NCV890204GEVB NCV890204 Evaluation Board User'sManual Description The NCV890204 is a fixed-frequency, monolithic, Buck switching regulator intended for Automotive, battery-connected applications that must operate with up to a 36 V input supply. The regulator is suitable for systems with low noise and small form factor requirements often encountered in automotive driver information systems. The NCV890204 is capable of converting the typical 4.5 V to 18 V automotive input voltage range to outputs as low as 3.3 V at a constant switching frequency above the sensitive AM band, eliminating the need for costly filters and EMI countermeasures. A Reset pin signals when the output is in regulation, and a pin is provided to adjust the delay before the RSTB signal goes high. The NCV890204 also provides several protection features expected in Automotive power supply systems such as current limit, short circuit protection, and thermal shutdown. In addition, the high switching frequency produces low output voltage ripple even when using small inductor values and an all-ceramic output filter capacitor − forming a space-efficient switching regulator solution. http://onsemi.com EVAL BOARD USER’S MANUAL Key Features • • • • • • • • • • • • • • • • • • Internal N-channel Power Switch Low VIN Operation Down to 4.5 V High VIN Operation to 36 V Withstands Load Dump to 40 V 2 MHz Free-running Switching Frequency Adjustable Spread Spectrum Reset with Adjustable Delay Logic level Enable Input Can be Directly Tied to Battery 2.0 A (min) Cycle-by-Cycle Peak Current Limit Short Circuit Protection enhanced by Frequency Foldback ±1.75% Output Voltage Tolerance Output Voltage Adjustable Down to 0.8 V 1.4 Millisecond Internal Soft-Start Thermal Shutdown (TSD) Low Shutdown Current NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable Wettable Flanks DFN (Pin Edge Plating) These Devices are Pb-Free and are RoHS Compliant Typical Applications • Audio, Infotainment, Safety – Vision Systems, Instrumentation Figure 1. NCV890204 Evaluation Board © Semiconductor Components Industries, LLC, 2014 May, 2014 − Rev. 1 1 Publication Order Number: EVBUM2226/D NCV890204GEVB CDRV VIN VIN DBST SW L1 3V Reg CBST DFW DRV BST Oscillator RSTB PWM LOGIC ON OFF RSTB DELAY CDELAY + + − Reset Delay FB + − + GND COMP Clamp TSD + Soft−Start RESET COMP Voltages Monitors + − Enable VOUT EN RCOMP + CCOMP RMOD RDEPTH Spread Spectrum RDEPTH RMOD Figure 2. NCV890204 Block Diagram TYPICAL APPLICATION CDRV DBST NCV890204 L1 VOUT VIN 1 VIN SW 12 2 DRV BST 11 CIN CBST DFW RSTB 3 RSTB COUT RFB1 DELAY 10 CDELAY 4 GND FB 9 EN 5 EN COMP 8 RFB2 RCOMP 6 RDEPTH RMOD 7 CCOMP RDEPTH RMOD Figure 3. Typical Application http://onsemi.com 2 COUT NCV890204GEVB Table 1. EVALUATION BOARD TERMINALS Pin Name Function VIN Positive dc Input Voltage GND Common dc Return VOUT Positive dc Output Voltage EN RST3B Master Enable Input Reset with Adjustable Delay Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND) Rating Dc Supply Voltage (VIN, EN) Dc Supply Voltage (RSTB) Storage Temperature Range Value Unit −0.3 to 40 V −0.3 to 6 V −55 to +150 °C 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 CHARACTERSITICS Characteristic Conditions Typical Value Unit 5.0 V REGULATION Output Voltage (VOUT) Line Regulation (VOUT) IOUT = 1.0 A 0.1 % Load Regulation (VOUT) VIN = 13.2 V 0.1 % Switching Frequency 2.0 MHz Soft-start Time 1.4 ms EN = 5 V 3.25 A VIN Decreasing 3.4 V TJ Rising 170 °C SWITCHING CURRENT LIMIT Peak Current Limit (VOUT) PROTECTIONS Input Undervoltage Lockout (UVLO) Thermal Shutdown 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. http://onsemi.com 3 VIN http://onsemi.com 4 Figure 4. NCV890204GEVB Evaluation Board Schematic GND RDEP EN GND GND RSTB 4.7uH RSTB 10K 0603 RRDEP 10K 0603 RRSTB KLV1 CVIN2 1uF 0805 50V/X7R KLV1 is shorted with copper in the PCB layout. DEV_GND RDEP EN VOUT CVIN1 4.7uF 1210 50V/X7R VIN CFLT2 4.7uF 1210 50V/X7R 1 2 L2 6 5 4 3 2 1 COMP FB RMOD DEV_GND RDEPTH EN GND BST SW DELAY NCV890204 RESET DRV VIN NCV890204 GND Coilcraft XAL7030−472ME M_PD_IND CFLT1 4.7uF 1210 50V/X7R 13 VSUP COMP 8 RMOD FB 9 7 DLY BST SW 10 11 12 DRV FB 10K 0603 RMOD DEV_GND 0.47uF 0603 DLY L1 4.7uH CSNB OPEN 0603 10V/X7R CCOMP 330pF 0603 C0G / 50V ZFB1 4.7nF 0603 50V DFW NRVB440MFST1G MBR360MFS Coilcraft XAL4030−472ME XAL4030−472 COMP RCOMP 6.98k 0603 DBST BAS16HT1G BST CDLY DEV_GND CBST 0.1uF 0603 RRMOD SW CDRV 0.1uF 0603 10V/X7R RSNB OPEN 0603 RFB2 31.6 0603 RFB1 100 0603 COUT1 10uF 1206 X7R / 10V COUT2 10uF 1206 X7R / 10V VOUT 1206 OPEN RMIN1 1206 OPEN RMIN2 GND GND GND VOUT NCV890204GEVB NCV890204GEVB OPERATIONAL GUIDELINES 1. Connect a dc input voltage, within the 6.0 V to 36 V range, between VIN and GND. 2. Connect a dc enable voltage, within the 2.0 V to 36 V range, between EN and GND. This will power up the switcher. The VOUT signal should be 3.3 V. 3. Add a load to VOUT – up to 2.0 A. Figure 5. NCV890204 Board Connections ADDITIONAL GUIDELINES Output Voltage Selection Some common setups are listed below: The voltage output for the switcher is adjustable and can be set with a resistor divider. The FB reference for the switcher is 0.8 V. Desired Output (V) VREF (V) RUPPER (kW, 1%) RLOWER (kW, 1%) 1.2 0.8 5.11 10.0 1.5 0.8 8.87 10.0 1.8 0.8 12.7 10.0 2.5 0.8 21.5 10.0 3.3 0.8 31.6 10.0 5.0 0.8 52.3 10.0 VOUT RUPPER FB = 0.8 V Spread Spectrum In SMPS devices, switching translates to higher efficiency. Unfortunately, the switching leads to a much noisier EMI profile. We can greatly decrease some of the radiated emissions with some spread spectrum techniques. Spread spectrum is used to reduce the peak electromagnetic emissions of a switching regulator. RLOWER Use the following equation: R UPPER + R LOWER V OUT*V FB V FB http://onsemi.com 5 NCV890204GEVB Time Domain The modulation depth and modulation frequency are each set by an external resistor to GND. The modulation frequency can be set from 5 kHz up to 50 kHz using a resistor from the RMOD pin to GND. The modulation depth can be set from 3% up to 30% of the nominal switching frequency using a resistor from the RDEPTH pin to GND. Please see the curves below for typical values: Frequency Domain Unmodulated V 52 fc 3fc 5fc 7fc 9fc MODULATION FREQUENCY (kHz) t V t fc 3fc 5fc 7fc 9fc The spread spectrum used in the NCV890204 is an “up-spread” technique, meaning the switching frequency is spread upward from the 2.0 MHz base frequency. For example, a 5 % spread means that the switching frequency is swept (spread) from 2.0 MHz up to 2.1 MHz in a linear fashion – this is called the modulation depth. The rate at which this spread takes place is called the modulation frequency. For example, a 10 kHz modulation frequency means that the frequency is swept from 2.0 MHz to 2.1 MHz in 50 ms and then back down from 2.1 MHz to 2.0 MHz in 50 ms. 47 42 37 32 27 22 17 12 7 2 0 10 20 30 RMOD, (kW) 40 50 60 Figure 6. Modulation Frequency vs. RMOD Value MODULATION DEPTH (%FSW) 35 30 25 20 15 10 5 0 0 10 20 30 RDEPTH, (kW) 40 50 60 Figure 7. Modulation Depth vs. RDEPTH Value Spread spectrum is automatically turned off when there is a short to GND or an open circuit on either the RMOD pin or the RDEPTH pin. Please be sure that the ROSC pin is an open circuit when using spread spectrum. http://onsemi.com 6 NCV890204GEVB TYPICAL PERFORMANCE Efficiency NCV890204 Efficiency − 3.3 V 100% 90% 80% Efficiency 70% 60% 50% 40% 30% VIN = 6.0 V VIN = 13.2 V 20% VIN = 28.0 V 10% 0% 0 0.5 1 1.5 2 2.5 Output Current (A) Figure 8. Efficiency with a 3.3 V Output NCV890204 Efficiency − 5.0 V 100% 90% 80% Efficiency 70% 60% 50% 40% 30% VIN = 6.0 V VIN = 13.2 V 20% VIN = 28.0 V 10% 0% 0 0.5 1 1.5 Output Current (A) Figure 9. Efficiency with a 5.0 V Output http://onsemi.com 7 2 2.5 NCV890204GEVB Line Regulation NCV890204 − Line Regulation − 3.3 V Line Regulation (% of VOUT) 1.00% 0.50% 0.00% IOUT = 100 mA −0.50% IOUT = 500 mA IOUT = 1.0 A IOUT = 2.0 A −1.00% 0.00 5.00 10.00 15.00 20.00 25.00 30.00 Input Voltage (V) Figure 10. Line Regulation for a 3.3 V Output NCV890204 − Line Regulation − 5.0 V Line Regulation (% of VOUT) 1.00% 0.50% 0.00% IOUT = 100 mA −0.50% IOUT = 500 mA IOUT = 1.0 A IOUT = 2.0 A −1.00% 0.00 5.00 10.00 15.00 20.00 Input Voltage (V) Figure 11. Line Regulation for a 5.0 V Output http://onsemi.com 8 25.00 30.00 NCV890204GEVB Load Regulation NCV890204 − Load Regulation − 3.3 V 0.04% VIN = 6.0 V 0.02% Load Regulation (% of VOUT) VIN = 13.2 V 0.00% VIN = 28.0 V −0.02% −0.04% −0.06% −0.08% −0.10% −0.12% −0.14% 0 0.5 1 1.5 2 2.5 Output Current (A) Figure 12. Load Regulation with a 3.3 V Output NCV890204 − Load Regulation − 5.0 V 0.04% 0.02% VIN = 6.0 V VIN = 13.2 V Load Regulation (% of VOUT) 0.00% VIN = 28.0 V −0.02% −0.04% −0.06% −0.08% −0.10% −0.12% −0.14% −0.16% 0 0.5 1 1.5 Output Current (A) Figure 13. Load Regulation with a 5.0 V Output http://onsemi.com 9 2 2.5 Figure 14. Schematic http://onsemi.com 10 GND RDEP EN GND GND RSTB L2 4.7uH RSTB 10K 0603 RRDEP 10K 0603 KLV1 CVIN2 1uF 0805 50V/X7R KLV1 is shorted with copper in the PCB layout. DEV_GND RDEP EN VOUT RRSTB CVIN1 4.7uF 1210 50V/X7R VIN CFLT2 4.7uF 1210 50V/X7R 6 5 4 3 2 1 FB RMOD COMP DEV_GND RDEPTH EN GND BST SW DELAY NCV890204 RESET DRV VIN NCV890204 GND Coilcraft XAL7030−472ME M_PD_IND CFLT1 4.7uF 1210 50V/X7R 13 VSUP 1 2 VIN COMP 8 RMOD FB 9 7 DLY BST SW 10 11 12 DRV FB 10K 0603 RMOD DEV_GND 0.47uF 0603 DLY L1 4.7uH CSNB OPEN 0603 10V/X7R CCOMP 330pF 0603 C0G / 50V ZFB1 4.7nF 0603 50V DFW NRVB440MFST1G MBR360MFS Coilcraft XAL4030−472ME XAL4030−472 COMP RCOMP 6.98k 0603 DBST BST BAS16HT1G CDLY DEV_GND CBST 0.1uF 0603 RRMOD SW CDRV 0.1uF 0603 10V/X7R RSNB OPEN 0603 RFB2 31.6 0603 RFB1 100 0603 COUT1 10uF 1206 X7R / 10V COUT2 10uF 1206 X7R / 10V VOUT 1206 OPEN RMIN1 1206 OPEN RMIN2 GND GND GND VOUT NCV890204GEVB SCHEMATIC NCV890204GEVB PCB LAYOUT Figure 15. Top View Figure 16. Bottom View http://onsemi.com 11 NCV890204GEVB BILL OF MATERIALS Table 4. BILL OF MATERIALS Manufacturer Manufacturer’s Part Number Substitution Allowed Kemet C0603C104K8RACTU Yes 603 Murata Electronics North America GCM1885C1H331JA16D Yes 10% 603 Murata Electronics North America GCM188R71E474KA64D Yes 4.7 mF 10% 1210 Murata Electronics North America GRM32ER71H475KA88L Yes CAP CER 10 mF 10 V X7R 1206 10 mF 10% 1206 Murata Electronics North America GRM31CR71A106KA01L Yes 1 CAP CER 1.0 mF 50 V X5R 0805 1.0 mF 10% 805 Murata Electronics North America UMK212BJ105KG-T Yes DBST 1 DIODE SWITCH 200 mA 75 V SOD323 75 V/0.2 A N/A SOD_323 ON Semiconductor BAS16HT1G No DFW 1 DIODE SCHOTTKY 4.0 A 40 V SMB 40 V/4.0 A N/A SMB_DIODE ON Semiconductor NRVB440MFST1G No L1 1 INDUCTOR POWER 4.7 mH 4.5 A SMD 4.7 mH 4.5A XAL4030-472 Coilcraft XAL4030-472ME No L2* 1 RES 0.0 W 1/4 W JUMP 1206 SMD 0W 5% 1206 Yageo RC1206JR-070RL Yes RCOMP 1 RES 6.98 kW 1/10 W 1% 0603 SMD 6.98 kW 1% 603 Vishay/Dale CRCW06036K98FKEA Yes RFB1 1 RES 100 W 1/10 W 1% 0603 SMD 100 W 1% 603 Vishay/Dale CRCW0603100RFKEA Yes RFB2 1 RES 31.6 W 1/10 W 1% 0603 SMD 31.6 W 1% 603 Vishay/Dale CRCW060331R6FKEA Yes RRDEP, RRMOD, RRSTB 3 RES 10.0 kW OHM 1/10 W 1% 0603 SMD 10.0 kW 1% 603 Vishay/Dale CRCW060310K0FKEA Yes ZFB1 1 CAP CER 4700 pF 50 V 10% X7R 0603 4700 pF 10% 603 Murata Electronics North America GRM188R71H472KA01D Yes CSNB 1 Do Not Populate 603 Yes RMIN1, RMIN2 2 Do Not Populate 1206 Yes RSNB 1 Do Not Populate 603 Yes BST, COMP, DLY, FB, RDEP, RMOD, SW 7 CIRCUIT PIN PRNTD .020″D .425″L Do Not Populate N/A TPA Mill-Max Manufacturing Corp. 3128-2-00-15-00-00-08-0 Yes GND1, GND2, VIN, VOUT 4 CONN JACK BANANA UNINS PANEL MOU N/A N/A BANANA Emerson Network Power Connectivity Soultions 108-0740-001 Yes Reference Designator(s) Qty. Description Value Tolerance Footprint CBST, CDRV 2 CAP .10 mF 10 V CERAMIC X7R 0603 0.1 mF 10% 603 CCOMP 1 CAP CER 330 pF 50 V C0G 0603 330 pF 10% CDLY 1 CAP CER 0.47 mF 25 V 10% X7R 0603 0.47 mF CFLT1, CFLT2, CVIN1 3 CAP CER 4.7 mF 50 V 10% X7R 1210 COUT1, COUT2 2 CVIN2 http://onsemi.com 12 NCV890204GEVB Table 4. BILL OF MATERIALS (continued) Manufacturer’s Part Number Substitution Allowed Mill-Max Manufacturing Corp. 2501-2-00-44-00-00-07-0 Yes TP Vector Electronics K24C/M Yes 12PINDFN4x4p65 ON Semiconductor NCV890204MWR2G No Reference Designator(s) Qty. Description Value Tolerance Footprint Manufacturer GND3−GND6 4 TERM SOLDER TURRET .219″ .109″L N/A N/A TURRET EN, RSTB 2 PIN INBOARD .042″ HOLE 1000/PKG N/A N/A NCV890204 1 1.2 A 2 MHz Automotive Buck Switching Regulator NCV890204 N/A *L2 is a placeholder footprint for an optional input inductor filter component. Boards are shipped with a shorting jumper installed to complete the input path. NOTE: All devices are RoHS Compliant. 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