USER GUIDE | UG:303 PI3749-00 Eval Board User Guide 16 to 34 VIN, 24 VOUT, 200 W Cool-Power ZVS Buck-Boost ContentsPage Introduction1 Bill of Materials 2 Schematic3 Typical Connections 4 Connector Descriptions 5 PCB Metal Layers 7 Introduction The PI3749-00 Eval1 evaluation board demonstrates the features and benefits of Picor’s ZVS Buck-Boost regulator; pre-configured for a 24 VOUT voltage and rated for over 200 W of continuous power up to 85°C tAMB. Please refer to the PI3749-00's data sheet for all power specifications. The evaluation board provides several options for applying input power (VSUPPLY and GND) and output load (VOUT and GND). The user can solder tab style banana jacks or wire, use threaded connectors with retaining nuts, or solder turret pins for clip-on connections. The evaluation board comes with all of the PI3749-00’s features accessible to the user. The current monitor function (IMON) is set-up to monitor the PI3749-00’s output current, sensed across a 5 mΩ resistor. The general purpose amplifier (VDIFF) comes pre-set with a gain of 2, but can be easily re-configured for differential measurements by adding extra 0603 resistors. The I/O pins are brought out to the right edge of the evaluation board to allow for easy monitoring or for adding additional circuitry. The status of the FLT pin is indicated by a dual colored LED; red indicating a fault and green indicating no faults. The SYNCO (sync out) and SYNCI (sync in) pins are accessible to allow for paralleling or for synchronizing to an external clock. Shorting J5 on the board will connect the output of IMON to the positive input of the GP amplifier, allowing for user designed signal scaling and conditioning. A footprint for an external Soft-Start capacitor (0603) is available to tailor the start-up profile of the converter. The error amplifier’s output (EAO) is brought to a pin and in conjunction with the soft-start pin can be used for paralleling converters. The error amplifier’s input (EAIN) is not directly connected to a pin, but connects to the pin EXT_VREF via a 10k series resistor. Appling a dc voltage to this pin will allow the user to change the regulated output voltage without changing the feedback network. The board was designed with an edge connector to facilitate testing, but this connection can also be used for board evaluation. The PCB is 4 layer FR-4 170Tg material with 2oz copper per layer, ENIG pad finish and a board thickness 0f 0.062". Figure 1. PI3749-00-EVAL1 Evaluation Board UG:303 vicorpower.com Applications Engineering: 800 927.9474 Page 1 Bill of Materials Table 1. Qty Bill of Materials Populated Components 14 Designator Value C1, C2, C3, C4, C5, 10 uF Description C7, C8, C9, C10, Ceramic Cap, X5R, C11, C12, C13, C14, 50V, 1206 Vendor Name Vendor Part Number TDK C3216X5R1H106K160AB Murata GRM319R71H104KA01D Murata GRM188R71H472KA01D TDK CGA3E3X7S2A104K080AB Rohm SML-P24MUWT86 CIN1 1 C6 0.1 uF 1 CCOMP 4.7 nF Ceramic Cap, X7R, 50 V, 1206 Ceramic Cap, X7R, 50 V, 0603 1 CVDR 0.1 uF 1 D1 Fault Status 2 FT1, FT2 TEST 1, TEST 2 2 J5, J6 Ceramic Cap, X7S, 100 V, 0603 1 x 1 mm Dual Color SM LED SM Testpoint Keystone 5015 0.1” Header Jumper Samtec TSW-148-07-F-S 1 L1 65nH FP0404 Series Inductor Cooper FP0404R1-R065-R 1 LMAG 480nH HCV1206 Inductor Cooper HCV1206-R48-R 1 PCB PICOR PCB0175rA 1 PI3749 PICOR PI3749-00-LGIZ PI3749-XX Edge Connector Eval Board ZVS Buck-Boost Low Voltage ZVS B-B SIP 10 x 14 mm 1 5 R5 RDIFF1, RDIFF2, REA3, RFLT, RSYNCI 1.00k Resistor, 1%, 0.1 W, 0603 Rohm MCR03EZPFX1001 10.0K Resistor, 1%, 0.1 W, 0603 Rohm MCR03EZPFX1002 1 REA1 14.0K Resistor, 1%, 0.1 W, 0603 Yageo RC0603FR-0714KL 1 REA4 1.07K Resistor, 1%, 0.1W, 0603 Yageo RC0603FR-071K07L 1 RGP 49.9 Resistor, 1%, 0.1 W, 0603 Rohm MCR03ERTF49R9 1 RIN 1 Resistor, 1%, 0.25 W, 1206 Rohm MCR18ERTFL1R00 1 RSENSE .005 Resistor, 1%, 1 W, 2512 Panasonic ERJ-M1WSF5M0U 1 RZ1 0 Resistor, 1%, 0.1 W, 0603 Rohm MCR03EZPJ000 Fairchild NC7WZ14EP6X 1 U1 NC7WZ14EP6X Dual Schmidt trigger Inverter Non-Populated Components Table 2. Bill of Material Non-Populated Components Qty Designator Description 3 REA2, RIMON, RZ2 Resistor, 1%, 0.1 W, 0603 4 R1, R2, R3, R4 Factory Use Only 14 EAO, EXT_VREF, FLT, IMON, SGND1, SGND2, SS/ TRK, SYNCI, SYNCO, VDIFF, VDR, VIN, VSN, VSP Thru-hole Testpoints, Vector K24C 3 CEAIN1, CEAO, CTRK Ceramic Cap, 50 V, 0603 1 CIN2 Bi-Polar Capacitor, Nichicon UPW2A330MPD or equivalent 1 JVIN Johnson Jack, Tektronix 131503100 3 ENABLE, FT3, FT4 SM Testpoint, Keystone 5015 1 JGP 0.1” Header Jumper UG:303 vicorpower.com Applications Engineering: 800 927.9474 Page 2 Figure 2. Evaluation Board Schematic UG:303 vicorpower.com Applications Engineering: 800 927.9474 Page 3 Figure 3. Evaluation Board Details Typical Connections Figure 4 illustrates the typical input supply and output load connections required to power the PI3749-00 evaluation board. The test points on the right side of the board provide access to key nodes used to assess the board's performance. The jumper "JGP" provides an access point that allows the user to add a small signal in the feedback loop to make Gain/Phase measurements. The jumper J5 will connect the IMON output signal to the positive input of the general purpose amplifier, allowing this signal to be scaled. The J6 jumper will disable the converter when connected. JVIN is an unpopulated "Johnson Jack" location that could be used to measure input ripple voltage. Figure 4. Typical Input and Output Connections. UG:303 vicorpower.com Applications Engineering: 800 927.9474 Page 4 PICOR PCB Edge Connector Description SAMTEC Reference Mechanical Drawings: based on EXTreme LPHPower™ Socket Assembly series, available from Samtec’s website PCB Dimensions: “Recommended PCB layout for LPHS-XX-XX-X-VXX-XX PCB Layout.pdf” Right Angle Socket: “LPHS-XX-XX-X-RTX-XX-MKT.pdf” Vertical Socket: “LPHS-XX-XX-X-VXX-XX-MKT.pdf” Figure 5. Edge Connector Details PAD Numbering Figure 6. Top (Component) View Figure 7. Bottom View UG:303 vicorpower.com Applications Engineering: 800 927.9474 Page 5 Schematic Symbol PAD Definitions PAD NAME Description P1,P2 PGND Power ground connection for the input supply and output load. P3 VOUT Output voltage connection P4 VSUPPLY Input voltage connection 1, 2, 6, 7, 8, 10 SGND Signal ground used as reference for I/O measurements 11, 12 PGND Power ground used as reference for input and output voltage measurements 3 ENABLE SIP enable 4 FT4 TEST 4, Factory use only 5 FT3 TEST 3, Factory use only 9 FT1 TEST 1, Factory use only 13 DAC External voltage node to adjust regulated output voltage (EXT_VREF) 14 EAO Error amplifier output 15 VDIFF Differential amplifier output 16 VSN Differential amplifier inverting input 17 VPN Differential amplifier non-inverting input 18 SYNCO Sync output pin 19 SYNCI Sync input pin 20 FLT SIP fault status pin 21 FT2 TEST 2, Factory use only 22 VDR SIP’s (internal or external) VDR voltage supply 23 ISN Remote sensed output voltage, after the IMON resistor 24 VIN Input supply voltage measured at SIP’s input UG:303 vicorpower.com Applications Engineering: 800 927.9474 Page 6 PCB Artwork The Power Behind Performance Rev 1.1a 08/15 vicorpower.com Applications Engineering: 800 927.9474 Page 7