LM3754

LM3753/54 Evaluation Board LM3753/54 Evaluation Board National Semiconductor Application Note 2021 Robert Sheehan, Michael Null December 15, 2009 Introduction The LM3753/54 evaluation board is designed to provide the design engineer with a fully functional power converter based solution using two LM3753 or LM3754 2-Phase Buck Controllers. This evaluation board produces an output voltage of 1.2 V at 25A per phase for a total of 100A. The switching frequency for the converter is set to 300 kHz per phase, for an effective 1.2 MHz at the input and output. The gate signals for each controller’s outputs are 180 degree out of phase, with the two controllers having a 90 degree phase shift from each other. The printed circuit board consists of 4 layers of FR4 material with 2 ounce copper on all layers. This application note contains the evaluation board schematics, Bill-of-Materials (BOM) and a quick setup procedure. Refer to the LM3753/54 datasheet for complete circuit design information. The performance of the evaluation board is as follows: Input Range Output Voltage Output Current Switching Frequency Load Regulation Board Size : 6V to 18V : 1.2V ± 1% : 0A to 100A : 300 kHz : 0.1% : 4.2 x 5.4 x 0.063 inches QUICK SETUP PROCEDURE Step 1: Use an input power supply with at least 30A current capability. Connect the positive output of the power supply to the VIN terminal T1. Connect the negative output of the power supply to the input GND terminal T2. Step 2: Connect a load with 100A capability to the VOUT terminal T3 and GND terminal T4. Step 3: (LM3753 only) Connect a secondary power supply to the TRACK terminal TP13 and GND terminal TP2. Set the power supply voltage to 3.3V. Since the LM3753 is configured such that VOUT follows the TRACK input, VOUT cannot come up without applying a voltage to TRACK. Step 4: Ensure that the Load Pulse switch SW1 is in the center OFF position. Check that the current limit trimmers R18 and R26 are turned fully clockwise for maximum output current. J1, J3, J5 and J7 should be installed, with J2, J4, J6 and J8 open. Step 5: Set VIN to 12 V with no load being applied. Turn on the input power supply (followed by the secondary power supply for the LM3753 TRACK). The output voltage should be in regulation with a nominal value of 1.2V. Step 6: Slowly increase the load while monitoring the output voltage. The output voltage should remain in regulation up to the full load current of 100A. Step 7: Slowly vary the input voltage from 6V to 18V. The output voltage should remain in regulation with a nominal value of 1.2V. Powering and Loading Considerations Read this entire page prior to attempting to power the evaluation board. 30111201 FIGURE 1. Basic Test Setup for the LM3753/54 Evaluation Board AN-2021 © 2009 National Semiconductor Corporation 301112 www.national.com AN-2021 Board Configuration LM3753 TRACK The LM3753 evaluation board is configured such that VOUT follows the TRACK input. This configuration will not allow VOUT to come up without applying a voltage to TRACK. In order to produce 1.2V on the output, the TRACK pin must be connected to a secondary 3.3V power supply. To prevent current limit during startup, the rise time of the 3.3V TRACK signal should be longer than 100 μs. LM3754 SOFT-START The LM3754 evaluation board is configured such that VOUT follows the SS signal, which is set by C12 and an internal 10 μA current source. This allows the LM3754 to operate on its own, with a single power supply connected to VIN. OUTPUT VOLTAGE RIPPLE Output voltage ripple measurement should be taken directly across the output capacitor C66 between terminals TP3 and TP4. Care must 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 wrap a bare wire around the scope probe shaft. The bare wire should be in contact with the probe shaft since this is the 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 positive side of the capacitor. Figure 2 shows a diagram of this measurement technique. DCR and RESISTOR SENSE The LM3753/54 is delivered with the resistor sense option selected. To configure the board for DCR (Inductor DC Resistance) sensing, remove J1, J3, J5 and J7. Turn the current limit trimmers R18 and R26 fully counter-clockwise for the lower DC resistance. Short the power connections J2, J4, J6 and J8. Holes for the power jumpers will accommodate #14 AWG or 2 x #18 AWG solid copper wires. #2-56 hardware may also be used for the power connections. Due to the tight spacing, stagger the screws and nuts on the top and bottom; wrap #18 AWG solid copper wire around the hardware on the top side and tighten. Take care to avoid damaging adjacent components, particularly Q14-Q17 on the bottom side. Brass jumpers such as those used on terminal blocks should be avoided since the resistance is four times that of copper. LOAD PULSE GENERATOR An on-board load pulse generator allows for easy evaluation of the output voltage transient response. The LPI (Load Pulse In) and LPO (Load Pulse Out) terminals provide the interface to the load pulse generator. Setting SW1 to EXT connects LPI to LPO, which then allows the load pulse generator to be driven by LPI with an external 5V logic signal. Setting SW1 to INT allows the load pulse generator to be driven with an internally generated 1 ms pulse at 5% duty cycle. J9 selects the amount of load. With J9 open, Load Branch 1 is engaged to draw 1.2V / 0.05Ω = 24A. With J9 shorted, Load Branch 1 and Load Branch 2 are engaged to draw 1.2V / 0.025Ω = 48A. TP41 through TP44 provide monitoring of the load step. R59, C61 and the gate impedance of Q14-Q17 set the slew rate. With J9 open, R59 = 51Ω and C61 = 0.01 μF, the slew rate is 24A / 1 μs. With J9 open, R59 = 51Ω and C61 open, the slew rate is 24A / 200 ns. Results are shown in the Typical Performance Characteristics. OVER TEMPERATURE PROTECTION An LM26LV provides over temperature protection should the PC board exceed 105°C. This shuts down switching by pulling the /FAULT bus low. Normal operation resumes when the board cools below 100°C. A VTEMP terminal provides an analog voltage which is inversely proportional to temperature. Refer to the LM26LV datasheet for complete design information. VCC1, VCC2 and VDD The VCC and VDD terminals provide monitoring points for the on-board voltages. For the evaluation board, VDD is generated by an NPN linear regulator controlled by the LM3753/54. To demonstrate the maximum power stage efficiency, a 5V current limited external supply may be used for VDD. Extreme care must be exercised when applying an external voltage to the VDD terminal. Under no circumstances should a voltage be applied to VDD while VIN < 5V, as damage to the LM3753/54 will occur. To protect U1 and U2, the circuit may be modified by placing small Schottky diodes in series with R2 and R16 to block the reverse voltage. Refer to the LM3753/54 datasheet for complete circuit design information. ACTIVE LOADS Many constant-current types of active loads can exhibit an initial short circuit, which is sustained well beyond the normal soft-start cycle. To avoid current limit during startup, wait until the output voltage is up before turning on the load. Using an active load with a constant-resistance mode will avoid this startup timing issue. 2 30111202 FIGURE 2. Output Voltage Ripple Measurement Setup EXTERNAL CLOCK SYNCHRONIZATION A SYNCIN terminal has been provided on the evaluation board in order to synchronize the converter to an external clock or other fixed frequency signal from 225 kHz to 375 kHz. Refer to the LM3753/54 datasheet for complete information. POWER GOOD A PGOOD terminal provides monitoring of the Power Good signal. When PGOOD is high at VCC1, the output voltage is within the Power Good window. MARGIN A MARGIN terminal has been provided on the evaluation board in order to adjust the output voltage by ±5%. Shorting the MARGIN terminal to GND will adjust the output up 5%. Shorting the MARGIN terminal to VOUT will adjust the output down 5%. www.national.com AN-2021 Typical Performance Characteristics Efficiency with 5V External VDD and DCR Sense Efficiency with VDD Linear Regulator and Resistor Sense 30111203 30111204 Output Load Transient +24A / 1 μs Output Load Transient −24A / 1 μs 30111205 30111206 Output Load Transient +24A / 200 ns Output Load Transient −24A / 200 ns 30111207 30111208 3 www.national.com AN-2021 Startup from Enable Restart from Fault 30111209 30111210 Switching at 12V Input Output Voltage Ripple 30111211 30111212 Phase Matching VIAVE vs IOUT 30111213 30111214 www.national.com 4 Evaluation Board Schematic AN-2021 5 30111215 NT1, NT2 and NT3 are net ties for GND sensing. FIGURE 3. Evaluation Board Schematic — Master www.national.com AN-2021 www.national.com 30111216 6 FIGURE 4. Evaluation Board Schematic — Slave AN-2021 7 30111217 www.national.com FIGURE 5. Evaluation Board Schematic — Interface AN-2021 TABLE 1. Bill of Materials for LM3753 Evaluation Board Designator C1 C2, C15 C3, C10, C16, C18 C4 C5 C6 C7 Value 470uF 1uF 4.7uF 0.047uF 100pF 4700pF 2200pF Package SMT Radial G 0603 0805 0603 0603 0603 0603 0603 Description AL, 25V, 20%, 0.06 Ohm ESR Ceramic, X7R, 16V, 10% Ceramic, X7R, 16V, 10% Ceramic, X7R, 25V, 10% Ceramic, C0G/NP0, 50V, 5% Ceramic, X7R, 50V, 10% Ceramic, X7R, 50V, 10% Ceramic, X7R, 50V, 10% Manufacturer Panasonic TDK MuRata TDK TDK MuRata MuRata MuRata Part Number EEE-FP1E471AP C1608X7R1C105K GRM21BR71C475 KA73L C1608X7R1E473K C1608C0G1H101J GRM188R71H472 KA01D GRM188R71H222 KA01D GRM188R71H102 KA01D QTY 1 2 4 1 1 1 1 11 C8, C13, C14, C20, 1000pF C21, C55, C62, C63, C64, C65, C67 C9, C11, C17, C19, C59 C22, C23, C24, C25, C26, C27, C28, C29 C30, C31, C32, C33 C34, C35, C36, C37 C38, C39, C42, C43, C46, C47, C50, C51 C40, C41, C44, C45, C48, C49, C52, C53 C56, C68 C58 C60 C61 C66 D1, D2, D3, D4, D5, D6, D7, D8, D9 D14 H1, H2 H3, H4 H5, H6 H7, H8 H9, H10, H11, H12 H13, H14, H15, H16 J1, J3, J5, J7, J9 L1, L2, L3, L4 1x2 440nH 0.22uF 4.7uF 0603 1210 Ceramic, X7R, 25V, 10% Ceramic, X7R, 25V, 10% Taiyo Yuden Taiyo Yuden TMK107B7224KAT TMK325B7475KNT C1608C0G1H681J GRM188R71E154 KA01D GRM32ER71C226 KE18L EEF-SE0G221R 5 8 680pF 0.15uF 22uF 0603 0603 1210 Ceramic, C0G/NP0, 50V, 5% Ceramic, X7R, 25V, 10% Ceramic, X7R, 16V, 10% TDK MuRata MuRata 4 4 8 220uF UE SP, 4V, 20%, 0.005 Ohm ESR Panasonic 8 0.1uF 2.2uF 470pF 0.01uF 1uF 0.47V 1.25V 0603 0805 0603 0603 1206 SOD-323 SOD-123 Ceramic, X7R, 25V, 10% Ceramic, X7R, 16V, 10% Ceramic, X7R, 50V, 10% Ceramic, X7R, 50V, 10% Ceramic, X7R, 25V, 10% Vr = 40V, Io = 0.5A, Vf = 0.47V Vr = 100V, Io = 0.15A, Vf = 1.25V Mach Screw, Round, #10-32 x 3/8, Brass Mach Screw, Round, #1/4-20 x 1/2, Brass Lock Nut, #10-32, Stainless Steel Lock Nut, #1/4-20, Brass Machine Screw, Round, #4-40 x 1/4, Nylon Standoff Hex 0.5"L #4-40 Nylon Header, TH, 100mil, 1x2, Tin plated MuRata TDK MuRata TDK AVX Central Semiconductor Diodes Inc. GRM188R71E104 KA01D C2012X7R1C225K GRM188R71H471 KA01D C1608X7R1H103K 12063C105KAT2A CMDSH05-4 1N4148W-7-F 2EA13 2EA30 1EY35 1FA58 4DFG1 2 1 1 1 1 9 1 2 2 2 2 4 4 5 4 Keystone Samtec Inc. Pulse Engineering 1902C TSW-102-07-T-S PA0513.441NLT PA1513 Power Beads, 440nH, 0.32 mOhm www.national.com 8 AN-2021 Designator LED1, LED2 Value Green Package Power TOPLED w/lens Power TOPLED w/lens Description 0.114W, 3.8V Manufacturer OSRAM Part Number LT E63CBACB-35-L-Z LS E63F-DBFA-1Z 1-87230-2 5535512-3 CJD44H11 SiR850DP SiR892DP QTY 2 LED3 Red 0.1075W, 2.15V OSRAM 1 P1 P2 Q1 Q2, Q5, Q8, Q11 Q3, Q4, Q6, Q7, Q9, Q10, Q12, Q13, Q14, Q15, Q16, Q17 R1, R7, R8, R60, R61, R62, R80 R2, R16, R31, R32, R33, R34 R3, R55 R4, R5 R6, R35, R36, R37, R38, R51, R52, R53, R54, R58, R79 R9, R13 R10 R11 R12 R14 R15 R17, R25 R18, R26 R19, R27 R20, R21, R28 R22 R24, R30 R39, R42, R45, R48 NPN 25V 25V DPAK PowerPAK SO-8 PowerPAK SO-8 Header, 24-Pin, Right Angle Receptacle 24-Pin, Right Angle NPN, 8A, 80V 30A, 8.5nC, 7 mOHM 50A, 20 nC, 3 mOHM Tyco Electronics Tyco Electronics Central Semiconductor Vishay-Siliconix Vishay-Siliconix 1 1 1 4 12 10k 2.2 2.4k 1.0k 1.0 0603 0603 0603 0603 0603 5%, 0.1W 5%, 0.1W 5%, 0.1W 5%, 0.1W 5%, 0.1W Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale CRCW060310K0J NEA CRCW06032R20J NEA CRCW06032K40J NEA CRCW06031K00J NEA CRCW06031R00J NEA 7 6 2 2 11 3.01k 240 6.2k 30.1k 35.7k 10.0k 78.7k 200 191 4.02k 1.37k 0 5.90k 0603 0603 0603 0603 0603 0603 0603 TS53Y 0603 0603 0603 0603 0603 0.1%, 0.1W 5%, 0.1W 5%, 0.1W 1%, 0.1W 1%, 0.1W 1%, 0.1W 1%, 0.1W Pot 5mm Sq Cermet 1%, 0.1W 1%, 0.1W 1%, 0.1W 5%, 0.1W 1%, 0.1W Yageo America Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Sfernice Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale RT0603BRD073K 01L CRCW0603240RJ NEA CRCW06036K20J NEA CRCW060330K1F KEA CRCW060335K7F KEA CRCW060310K0F KEA CRCW060378K7F KEA TS53YL201 CRCW0603191RF KEA CRCW06034K02F KEA CRCW06031K37F KEA CRCW06030000Z 0EA CRCW06035K90F KEA 2 1 1 1 1 1 2 2 2 3 1 2 4 9 www.national.com AN-2021 Designator R40, R43, R46, R49 R41, R44, R47, R50 R56 R57 R59 R63, R64, R65, R66, R67, R68, R69, R70, R71, R72, R73, R74 R75, R76, R77, R78 R101 RT1, RT2, RT3, RT4 SH-J1, SH-J3, SHJ5, SH-J7, SH-J9 SW1 T1, T2 T3, T4 TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP38, TP39, TP40, TP41, TP42, TP43, TP44 TP15, TP16, TP18, TP19, TP20, TP21, TP22, TP24, TP25, TP26, TP27, TP28, TP29, TP30, TP32, TP34, TP36 TP17, TP23, TP31, TP33, TP35, TP37 U1, U2 U3 Value 10.5k 0.001 470k 12k 51 0.3 Package 0603 WSK2512 0603 0603 0603 2512 Description 1%, 0.1W 1%, 1W 5%, 0.1W 5%, 0.1W 5%, 0.1W 1%, 1W Manufacturer Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Panasonic Part Number CRCW060310K5F KEA WSK25121L000F EA CRCW0603470KJ NEA CRCW060312K0J NEA CRCW060351R0J NEA ERJ-1TRQFR30U QTY 4 4 1 1 1 12 1.00k 120 47k 1x2 0603 1%, 0.1W 5%, 0.25W Vishay-Dale Panasonic MuRata Amp NKK Panduit Panduit Keystone Electronics CRCW06031K00F KEA ERD-S2TJ121V NCP18WB473J03 RB 2-382811-1 G3T23AP-RO CB35-36-CY CB70-14-CY 1598-2 4 1 4 5 1 2 2 21 0603 Thermistor, 47K, 2%, B25/50 4050, 0.1W Shunt, 100mil, Tin plated, Black Switch, DPDT, 3 Position 50A 90A Triple Terminal 50A Lug Terminal 90A Lug Terminal, Turret, TH, Triple White Test Point, TH, Multipurpose, White Keystone Electronics 5012 17 Black LM3753 LM26LV 105°C LMC555 LM2722 2 SQA32A SDB06A Test Point, TH, Multipurpose, Black Multi-Phase Buck Controller 1.6V, LLP-6 Factory Preset Temperature Switch and Temperature Sensor CMOS Timer High-Speed 4.5A Synchronous MOSFET Driver Keystone Electronics National Semiconductor National Semiconductor National Semiconductor National Semiconductor 5011 LM3753SQ LM26LVCISD-105 6 2 1 U4 U5 MUA08A M08A LMC555CMM LM27222M 1 1 www.national.com 10 AN-2021 TABLE 2. Bill of Materials for LM3754 Evaluation Board Designator C1 C2, C15 C3, C10, C16, C18 C4 C5 C6 C7 Value 470uF 1uF 4.7uF 0.047uF 100pF 4700pF 2200pF Package SMT Radial G 0603 0805 0603 0603 0603 0603 0603 Description AL, 25V, 20%, 0.06 Ohm ESR Ceramic, X7R, 16V, 10% Ceramic, X7R, 16V, 10% Ceramic, X7R, 25V, 10% Ceramic, C0G/NP0, 50V, 5% Ceramic, X7R, 50V, 10% Ceramic, X7R, 50V, 10% Ceramic, X7R, 50V, 10% Manufacturer Panasonic TDK MuRata TDK TDK MuRata MuRata MuRata Part Number EEE-FP1E471AP C1608X7R1C105K GRM21BR71C475 KA73L C1608X7R1E473K C1608C0G1H101J GRM188R71H472 KA01D GRM188R71H222 KA01D GRM188R71H102 KA01D QTY 1 2 4 1 1 1 1 11 C8, C13, C14, C20, 1000pF C21, C55, C62, C63, C64, C65, C67 C9, C11, C17, C19, C59 C12, C56, C68 C22, C23, C24, C25, C26, C27, C28, C29 C30, C31, C32, C33 C34, C35, C36, C37 C38, C39, C42, C43, C46, C47, C50, C51 C40, C41, C44, C45, C48, C49, C52, C53 C58 C60 C61 C66 D1, D2, D3, D4, D5, D6, D7, D8, D9 D14 H1, H2 H3, H4 H5, H6 H7, H8 H9, H10, H11, H12 H13, H14, H15, H16 J1, J3, J5, J7, J9 L1, L2, L3, L4 1x2 440nH 0.22uF 0.1uF 4.7uF 0603 0603 1210 Ceramic, X7R, 25V, 10% Ceramic, X7R, 25V, 10% Ceramic, X7R, 25V, 10% Taiyo Yuden MuRata Taiyo Yuden TMK107B7224KAT GRM188R71E104 KA01D TMK325B7475KNT C1608C0G1H681J GRM188R71E154 KA01D GRM32ER71C226 KE18L EEF-SE0G221R 5 3 8 680pF 0.15uF 22uF 0603 0603 1210 Ceramic, C0G/NP0, 50V, 5% Ceramic, X7R, 25V, 10% Ceramic, X7R, 16V, 10% TDK MuRata MuRata 4 4 8 220uF UE SP, 4V, 20%, 0.005 Ohm ESR Panasonic 8 2.2uF 470pF 0.01uF 1uF 0.47V 1.25V 0805 0603 0603 1206 SOD-323 SOD-123 Ceramic, X7R, 16V, 10% Ceramic, X7R, 50V, 10% Ceramic, X7R, 50V, 10% Ceramic, X7R, 25V, 10% Vr = 40V, Io = 0.5A, Vf = 0.47V Vr = 100V, Io = 0.15A, Vf = 1.25V Mach Screw, Round, #10-32 x 3/8, Brass Mach Screw, Round, #1/4-20 x 1/2, Brass Lock Nut, #10-32, Stainless Steel Lock Nut, #1/4-20, Brass Machine Screw, Round, #4-40 x 1/4, Nylon Standoff Hex 0.5"L #4-40 Nylon Header, TH, 100mil, 1x2, Tin plated TDK MuRata TDK AVX Central Semiconductor Diodes Inc. C2012X7R1C225K GRM188R71H471 KA01D C1608X7R1H103K 12063C105KAT2A CMDSH05-4 1N4148W-7-F 2EA13 2EA30 1EY35 1FA58 4DFG1 1 1 1 1 9 1 2 2 2 2 4 4 5 4 Keystone Samtec Inc. Pulse Engineering 1902C TSW-102-07-T-S PA0513.441NLT PA1513 Power Beads, 440nH, 0.32 mOhm 11 www.national.com AN-2021 Designator LED1, LED2 Value Green Package Power TOPLED w/lens Power TOPLED w/lens Description 0.114W, 3.8V Manufacturer OSRAM Part Number LT E63CBACB-35-L-Z LS E63F-DBFA-1Z 1-87230-2 5535512-3 CJD44H11 SiR850DP SiR892DP QTY 2 LED3 Red 0.1075W, 2.15V OSRAM 1 P1 P2 Q1 Q2, Q5, Q8, Q11 Q3, Q4, Q6, Q7, Q9, Q10, Q12, Q13, Q14, Q15, Q16, Q17 R1, R7, R8, R60, R61, R62, R80 R2, R16, R31, R32, R33, R34 R3, R55 R4, R5 R6, R35, R36, R37, R38, R51, R52, R53, R54, R58, R79 R9, R13 R10 R11 R12 R17, R25 R18, R26 R19, R27 R20, R21, R28 R22 R24, R30 R39, R42, R45, R48 R40, R43, R46, R49 R41, R44, R47, R50 NPN 25V 25V DPAK PowerPAK SO-8 PowerPAK SO-8 Header, 24-Pin, Right Angle Receptacle 24-Pin, Right Angle NPN, 8A, 80V 30A, 8.5nC, 7 mOHM 50A, 20 nC, 3 mOHM Tyco Electronics Tyco Electronics Central Semiconductor Vishay-Siliconix Vishay-Siliconix 1 1 1 4 12 10k 2.2 2.4k 1.0k 1.0 0603 0603 0603 0603 0603 5%, 0.1W 5%, 0.1W 5%, 0.1W 5%, 0.1W 5%, 0.1W Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale CRCW060310K0J NEA CRCW06032R20J NEA CRCW06032K40J NEA CRCW06031K00J NEA CRCW06031R00J NEA 7 6 2 2 11 3.01k 240 6.2k 30.1k 78.7k 200 191 4.02k 1.37k 0 5.90k 10.5k 0.001 0603 0603 0603 0603 0603 TS53Y 0603 0603 0603 0603 0603 0603 WSK2512 0.1%, 0.1W 5%, 0.1W 5%, 0.1W 1%, 0.1W 1%, 0.1W Pot 5mm Sq Cermet 1%, 0.1W 1%, 0.1W 1%, 0.1W 5%, 0.1W 1%, 0.1W 1%, 0.1W 1%, 1W Yageo America Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Sfernice Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale RT0603BRD073K 01L CRCW0603240RJ NEA CRCW06036K20J NEA CRCW060330K1F KEA CRCW060378K7F KEA TS53YL201 CRCW0603191RF KEA CRCW06034K02F KEA CRCW06031K37F KEA CRCW06030000Z 0EA CRCW06035K90F KEA CRCW060310K5F KEA WSK25121L000F EA 2 1 1 1 2 2 2 3 1 2 4 4 4 www.national.com 12 AN-2021 Designator R56 R57 R59 R63, R64, R65, R66, R67, R68, R69, R70, R71, R72, R73, R74 R75, R76, R77, R78 R101 RT1, RT2, RT3, RT4 SH-J1, SH-J3, SHJ5, SH-J7, SH-J9 SW1 T1, T2 T3, T4 TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP14, TP38, TP39, TP40, TP41, TP42, TP43, TP44 TP15, TP16, TP18, TP19, TP20, TP21, TP22, TP24, TP25, TP26, TP27, TP28, TP29, TP30, TP32, TP34, TP36 TP17, TP23, TP31, TP33, TP35, TP37 U1, U2 U3 Value 470k 12k 51 0.3 Package 0603 0603 0603 2512 Description 5%, 0.1W 5%, 0.1W 5%, 0.1W 1%, 1W Manufacturer Vishay-Dale Vishay-Dale Vishay-Dale Panasonic Part Number CRCW0603470KJ NEA CRCW060312K0J NEA CRCW060351R0J NEA ERJ-1TRQFR30U QTY 1 1 1 12 1.00k 120 47k 1x2 0603 1%, 0.1W 5%, 0.25W Vishay-Dale Panasonic MuRata Amp NKK Panduit Panduit Keystone Electronics CRCW06031K00F KEA ERD-S2TJ121V NCP18WB473J03 RB 2-382811-1 G3T23AP-RO CB35-36-CY CB70-14-CY 1598-2 4 1 4 5 1 2 2 20 0603 Thermistor, 47K, 2%, B25/50 4050, 0.1W Shunt, 100mil, Tin plated, Black Switch, DPDT, 3 Position 50A 90A Triple Terminal 50A Lug Terminal 90A Lug Terminal, Turret, TH, Triple White Test Point, TH, Multipurpose, White Keystone Electronics 5012 17 Black LM3754 LM26LV 105°C LMC555 LM2722 2 SQA32A SDB06A Test Point, TH, Multipurpose, Black Multi-Phase Buck Controller 1.6V, LLP-6 Factory Preset Temperature Switch and Temperature Sensor CMOS Timer High-Speed 4.5A Synchronous MOSFET Driver Keystone Electronics National Semiconductor National Semiconductor National Semiconductor National Semiconductor 5011 LM3754SQ LM26LVCISD-105 6 2 1 U4 U5 MUA08A M08A LMC555CMM LM27222M 1 1 13 www.national.com AN-2021 www.national.com 30111218 PCB Layout 14 Top Layer Components and Overlay AN-2021 15 30111219 www.national.com Top Layer Copper AN-2021 www.national.com 30111220 16 Mid Layer 1 Copper AN-2021 17 30111221 www.national.com Mid Layer 2 Copper AN-2021 www.national.com 30111222 18 Bottom Layer Copper as Viewed From Top AN-2021 19 30111223 www.national.com Bottom Layer Components and Overlay as Viewed From Top LM3753/54 Evaluation Board 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