NCV887300LEDGEVB NCV887300 Automotive Grade High‐frequency Dimmable LED Boost Controller Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Description Key Features This NCV887300 evaluation board provides a convenient way to evaluate a high-frequency LED Boost converter design. No additional components are required, other than dc supplies for the input and enable voltages. An external clock can be used to synchronize the switching frequency. It is configured as a 60 mA output current source with a 1 MHz switching frequency over the typical 6 V to 18 V automotive input voltage range. On board overvoltage protection is provided. The design is 1000:1 dimming ratio capable. The dimming frequency interface circuit may be configured to accept an 1.8 V or a 3.3 V/5 V control signal. 60 mA Output Current Source 1000:1 Dimming Ratio Overvoltage Protection 1 MHz Switching Frequency Input Undervoltage Lockout Internal Soft-Start Wide Input Voltage of 6 V to 18 V Regulates through Load Dump Conditions External Clock Synchronization up to 1.1 MHz Automotive Grade Figure 1. NCV887300 LED Evaluation Board Semiconductor Components Industries, LLC, 2013 May, 2013 − Rev. 2 1 Publication Order Number: EVBUM2181/D NCV887300LEDGEVB Table 1. EVALUATION BOARD TERMINALS Terminal Function VIN Positive DC Input Voltage GND Common DC Return VOUT Regulated DC Output Voltage EN/SYNC Enable and Synchronization Input Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND) Rating Value Unit DC Supply Voltage (VIN) −0.3 to 40 V DC Supply Voltage (EN, SYNC) −0.3 to 6 V Junction Temperature (NCV8902) −40 to 150 C Ambient Temperature (Evaluation Board) −40 to 105 C Table 3. ELECTRICAL CHARACTERISTICS (TA = 25C, 6 V VIN Vout_LED, VEN = 2 V, unless otherwise specified) Characteristics Conditions Typical Value Unit R3 = 3.32 W 60 mA Switching Frequency − 1000 kHz Soft-start Time − 1.66 ms SYNC Frequency Range − 1.0−1.1 MHz Average Current Limit (Load) − 0.06 A Cycle-by-cycle Current Limit (FET) − 0.95 A VIN Decreasing 3.05 V TA Increasing 170 C REGULATION Load Current (Adjustable via R3) SWITCHING CURRENT LIMIT PROTECTIONS Input Undervoltage Lockout (UVLO) Thermal Shutdown http://onsemi.com 2 NCV887300LEDGEVB Operational Guidelines 1. Connect a DC input voltage, within the 6 V to 40 V range, between VIN and GND. 2. Connect a DC enable voltage, within the 2.0 V to 5.0 V range, between EN/SYNC and GND. 3. Connect a function generator between PWM and GND. It is recommended the waveform be set to: 125−200 Hz Square Typical Frequency Range Low State Voltage of 0–0.8 V High State of 1.8−5 V Range Duty Cycle from 0.1% to 100% 4. Overvoltage may be tested by enabling the board (EN/SYNC) with jumper J1 removed. 5. Optionally: for external clock synchronization, connect a pulse source between EN/SYNC and GND. The high state level should be within the 1.8 to 5 V range*, and the low state level within the −0.3 V to 0.8 V range, with a minimum pulse width of 40 ns and a frequency within the 1 MHz and 1.1 MHz range. Jumper J1 should be removed if an external load is to be used instead of on-board LEDs. Input voltage operating range is valid for loads requiring Vout < 40 V. Optional Load (Must Remove J1) Vin + − PWM Dimming Venable + − Figure 2. Evaluation Board Connections *The dimming frequency interface circuit may be configured to accept either an 1.8 V or a 3.3 V/5 V control signal (refer to schematic). For a 1.8 V signal, use BOM and schematic as is. For a 3.3 V/5 V control signal, components R8, R9, R10, R11, Q6 are optional (R14 = 3.01K if mentioned components are removed). http://onsemi.com 3 NCV887300LEDGEVB TYPICAL PERFORMANCE − START-UP VOUT VOUT EN EN Figure 3. Typical Start-up with VIN = 6 V, 10 LEDs/60 mA Figure 4. Typical Start-up with VIN = 12 V, 10 LEDs/60 mA PWM GDRV VOUT VFB VC EN Figure 5. Typical Start-up with VIN = 18 V, 10 LEDs/60 mA Figure 6. Converter Operation during Dimming, VIN = 12 V, 10 LEDs/60 mA PWM GDRV VFB VC Figure 7. Converter Operation during 200 Hz 1000:1 Dimming, VIN = 12 V, 10 LEDs/60 mA http://onsemi.com 4 NCV887300LEDGEVB SCHEMATIC Figure 8. NCV887300 Boost LED Evaluation Board Schematic (Applicable to PCB Rev 1.0 dated 08/11/2011) Figure 9. NCV887300 Boost LED Evaluation Board Schematic (Applicable to PCB Rev 1.0 dated 02/27/2013) http://onsemi.com 5 NCV887300LEDGEVB PCB LAYOUT Figure 10. Top View Figure 11. Bottom View http://onsemi.com 6 NCV887300LEDGEVB Table 4. BILL OF MATERIALS Reference Designator(s) Quantity Description Value C1 1 OPEN Do Not Populate C2 1 CAP CER 1000 pF 50 V X7R 0603 C3 1 C4 Manufacturer’s Part Number Tolerance Manufacturer 1000 pF, 50 V 10% Murata Electronics North America GCM188R71H102KA37D CAP CER 4.7 pF 50 V NP0 0603 4.7 pF, 50 V 5% Murata Electronics North America GCM1885C1H4R7CZ13D 1 OPEN Do Not Populate C5 1 CAP CER 2.2 mF 50 V X7R 1206 2.2 mF, 50 V 10% Murata Electronics North America GRM31CR71H225KA88L C6 1 CAP CER 1 mF 16 V 10% X7R 0805 1 mF, 16 V 10% Kemet C0805C105K4RACAUTO C7 1 CAP CER 0.1 mF 50 V 10% X7R 0805 0.1 mF, 50 V 10% Murata Electronics North America GRM21BR71H104KA01L C8 1 CAP CER 4.7 mF 50 V 10% X5R 0805 4.7 mF, 50 V 10% TDK Corporation CGA4J3X5R1H475K125AB C9 1 OPEN Do Not Populate D1 1 Diode Ultra Fast 2 A 100 V SMA 100 V, 2 A N/A ON Semiconductor MURA110T3G D2 through D11 10 LED DURIS P5 29 LM 4000K N/A N/A OSRAM Opto Semiconductor Inc GW DASPA1.EC−GUHQ−5L7N−1D12 D12, D13, D14 3 Diode SGL JUNC 100 V 4.0NS MELF N/A N/A ON Semiconductor MMSD4148T1G D15 1 Diode Zener 33 V 220 MW SOD−323 33 V 5% ON Semiconductor MM3Z33VT1G J1 1 CONN HEADER 2POS.100 VERT GOLD N/A N/A Molex Connector Corporation 22−28−4023 1 CONN JUMPER SHORTING GOLD N/A N/A Sullins Connector Solutions SSC02SYAN L1 1 SMT Power Inductor 3.3 mH 1.33 A Isat 3.3 mH 20% Coilcraft Inc MSS5131−332MLB Q1 1 MOSFET N-CH 60 V 20 A m8FL 60 V, 20 A N/A ON Semiconductor NVTFS5826NL Q2 1 PNP, Small Signal, −40 V, SOT−23 −40 V, 0.2 A N/A ON Semiconductor MMBT3906LT1G Q3 1 MOSFET 50 V 200 mA 3.5 W N-channel SOT−23 50 V, 0.2 A N/A ON Semiconductor BSS138LT1G Q4 1 MOSFET 30 V 250 mA 1.5 W Dual N-channel 30 V, 0.25 A N/A ON Semiconductor NTJD4001N Q5, Q6 2 NPN, Small Signal, 40 V, SOT−23 40 V, 0.2 A N/A ON Semiconductor MMBT3904LT1G R1 1 RES 0.0 W 1/8 W 0805 SMD 0W JUMPER Vishay/Dale CRCW08050000Z0EA R2 1 RES 0.43 W 1/4 W 1% 0805 SMD 0.43 W 1% Rohm Semiconductor MCR10EZHFLR430 R3 1 RES 3.32 W 1/4 W 1% 1206 SMD 3.32 W 1% Vishay/Dale CRCW12063R32FKEA R4 1 OPEN Do Not Populate R5 1 RES 11.0 W 1/4 W 1% 1206 SMD 11 W 1% Vishay/Dale CRCW120611R0FKEA R6, R16 2 RES 10 kW 1/10 W 1% 0603 SMD 10.0 kW 1% Vishay/Dale CRCW060310K0FKEA R7 1 RES 18.2 kW 1/10 W 1% 0603 SMD 18.2 kW 1% Vishay/Dale CRCW060318K2FKEA R8, R10, R11 3 RES 3.01 kW 1/10 W 1% 0603 SMD 3.01 kW 1% Vishay/Dale CRCW06033K01FKEA R9, R12, R17 3 RES 1.00 kW 1/10 W 1% 0603 SMD 1.00 kW 1% Vishay/Dale CRCW06031K00FKEA R13 1 RES 499 W 1/10 W 1% 0603 SMD 499 W 1% Vishay/Dale CRCW0603499RFKEA R14 1 OPEN Do Not Populate http://onsemi.com 7 NCV887300LEDGEVB Table 4. BILL OF MATERIALS (continued) Reference Designator(s) Quantity Description Value Tolerance Manufacturer Manufacturer’s Part Number R15 1 RES 4.99 kW 1/10 W 1% 0603 SMD 4.99 kW 1% Vishay/Dale CRCW06034K99FKEA R18 1 RES 100 kW 1/10 W 1% 0603 SMD 100 kW 1% Vishay/Dale CRCW0603100KFKEA TP1, TP4, TP7, TP14, TP16, TP17, TP20, TP22 8 PIN INBOARD .42 HOLE 1000/PKG N/A N/A Vector Electronics K24C/M TP2, TP3, TP5, TP6, TP8, TP9, TP15, TP18, TP19, TP21 10 CICRUIT PIN PRNTD .020 D .425 L Do Not Populate Mill-Max Manufacturing Corp. 3128−2−00−15−00−00−08−0 TP10, TP11, TP12, TP13 4 TERM SOLDER TURRET .219 .109 L N/A N/A Mill-Max Manufacturing Corp. 2501−2−00−44−00−00−07−0 U1 1 Automotive Non-Sync Boost Controller N/A N/A ON Semiconductor NCV887300D1R2G U2 1 IC BUFF CMOS LVL/SFTR N-I SOT353 N/A N/A ON Semiconductor M74VHC1GT50DFT1G MNT1, 2, 3, 4 4 Hex Spacer 4−40 1/4 Zinc Plated Steel 3/8 N/A N/A McMaster-Carr 93620A431 4 Hex Nut 4−40 1/4 Zinc Plated Steel N/A N/A McMaster-Carr 90480A005 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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