DEMO MANUAL DC2117A LTC3895EFE High Input Voltage Synchronous Buck Converter Description Demonstration circuit 2117A is a single output high voltage nonisolated synchronous step-down converter that drives all N-channel MOSFET power stage. It features the LTC3895EFE, a high voltage step-down DC/DC controller housed in a TSSOP-38 package with several pins removed for high voltage spacing. N-channel MOSFET gate drivers can be adjusted from 5V to 10V to enable the use of logic- or standard-level MOSFETs to maximize efficiency. The EXTVCC pin permits the LTC3895 to be powered from the output of the switching regulator or other available source, reducing power dissipation and improving efficiency. This DC2117A operates over an input voltage range from 14V to 130V, while the LTC®3895 can operate up to 150V. This demo board produces a 12V output voltage with up to a 5A output current, and is configured with a sense resistor for over current protection and has optional DCR sensing. A mode selector allows the DC2117A to operate in forced continuous operation, pulse-skipping or low ripple Burst Mode® operation during light loads. Additional features include a power good output signal, a PLLIN, PHASEMD and CLKOUT for multiphase operation. To prevent high on-chip power dissipation in high input voltage applications, the LTC3895 includes an NDRV pin which drives the gate of an optional external N-channel MOSFET acting as a low dropout linear regulator to supply IC power and is an option on this board. The LTC3895 data sheet gives a complete description of the part, operation and application information and must be read in conjunction with this demo board manual. An internal charge pump allows for 100% duty cycle operation in dropout, a useful feature when powered from a battery during discharge. The LTC3895’s powerful 1Ω Performance Summary Design files for this circuit board are available at http://www.linear.com/demo/DC2117A L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C Table 1. PARAMETER CONDITIONS UNITS Input Voltage Range DC Up to 150VPK Transient 14V ~ 130V Output Voltage VOUT VIN = 14~130V, IOUT = 0~5A, JP4: FCM 12V ± 2% (11.76V ~ 12.24V) Maximum Output Current IOUT(MAX) VIN = 14~130V 5A Default Operating Frequency (Typical) 150kHz External Clock Sync Frequency Range 75kHz to 850kHz Typical Full Load Efficiency (See Figure 4) VIN = 48V, VOUT = 12V, IOUT = 5A, fSW = 150kHz 94.9% *Important Note: 60V or higher voltage can result in an electric shock if care is not taken. Also, hot plugging the circuit to a power supply that has more than 40V present at its output can produce a high voltage transient exceeding the absolute maximum input voltage which can damage the DC2117A board. dc2117af 1 DEMO MANUAL DC2117A Quick Start Procedure Demonstration circuit DC2117A is easy to set up to evaluate the performance of the LTC3895EFE. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals or directly across relevant capacitor. See Figure 2 for proper scope probe technique. 1.Place jumpers in the following positions: JP1ON JP4FCM JP5ON 2.With power off, connect the input power supply to VIN and GND. 3.Turn on the power at the input. NOTE. Make sure that the input voltage is higher than 14V and does not exceed 130V. 4.Check the output voltage. The output voltage should be between 11.76V and 12.24V. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency and other parameters. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high. JP8OFF Figure 1. Proper Measurement Equipment Setup dc2117af 2 DEMO MANUAL DC2117A Quick Start Procedure + – COUT VOUT GND Figure 2. Measuring Input or Output Ripple Across Terminals or Directly Across Ceramic Capacitor Frequency Synchronization and Mode Selection Demonstration circuit 2117A’s mode selector allows the converter to run in forced continuous operation, pulseskipping operation, Burst Mode operation or Burst Mode operation with adjustable clamp level by changing the position of JP4. To synchronize the DC2117A to an external clock, apply the sync signal to the PLLIN turret. Depending upon the JP4 setting, the DC2117A will operate in different modes. See Table 2 for the detailed description. Table 2. Mode Selection and Synchronized Operation Options CONFIGURATION JP4 MODE WITH SYNC SIGNAL SUPPLIED TO PLLIN Forced Continuous Operation FCM FCM PS PS BURST ADJ FCM BURST DEFAULT FCM Pulse-Skipping Operation Burst Mode Operation with Adjustable Clamp Level Burst Mode Operation with Default Clamp 100% Duty Demonstration circuit 2117A features 100% duty cycle operation in dropout. Set the JP5 to ON position to activate this feature. Set JP5 to OFF position disables the internal charge pump and enables boost refresh, allowing for 99% duty cycle operation in dropout. dc2117af 3 DEMO MANUAL DC2117A Optional Inductor DCR Current Sensing Demonstration circuit 2117A provides an optional circuit for inductor DCR current sensing. Inductor DCR current sensing uses the DCR of the inductor to sense the inductor current instead of discrete sense resistors. The advantages of DCR sensing are lower cost, reduced board space and higher efficiency, but the disadvantage is a less accurate current limit. If DCR sensing is used, be sure to select an inductor current with a sufficiently high saturation current or use an iron powder type material. Refer to Table 3 for optional inductor DCR current sensing setup and to the data sheet for more details. Table 3. Optional Inductor DCR Current Sensing CONFIGURATION RS1 R24 R28 C16 R37 R38 R39 R40 Current Sense Resistor (Default) Ref Sch Ref Sch Ref Sch OPEN OPEN OPEN OPEN OPEN 0Ω Copper OPEN OPEN 0Ω 0Ω Inductor DCR Current Sensing Calculated Value from Data Sheet Low Quiescent Current Applications and Measurement The typical quiescent current (IQ) of the LTC3895 controller is 40µA in sleep mode as specified in the LTC3895 data sheet. However, the input current of the DC2117A board can be higher than this value because of additional circuit outside of the IC. To reduce the total input current, large value FB divider resistors should be used. In addition, some jumpers and resistors should be configured accordingly. Refer to Table 4 for the low input quiescent current setup. Table 4. Low Input Quiescent Current Configuration Reference Designator R1 Function Stuffing Option R2 OVLO OPEN 0Ω R23 JP3 JP4 JP5 JP8 PGOOD INTVCC Jumper MODE Selector 100% DUTY BIAS Supply OPEN OPEN BURST ADJ or BURST DEFAULT OFF OFF dc2117af 4 DEMO MANUAL DC2117A EXTVCC Bias Supply By default, the DC2117A EXTVCC turret is tied to the 12V VOUT to save IC power loss. Alternatively, EXTVCC can also be powered by an external power supply: To power the EXTVCC from onboard bias supply: 1. Leave the JP7 OPEN. 1. Leave the JP7 OPEN. This step disconnects the EXTVCC from VOUT. 2. Keep the JP8 at the OFF position. 3. Apply a DC voltage (<14V) between the EXTVCC and GND turret, after the input voltage is established. Ensure that EXTVCC ≤ VIN. 2. Keep the JP8 at the ON position. The onboard BIAS supply output voltage is 12V. 100 95 90 EFFICIENCY (%) 85 80 75 70 65 60 VIN = 48V 55 VIN = 130V 50 VIN = 72V 0 0.5 1 1.5 2 3 2.5 IOUT (A) 3.5 4 4.5 5 DC2117a F03 Figure 3. DC2117A VOUT Typical Efficiency vs Load Current dc2117af 5 DEMO MANUAL DC2117A EXTVCC Bias Supply 20MHz BW VOUT 100mV/DIV 200µs/DIV DC2117a F04 Figure 4. DC2117A VOUT 1.25A ~ 2.5A Load Transient at VIN = 48V 20MHz BW VOUT 100mV/DIV 200µs/DIV DC2117a F05 Figure 5. DC2117A VOUT 1.25A ~ 2.5A Load Transient at VIN = 130V dc2117af 6 DEMO MANUAL DC2117A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CIN1 CAP, 100µF 20% 200V ELEC NIC NRB-XS101M200V16x20TBF 2 5 CIN2, CIN3, CIN4, CIN5, C14 CAP, 1812 0.47µF 10% 200V X7R MURATA GRM43DR72E474KW01L 3 2 CIN6, CIN7 CAP, 1210 0.1µF 10% 200V X7R MURATA GRM32DR72D104KW01L 4 1 COUT1 CAP, 1210 22µF 10% 16V X7R TDK C3225X7R1C226K 5 2 COUT2, COUT3 CAP, 7343 150µF 20% 16V AVX TPSD157M016R0125 6 3 C2, C4, C13 CAP, 0603 0.1µF 10% 25V X7R TDK C1608X7R1E104K 7 1 C3 CAP, 0603 1nF 10% 50V X7R AVX 06035C102KAT2A 8 1 C6 CAP, 0603 4700pF 10% 50V X7R AVX 06035C472KAT2A 9 1 C7 CAP, 0603 1µF 20% 16V X7R TDK C1608X7R1C105M 10 1 C9 CAP, 0603 10pF 10% 50V X7R AVX 06035C100KAT2A 11 1 C10 CAP, 0603 100pF 5% 50V NPO AVX 06035A101JAT2A 12 1 C11 CAP, 1206 0.033µF 20% 200V VISHAY VJ1206Y333MXCAC 13 1 C12 CAP, 0603 4.7µF 20% 16V X5R TDK C1608X5R1C475M080AC 14 1 C15 CAP, 1210 4.7µF 20% 16V X7R AVX 1210YC475KAT2A 15 1 L1 IND, 33µH 15% WURTH ELEKTRONIK 7443633300 16 1 L2 IND, 470µH COILCRAFT MSS1048T-474KLB 17 1 L3 IND, 1µH VISHAY IHLP-1616BZER1R0M11 18 3 Q2, Q3, Q4 XSTR, N-CHANNEL DMOS FET INFINEON BSC520N15NS3G 19 1 RS1 RES, 2512 0.006Ω 5% 1/4W VISHAY WSL25126L000FEA18 20 1 R1 RES, 0603 191kΩ 1% 1/10W VISHAY CRCW0603191KFKEA 21 1 R2 RES, 0603 1.74kΩ 1% 1/10W VISHAY CRCW06031K74FKEA 22 1 R6 RES, 0603 301kΩ 1% 0.1W VISHAY CRCW0603301KFKEA 23 8 R8, R10, R22, R24, R27, R28, R29, R35 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA 24 1 R9 RES, 0603 10MΩ 5% 1/10W VISHAY CRCW060310M0JNEA 25 1 R12 RES, 0603 2.2Ω 5% 1/10W VISHAY CRCW06032R20JNEA 26 1 R13 RES, 0603 10kΩ 1% 1/10W VISHAY CRCW060310K0FKEA 27 1 R14 RES, 0603 10kΩ 5% 1/10W VISHAY CRCW060310K0JNEA 28 1 R15 RES, 0603 140kΩ 1% 1/10W VISHAY CRCW0603140KFKEA 29 3 R16, R17, R23 RES, 0603 100kΩ 5% 1/10W VISHAY CRCW0603100KJNEA 30 1 R18 RES, 0603 49.9kΩ 1% 0.1W VISHAY CRCW060349K9FKEA 31 1 R25 RES, 0603 30.1kΩ 1% 1/10W VISHAY CRCW060330K1FKEA 32 1 R26 RES, 0603 80.6kΩ 1% 1/10W VISHAY CRCW060380K6FKEA 33 2 R30, R36 RES, 0603 10Ω 1% 1/10W VISHAY CRCW060310R0FKEA 34 1 R31 RES, 0603 2MΩ 1% 1/10W VISHAY CRCW06032M00FKEA 35 1 R32 RES, 0603 267kΩ 1% 1/10W VISHAY CRCW0603267KFKEA 36 1 R34 RES, 0603 196kΩ 1% 1/10W VISHAY CRCW0603196KFKEA 37 1 U1 IC, SYNCHRONOUS BUCK CONVERTER LINEAR TECH. LTC3895EFE 38 1 U2 IC, SYNCHRONOUS STEP DOWN REGULATOR LINEAR TECH LTC3639EMSE dc2117af 7 DEMO MANUAL DC2117A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components 1 0 CIN8 CAP, 1812 OPTION OPTION 2 0 COUT4 CAP, 7343 OPTION OPTION 3 0 C1, C5, C8, C16 CAP, 0603 OPTION OPTION 4 0 D1, D2 DIODE, OPTION OPTION 5 0 L1 - ALTERNATE IND, 33µH 15% WURTH ELEKTRONIK 7443643300 6 0 L4 IND, 22µH OPTION COILCRAFT SER2915H-223KL OPTION 7 0 Q1 XSTR, POWER OPTION 8 0 Q5 XSTR, NMOS OPTION OPTION 9 0 Q6, Q7 XSTR, OPTIMOS POWER - TRANSISTOR OPTION INFINEON IPD320N20N3 G OPTION 10 0 Q12, Q13 XSTR, OPTION OPTION 11 0 R3, R4, R5, R7, R11, R19, R20, R21, R37, R38, R39, R40 RES, 0603 OPTION OPTION 12 0 R33 RES, 1206 OPTION OPTION Hardware: For Demo Board Only 1 11 E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12 TURRET MILL-MAX 2501-2-00-80-00-00-07-0 2 3 JP1, JP5, JP8 HEADER, 3PIN, 2mm SULLINS NRPN031PAEN-RC 3 1 JP2 HEADER, 4PIN 2mm SULLINS NRPN041PAEN-RC 4 3 JP3, JP6, JP7 HEADER, 2PIN, 2mm SULLINS NRPN021PAEN-RC 5 1 JP4 HEADER, DOUBLE ROW 2X4 2mm SULLINS NRPN042PAEN-RC 6 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE 575-4 7 8 XJP1, XJP2, XJP3, XJP4, XJP5, XJP6, XJP7, XJP8 SHUNT, 2mm SAMTEC 2SN-BK-G 8 4 STANDOFF, SNAP ON KEYSTONE_8833 dc2117af 8 D C B A E3 E5 PGOOD PLLIN CLKOUT E11 E9 E8 INTVCC MODE SS 1 R16 100k R17 100k 100K R23 INTVCC R18 49.9k 1% JP3 R8 0 R6 301k 1% 0.1uF C4 7 JP4 8 6 4 3 5 2 1 MODE INTVCC OFF ON JP5 100% DUTY 3 2 1 2 10k R14 C8 OPT SENSE1- INTVCC BURST DEFAULT BURST ADJ. P.S. FCM R7 OPT SENSE1+ 140k 1% R15 C9 10pF VOSP OPT R5 C1 R25 30.1k 1% OPT R19 3 R26 80.6k 1% OPT R20 C10 100pF INTVCC OPT R2 1.74k 1% R27 0 OPT R21 C6 4700pF C3 1nF R13 10K 1% R3 OPT INTVCC VIN 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 R1 191k 1% DRVUV DRVSET FREQ NC GND PGOOD PLLIN GND CLKOUT CPUMP_EN GND MODE ITH VFB SS SENSE1- SENSE1+ VPRG OVLO LTC3895EFE U1 GND 39 4 TG SW BOOST BG DRVCC NDRV VIN EXTVCC RUN PHASMD ILIM INTVCC 20 21 22 24 26 28 30 32 BG TG R22 0 1 1 C11 0.033uF 200V JP6 1uF C7 EXTVCC 34 36 37 C2 0.1uF INTVCC 38 R4 R10 VIN C13 0.1uF D1 Q7 OPT Q6 OPT OPT 1 R12 2.2 0 INTVCC OPT 2 3 4 2 3 2 3 5 5 SW TG SW BG BG SW TG 4.7uF C12 Q1 OPT 4 3 2 1 JP2 Q2 4 3 2 1 4 R35 0 R33 OPT R31 2M 1% VIN OFF ON 4 Q5 OPT SENSE1+ JP8 R37 OPT 6 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 200V R24 0 11 5 12 14 3 R28 ISET FBO OVLO RUN VIN SCALE = NONE W _A `\ APPROVALS 1 4 3 200V 0.47uF CIN3 2SW 2512 LTC3639EMSE U2 0 R40 OPT 7 REV VFB SW 10 6 7 9 1 R29 0 VOUT VOUT J4 E10 C15 4.7uF 16V R30 10 1% GND VIN- EXTVCC E12 GND GND 12V, 5A J3 E7 E6 J2 14V - 130V VIN VIN LTC3895EFE DEMO CIRCUIT 2117A REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R34 196k R32 267k 1% EXTVCC D2 OPT COUT3 COUT4 + OPT + OPT 7343 7343 + CIN1 100uF 200V J1 RUN W_ W_ W_ APPROVED Tuesday, May 03, 2016 IC NO. 8 SHEET 1 OF 1 4 HIGH INPUT VOLTAGE SYNCHRONOUS BUCK CONVERTER 7 DATE: N/A SIZE MSS104BT L2 470uH COUT2 + 150uF 16V 7343 R36 10 1% VOSP L3 1.0uH TECHNOLOGY JP7 COUT1 22uF 16V 1210 VOUT 200V CIN8 OPT 200V VIN CIN5 0.47uF VIN E2 E4 03/30/16 PROD - Parts addition DATE 05/28/13 06/26/15 PROD 8 PROTO 200V TITLE: SCHEMATIC SS VPRG2 REVISION HISTORY DESCRIPTION 0.47uF CIN2 VPRG1 RS1 0.006 ECO 0.47uF CIN4 C16 OPT OPT R39 OPT R38 7443633300 L1 33uH 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. 3 2 VBIAS 1 C14 0.47uF 200V 1812 SENSE1- R11 OPT CIN6 0.1uF 200V 1210 R9 10M Q3 BSC520N15NS3G VIN OPT C5 CIN7 0.1uF 200V 1210 OFF ON Q4 BSC520N15NS3G JP1 RUN 6 CUSTOMER NOTICE SW 4 BSC520N15NS3G 90 180 120 PHASE MD INTVCC 5 1 2 3 5 1 2 3 5 1 2 3 5 1 2 3 3 GND 2 NC NC NC NC 2 4 13 15 GND GND 8 16 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. 17 1 D C B A DEMO MANUAL DC2117A Schematic Diagram dc2117af 9 DEMO MANUAL DC2117A 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 © 2004, Linear Technology Corporation dc2117af 10 Linear Technology Corporation LT 0616 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016