DEMO MANUAL DC1687B LTC3115-1 40V, 2A Synchronous Buck-Boost DC/DC Converter DESCRIPTION Demonstration circuit 1687B features the LTC(R)3115-1, a high voltage monolithic synchronous buck-boost converter. The DC1687B demo board has two user-selectable operating modes: Burst Mode(R) operation and forced continuous operation (fixed frequency PWM) (JP1). There is also an accurate programmable RUN pin which is used to enable the converter (JP2). The DC1687B operates with a 2.7V to 40V input voltage range. The demo board has been designed with the output voltage set to 5V. The LTC3115-1 incorporates a proprietary low noise switching algorithm which optimizes efficiency with input voltages above, below or equal to the output voltage and ensures seamless transitions between operating modes. The demo board also has optional provisions to back feed VCC in order to increase efficiency in some 5V output applications. There is also a provision for an optional Schottky diode from SW2 to VOUT for applications where VOUT is greater than 20V and short circuit protection is desired. Consult the data sheet for more information on these options. Figures 1 and 2 show typical demo board efficiency. The LTC3115-1 data sheet has detailed information about the operation, specifications, and applications of the part. The data sheet should be read in conjunction with this quick start guide. Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. The demo board has been programmed to operate at 1MHz in PWM mode to optimize small size with high efficiency operation. PERFORMANCE SUMMARY PARAMETER VALUE Input Voltage Range 2.7V to 40V VOUT 5.0V IOUT (See Note 1) 1A For VIN 3.6V, 2A For VIN > 6V Efficiency See Figures 1 and 2 Note 1: The Demo Board output current is a function of VIN. Please refer to the data sheet for more information Note: This manual is intended to be used with an updated version of the demo board titled, "Demo Circuit 1687B." See Figure3. Rev. 0 1 DEMO MANUAL DC1687B QUICK START PROCEDURE Using short twisted pair leads for any power connections and with all loads and power supplies off, refer to Figure3 for the proper measurement and equipment setup. The battery/power supply (PS1) should not be connected to the circuit until told to do so in the procedure below. 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 (see Figure4), or by using an oscilloscope probe tip jack. 1.Jumper and PS1 settings to start: PS1 = OFF JP1 (PWM) = fixed frequency JP2 (RUN) = ON 4.Turn on PS1 and slowly increase voltage until the voltage at VIN is 4.0V. 5.Verify VOUT is ~5.0V. 6.VIN can now be varied between 2.7V and 40V. IOUT may need to be reduced for VIN < 4V. VOUT should remain in regulation. 7.Load current (IOUT) can also be varied. The maximum IOUT is a function of VIN and the current limit. Consult the data sheet for more information on IOUT vs VIN. In general for VIN > 3.6V IOUT can be increased to 1A. For VIN > 6V IOUT can be increased to 2A. 8.For Burst Mode operation, move Jumper JP1 to burst. IOUT is limited in Burst Mode operation. See the data sheet for more information. 9. NOTE: If VOUT drops out of regulation, check to be sure the maximum load has not been exceeded, or that VIN is not below the minimum value for regulation (see data sheet) 100 100 90 90 EFFICIENCY (%) EFFICIENCY (%) 2.With power OFF connect the power supply (PS1) as shown in Figure3 . If accurate current measurements are desired (for efficiency calculation for example) then connect an ammeter in series with the supply as shown. The ammeter is not required however. 3.Connect a 500mA load to VOUT as shown in Figure3 (10 for VOUT = 5V). Connect an ammeter if accurate current measurement or monitoring is desired. 80 70 60 50 80 70 60 LOAD = 500mA LOAD = 1A 0 5 10 15 20 25 30 35 VIN (V) Figure1. DC1687B Efficiency in PWM Mode 40 50 LOAD = 100mA LOAD = 200mA LOAD = 300mA 0 5 10 15 20 25 30 35 40 VIN (V) Figure2. DC1687B Efficiency in Burst Mode Operation Rev. 0 2 DEMO MANUAL DC1687B QUICK START PROCEDURE Figure3. Proper Measurement Equipment Setup GND VIN Figure4. Measuring Input or Output Ripple Rev. 0 3 DEMO MANUAL DC1687B PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 C1,C2 CAP CER 0.10uF 16V X7R 20% 0402 TDK, C1005X7R1C104M 2 1 C4 CAP CER 33pF 50V C0G 5% 0402 TDK, C1005C0G1H330J 3 1 C6 CAP CER 47uF 10V 20% X5R 1812 TDK, C4532X5R1A476M 4 1 C7 CAP CER 1.0uF 25V X5R 0603 TDK, C1608X5R1E105M 5 1 C8 CAP CER 3300pF 50V 5% NP0 0603 TDK, C1608C0G1H332J 6 1 C9 CAP CER 4.7uF 6.3V X5R 20% 0603 TDK, C1608X5R0J475M 7 1 C10 CAP CER 4.7uF 50V 20% X7R 1812 TDK, C4532X7R1H475M/2.00 8 1 C11 CAP CER 10pF 50V C0G 0402 TDK, C1005C0G1H100D 9 1 C12 CAP CER 1.0uF 50V X7R 20% 1206 TDK, C3216X7R1H105M 10 1 C13 CAP CER 0.1uF 50V 20% X7R 0805 TDK, C2012X7R1H104M/0.85 11 1 C14 CAP CER 1UF 50V X5R 0402 TAIYO YUDEN, UMK105CBJ105MV-F 12 2 C15,C16 CAP CER 0.1UF 50V X7R 0402 TDK, CGA2B3X7R1H104K050BB 13 1 L1 INDUCTOR, 10uH, +/-20% COILCRAFT, MSS1048-103MLB 14 2 R1,R6 RES, 1.00M OHM 1/16W 1% 0402 SMD VISHAY, CRCW04021M00FKED 15 1 R2 RES, 249k OHM 1/10W 1% 0402 SMD VISHAY, CRCW0402249KFKED 16 1 R3 RES, 15.0k OHM 1/10W 1% 0402 SMD PANASONIC, ERJ-2RKF1502X 17 1 R4 RES, 60.4k OHM 1/10W 1% 0402 SMD PANASONIC, ERJ-2RKF6042X 18 1 R7 RES, 47.5k OHM 1/10W 1% 0402 SMD VISHAY, CRCW040247K5FKED 19 1 U1 40V, 2A BUCK BOOST DC/DC CONVERTER ANALOG DEVICES, LTC3115EDHD-1 Additional Demo Board Circuit Components 1 0 C3 CAP CER 1000PF 50V 20% X7R 0402 (OPT) TDK, C1005X7R1H102M 2 0 C5 CAP ALUM 150uF 50V 20% RADIAL (OPT) PANASONIC, EEU-FM1H151 3 0 C17 CAP CER 1210 (OPT) 4 0 C18,C19 CAP CER 1206 4.7uF (OPT) 5 0 D2 DIODE SCHOTTKY 60V 3A SMA (OPT) DIODES INC.,B360A-13 6 1 D1 DIODE SCHOTTKY, 20V 1A SOD323 (OPT) NXP SEMI, PMEG2010EA 7 0 R5 RES, 0402 (OPT) 8 0 L2 INDUCTOR, 2.2uH (OPT) COILCRAFT XAL60XX SERIES 9 0 FB1 FERRITE BEAD (OPT) WURTH, 782853121 Hardware For Demo Board Only 1 5 E1-E5 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 JMP, 3PIN 1 ROW .079CC SAMTEC, TMM-103-02-L-S 3 2 XJP1,XJP2 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 4 4 SPACER STACKING #4 SCREW NYLON .500" KEYSTONE, 8833 Rev. 0 4 1 2 3 4 JP2 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. A JP1 VCC PWM OPT OPT 1 2 3 C3 C12 1uF 50V 1206 0805 C18 OPT 1206 FB1 OPT R5 PWM 1 2 RUN 3 + R6 1M C5 OPT VIN FIXED FREQ SYNCH BURST MODE OFF ON RUN GND E4 C10 4.7uF 50V 1812 2.7V - 40V VIN E3 2.7V - 40V VIN_EMI E5 C15 .1uF 50V RT 4 8 5 16 9 11 14 10 13 R7 47.5k PWM VCC CUSTOMER NOTICE C9 4.7uF 6.3V 0603 VOUT D1 PMEG2010EA OPT C14 1uF 50V VIN C1 0.1uF GND RT GND 1 6 7 3 12 APPROVALS B THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C DC1687B SKU NO. DATE: C17 OPT 1210 04-29-19 DATE www.analog.com D 04-18-19 PCA ASS'Y DWG: 705-DC1687B_REV01 GND E2 C7 1uF 25V 0603 VOUT 5.0V / 2A E1 UNLESS NOTED: RESISTORS: OHMS, 0402, 1% CAPACITORS: uF, 0402 R2 249k R1 1M C6 47uF 10V 1812 JN TITLE: DEMO CIRCUIT SCHEMATIC, 0603 R3 15k 33pF C4 PROTOTYPE C16 .1uF 50V C8 3300pF E REVISION HISTORY DESCRIPTION APPROVED D E SHEET 1 710-DC1687B_REV01 OF 1 SCHEMATIC NO. AND REVISION: 40V, 2A BUCK BOOST DC / DC CONVERTER C11 10pF SCALE = NONE SIZE: 8.5x11 RUN R4 60.4k 1 VOUT OPT D2 B360A - ECO REV C2 0.1uF U1 LTC3115EDHD-1 RUN VC FB PVOUT BST2 PWM/SYNC VCC PVCC PVIN VIN BST1 10uH L1 C LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A PCB DES. NC CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; JN HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO APP ENG. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL IC NO. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR LTC3115-1 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. C13 0.1uF 0805 C19 OPT 1206 VIN Coilcraft XAL-6030 L2 OPT B 15 SW1 A PGND 17 2 SW2 OPTIONAL EMI FILTER 1 2 3 4 DEMO MANUAL DC1687B SCHEMATIC DIAGRAM Rev. 0 5 DEMO MANUAL DC1687B ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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