NCV8852GEVB NCV8852 Evaluation Board User's Manual Description The NCV8852 evaluation board (NCV8852GEVB) provides a convenient way to evaluate and integrate a complete high-efficiency non-synchronous buck converter design. No additional components are required, other than dc supplies for the input voltage and enable pin. The board can also be connected to an external clock source to synchronize the switching frequency. The board is configured for a 5.0 V output with a 170 kHz switching frequency and a 3 A current limit, intended for applications requiring 2 A of current. Modifying the NCV8852 evaluation board for different output voltage, switching frequency, or current limit is straightforward, requiring minimal component changes. http://onsemi.com EVAL BOARD USER’S MANUAL Key Features • • • • • • • 5.0 V Output Voltage 170 kHz Switching Frequency 2.0 A Current Limit Wide Input Voltage of 6.0 V to 36 V Regulated through Load Dump Conditions External Clock Synchronization up to 500 kHz Automotive Grade Figure 1. NCV8852GEVB Board Picture © Semiconductor Components Industries, LLC, 2013 May, 2013 − Rev. 4 1 Publication Order Number: EVBUM2040/D NCV8852GEVB Table 1. DEMONSTRATION BOARD TERMINALS Pin Name Function VIN Positive dc input voltage VOUT Regulated dc output voltage GND Common dc return EN/SYNC Enable input and external clock synchronization input Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND) Value Units Dc supply voltage (VIN) -0.3 to 36 V Dc supply voltage (EN/SYNC) -0.3 to 6.0 V 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, 6.0 V ≤ VIN ≤ 36 V, VEN/SYNC = 5.0 V, 0 ≤ IOUT ≤ 2.0 A, unless otherwise specified) Conditions Characteristics Typical Value Units 5.0 V 2 % Regulation Output Voltage Voltage Accuracy Line Regulation IOUT = 1.0 A 0.04 % Load Regulation VIN = 13.2 V 0.12 % Switching Frequency 170 kHz Soft-start Time 2.0 ms 170 to 500 kHz Cycle−by−Cycle Current Limit 3.33 A Over Current Protection Threshold 5.0 A VIN decreasing 3.1 V TJ rising 170 °C Switching SYNC Frequency Range Current Limit Protections Input Undervoltage Lockout (UVLO) Thermal Shutdown http://onsemi.com 2 NCV8852GEVB VIN R1 U1 1 ROSC OPEN GND 2 EN/SYNC C5 6.8n EN/SYNC C OMP C6 470p R3 3 4 FB ROSC EN/SYNC ISNS C OMP R5 8.06k GDRV FB 8852 8.06k VIN GND R2 30m 8 7 6 C1 0.1uF C3225X7S1H106K C2 C3 10uF 10uF VIN ISNS GDRV GND NVTFS5116PL Q1 L1 VSW 5 C4 10uF GND VOUT 33 uH MSS1246T-333ML D1 MBRA340T3 R4 C8 VOUT C7 100 uF 0.1uF B45197A2107K409 GND 42.2k Figure 2. NCV8852GEVB Board Schematic Operational Guidelines 1. Connect a dc input voltage, within the 6.0 V to 36 V range, between VIN and GND 2. Connect a load between VOUT and GND 3. Connect a dc enable voltage, within the 2.0 V to 5.5 V range, between EN/SYNC and GND 4. Optionally, for external clock synchronization, connect a pulse source between EN/SYNC and GND. The high state level should be within the 2.0 to 5.5 V range, and the low state level within the 0.0 V to 0.8 V range, with a frequency within the 170 kHz to 500 kHz range. VIN IOUT ZOUT VEN VSYNC Figure 3. NCV8852GEVB Board Connections http://onsemi.com 3 NCV8852GEVB TYPICAL PERFORMANCE Efficiency 100% 90% Efficiency (%) 80% 70% 60% VIN = 6.0 V 50% VIN = 13.2 V 40% VIN = 36.0 V 30% 20% 10% 0 0.5 1 1.5 Output Current (A) Figure 4. Efficiency at 170 kHz for a 5.0 V output http://onsemi.com 4 2 NCV8852GEVB Regulation 0.2000% 0.1500% Line Regulation (%) 0.1000% 0.0500% Iout = 100 mA Iout = 500 mA 0.0000% 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 -0.0500% Iout = 1.0 A Iout = 2.0 A -0.1000% -0.1500% -0.2000% Input Voltage (V) Figure 5. Line Regulation for 170 kHz and a 5.0 V output 0.2000% 0.1500% Load Regulation (%) 0.1000% 0.0500% VIN = 6.0 V 0.0000% 0.001 0.01 0.1 1 -0.0500% -0.1000% -0.1500% -0.2000% Output Current (A) Figure 6. Load Regulation for 170 kHz and a 5.0 V output http://onsemi.com 5 10 VIN = 13.2 V VIN = 36.0 V 6 8.06k R3 C5 EN/SYNC EN/SYNC GND 6.8n R5 8.06k 4 C6 470p 2 1 3 FB ROSC COMP OPEN R1 8852 FB COMP http://onsemi.com ISNS VIN GND GDRV 42.2k R4 EN/SYNC ROSC U1 GDRV 5 GND 6 7 8 R2 30m ISNS D1 MBRA340T3 33 uH MSS1246T-333ML VOUT C3225X7S1H106K C3 C2 10uF 10uF NVTFS5116PL Q1 L1 VSW C1 0.1uF VIN VOUT GND VIN GND C8 C7 0.1uF 100 uF B45197A2107K409 C4 10uF NCV8852GEVB SCHEMATIC NCV8852GEVB PCB LAYOUT Figure 7. Top View Figure 8. Bottom View http://onsemi.com 7 NCV8852GEVB Table 4. BILL OF MATERIALS Reference Part # Manufacturer Description Package U1 Value NCV8852 ON Semiconductor Integrated circuit SOIC-8 Q1 NVTFS5116PL ON Semiconductor Power MOSFET, P-Channel WDFN8 D1 MBRA340T3G ON Semiconductor Diode, Schottky, 40 V, 3 A SMA MSS1246T-333ML Coilcraft SMT Power Inductor L1 33 mH R1 No pop R2 0.03 W WSL0805R0300FEA18 Vishay/Dale Resistor, 1% 0805 R3, R5 8.06 kW CRCW06038K06FKEA Vishay/Dale Resistor, 1% 0603 R4 42.2 kW CRCW060342K2FKEA Vishay/Dale Resistor, 1% 0603 C1 0.1 mF GCM188R71H104KA57D Murata Capacitor, 50 V, X7R 0603 C2, C3, C4 10 mF GRM32DF51H106ZA01L Murata Capacitor, 50 V, Y5V 1210 C5 6800 pF EMK107SD682JA-T Taiyo Yuden Capacitor, 16 V 0603 C6 470 pF 06033A471JAT2A AVX Capacitor, 25 V, NP0 0603 C7 100 mF B45197A2107K409 Kemet Capacitor, 10 V 2917 C8 0.1 C0603C104K8RACTU Kemet Capacitor, 10 V, X7R 0603 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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