DEMO MANUAL DC2111A-A/B LTC3774EUHE 4-Phase High Current Step-Down Converter with Very Low DCR Inductor Description Demonstration circuit DC2111A features the LTC(R)3774 in a 4-phase, high output current step-down converter with sub-m DCR sensing. This high performance converter operates at a switching frequency of 400kHz over an input voltage range of 10V to 14V. The 5mm x 5mm DrMOS and 0.33H/0.325m inductor provide high efficiency while supplying 30A per phase. The board comes in two assembly types. The -A assembly provides a 1.2V/90A converter with N+1 MOSFET failure protection and the -B assembly provides a high efficiency 1.2V/120A converter. 1.2V/90A Converter with N+1 MOSFET Failure Protection The -A assembly is intended for high reliability applications which have a very low tolerance for down-time or which operate in rugged environments. Each phase of the 1.2V/90A converter is protected by its own LTC4226-1 hot swap circuit on the input and an LTC4352 ideal diode on its output. If an internal DrMOS MOSFET fails, then that phase will be isolated from the rest of the circuit and the converter will continue to operate with only a small perturbation on the output and will provide the full rated 90A load. Once a fault is detected, the PWM signal for that phase will be floated. This in turn will signal the DrMOS to pull its TG and BG signals low. Examples of the converter's response to MOSFET failures can be seen in Figure 2 and Figure 3. Further protection is provided by a dedicated 5V bias supply for each phase. If the 5V bias for a given phase is pulled down due to a DrMOS failure or other fault, the 5V bias for the other phases will not be affected. In case of an overvoltage event, an external overvoltage protection circuit will pull down the output. The LTC3774 does have its own crowbar type overvoltage protection, but the ideal diodes will prevent the bottom FETs from pulling down the output once an overvoltage is detected. The external OVP comparator will also provide overvoltage protection in case the voltage sense lines are shorted or reversed. For a 12V input, the -A assembly provides a full load efficiency of 89.3% and a peak efficiency of 90.6% which occurs around 50% load. 1.2V/120A High Efficiency Converter The -B assembly is a high efficiency 1.2V/120A 4-phase converter. Given that it does not have the MOSFET failure protection and redundancy of the -A assembly, it provides higher efficiency and more output current. For a 12V input it provides a full load efficiency of 90.6% and a peak efficiency of 93.1% which occurs at 55% load. More Features Both assembly types provide many features. These include: * Remote sensing * CLKIN and CLKOUT pins * PGOOD, RUN and TRACK/SS pins * Dynamic load circuit * Optional phase shedding circuit The LTC3774 data sheet provide a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide. Design files for this circuit board are available at http://www.linear.com/demo/DC2111A-A/-B L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. dc2111aabf 1 DEMO MANUAL DC2111A-A/-B Performance Summary Specifications are at TA = 25C Table 1. A Converter (TA = 25C, No Airflow) PARAMETER CONDITION Minimum Input Voltage VALUE 10V Maximum Input Voltage 14V Output Voltage VOUT IOUT = 0A to 90A, VIN = 10V to 14V 1.2V 1.5% IOUT(MAX) VIN = 10V to 14V 90A Nominal Switching Frequency Efficiency, See Figure 6 400kHz VOUT = 1.2V, IOUT = 90A, VIN = 12V 89.3% Typical CONDITION VALUE Table 2. B Converter (TA = 25C, No Airflow) PARAMETER Minimum Input Voltage 10V Maximum Input Voltage 14V Output Voltage VOUT IOUT = 0A to 120A, VIN = 10V to 14V 1.2V 1.5% IOUT(MAX) VIN = 10V to 14V 120A Nominal Switching Frequency Efficiency, See Figure 7 400kHz VOUT = 1.2V, IOUT = 120A, VIN = 12V 90.6% Typical dc2111aabf 2 DEMO MANUAL DC2111A-A/B Quick Start Procedure The evaluation setup for demonstration circuit 2111A is shown in Figure 1. To test the board, follow the procedure below: 1)With power off, connect the input supply, load and meters as shown in the setup drawings. Preset the load to 0A and VIN supply to be 0V. 2)Place the jumpers in the following positions: JP1 RUN ON JP2 MODE CCM JP5 IDEAL DIODE MODE DIODE A ONLY 3)Set the input voltage to 12V. 4)Check the output voltage. The output voltage should be within the regulation limits shown in the Performance Summary table. 5)Next, apply full load and re-measure VOUT. Check the output voltage again to make sure it is within the regulation limits. 6)Adjust the input voltage and load current to the desired levels within their limits and observe the regulation, output ripple, load step response, efficiency and other parameters. Note 1. To monitor the output voltage ripple, use the BNC connectors labeled VOUT. Note 3. For loads less than 5A, some low level noise may appear on the output of the -A assembly. This is due to the normal operation of the ideal diodes and the slight current sharing discrepancy between the phases. To avoid this, place the DIODE jumper in the REV I ALLOWED setting. This will allow reverse current to flow through the diodes for clean output voltage ripple. However, the output will not be protected from faults which short the switch node to ground. Dynamic Load Circuit (Optional) Demonstration circuit 2111A provides a simple dynamic load circuit consisting of a MOSFET and sense resistor. To use the circuit, follow the steps below: 1.Connect the output of the pulse generator between PULSE GEN and GND. 2. Connect the BNC labeled LOAD STEP to an oscilloscope. 3. Connect the BNC labeled VOUT to an oscilloscope. 4.Preset the amplitude of a pulse generator to 0V and the duty cycle to 5% or less. 5.With the converter running, slowly increase the amplitude of the pulse generator output to provide the desired load step pulse height. The scaling for the load step signal is 2mV/A. Note 2. Do not connect load between the VOS+ and VOS- turrets. This could damage the converter. Only apply load across the VOUT+ and VOUT- stud connectors on the edge of the board. dc2111aabf 3 DEMO MANUAL DC2111A-A/-B Quick Start Procedure + - VOUT A IOUT COUT3 + VOUT - V + V - dc2111aab F01 VIN IIN A + - VIN SUPPLY Figure 1. Proper Measurement Equipment Setup for DC2111A-A/-B dc2111aabf 4 DEMO MANUAL DC2111A-A/B Quick Start Procedure VOUT (AC) 50mV/DIV VIN4 10V/DIV HiZB4 5V/DIV PWM4 5V/DIV VSW1 10V/DIV VSW2 10V/DIV VSW3 10V/DIV VSW4 10V/DIV 50s/DIV dc2111aab F02 Figure 2. 1.2V/90A Converter with N+1 MOSFET Failure Protection. Top MOSFET of Phase 4 Shorted Drain to Source with Full Load on the Output and a 12V Input. The Output Continues to Regulate with Only a small Perturbation on the Output. VOUT (AC) 50mV/DIV VIN1 10V/DIV HiZB1 5V/DIV PWM1 5V/DIV VSW1 10V/DIV VSW2 10V/DIV VSW3 10V/DIV VSW4 10V/DIV 50s/DIV dc2111aab F03 Figure 3. 1.2V/90A Converter with N+1 MOSFET Failure Protection. Bottom MOSFET of Phase 1 Shorted Drain to Source with Full Load on the Output and a 12V input. The Output Continues to Regulate with Only a Small Perturbation on the Output. dc2111aabf 5 DEMO MANUAL DC2111A-A/-B Quick Start Procedure VOUT(AC) 100mV/DIV 90A LOAD STEP 20A/DIV 45A 50s/DIV dc2111aab F04 Figure 4. 45A to 90A Load Step Response of the 1.2V/90A Converter with N+1 MOSFET Failure Protection Circuit. VIN = 12V. VOUT(AC) 100mV/DIV 120A LOAD STEP 20A/DIV 60A 50s/DIV dc2111aab F05 Figure 5. 60A to 120A Load Step Response of the 1.2V/120A High Efficiency Converter. VIN = 12V. dc2111aabf 6 DEMO MANUAL DC2111A-A/B Quick Start Procedure 95 10VIN 12VIN 14VIN EFFICIENCY (%) 90 85 80 EACH PHASE: DrMOS = FDMF5820DC, BOOST R = 0 L = WURTH 744301033 (0.33H, 0.32m) HOT SWAP CIRCUIT: LTC4226-1 WITH FDMS86500DC IDEAL DIODES: LTC4352 WITH BSC010NE2LS DrMOS BIAS = 5.6V BIAS POWER INCLUDED IN EFFICIENCY MEASUREMENT 75 70 0 20 40 60 80 100 LOAD CURRENT (A) dc2111aab F06 Figure 6. Efficiency Curves for the 1.2V/90A Converter with N+1 MOSFET Failure Protection. No Airflow. 100 10VIN 12VIN 14VIN EFFICIENCY (%) 95 90 85 EACH PHASE: DrMOS = FDMF5820DC, BOOST R = 0 L = WURTH 744301033 (0.33H, 0.32m) DrMOS BIAS = 5.6V BIAS POWER INCLUDED IN EFFICIENCY MEASUREMENT 80 75 0 20 40 60 80 LOAD CURRENT (A) 100 120 140 dc2111aab F07 Figure 7. Efficiency Curves for the 1.2V/120A High Efficiency Converter. No Airflow. dc2111aabf 7 DEMO MANUAL DC2111A-A/-B Quick Start Procedure VOUT IDEAL DIODES INDUCTORS DrMOS HOT SWAP VIN PHASE 1 PHASE 2 PHASE 3 PHASE 4 dc2111aab F08 Figure 8. Thermal Image of the 1.2V/90A Converter with N+1 MOSFET Failure Protection. Measured with Full Load and an Input Voltage of 12V. TAMB = 21C. Hot Spot is the DrMOS of Phases 2 with a Rise Over Ambient of 50C. VOUT 0m JUMPERS INDUCTORS DrMOS 0m JUMPERS PHASE 1 VIN PHASE 2 PHASE 3 PHASE 4 dc2111aab F08 Figure 9. Thermal Image of the 1.2V/90A Converter with N+1 MOSFET Failure Protection. Measured with Full Load and an Input Voltage of 12V. TAMB = 21C. Hot Spot is the DrMOS of Phases 2 with a Rise Over Ambient of 50C. dc2111aabf 8 DEMO MANUAL DC2111A-A/B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 9 C1, C6, C18, C20, C27, C30, C41, C43, C66 CAP, 2.2F 10% 16V X5R 0603 MURATA, GRM188R61C225KE15D 2 1 C10 CAP, 4.7nF, 5%, 25V, X7R 0603 AVX, 06033C472JAT2A 3 4 C11, C24, C33, C45 CAP, 1F 20% 25V X5R 0603 AVX, 06033D105MAT2A 4 2 C15, C37 CAP, 4.7F 20% 10V X5R 0805 AVX, 0805ZD475MAT2A 5 2 C17, C39 CAP, 1F 20% 25V X5R 0603 AVX, 06033D105MAT2A 6 12 C2, C12, C13, C14, C16, C19, C28, C34, CAP, 0.22F 10% 25V X7R 0603 C35, C36, C38, C40 AVX, 06033C224KAT2A 7 4 C23, C25, C46, C47 CAP, 100pF 10% 25V NPO 0603 AVX, 06033A101KAT2A 8 1 C4 CAP, 47pF 5% 50V NPO 0603 AVX, 06035A470JAT2A 9 4 C5, C21, C29, C42 CAP, 0.1F 10% 25V X7R 0603 AVX, 06033C104KAT2A 10 1 C50 CAP, 10F 20% 6.3V X5R 0805 AVX, 08056D106MAT2A 11 1 C73 CAP, 0.1F 10% 25V X7R 0603 AVX, 06033C104KAT2A 12 2 C8, C32 CAP, 330pF 10% 25V NPO 0603 AVX, 06033A331KAT2A 13 1 C9 CAP, 0.01F 10% 25V X7R 0603 AVX, 06033C103KAT2A 14 8 CIN1, CIN2, CIN3, CIN4, CIN8, CIN9, CIN11, CIN12 CAP, 22F, 10%, 16V, X5R, 1210 MURATA, GRM32ER61C226KE20L 15 2 CIN5, CIN10 CAP, 22F 10% 16V X5R 1210 MURATA, GRM32ER61C226KE20L 16 2 CIN6, CIN7 CAP, 150F, 25%, 25V, ALUM CORPORATION, 25HVH150M 17 8 COUT1, COUT2, COUT9, COUT10, COUT11, COUT12, COUT19, COUT20 CAP, 100F 20% 6.3V X5R 1206 MURATA, GRM31CR60J107ME39L 18 12 COUT3, COUT4, COUT5, COUT6, COUT7, COUT8, COUT13, COUT14, COUT15, COUT16, COUT17, COUT18 CAP, 330F 20% 2.5V POSCAP 7343 PANASONIC, 2R5TPE330M9 19 9 D1, D2, D3, D4, D6, D8, D11, D13, D18 DIODE, 1N4448HWT SOD523 DIODES INC, 1N4448HWT-7 20 2 D5, D10 DIODE, CMHZ4701 SOD123 CENTRAL SEMI, CMHZ4701 21 2 D7, D12 DIODE, CMHZ4683 SOD123 CENTRAL SEMI, CMHZ4683 22 1 D9 DIODE, SMAJ17A SMA-DIODE DIODE INC, SMAJ17A-13-F 23 4 L1, L2, L3, L4 IND, 0.33H 20% WURTH ELEKTRONIK 744301033 24 4 Q1, Q2, Q5, Q6 MOSFET, BSC010NE2LS LFPAK INFINEON, BSC010NE2LS 25 4 Q3, Q4, Q7, Q8 MOSFET, FDMS86500DC POWER56 FAIRCHILD, FDMS86500DC 26 1 R1 RES, 100k 1% 1/10W 0603 VISHAY, CRCW0603100KFKEA 27 4 R12, R40, R61, R84 RES, 24.9k 1% 1/10W 0603 VISHAY, CRCW060324K9FKEA 28 10 R13, R42, R45, R62, R86, R91, R112, R180, R181, R182 RES, 0 JUMPER 0603 VISHAY, CRCW06030000Z0EA 29 1 R154 RES, 2k 5% 1/4W 1206 VISHAY, CRCW12062K00JNEA 30 1 R16 RES, 1.69k 1% 1/10W 0603 VISHAY, CRCW06031K69FKEA 31 4 R18, R29, R65, R72 RES, 4.64k 1% 1/10W 0603 VISHAY, CRCW06034K64FKEA 32 4 R183, R184, R185, R186 RES, 100 1% 1/16W 0603 VISHAY, CRCW0603100RFKEA 33 1 R187 RES, 100 1% 1/10W 0805 VISHAY, CRCW0805100RFKEA 34 1 R19 RES, 30.1k 1% 1/10W 0603 VISHAY, CRCW060330K1FKEA 35 1 R2 RES, 56.2k 1% 1/10W 0603 VISHAY, CRCW060356K2FKEA 36 4 R20, R27, R66, R73 RES, 931 1% 1/10W 0603 VISHAY, CRCW0603931RFKEA dc2111aabf 9 DEMO MANUAL DC2111A-A/-B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 37 2 R23, R69 RES, 37.4k 1% 1/10W 0603 VISHAY, CRCW060337K4FKEA 38 2 R24, R34 RES, 10 1% 1/10W 0603 VISHAY, CRCW060310R0FKEA 39 4 R3, R32, R56, R78 RES, 1 1% 1/10W 0603 VISHAY, CRCW06031R00FKEA 40 2 R30, R75 RES, 2.2 1% 1/10W 0603 VISHAY, CRCW06032R20FKEA 41 2 R37, R82 RES, 30.1k 1% 1/10W 0603 VISHAY, CRCW060330K1FKEA 42 2 R39, R83 RES, 2.4M 1% 1/10W 0603 VISHAY, CRCW06032M40FKEA 43 18 R4, R10, R15, R21, R28, R31, R33, R48, R50, R57, R63, R67, R68, R74, R76, R77, R93, R95 RES, 0 JUMPER 0603 VISHAY, CRCW06030000Z0EA 44 2 R41, R85 RES, 38.3k 1% 1/10W 0603 VISHAY, CRCW060338K3FKEA 45 2 R44, R88 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 46 18 R5, R6, R7, R9, R11, R17, R22, R35, R36, R46, R52, R58, R60, R79, R80, R89, R96, R104 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 47 1 R64 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 48 4 RS1, RS2, RS3, RS4 RES, 0.007, 1% 1W 2512 VISHAY, WSL25127L000FEA 49 4 U1, U4, U7, U10 MOSFET, DrMOS DC-DC 2MHz QFN-5X5-31 FAIRCHILD, FDMF5820DC 50 4 U2, U5, U8, U11 IC, LTC4352CDD DFN12DD LINEAR TECHNOLOGY, LTC4352CDD#PBF 51 2 U3, U9 IC, LTC3774EUHE UHE-5X6-36P+1 LINEAR TECHNOLOGY, LTC3774EUHE#PBF 52 2 U6, U12 IC, LTC4226CUD-1 QFN16UD-3X3 LINEAR TECHNOLOGY,LTC4226CUD-1#PBF Bias Supplies 1 1 C66 CAP, 2.2F 10% 16V X5R 0603 MURATA, GRM188R61C225KE15D 2 2 C52, C57 CAP, 1F 10% 25V X5R 0805 AVX, 08053D105KAT2A 3 4 C53, C54, C61, C64 CAP, 10F 20% 6.3V X5R 0805 AVX, 08056D106MAT2A 4 4 C55, C56, C62, C63 CAP, 0.01F 10% 25V NPO 0603 AVX, 06033C103KAT2A 5 4 R114, R115, R127, R128 RES, 0 JUMPER 0603 VISHAY, CRCW06030000Z0EA 6 4 R116, R117, R130, R131 RES, 1M 5% 1/16W 0603 VISHAY, CRCW06031M00JNEA 7 4 R122, R123, R133, R134 RES, 255k 1% 1/10W 0603 VISHAY, CRCW0603255KFKEA 8 4 R125, R126, R137, R138 RES, 73.2k 1% 1/10W 0603 VISHAY, CRCW060373K2FKEA 9 2 U15, U16 IC, LT3027EDD DFN10DD LINEAR TECHNOLOGY, LT3027EDD#PBF Overvoltage Comparator 1 1 R129 RES, 0 JUMPER 0603 VISHAY, CRCW06030000Z0EA 2 2 C58, C59 CAP, 1F 20% 25V X5R 0603 AVX, 06033D105MAT2A 3 1 U17 IC, LT6656BIS6-25 SOT6 LINEAR TECHNOLOGY, LT6656BIS6-2.5#PBF 4 1 R136 RES, 931k 1% 1/10W 0603 VISHAY, CRCW06039K31FKEA 5 1 R140 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 6 1 R132 RES, 1k 1% 1/10W 0603 VISHAY, CRCW06031K0FKEA 7 1 R135 RES, 100k 1% 1/10W 0603 VISHAY, CRCW0603100KFKEA 8 1 R178 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 9 1 C65 CAP, 1F 20% 25V X5R 0603 AVX, 06033D105MAT2A dc2111aabf 10 DEMO MANUAL DC2111A-A/B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 10 1 R147 RES, 11k 1% 1/10W 0603 VISHAY, CRCW060311K0FKEA 11 1 R149 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 12 1 R145 RES, 25.5k 1% 1/10W 0603 VISHAY, CRCW060325K5FKEA 13 1 R146 RES, 100k 1% 1/10W 0603 VISHAY, CRCW0603100KFKEA 14 2 R151, R152 RES, 1k 1% 1/10W 0603 VISHAY, CRCW06031K0FKEA 15 1 R150 RES, 100 1% 1/16W 0603 VISHAY, CRCW0603100RFKEA 16 1 Q11 MOSFET, BSC010NE2LS LFPAK INFINEON, BSC010NE2LS 17 1 Q12 TRANSISTOR, NPN, MMBT3904L SOT23 ON SEMI, MMBT3904LT1G 18 1 R148 RES, 0.1 1% 1W 2512 VISHAY, WSL2512R1000FEA 19 1 U14 IC, LTC6702IDC DFN8DC LINEAR TECHNOLOGY, LTC6702IDC#PBF Dynamic Load Circuit 1 1 Q10 MOSFET, FDB8832 TO263AB FAIRCHILD, FDB8832 2 1 R104 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 3 1 R109 RES, 0.002 1% 1W 2512 VISHAY, WSL25122L000FEA Additional Demo Board Circuit Components 1 0 C3 CAP, OPT 0805 OPT 2 1 C31 CAP, 1F 10% 25V X7R 0603 AVX, 06033C104KAT2A 3 0 C69, C74 CAP, OPT 1206 OPT 4 0 C7, C22, C26, C44, C48, C49, C51, C60, CAP, OPT 0603 C67, C68 OPT 5 0 C70 CAP, OPT 0402 OPT 6 0 C71 CAP, OPT 0805 OPT 7 0 C72 CAP, OPT 0603 OPT 8 0 CIN13 CAP, OPT 25V OSCON OPT 9 0 COUT21 TO COUT28 CAP, OPT POSCAP 7343 OPT 10 0 D14, D15, D16, D17 DIODE, OPT SOD523 OPT 11 0 D19, D20 DIODE, OPT SOD523 OPT 12 1 D21 DIODE, CMHZ4701 SOD123 CENTRAL SEMI, CMHZ4701 13 4 D22, D23, D24, D25 DIODE, 1N4448HWT SOD523 DIODES INC, 1N4448HWT-7 14 0 JP3 HEADER, OPT 3 PIN 0079 SINGLE OPT 15 0 L5 IND, OPT OPT 16 0 Q9 MOSFET, FDB8832 TO263AB OPT 17 1 R140 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA 18 0 R141, R142, R143, R144 RES, OPT 1206 OPT 19 0 R153, R174, R175 CAP, OPT 0603 OPT 20 0 R169, R170, R171, R172, R173 RES, OPT 0402 OPT 21 1 R176 RES, 75k 1% 1/10W 0603 VISHAY, CRCW060375K0FKEA 22 1 R177 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA dc2111aabf 11 DEMO MANUAL DC2111A-A/-B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 23 1 R179 RES, 2k 5% 1/4W 1206 VISHAY, CRCW12062K00JNEA 24 0 R47, R51, R54, R55, R90, R92, R97, R98 RES, OPT 2512 OPT 25 0 R8, R14, R25, R26, R38, R43, R49, R53, R59, R70, R71, R81, R87, R94, R99, R100, R101, R102, R103, R105, R106, R107, R108, R110, R111, R113, R118, R119, R120, R121, R139, R155, R156, R157, R158, R159, R160, R161, R162, R163, R164, R165, R166, R167, R168, R188, R189, R190, R191 RES, OPT 0603 OPT 26 0 RN1 NTC, OPT 0603 / 0805 OPT 27 0 U13 IC, OPT DFN8DC OPT 28 0 U18 IC, OPT SOT23-5 OPT 29 1 U20 IC, LT6703IDC-3 DFN3DC LINEAR TECHNOLOGY, LT6703IDC-3#PBF Hardware: For Demo Board Only 1 12 E1 TO E12 TESTPOINT, TURRET, 0.095" MILL MAX, 2501-2-00-80-00-00-07-0 2 1 JP1 HEADER, 3 PIN 0.079 SINGLE ROW WURTH ELEKTRONIK 62000311121 3 1 JP2 HEADER, 4 PIN 0.079 SINGLE ROW WURTH ELEKTRONIK 62000411121 4 2 XJP1, XJP2 SHUNT, 0.079" CENTER WURTH ELEKTRONIK 60800213421 5 8 J1, J2, J3, J4, J5, J6, J7, J8 STUD, TEST PIN PEM, KFH-032-10 6 16 J1, J2, J3, J4, J5, J6, J7, J8 (x2) NUT, BRASS PL # 10-32 ANY, #10-32M/S 7 8 J1, J2, J3, J4, J5, J6, J7, J8 RING, LUG # 10 KEYSTONE, 8205 8 8 J1, J2, J3, J4, J5, J6, J7, J8 WASHER, TIN, PLATED BRASS #10EXT BZ TN 9 2 J9, J10 CON, BNC, 5 PINS CONNEX, 112404 10 1 J11 HEADER, DBL ROW, RT ANGLE, 2X4, 8PIN MILL-MAX, 802-10-008-20-001000 11 1 J12 SOCKET, DBL ROW, RT ANGLE, 2X4, 8PIN MILL-MAX, 803-43-008-20-001000 12 4 MTGS AT 4 CORNERS STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON) 13 1 JP5 HEADER, 3 PIN 0.079 SINGLE ROW WURTH ELEKTRONIK, 62000311121 14 1 XJP5 SHUNT, 0.079" CENTER WURTH ELEKTRONIK 60800213421 dc2111aabf 12 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 1 2 3 4 ON VIN- VIN- E2 D9 SMAJ17A CLKOUTA INTVCCA VIN 2512 R55 0.000 2512 R54 0.000 -B VIN2 VIN1 HIGH EFFICIENCY CIN7 CIN6 + 150uF 25V VIN CLKINA TP17 R17 10K R26 OPT R25 OPT R22 10K R19 30.1K INTVCCA R37 2 D5 CIN5 22uF 25V 1210 R49 OPT R44 10K A 13 6 17 7 16 37.4K ON2 GND GND CLS 2512 RS1 0.007 ILIM2 VIN INTVCC CLKOUT MODE/PLLIN FREQ PHMODE U6 OPT OPT R43 C22 Q3 FDMS86500DC 2512 FTMR2 FAULT2 FAULT1 C26 Q4 FDMS86500DC TP4 HIZB1 R6 10K 56.2K R2 0 R153 U3 LTC3774EUHE D8 8 14 15 5 /FLT1 B -B RUN C3 OPT 0805 R15 0 VIN C23 100pF TP5 C25 100pF /FLT2 1N4448HWT FTMR1 OPT OPT R53 LTC4226CUD-1 RS2 0.007 D6 R7 10K R11 10K 1N4448HWT ITEMP ITH VOSVOSNS C17 1uF 36 35 34 33 32 31 30 29 ITH ITEMP ILIM1 C7 OPT C4 47pF C8 330pF VOS- D7 CMHZ4683 -A 2.2 R30 C15 4.7uF 10V 0805 ON1 R39 2.4M R41 38.3K CMHZ4701 1 R45 0 30.1K VOS+ FSW = 400kHz R23 ILIM D18 2K 1N4448HWT 1206 R154 VOSNS R16 1.69K C10 C9 0.01uF 4.7nF 1N4448HWT D4 INPUT HOT SWAP CIRCUITS R14 OPT TK/SS -A 1N4448HWT D3 1. ALL RESISTORS ARE IN OHMS, 0603. 2. ALL CAPACITORS ARE 0603. 4 3 2 0 R10 D2 1N4448HWT 1N4448HWT D1 NOTE: UNLESS OTHERWISE SPECIFIED E12 J8 J7 E11 E4 JP2 3 2 1 1 JP1 MODE 10V - 14V VIN+ VIN+ CLKINA CCM BM PS TRACK/SS OFF RUN VIN4 VIN3 VIN2 VIN1 26 100K 25 VOSNS1- E1 HIZB1 17 0 R31 37 11 12 13 14 15 16 R52 10K HIZB1 HIZB2 R46 10K VIN2 5VBIAS2 R50 0 R48 0 5VBIAS1 VIN1 RUN HIZB2 TK/SS GND SNSDC2+ SNS2- SNSAC2+ PGOOD2 PGOOD1 SNSAC1+ SNS1- SNSDC1+ 18 C31 0.1uF RUN R64 10K C14 0.22uF C16 0.22uF C13 0.22uF C12 0.22uF 15 14 13 12 34 33 11 * PGND PGND PGND PGND PGND VIN U1 FDMF5820DC C19 0.22uF R33 0 C18 2.2uF 16V 1 R32 U4 FDMF5820DC 24 25 26 27 35 28 29 30 SW SW SW GL GL PGND PVCC TMON EN/FAULT# 24 25 26 27 35 28 29 30 31 R35 10K 5VBIAS2 SW SW SW GL GL PGND PVCC TMON EN/FAULT# 31 R5 10K R8 OPT C20 2.2uF 16V R36 10K INTVCCA R38 OPT R29 4.64K 1% R18 4.64K 1% HIGH EFFICIENCY CONVERTER C TP1 VOUT1 120A 90A IOUT(MAX) 0.33uH WURTH EL. 744301033 L2 COUT9 COUT10 100uF 6.3V 1206 COUT2 COUT1 100uF 6.3V 1206 VOUT2 R28 0 R27 931 1% R40 24.9K R21 0 R20 931 1% TP6 0.33uH 744301033 WURTH EL. L1 R12 24.9K R9 10K INTVCCA C6 2.2uF 16V 5VBIAS1 N+1 MOSFET FAILURE PROTECTION 15 14 13 12 34 VIN VIN VIN PGND PGND PGND PGND PGND VIN VIN VIN VIN C1 2.2uF 16V 1 R3 -A: STUFFED ON -A ASSEMBLY ONLY -B: STUFFED ON -B ASSEMBLY ONLY OPT, OPTIONAL: NOT STUFFED -B -A CIN4 CIN3 22uF 25V 1210 33 11 10 9 R189 OPT SNSDC2+ SNSDC1+ R188 OPT CIN2 CIN1 22uF 25V 1210 10 9 C2 0.22uF R4 0 C 4 BOOT PGOOD 23 TK/SS1 VCC INTVCCA 1 19 GND 8 VIN SW 16 1 PWM R1 1 2 1 2 1 VCC1 2 SENSE1 28 ITEMP1 ITEMP2 4 OUT1 3 GATE1 GATE2 10 VCC2 12 SENSE2 11 27 ITH1 OUT2 24 VOSNS1+ VOSNS2+ 4 TK/SS2 5 HIZB2 6 VOSNS2- 3 22 PWMEN1 8 PWMEN2 7 20 PWM1 PWM2 21 RUN1 RUN2 9 ITH2 2 9 SW 17 GND 10 7 PHASE SW 17 VIN 5 NC SW 18 OV UV 4 3 OV UV 3 2 1 R183 100 FAULT STATUS 5 REV THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. D 6 5 R184 100 6 5 R180 0 SCALE = NONE MS LT + COUT5 COUT3 COUT4 330uF 2.5V VOUT __ ECO DATE: N/A SIZE VOS- VOS+ -B VOUT- VOUT- VOUT- VOUT+ 1.2V / * VOUT+ VOUT+ MS APPROVED DATE 01-18-17 E Wednesday, January 18, 2017 IC NO. SHEET 1 OF 3 3 4 PHASE HIGH CURRENT STEP-DOWN CONVERTER WITH VERY LOW DCR INDUCTOR REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only VOUT LTC3774EUHE DC2111A TECHNOLOGY 2512 VOUT2 R51 0.000 2512 VOUT1 R47 0.000 J6 J5 J4 J3 J2 J1 HIGH EFFICIENCY E5 R34 10 COUT6 COUT7 COUT8 330uF 2.5V VOS- + R24 10 E3 PRODUCTION VOS+ DESCRIPTION REVISION HISTORY 3 E REV TITLE: SCHEMATIC HIZB2 TP7 HIZB1 TP2 R112 0 APPROVALS FAULT STATUS 5 Q2 BSC010NE2LS REV C21 0.1uF CUSTOMER NOTICE C24 1uF 5VBIAS2 R42 0 5VBIAS2 U5 LTC4352CDD C11 1uF 5VBIAS1 R13 0 4 3 U2 LTC4352CDD 5VBIAS1 C5 0.1uF Q1 BSC010NE2LS 3 2 1 IDEAL ORING DIODES -A LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. D 10 B 21 8 6 PHASE 7 SW 16 32 AGND 21 SW 18 6 SW 20 SW 19 2 ZCD# 2 SW 19 5 NC 4 BOOT 32 AGND SW 20 3 AGND SW 22 SW 23 SW 1 PWM 3 AGND SW VCC SW 22 ZCD# SW 23 1 VIN VCC 2 CPO REV 7 10 VIN 2 VCC 7 4 11 CPO 1 12 SOURCE REV 8 4 11 9 GATE EP 13 OUT 8 OUT GND 12 SOURCE GND 9 GATE EP 13 A 1 2 3 4 DEMO MANUAL DC2111A-A/B Schematic Diagram dc2111aabf 13 DEMO MANUAL DC2111A-A/-B DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation dc2111aabf 14 Linear Technology Corporation LT 0217 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2017