VISHAY DALE CRCW08051K62FKEA Yes Resistor R11 R13 2 Vstring Program 9 53K 1 0805 VISHAY DALE CRCWO08059K53FKEA Yes Resistor V Yes R12 R14 2 Vstring Program 1K SHAY DALE CRCW08051K00FKEA Resistor R15 1 DIAG LED 4 99k SHAY DALE Yes Current Setting CRCW08054K99FKEA Resistor SW1
9. e Jumper J50 without J18 displays a single sequence event Repeat Off J1 J2 J3 OUT1 2 Current outputs for 1 J4 OUT3 4 OUT5 6 OUT7 8 a J5 J6 J7 2 Current outputs for 2 J8 4 www onsemi com 4 NCV7683GEVB User Interface Locations Figure 6 shows all the user interface locations NCV7683 LED CONTROLLER Y On Semiconductor Vbat 9 22292 m 2 SEQ1 amp SEQ2 SWITCHES Ei i GND ON Semiconductor This lists all the user options available on the evaluation board eee opp Ga 5 Fie LED 4 E 4 5 WUA qre w wu we SEN nla _ i Figure 6 User Interface Locations 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 5 6 OUT7 8 open circuit jumpers IC 1 Orange 4 posts IC2 Yellow 2 sets SEQ1 SEQ2 switches Bright Green Latch Off switch Bright Red DIAG jumper post Brown Sequence Repeat on off jumpers OUT1 2 OUT3 4 OUTS 6 OUT7 8 output OPERATIONAL GUIDELINES The material necessary to successfully use the evaluation board is listed below NCV76
10. h 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 RTAIL 1 8 RSTOP DC 0 22 where DC duty cycle expressed in fractional form 100 90 80 N DUTY CYCLE en 0 1 2 3 4 5 6 RTAIL Figure 4 Duty Cycle vs RTAIL N 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 35 30 25 20 15 10 5 0 TIME msec 1 2 3 4 5 6 7 8 9 10 RSEQTIME Figure 5 Sequence Time Time vs RSEQTIME Latch Off One out All out 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
11. ould 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 American Technical Support 800 282 9855 Toll Free Semiconductor Website www onsemi com Literature Distribution Center for ON Semiconductor USA Canada P O Box 5163 Denver Colorado 80217 USA Europe Middle East and Africa Technical Support Order Literature http www onsemi com orderlit Phone 303 675 2175 or 800 344 3860 Toll Free USA Canada Phone 421 33 790 2910 chief Fax 303 675 2176 800 344 3867 Toll Free USA Canada Customer Focus Center For additional information please contact your local Email orderlit onsemi com Phone 81 3 5817 1050 Sales Representative EVBUM2297 D
12. t in sequencing function often used in automotive turn provided in addition to the on board control switches The signals Jumpers are provided for flexibility of customer user must adhere to the absolute maximum ratings when specific designs with external LEDs and programming of using off board connections Table 1 ABSOLUTE MAXIMUM RATINGS SS i ose GIT TR OT RTH Output Pin Voltage OUT1 2 OUT3 4 OUT5 6 OUT7 8 0 3 to 40 Output Pin Voltage RTAIL RSTOP SEQTIME 0 310 3 6 DIAG 0 3 to 40 Junction Temperature NCV7683 40 to 150 Junction Temperature Evaluation Board 40 to 105 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 Rating Min Max Unit External Supply Voltage Vbat 28 V LED Current Source Junction Temperature NCV7683 40 150 Table 3 FUNCTION DESCRIPTION J11 Vbat Power supply input voltage 14V J24 GND Ground Test Points J12 J15 Programmable DC current J13 J16 Programmable duty cycle J14 J17 Programmable sequence time J9 J10 VSTRING Connection to LED ANODES DIAG DIAG Open Drain output IC1 amp IC2 J18 Sequence Jumper 18 without J50 repeats sequence function Repeat On Sequenc
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