LM3000 LM3000EVAL AN-1951 GRM31CR6E106KA12L EEF-UE0G221R GRM188R61E105KA12D - Datasheet Archive

 

Application Note 1951 Arief Hernadi July 1, 2009 Introduction QUICK SETUP PROCEDURE Step 1: Set the input power supply current

 

National Semiconductor Application Note 1951 Arief Hernadi July 1, 2009 Introduction QUICK SETUP PROCEDURE Step 1: Set the input power supply current limit to 10A. Turn off the input power supply. Connect the input power supply to VIN terminal. Make sure to connect power supply ground to each GND1 and GND2 terminals in order to provide a short path for input current to return to the power supply. The LM3000 LM3000 evaluation board is designed to provide design engineer with a fully functional power converter based solution using Dual Output Emulated Current Mode Controller in LM3000 LM3000. This evaluation board provides two output voltages of 3.3V and 1.2V. The 3.3V output is designed to handle a maximum current of 8A; whereas the 1.2V output has a maximum current capability of 15A. The switching frequency for the converter is set at 500 kHz. The gate signals for each output voltage will be 180 degree out of phase from each other. The printed circuit board consists of 4 layers of FR4 material with 2 ounce copper on top and bottom layer and 1 ounce copper for internal layers. This application note contains the evaluation board schematic, Bill-of-Materials (BOM) and a quick setup procedure. Refer to LM3000 LM3000 datasheet for complete circuit design information. The performance of the evaluation board is as follows: Input Range : 6V to 18V Output Voltage 1 (VO1) : 3.3V Output Current 1 : 0 to 8A Output Voltage 2 (VO2) : 1.2V Output Current 2 : 0 to 15A Switching Frequency : 500 kHz Load Regulation : 1% Board Size : 2.68 x 3.146 x 0.068 inches Step 2: Connect the load with an 8A capability on VO1 and 15A capability on VO2. Connect the positive terminal to VO1 and VO2 and negative terminal to GND1 and GND2. Step 3: Connect a secondary power supply to EN1 and EN2 terminals. Set the power supply voltage to 5V. The ground return for this power supply should be connected to GND terminal. Since the evaluation board is configured such that VOUT2 tracks VOUT1, therefore VOUT2 cannot be turned on without turning on VOUT1. Different configuration might be required in order to turn on VOUT2 independently. This will be discussed later in the Tracking section of this application notes. LM3000 LM3000 Evaluation Board LM3000 LM3000 Evaluation Board Step 4: Set VIN to 12V with no load being applied. Turn on the input power supply followed by the secondary power supply in order to power up the enable pins. The output voltage should be in regulation with a value of 3.3V on VO1 and 1.2V on VO2. Step 5: Slowly increase the load in each output into its maximum output current while monitoring the output voltages in each channel. The output voltages should also be in regulation at each respective maximum output current. Powering and Loading Considerations Step 6: Slowly vary the input voltages from 6V and 18.5V. Both output voltages should remain in regulation with a nominal value of 3.3V on VO1 and 1.2V on VO2. Read this entire page prior to attempting to power the evaluation board. FIGURE 1. Basic Test Setup for LM3000EVAL LM3000EVAL Board © 2009 National Semiconductor Corporation 300931 www.national.com AN-1951 AN-1951 30093101 AN-1951 AN-1951 Board Configuration EXTERNAL CLOCK SYNCHRONIZATION A SYNC terminal has been provided in this evaluation board in order to synchronize the converter to an external clock or other fixed frequency signal from 200 kHz to 1.5 MHz. Refer to LM3000 LM3000 datasheet for complete information. 30093103 FIGURE 3. Tracking with an External Ramp for 3.3V Output OUTPUT VOLTAGE RIPPLE Output voltage ripple measurement should be taken directly across the output capacitor C21 or C22. Care has to be taken to minimize the loop area between the scope probe tip and the ground lead in order to minimize noise in the measurement. This can be achieved by removing the probe's spring tip and ground lead and then wire a bare wire around scope probe shaft. The bare wire should be in contact with the probe shaft since this is the "new" ground lead for the probe. The measurement can be taken by connecting the bare wire onto the ground side of the capacitor and the probe tip onto the other side of the capacitor. Figure 2 shows a diagram of this measurement technique. 30093102 FIGURE 2. Synchronization at 3.3V Output CLKOUT A CLKOUT terminal provides an external clock signal 90 degrees out of phase with the main clock. This clock signal can be used to synchronize a second LM3000 LM3000. TRACKING LM3000 LM3000 evaluation board is configured such that VOUT2 tracks VOUT1, while VOUT1 voltage increases with a rate determined by the value of C17 which is the soft-start capacitor for VOUT1 (Condition 1). This configuration will not allow VOUT2 to be turned on independently without turning on VOUT1. In order to track VOUT1, TRK2 pin should be connected to a divider junction between R14 and R15 through R26. When both outputs are used to track an external source (Condition 2), then R25, R26, and R28 should be left open and a 10 resistor should be added into R24 and R27. If no tracking feature is required, both TRK1 and TRK2 should then be tied to VDD in order to soft-start each output voltage based on soft-start capacitor value (Condition 3). This can be done by keeping R24, R26, and R27 open while adding a 10 resistor onto R25 and R28. Please note that the slew rate of track signal should be lower than the soft-start slew rate which is set by soft-start capacitor value. The following are the summary of different tracking configuration on LM3000EVAL LM3000EVAL board: Condition R24 R25 R26 R27 Open 10 Open Open 10 Open 10 Open Open 2 Open 10 Open 10 Open FIGURE 4. Output Voltage Ripple Measurement Setup R28 1 30093104 3 www.national.com 10 2 AN-1951 AN-1951 Typical Performance Waveforms Efficiency of 3.3V Output at 500 kHz Efficiency of 1.2V Output at 500 kHz 30093105 30093106 Output Ripple Voltage for 3.3V Output at 8A Load Output Ripple Voltage for 1.2V Output at 15A Load 30093107 30093108 Output Load Transient from 0 to 6A for 3.3V Output Output Load Transient from 0 to 10A for 1.2V Output 30093109 30093110 3 www.national.com FIGURE 5. Evaluation Board Full Schematic 30093111 AN-1951 AN-1951 Evaluation Board Schematic www.national.com 4 ID Part Number Type Size Parameters Qty Vendor C1, C2, C3, C4 GRM31CR6E106KA12L GRM31CR6E106KA12L Capacitor, Ceramic 1206 10 µF, 25V, X5R, 10% 4 Murata 7343-43 Not Used 0 C6,C7, C8 EEF-UE0G221R EEF-UE0G221R Capacitor, Polymer 7343-43 220 µF, 4V, 12 m 3 Panasonic C9, C10, C11, C14 GRM188R61E105KA12D GRM188R61E105KA12D Capacitor, Ceramic 0603 1 µF, 25V, X5R, 10% 4 Murata C12, C13, C30, C31 GRM188R71E104KA01D GRM188R71E104KA01D Capacitor, Ceramic 0603 0.1 µF, 25V, X7R, 10% 4 Murata C15 VJ0603Y821KXXA VJ0603Y821KXXA Capacitor, Ceramic 0603 820 pF, 25V, X7R, 10% 1 Vishay C16 VJ0603Y272KXXA VJ0603Y272KXXA Capacitor, Ceramic 0603 2.7 nF, 25V, X7R, 10% 1 Vishay C17 06035C273KAT2A 06035C273KAT2A Capacitor, Ceramic 0603 0.027 µF, 50V, X7R, 10% 1 AVX C18 VJ0603Y183KXXA VJ0603Y183KXXA Capacitor, Ceramic 0603 18 nF, 25V, X7R, 10% 1 Vishay C5 C19 VJ0603A121JXAA VJ0603A121JXAA Capacitor, Ceramic 0603 120 pF, 50V, COG, 5% 1 Vishay C20, C21 GRM31CR60J226KE19L GRM31CR60J226KE19L Capacitor, Ceramic 1206 22 µF, 6.3V, X5R, 10% 2 Murata C22 VJ0603A120KXAA VJ0603A120KXAA Capacitor, Ceramic 0603 12 pF, 50V, COG, 5% 1 Vishay AVX C23 06031A270KAT2A 06031A270KAT2A Capacitor, Ceramic 0603 27 pF, 100V, COG, 10% 1 C24 06035C122KAT2A 06035C122KAT2A Capacitor, Electrolytic 0603 1200 pF, 50V, X7R, 10% 1 AVX C25,C26 GRM188R71C104KA01D GRM188R71C104KA01D Capacitor, Ceramic 0603 0.1 µF, 16V, X7R, 10% 2 Murata C27 06035A121JAT2A 06035A121JAT2A Capacitor, Ceramic 0603 120 pF, 50V, COG, 5% 1 AVX C28, C29 EEEFK1H151P EEEFK1H151P Capacitor, Aluminum 10x10.2 mm 150 µF, 50V, 670 mA 2 Panasonic C32, C33 06031A180KAT2A 06031A180KAT2A Capacitor, Ceramic 0603 18 pF, 100V, COG, 10% 2 AVX D1, D2 CMSH3-40M CMSH3-40M Diode, Schottky SMA 3A, 40V 2 Central Semiconducto r D3 CMPD1001A CMPD1001A Diode, Switching SOT-23 250 mA, 90V 1 Central Semiconducto r Dz1, Dz2 CMHZ4690 CMHZ4690 Diode, Zener SOD-123 5.6V, 500 mW 2 Central Semiconducto r L1 7443551280 Inductor 2.8 µH, 20A, 3.8 m 1 Wurth Elektronik L2 744318120 Inductor 1.2 µH, 22A, 1.79 m 1 Wurth Elektronik Q1, Q3 HAT2168H HAT2168H N-CH MOSFET LF-PAK 30A, 30V, 6 m 2 Renesas Technology Q2, Q4 RJK0330DPB RJK0330DPB N-CH MOSFET LF-PAK 45A, 30V, 2.1 m 2 Renesas Technology R1 CRCW060313k3FKEA Resistor 0603 13.3 k, 1% 1 Vishay R2 CRCW06032k94FKEA Resistor 0603 2.94 k, 1% 1 Vishay R3, R4 CRCW060322k6FKEA Resistor 0603 22.6 k, 1% 2 Vishay R5 CRCW06033R01FNEA CRCW06033R01FNEA Resistor 0603 3.01, 1% 1 Vishay R6 CRCW06032k67FKEA Resistor 0603 2.67 k, 1% 1 Vishay R7 CRCW06034k64FKEA Resistor 0603 4.64 k, 1% 1 Vishay R8 CRCW06034M99FKEA CRCW06034M99FKEA Resistor 0603 4.99 M, 1% 1 Vishay R9 CRCW060315k4FKEA Resistor 0603 15.4 k, 1% 1 Vishay R10 CRCW060314k3FKEA Resistor 0603 14.3 k, 1% 1 Vishay R11, R12 CRCW0603100kFKEA Resistor 0603 100 k, 1% 2 Vishay 5 www.national.com AN-1951 AN-1951 TABLE 1. Bill of Materials AN-1951 AN-1951 ID Part Number Type Size Parameters Qty Vendor R13 CRCW060342k2FKEA Resistor 0603 42.2 k, 1% 1 Vishay R14 CRCW060335k7FKEA Resistor 0603 35.7 k, 1% 1 Vishay R15 CRCW060310k0FKEA Resistor 0603 10 k, 1% 1 Vishay R16, R17 CRCW06030000Z0EA CRCW06030000Z0EA Resistor 0603 0 2 Vishay R18 CRCW060375k0FKEA Resistor 0603 75 k , 1% 1 Vishay R19, R21 CRCW06031k33FKEA Resistor 0603 1.33 k, 1% 2 Vishay R20 CRCW0603102kFKEA Resistor 0603 102 k, 1% 1 Vishay R22, R23 CRCW040210R0FKED CRCW040210R0FKED Resistor 0402 Vishay Resistor 0603 10, 1% Not Used 2 10, 1% 2 Vishay R24, R27, R28, R29, R30 R25, R26 CRC060310R0FKEA CRC060310R0FKEA Resistor 0603 U1 LM3000 LM3000 Controller 32 Lead LLP 1 NSC VIN, VO1, VO2, GND1, GND2 1514-2 Turret Terminal 0.090" diameter 5 Keystone CLKOUT, PGOOD2 , TRK2, EN2, GND 1573-2 Turret Terminal 0.072" diameter 5 Keystone GND, EN1, TRK1, PGOOD1 , SYNC 1573-2 Turret Terminal 0.072" diameter 5 Keystone www.national.com 6 AN-1951 AN-1951 PCB Layout 30093112 Top Overlay as Viewed from Top 7 www.national.com AN-1951 AN-1951 30093113 Top Layer as Viewed from Top www.national.com 8 AN-1951 AN-1951 30093114 Bottom Overlay as Viewed from Top 9 www.national.com AN-1951 AN-1951 30093115 Bottom Layer as Viewed from Top www.national.com 10 AN-1951 AN-1951 30093116 Internal Layer 1 as Viewed from Top 11 www.national.com AN-1951 AN-1951 30093117 Internal Layer 2 as Viewed from Top www.national.com 12 AN-1951 AN-1951 Notes 13 www.national.com LM3000 LM3000 Evaluation Board Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Solutions www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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