NCV7680EVB/D. NCV7680 Evaluation Board Manual EVALUATION BOARD MANUAL
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1 NCV7680 Evaluation Board Manual Prepared by: Frank Kolanko ON Semiconductor EVALUATION BOARD MANUAL Description The NCV7680 is an octal driver designed for automotive 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 Evaluation Board includes both an NCV7680 (octal driver) and NTD2955 (FET). A switch on the board allows the user to evaluate functionality with and without the FET. The DIAG pin is brought out for reporting of open circuit conditions. The s mounted on the demo board are jumpered giving flexibility for evaluating customer defined loads. Part Features Constant Current Outputs for String Drive Open String Diagnostic with Open Collector Output Soft Start Eliminates EMI Concerns Low Dropout Operation for Pre Regulator Applications External Modulation Capable On chip khz Tail PWM Dimming Single Resistor for Stop Current Set Point Single Resistor for Tail Dimming Set Point Overvoltage & Overtemperature Set Back Power Limitation AEC Q00 Qualified 6 Lead SOW Exposed Pad Lead free Packaging Board Features Tail Input Switch Outputs are in the PWM Mode STOP Input Switch Outputs are 00% On DIAG Output Open Circuits are Reported Isolation On board s can be Removed with Jumpers for Alternative Evaluation STOP Programming Current Programming Resistor can be Adjusted Externally by Jumper Removal Tail Programming Duty Cycle Programming Resistor can be Adjusted Externally by Jumper Removal Figure. NCV7680EVB Photo Semiconductor Components Industries, LLC, 200 August, 200 Rev. 3 Publication Order Number: NCV7680EVB/D
2 TP2 VP VP TP9 TP J3 TP3 TI_TP Diode_OR R5 K Tail_Input SW2 D25 NTD2955 U2 J0 SW SPST MRA4003 D26 MRA4003 C2 uf R6 K C4 0.22uF C uf D D4 D7 D0 D3 D6 D9 D22 D2 D5 D8 D D4 D7 D20 D23 SW SPST D3 D6 D9 D2 D5 D8 D2 D24 J5 SW 3PDT J9 J J2 J3 J4 J5 J6 J7 J8 R8 A K TP6 A R2 FB 0K OUT 2 J OUT OUT2 VP OUT3 Ballast Drive OUT4 FB GND STOP OUT5 DIAG OUT6 RSTOP OUT7 8 RTAIL OUT8 9 U EPAD NCV TP4 STOP_Input SW3 SW VP TP5 SI_TP Ballast Drive FB R7 8.87K TP0 GND R 0K C3 0 nf R3 3.09K R4 2.2K 2 J2 J TP7 DIAG TP8 GND UP = No FET, Resistor in series with FB to VP Down = FET with FB resistors to VP. Physical board layout left= Down & right=up OUT4 OUT3 OUT2 OUT VP OUT5 OUT6 OUT7 OUT8 OUT2 OUT3 OUT4 OUT5 OUT6 Jumpers -8, Enable the customer to put their own s between VP and OUTx. Jumper 9, Switches pull up in and out for DIAG. Jumper 0, Allows easy connection to one supply for Tail and STOP. Jumper, RSTOP programming node. Jumper 2, RTAIL programming node. Jumper 3, Boost Regulator connection node. Jumper 4, Loss of ground testing and NCV3065 testing. Jumper 5, in series with VP pin. OUT7 OUT8 Title NCV7680_demoboard_new_pinout_rev_B J6 HEADER 0 Size Document Number Rev A <Doc> C Date: Wednesday, December 09, 2009 Sheet of Figure 2. NCV7680EVB Schematic 2
3 Powering up the Board Equipment Needed power supply (3/4 Amp). There are 5 jumpers on the board. Start with all 5 jumpers connected. Jumper locations are shown in Figure 3. A list of jumper functionality is shown in the board schematic (Figure 2). Typical connections to the evaluation board are shown in Figure Position switch (SW) for either external ballast connection (left) or no external ballast connection (right). 3. Connect the power supply. 4. Toggle switch 2 (SW2) for display of the PWM mode (tail). 5. Toggle switch 3 (SW3) for display of 00% duty cycle (STOP). Figure 3. Jumper Locations Figure 4. Power Connections 3
4 Jumpers 8 Jumpers 8 highlight the open circuit functionality of diagnostic pin (DIAG). Monitor DIAG while creating an open circuit by removing any on these jumpers ( 8). DIAG functionality will conform to the variables shown in Table. Table. DIAG Functionality Stop Input Tail Input OUTX Current 8 Fault State DIAG State 0 0 OFF HighZ* 0 I STOP Normal Low 0 I STOP Open String High* 0 PWM Don t Care High* I STOP Normal Low I STOP Open String High* Figure 5. Open Circuit Testing 4
5 Jumper 9 Jumper 9 disconnects the PC board pullup resistor and allows the user to interface with his own component and power supply to the DIAG pin. Disconnect Jumper 9. 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. MAXIMUM RATINGS (Voltages are with respect to device substrate) Rating Value Unit VP, Ballast Drive, STOP, DIAG DC Peak Transient 0.3 to V Output Pin Voltage (OUTX) 0.3 to 45 V Output Pin Current (OUTX) 00 ma Input Voltage (RTAIL, RSTOP, FB) 0.3 to 5 V Junction Temperature, T J 40 to 50 C Peak Reflow Soldering Temperature: Pb Free 60 to 50 seconds at 27 C (Note NO TAG) 260 peak C 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.. DIAG is tested under the conditions shown below from the NCV7680 datasheet. ELECTRICAL CHARACTERISTICS (6 V < VP < 6 V, V, STOP = VP, RSTOP = 3.09 k, RTAIL = 2.2 k, 40 C T J 50 C, unless otherwise noted.) Characteristic Min Typ Max Unit DIAG OUTPUT Output Low Voltage DIAG Active, I DIAG = ma V Output Leakage Current V DIAG = 5 V 0 A Figure 6. DIAG Connection 5
6 Jumper 0 Using jumper 0 allows the use of one power supply for both the Tail and STOP functions. Removing J0 allows the use of separate supplies for the Tail Input and the STOP Input. After removing jumper 0, connect 2 power supplies as shown in Figure 7. Figure 7. 6
7 Jumpers and 2 Jumpers and 2 allow the user to program the output currents. 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 00 R STOP_BIAS_Voltage R STOP (eq. ) R TAIL 4 R STOP (DC 0.) (eq. 2) R STOP_BIAS_Voltage.08 V (typ) Figure 8. Programming Resistors 7
8 Jumper 3 Jumper 3 disconnects the common top anode connection of the s. When used with jumpers 8 allows the user to drive external s. Figure 9 highlights using the connections on the board edge. Figure 0 highlights an alternative connection. Note, two channels are shown in Figure 0 disconnecting jumpers, 2, and 3. This can be expanded for all 8 channels. Figure 9. External s Figure 0. External s (alt. connection) (two channels shown) 8
9 Isolation of VP using jumper 3 will also allow the use of a boost converter to add additional headroom for more s in a string. See Figure for setup. NCV7680EVB/D Figure. Voltage Boost 9
10 Jumper 4 Jumper 4 is the ground connection for the NCV7680. This can be used to measure ground current of the IC or test for loss of ground conditions. Jumper 5 Jumper 5 is a series connection for VP. This can be used to measure the quiescent current of the NCV7680. Remove jumper 5 and put an ammeter between the pins of the jumper. BILL OF MATERIALS (NCV7680 Demonstration Board) Designator Qty Description Value Tolerance Footprint Manufacturer Manufacturer Part Number Substitution Allowed Pb Free U NCV7680 (SOW 6 epad) 75R_02_B ON Semiconductor NCV7680PDWG No Yes U2 NTD2955 DPAK3_SMD ON Semiconductor NTD2955T4G No Yes U3, (D25, D26) 2 MRA4003 SMA_DIODE ON Semiconductor MRA4003T3G No Yes D D24 24 Superflux (Lumileds) Amber N/A _SUPERFLUX Philips HPWN BL No Yes C,C2 2 Input / Output Capacitor F, 50V ( 0%) X7R 20 KEMET C20C05K3RACTU Yes Yes C3 Debounce Capacitor 0nF, 50V ( 0%) X7R 0805 AVX 08055C03KAT Yes Yes C4 Loop Stabization Capacitor 0.22 F, 50V ( 0%) X7R 0805 Murata GCM2BR7H224KA37L Yes Yes R, R2 2 Logic I/O Resistor R3 Stop Current Program Resistor R4 Tail Current Program Resistor R7 VP Program Resistor R5, R6, R8 3 VP Support Resistor 0k % 0805 Yageo America RC0805FR 070KL Yes Yes 3.09k % 0805 Yageo America RC0805FR 073K09L Yes Yes 2.2k % 0805 Yageo America RC0805FR 072K2L Yes Yes 8.87k % 0805 Yageo America RC0805FR 078K87L Yes Yes k % 0805 Yageo America RC0805FR 07KL Yes Yes J6 Jumper Posts (SIP 0), 00mill spacing J J5 30 Jumper Posts 00 mil spacing SIP0 Molex Waldom Electronics Corp JMP Molex Waldom Electronics Corp Yes Yes Yes Yes J J5 5 Jumper Sullins Electronic Corp SSC02SYAN Yes Yes TP TP0 0 Connector Posts SW Ballast FET enable switch (3PDT) SW2, SW3 2 STOP / Tail control switch (SPDT) TURRET Vector Electronics K24C/M Yes Yes NKK_3PDT_M2032 NKK of America M2032SSW03 RO Yes Yes C&K_70 C&K 70SYCQE Yes Yes 0
11 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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 563, Denver, Colorado 8027 USA Phone: or Toll Free USA/Canada Fax: or Toll Free USA/Canada orderlit@onsemi.com N. American Technical Support: Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: Japan Customer Focus Center Phone: ON Semiconductor Website: Order Literature: For additional information, please contact your local Sales Representative NCV7680EVB/D
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MUN5311DW1T1G Series.
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NSQA6V8AW5T2 Series Transient Voltage Suppressor
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NLAS7213. High-Speed USB 2.0 (480 Mbps) DPST Switch
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P2042A LCD Panel EMI Reduction IC
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AND8289. LED Driving with NCP/V3063
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Figure 1. NCP5104 Evaluation Board
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