NCV890231GEVB NCV890231 Automotive Grade High-Frequency Buck Regulator Evaluation Board User's Manual http://onsemi.com Description The NCV890231 evaluation board provides a convenient way to evaluate a high-frequency buck 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; and the board also provides a synchronization output, enabling it to be used as a master. It is configured for a 3.3 V output with a 2 MHz switching frequency and a 2.0 A maximum output current, over the typical 4.5 V to 18 V automotive input voltage range. In addition, the board regulates up to 30 V thanks to switching frequency foldback. EVAL BOARD USER’S MANUAL Key Features • • • • • • • • 3.3 V Output Voltage 2 MHz Switching Frequency 2.0 A Current Limit Wide Input Voltage of 4.5 V to 45 V Regulates through Load Dump Conditions External Clock Synchronization up to 2.5 MHz Synchronization Output Automotive Grade Figure 1. NCV890231GEVB Board Picture © Semiconductor Components Industries, LLC, 2013 March, 2013 − Rev. 0 1 Publication Order Number: EVBUM2177/D NCV890231GEVB Table 1. DEMONSTRATION BOARD TERMINALS Terminal Function VIN Positive dc input voltage GND Common dc return VOUT Regulated dc output voltage EN Enable input SYNCI Input for external clock synchronization SYNCO Output for synchronizing other boards Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND) Value Units Dc supply voltage (VIN, EN) -0.3 to 45 V V Dc supply voltage (SYNCI) -0.3 to 6 V V Junction Temperature (NCV890231) -40 to 150 °C Ambient temperature (Demo Board) -40 to 85 °C Rating 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 ≤ 2.0 A, unless otherwise specified) Conditions Characteristics Typical Value Units 3.30 V 4 % Regulation Output Voltage Voltage Accuracy Line Regulation IOUT = 1.0 A 0.12 % Load Regulation VIN = 13.2 V 0.03 % Switching Frequency 2.0 MHz Soft-start Time 1.4 ms 1.8 to 2.5 MHz 1.8 A 2.45 A VIN decreasing 4.2 V TA increasing 170 °C Switching SYNCI Frequency range Current Limit VIN = 6 to 18 V Average Current Limit Cycle-by-cycle Current Limit Protections Input Undervoltage Lockout (UVLO) Thermal Shutdown http://onsemi.com 2 NCV890231GEVB Figure 2. NCV890231GEVB Board Schematic Operational Guidelines 1. Connect a dc input voltage, within the 4.5 V to 45 V range, between VIN and GND 2. Connect a load between VOUT and GND 3. Connect a dc enable voltage, within the 4.5 V to 40 V range, between EN and GND 4. Optionally, for external clock synchronization, connect a pulse source between SYNCI and GND. The high state level should be within the 2 to 6 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 1.8 to 2.5 MHz range. IOUT ZOUT VIN VSYNCI VEN Figure 3. NCV890231GEVB Board Connections http://onsemi.com 3 NCV890231GEVB TYPICAL PERFORMANCE Efficiency Figure 4. Efficiency at 2 MHz for a 3.3 V output Start−up Figure 5. Typical start−up with VIN = 13.2 V, VOUT = 3.3 V and IOUT = 0.2 A Figure 6. Typical start−up with VIN = 13.2 V, VOUT = 3.3 V and IOUT = 1.8 A http://onsemi.com 4 NCV890231GEVB Load Transients Figure 7. Load transient 0.1 A to 2.0 A, with VOUT = 3.3 V and VIN = 13.2 V Figure 8. Load transient 0.2 A to 2.0 A, with VOUT = 3.3 V and VIN = 13.2 V Figure 9. Load transient 2.0 A to 0.2 A, with VOUT = 3.3 V and VIN = 13.2 V http://onsemi.com 5 NCV890231GEVB Synchronization SYNCI SYNCO SW VOUT Figure 10. Starting synchronization at 2.5 MHz (from free−running) Minimum on time VOUT VIN 80 ns SW Figure 11. Minimum on time seen during a load transient http://onsemi.com 6 NCV890231GEVB Schematic http://onsemi.com 7 NCV890231GEVB PCB LAYOUT Figure 12. Top View Figure 13. Bottom View http://onsemi.com 8 NCV890231GEVB Table 4. BILL OF MATERIALS Reference Value Part # Manufacturer Description Package NCV890231 ON Semiconductor Integrated circuit 3x3 DFN10 7447786004 Wurth Inductor WE-PD-XS DFW MBR440MFS ON Semiconductor Diode, Schottky, 1.5A, 40V SMB DBST BAS16HT1 ON Semiconductor Diode, Switching, 200mA, 75V SOD-323 4.7 mF Murata Capacitor, Ceramic, 50V, X7R 1210 U1 L1 CVIN1 4.7 mH CVIN2 1 mF Murata Capacitor, Ceramic, 50V, X5R 0805 CDRV, CBST 0.1 mF Kemet Capacitor, Ceramic, 10V, X7R 0603 ZFB1 4.7 nF Murata Capacitor, Ceramic, 50V, X7R 0603 COUT1, COUT2 10 mF Murata Capacitor, Ceramic, 10V, X7R 1206 CCOMP 330 pF Murata Capacitor, Ceramic, 50V, C0G 0603 RCOMP 12.4 KW Vishay Resistor, 1% 0603 RFB1 100 W Vishay Resistor, 1% 0603 RFB2 31.6 W Vishay Resistor, 1% 0603 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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