NCV7680PWR22GEVB

NCV7680PWR22GEVB NCV7680 Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL 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 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 LED’s mounted on the demo board are jumpered giving flexibility for evaluating customer defined loads. • • • Board Features • • • • Part Features • Constant Current Outputs for LED String Drive • Open LED String Diagnostic with Open−Collector • • • On−chip 1 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 Q100 Qualified 16 Lead SOW Exposed Pad Lead−free Packaging • Output Soft Start Eliminates EMI Concerns Low Dropout Operation for Pre−Regulator Applications External Modulation Capable • Tail Input Switch − Outputs are in the PWM Mode STOP Input Switch − Outputs are 100% On 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 Tail Programming Duty Cycle − Programming Resistor can be Adjusted Externally by Jumper Removal Figure 1. NCV7680PWR22GEVB Photo © Semiconductor Components Industries, LLC, 2012 May, 2012 − Rev. 4 1 Publication Order Number: EVBUM2114/D 2 A 2 R1 10K 1 SW SPST SW3 UP = No FET, Resistor in series with FB to VP Down = FET with FB resistors to VP. Physical board layout left= Down & right=UP TP10 GND TP8 GND TP7 DIAG J9 TP5 SI_TP J10 SW SPST C3 10 nF R2 10K MRA4003 MRA4003 D26 2.21K R4 R3 R8 1K 3.09K OUT4 OUT3 OUT2 OUT1 VP SW 3PDT 2 2 VP J12 J11 FB Ballast Drive SW1 C2 1uF J15 HEADER 10 J16 1 1 2 1 R6 1K 1 2 3 4 5 6 7 8 FB TP6 OUT1 VP Ballast Drive FB STOP DIAG RSTOP RTAIL U1EPAD C4 0.22uF U2 1K 1 OUT5 OUT6 OUT7 OUT8 NCV7680 OUT2 OUT3 OUT4 GND OUT5 OUT6 OUT7 OUT8 R7 8.87K J14 16 15 14 13 12 11 10 9 OUT1 J1 C1 1uF 2 OUT3 J3 LED D6 LED D5 LED D4 OUT4 J4 LED D9 LED D8 LED D7 OUT5 J5 LED D12 LED D11 LED D10 OUT6 J6 LED D15 LED D14 LED D13 Date: Size A Title Wednesday, December 09, 2009 Document Number NCV7680_demoboard_new_pinout_rev_B Jumpers 1-8, Enable the customer to put their own LEDs between VP and OUTx. Jumper 9, Switches pull up in and out for DIAG. Jumper 10, Allows easy connection to one supply for Tail and STOP. Jumper 11, RSTOP programming node. Jumper 12, RTAIL programming node. Jumper 13, Boost Regulator connection node. Jumper 14, Loss of ground testing and NCV3065 testing. Jumper 15, in series with VP pin. OUT2 J2 LED D3 LED D2 LED D1 2 1 J13 2 1 R5 NTD2955 1 2 1 D25 VP 2 1 TP4 STOP_Input 2 1 TP1 Diode_OR 2 Sheet 1 SW2 TP9 TI_TP 1 2 1 2 OUT7 J7 LED D18 LED D17 LED D16 2 1 1 TP3 Tail_Input 17 http://onsemi.com 1 2 3 4 5 6 7 8 9 10 Figure 2. NCV7680PWR22GEVB Schematic 1 of OUT8 J8 LED D21 LED D20 LED D19 2 1 TP2 VP 1 Rev C LED D24 LED D23 LED D22 A NCV7680PWR22GEVB NCV7680PWR22GEVB Powering up the Board 2. Position switch 1 (SW1) 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 100% duty cycle (STOP). Equipment Needed − 1 power supply (3/4 Amp) 1. There are 15 jumpers on the board. Start with all 15 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 4. Figure 4. Power Connections Figure 3. Jumper Locations http://onsemi.com 3 NCV7680PWR22GEVB Jumpers 1−8 Jumpers 1−8 highlight the open circuit functionality of diagnostic pin (DIAG). Monitor DIAG while creating an open circuit by removing any on these jumpers (1−8). DIAG functionality will conform to the variables shown in Table 1. Table 1. DIAG Functionality Stop Input Tail Input OUTX Current 1−8 Fault State DIAG State 0 0 OFF − HighZ* 1 0 ISTOP Normal Low 1 0 ISTOP Open String High* 0 1 PWM Don’t Care High* 1 1 ISTOP Normal Low 1 1 ISTOP Open String High* Figure 5. Open Circuit Testing http://onsemi.com 4 NCV7680PWR22GEVB Jumper 9 Figure 6 shows the test setup for using DIAG with a separate supply. 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. Table 2. 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 Output Pin Voltage (OUTX) −0.3 to 45 V Output Pin Current (OUTX) 100 mA −0.3 to 5 V −40 to 150 °C 260 peak °C Input Voltage (RTAIL, RSTOP, FB) Junction Temperature, TJ Peak Reflow Soldering Temperature: Pb−Free 60 to 150 seconds at 217°C (Note NO TAG) V 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. DIAG is tested under the conditions shown below from the NCV7680 datasheet. Table 3. ELECTRICAL CHARACTERISTICS (6 V < VP < 16 V, V, STOP = VP, RSTOP = 3.09 kW, RTAIL = 2.21 kW, −40°C ≤ TJ ≤ 150°C, unless otherwise noted.) Characteristic Min Typ Max Unit DIAG OUTPUT Output Low Voltage DIAG Active, IDIAG = 1 mA − 0.1 0.4 V Output Leakage Current VDIAG = 5 V − − 10 mA Figure 6. DIAG Connection http://onsemi.com 5 NCV7680PWR22GEVB Jumper 10 After removing jumper 10, connect 2 power supplies as shown in Figure 7. Using jumper 10 allows the use of one power supply for both the Tail and STOP functions. Removing J10 allows the use of separate supplies for the Tail Input and the STOP Input. Figure 7. http://onsemi.com 6 NCV7680PWR22GEVB Jumpers 11 and 12 Jumpers 11 and 12 allow the user to program the LED 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 + 100 R STOP_BIAS_Voltage R STOP R TAIL + 4 (eq. 1) R STOP_BIAS_Voltage + 1.08 V (typ) Figure 8. Programming Resistors http://onsemi.com 7 R STOP (DC ) 0.1) (eq. 2) NCV7680PWR22GEVB Jumper 13 on the board edge. Figure 10 highlights an alternative connection. Note, two channels are shown in Figure 10 disconnecting jumpers 1, 2, and 13. This can be expanded for all 8 channels. Jumper 13 disconnects the common top anode connection of the LED’s. When used with jumpers 1−8 allows the user to drive external LED’s. Figure 9 highlights using the connections Figure 9. External LED’s Figure 10. External LED’s (alt. connection) (two channels shown) http://onsemi.com 8 NCV7680PWR22GEVB Isolation of VP using jumper 13 will also allow the use of a boost converter to add additional headroom for more LEDs in a string. See Figure 11 for setup. Figure 11. Voltage Boost Jumper 14 Jumper 15 Jumper 14 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 15 is a series connection for VP. This can be used to measure the quiescent current of the NCV7680. Remove jumper 15 and put an ammeter between the pins of the jumper. Table 4. BILL OF MATERIALS (NCV7680PWR22GEVB Evaluation Board) Designator Qty Description Value Tolerance Footprint Manufacturer Manufacturer Part Number Substitution Allowed Pb−Free U1 1 NCV7680 (SOW−16 epad) − − 751R_02_B ON Semiconductor NCV7680PDWG No Yes U2 1 NTD2955 − − DPAK3_SMD ON Semiconductor NTD2955T4G No Yes U3, (D25, D26) 2 MRA4003 − − SMA_DIODE ON Semiconductor MRA4003T3G No Yes D1−D24 24 Superflux LED (Lumileds) Amber N/A LED_SUPERFLUX Philips HPWN−BL00−0002 No Yes C1,C2 2 Input / Output Capacitor 1mF, 50V ("10%) X7R 1210 KEMET C1210C105K3RACTU Yes Yes C3 1 Debounce Capacitor 10nF, 50V ("10%) X7R 0805 AVX 08055C103KAT Yes Yes C4 1 Loop Stabization Capacitor 0.22mF, 50V ("10%) X7R 0805 Murata GCM21BR71H224KA37L Yes Yes R1, R2 2 Logic I/O Resistor 10k 1% 0805 Yageo America RC0805FR−0710KL Yes Yes R3 1 Stop Current Program Resistor 3.09k 1% 0805 Yageo America RC0805FR−073K09L Yes Yes R4 1 Tail Current Program Resistor 2.21k 1% 0805 Yageo America RC0805FR−072K21L Yes Yes R7 1 VP Program Resistor 8.87k 1% 0805 Yageo America RC0805FR−078K87L Yes Yes R5, R6, R8 3 VP Support Resistor 1k 1% 0805 Yageo America RC0805FR−071KL Yes Yes J16 1 Jumper Posts (SIP 10), 100mill spacing − − SIP10 Molex−Waldom Electronics Corp 22−28−4103 Yes Yes http://onsemi.com 9 NCV7680PWR22GEVB Table 4. BILL OF MATERIALS (NCV7680PWR22GEVB Evaluation Board) Manufacturer Part Number Substitution Allowed Pb−Free Molex−Waldom Electronics Corp 22−28−4023 Yes Yes Designator Qty Description Value Tolerance Footprint Manufacturer J1−J15 30 Jumper Posts 100 mil spacing − − JMP J1−J15 15 Jumper − − − Sullins Electronic Corp SSC02SYAN Yes Yes TP1−TP10 10 Connector Posts − − TURRET Vector Electronics K24C/M Yes Yes SW1 1 Ballast FET enable switch (3PDT) − − NKK_3PDT_M2032 NKK of America M2032SS1W03−RO Yes Yes SW2, SW3 2 STOP / Tail control switch (SPDT) − − C&K_7101 C&K 7101SYCQE Yes Yes 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. 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