NCV8871SEPGEVB

NCV8871SEPGEVB NCV8871 Automotive Grade High-Frequency SEPIC Controller Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Description Key Features This NCV8871 evaluation board provides a convenient way to evaluate a high-frequency current-mode control SEPIC converter design. The topology uses two inductors. 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. The output is rated 12 V / 2 A with a 170 KHz switching frequency over the typical 6 V to 18 V automotive input voltage range. • • • • • • • • 12 V / 2 A Output 170 KHz Switching Frequency (NCV887100) Input Undervoltage Lockout Internal Soft-Start Wide Input Voltage of 6 V to 40 V Regulates through 45 V Load Dump Conditions External Clock Synchronization up to 1.1 MHz Automotive Grade Figure 1. NCV887100 SEPIC Evaluation Board © Semiconductor Components Industries, LLC, 2012 July, 2012 − Rev. 4 1 Publication Order Number: EVBUM2080/D NCV8871SEPGEVB 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 Peak Transient Voltage (Load Dump on VIN) 45 V Junction Temperature −40 to 150 °C Ambient Temperature (evaluation board) −40 to 105 °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. Table 3. ELECTRICAL CHARACTERISTICS (TA = 25°C, 4.5 V ≤ VIN ≤ 40 V, VEN = 2 V, VOUT = 3.3 V, 0 ≤ IOUT ≤ 1.2 A, unless otherwise specified) Characteristic Conditions Typical Value Unit Switching Frequency 170 KHz Soft−start Time 7.4 ms 170 − 1025 KHz 10 A Switching SYNC Frequency Range Current Limit Cycle-by-cycle Current Limit (FET) Protections Input Undervoltage Lockout (UVLO) VIN decreasing < 6* V Input Undervoltage Lockout (UVLO) VIN increasing 6.7 V Thermal Shutdown TA increasing 170 °C *See Note 3 from Operational Guidelines (on next page) http://onsemi.com 2 NCV8871SEPGEVB OPERATIONAL GUIDELINES VIN, and will be less than 6 V when operating below rated output current. 4. Optionally for external clock synchronization, connect a pulse source between EN/SYNC and GND. The high state level should be within the 2 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 170 and 1100 KHz range. NOTE: The converter was designed for 170 KHz 12 V / 2 A continuous mode operation. Operation beyond 170 KHz and/or at a different output voltage may require modifications of feedback loop component and inductor values. 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. The evaluation board feedback components were selected to for continuous operation at rated 12 V / 2 A output power at a minimum input voltage of 6 V. The NCV887100 VIN has its operational voltage diode-ored between the converter output (12 V) and input voltages. The converter turns-on typically at 6.7 V. Once energized, the output voltage supplies power to the IC when the battery voltage is below (approximately) 11.5 V. The decreasing VIN UVLO voltage depends on load current as well as Vin Venable Figure 2. Evaluation Board Connections http://onsemi.com 3 NCV8871SEPGEVB TYPICAL PERFORMANCE VOUT EN Figure 3. Typical Start−up with VIN = 12 V, ROUT = 6 W IL1 IL2 VDS Figure 4. Operational Waveforms, VIN = 12 V, ROUT = 6 W http://onsemi.com 4 NCV8871SEPGEVB SCHEMATIC Figure 5. NCV887100 SEPIC Evaluation Board Schematic http://onsemi.com 5 NCV8871SEPGEVB Table 4. BILL OF MATERIALS Component Description C1 DO NOT POPULATE Manufacturer P/N Vendor P/N C2 DO NOT POPULATE C3 DO NOT POPULATE C4 DO NOT POPULATE C5 CAP CER 4.7UF 50V 10% X7R 1210 GRM32ER71H475KA88L 490−1864−1−ND C6 DO NOT POPULATE C7 DO NOT POPULATE C8 CAP POLY ALUM 47UF 16V SMD PCG1C470MCL1GS 493−3095−1−ND C9 CAP POLY ALUM 47UF 16V SMD PCG1C470MCL1GS 493−3095−1−ND C10 CAP POLY ALUM 47UF 16V SMD PCG1C470MCL1GS 493−3095−1−ND C11 CAP CER 1UF 50V X7R 1206 GCM31MR71H105KA55L 490−4795−1−ND C12 CAP CER .082UF 10% 16V X7R 0603 0603YC823KAT2A 478−1238−1−ND C13 CAP CER 680PF 50V 5% C0G 0603 GRM1885C1H681JA01D 490−1447−1−ND C14 CAP CER .1UF 50V X7R 0603 GCM188R71H104KA57D 490−4779−1−ND C15 CAP 100UF 50V ELECT FC RADIAL EEU−FC1H101 P10323−ND C16 CAP CER 1UF 16V X7R 10% 0603 GCM188R71C105KA64D 490−5241−1−ND C17 CAP CER .1UF 50V X7R 0603 GCM188R71H104KA57D 490−4779−1−ND D1 60 V, 3.0 A Schottky Rectifier DPAK MBRD360G MBRD360G D2 DIODE SCHOTTKY 40V 1A SOD123FL MBR140SFT1G MBR140SFT1G D3 DIODE SCHOTTKY 40V 1A SOD123FL MBR140SFT1G MBR140SFT1G L1 High Temp SMT Power Inductor 2.3A MSS1260T−223ML MSS1260T−223ML L2 High Temp SMT Power Inductor 1.9A MSS1038T−223ML MSS1038T−223ML Q1 N−CHANNEL MOSFET, LOGIC LEVEL, 60V 16mOHMS NVD5865NL NVD5865NL R1 RES 5.10 OHM 1/8W 1% 0805 SMD CRCW08055R10FKEA 541−5.10CCCT−ND R2 RES .04 OHM 3W 1% 2512 SMD CRA2512−FZ−R040ELF CRA2512−FZ−R040ELFCT−ND R3 DO NOT POPULATE R4 RES 90.9K OHM 1/10W 1% 0603 SMD RC0603FR−0790K9L 311−90.9KHRCT−ND R5 RES 10.0K OHM 1/10W 1% 0603 SMD MCR03EZPFX1002 RHM10.0KHCT−ND R6 RES 10.0 OHM 1/10W 1% 0603 SMD RC0603FR−0710RL 311−10.0HRCT−ND R7 RES 715 OHM 1/10W 1% 0603 SMD CRCW0603715RFKEA 541−715HCT−ND U1 ON SEMI Non−Sync Boost Controller NCV887100 NCV887100D1R2G http://onsemi.com 6 NCV8871SEPGEVB PCB LAYOUT Figure 6. Top View Figure 7. Bottom View http://onsemi.com 7 onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. The evaluation board/kit (research and development board/kit) (hereinafter the “board”) is not a finished product and is not available for sale to consumers. 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