NCV898031SEPGEVB NCV898031 Automotive Grade High‐Frequency SEPIC Controller Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Description Key Features • • • • • • • This NCV898031 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. The output is rated 7 V/8.5 W with a 2 MHz switching frequency over the typical 6 V to 18 V automotive input voltage range. 7 V/1.22 A Output 2 MHz Switching Frequency Input Undervoltage Lockout Internal Soft-Start Wide Input Voltage of 6 V to 40 V Regulates through Load Dump Conditions Automotive Grade Figure 1. NCV898031 SEPIC Evaluation Board © Semiconductor Components Industries, LLC, 2014 January, 2014 − Rev. 2 1 Publication Order Number: EVBUM2167/D NCV898031SEPGEVB Table 1. EVALUATION BOARD TERMINALS Terminal Function VIN Positive DC Input Voltage GND Common DC Return VOUT Regulated DC Output Voltage EN Enable Input Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND) Value Unit DC Supply Voltage (VIN) −0.3 to 40 V DC Supply Voltage (EN) −0.3 to 6 V Junction Temperature −40 to 150 °C Ambient Temperature (Evaluation Board) −40 to 105 °C Rating Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 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) Condition Typical Value Unit Switching Frequency − 2 MHz Soft-Start Time − 650 ms − 4 A Input Undervoltage Lockout (UVLO) VIN Decreasing < 6 (Note 1) V Input Undervoltage Lockout (UVLO) VIN Increasing 6.7 V Thermal Shutdown TA Increasing 170 °C Characteristic Switching Current Limit Cycle-by-Cycle Current Limit (FET) Protections Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 1. NCV898031 IC UVLO is 3.05 V (VIN falling). The demo board current limit resistor was selected to limit power when VIN is reduced below 6 V. See Point 3 from Test Procedure. PCB LAYERS Figure 2. Top View Figure 3. Bottom View http://onsemi.com 2 NCV898031SEPGEVB TYPICAL PERFORMANCE Start-up Figure 4. Typical Start-up with VIN = 12 V, IOUT = 1.22 A Figure 5. Operational Waveforms, VIN = 12 V, RIOUT = 1.22 A http://onsemi.com 3 NCV898031SEPGEVB SCHEMATIC Figure 6. NCV898031 SEPIC Evaluation Board Schematic http://onsemi.com 4 NCV898031SEPGEVB Table 4. BILL OF MATERIALS Reference Designator(s) Quantity Description Footprint Manufacturer’s Part Number Vendor Part # C1, C11, C13 3 CAP CER 0.1 mF 50 V 10% X7R 0805 805 GRM21BR71H104KA01L 490-1666-1-ND C2 1 CAP ALUM 10 mF 50 V 20% RADIAL CAP_RAD_5X11 EKZE500ELL100ME07D 565-1702-ND C3 1 CAP CER 1 mF 16 V 10% X7R 0603 603 GCM188R71C105KA64D 490-5241-1-ND C4 1 CAP CER 6800PF 50 V 10% X7R 0603 603 GRM188R71H682KA01D 490-1508-1-ND C5 1 CAP CER 680PF 50 V 5% NP0 0603 603 GRM1885C1H681JA01D 490-1447-1-ND C6, C10 2 CAP CER 4.7 mF 50 V 10% X7R 1206 1206 C3216X7R1H475K 445-8032-1-ND C7 1 CAP CER 1 mF 50 V 10% X7R 1206 1206 GCM31MR71H105KA55L 490-4795-1-ND C8 1 CAP CER 100 pF 50 V 5% NP0 0603 603 GCM1885C1H101JA16D 490-4767-1-ND C9 1 CAP HYBRID CONDUCTIVE POLYMER 68 mF 10 V 20% SUNCON_6p6CAP 10HVA68M SUNCON C12 1 CAP CER 120 pF 50 V 5% NP0 0603 603 GRM1885C1H121JA01D 490-1429-1-ND D1 1 60 V, 3.0 A Schottky Rectifier SMC_DIODE NRVBS360T3G ON Semiconductor D2, D3 2 DIODE SCHOTTKY 40 V 1 A SOD123FL SOD_123 MBR140SFT1G ON Semiconductor L1, L2 2 High Temp SMT Power Inductor 15 mH 2.8 A XAL4040 XAL4040-153ME XAL4040-153ME Q1 1 N-CHANNEL MOSFET, LL, 60 V 11.5 mW WDFN8 NVTFS5820NL ON Semiconductor R1 1 RES 3.01 kW 1/10 W 1% 0603 SMD 603 CRCW06033K01FKEA 541-3.01KHCT-ND R2 1 RES 10.0 kW 1/10 W 1% 0603 SMD 603 CRCW060310K0FKEA 541-10.0KHCT-ND R3 1 RES 48.7 kW 1/10 W 1% 0603 SMD 603 CRCW060348K7FKEA 541-48.7KHCT-ND R4 1 RES 10.0 W 1/10 W 1% 0603 SMD 603 CRCW060310R0FKEA 541-10.0HCT-ND R5 1 RES 5.6 W 1/10 W 5% 0603 SMD 603 CRCW06035R60JNEA 541-5.6GCT-ND R6 1 RES 0.0 W 1/8 W 0805 SMD 805 CRCW08050000Z0EA 541-0.0ACT-ND R7 1 RES 1.00 kW 1/10 W 1% 0603 SMD 603 CRCW06031K00FKEA 541-1.00KHCT-ND R8, R10 2 RES .22 W 1/3 W 1% 0805 SMD 805 RL1220S-R22-F CSR1206FK25L0TR-ND R9 1 RES 23.7 W 1/10 W 1% 0603 SMD 603 CRCW060323R7FKEA 541-23.7HCT-ND TP1, TP3, TP4, TP7, TP8, TP14, TP15, TP16, TP17 9 PIN INBOARD .042″ HOLE 1000/PKG TP K24C/M V1055-ND TP2, TP5, TP6, TP9 4 CIRCUIT PIN PRNTD .020″D .425″L SMALLTP 3128-2-00-15-00-00-08-0 ED90324-ND TP10, TP11, TP12, TP13 4 TERM SOLDER TURRET .219″ .109″L TURRET 2501-2-00-44-00-00-07-0 2501-200440000070-ND U1 1 2 MHz Non-Synchronous SEPIC/Boost Controller SOIC8_N_ADJ NCV898031D1R2G ON Semiconductor http://onsemi.com 5 NCV898031SEPGEVB TEST PROCEDURE converter output and input voltages. The converter turns-on typically at 6.7 V (VIN rising). Once energized, the output voltage supplies power to the IC when the battery voltage is less than the IC VIN input voltage. The decreasing VIN UVLO voltage depends on load current as well as VIN, and will be less than 6 V when operating below rated output current. 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 7 V/1.22 A output power at a minimum input voltage of 6 V. The NCV898031 VIN has its operational voltage diode-ored between the 5.8 W − + VIN + VEnable − Figure 7. Evaluation Board Connections 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. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. 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