MAX20801AEVKIT#

Click here for production status of specific part numbers. MAX20800 Evaluation Kit General Description The MAX2080XXEVKIT# family of evaluation kits (EV kits) serve as a reference platform for evaluating the MAX20800 and MAX20801 maximum power point tracking (MPPT) ICs. These single-chip, integrated switching regulators provide an extremely compact, low cost, highly efficient, fast, accurate and reliable power delivery solution for photovoltaic (PV) modules. Refer to the MAX20800 and MAX20801 IC data sheets for more information. Features ●● Performs MPPT on three sets of 20–24 Series-Connected PV Cells ●● Fast MPPT Reacts Quickly to Changing Conditions ●● Small 3,800mm2 Solution Size ●● Integrated Voltage-Limiting Clamps Output Voltage Quick Start Required Equipment ●● MAX20800 EV kit ●● Six-busbar PV module ●● Electronic load ●● Multimeters Procedure for One Cell String The EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Connect the positive and negative terminals of a single cell string to PV1+ and PV1- terminals of the EV kit. 2) Connect the positive terminal of the load to PV2- and the negative terminal of the load to OUT-. 3) Expose the PV module to steady state irradiance, either by an indoor light table or in outdoor conditions. 4) It is important to ensure the proper connection polarity of the PV Cells with respect to the physical PCB terminal connectors, see Testing Configuration diagrams. ●● Integrated Current-Limiting Clamps Output Current ●● Active Bypass Function Eliminates Hot Spots ●● Supports Flash and EL Testing ●● Peak 99.1%, CEC 98.7%, and Euro 98.3% Efficiency ●● Proven PCB Layout ●● Fully Assembled and Tested 319-100320; Rev 0; 2/19 Ordering Information appears at end of data sheet. PRELIMINARY The EV kit comprises a fully-assembled and tested PCB implementation of the MAX20800. Input and output connectors for three photovoltaic cell strings are included for flexibility and ease-of-use with standard 60 or 72-cell crystalline PV modules. Evaluates: MAX2080, MAX20801 MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 Procedure for Three Cell Strings Connecting all three cell strings from a PV Module to the EV kit requires a six-busbar module, whereby the two electrical connections between the three cell strings are intentionally left independent. If such a PV Module is not available, it is recommended to test one cell string. To connect a six-busbar module to the EV kit, follow the same procedure as above but connect one cell string to each of the PV1+/PV1-, PV2+/PV2-, and PV3+/PV3input terminals. Connect the output load the OUT-/OUT+ terminals. Detailed Description of Hardware Always Enabled The switching regulator is always enabled so long as power is available on the input pins. MPPT Tracking The MAX20800 switching regulator performs MPPT stepping every 0.4ms. This speed is fast enough to present a quasi-static IV curve to standard PV string and panel inverter loads, but not fast enough to operate with typical PV simulator power supplies or flash testers. For this reason, it is encouraged to test the MAX20800 EV kit with the PV module exposed to the steady state irradiance of an indoor light table or on-sun as an input, and an electronic load on the output. Output Limiting The output voltage and current are electronically limited by the switching regulator as described in the table below. IC PART OUTPUT VOLTAGE LIMIT (V) OUTPUT CURRENT LIMIT (A) MAX20800 11.7 11.3 MAX20800A 13.6 11.3 MAX20801A 10.6 11.9 MAX20801B 11.2 11.9 MAX20801C 12.4 11.9 www.maximintegrated.com Meanwhile, the voltage and current capability of the input connected PV cell strings can exceed these output limits but should remain below the maximum input operating conditions specified in the IC data sheet. Input Voltage and Current Each cell string input voltage and current can be measured directly at its respective PV+/PV- input terminals. Voltage should be measured directly at the pads with kelvin connections, meanwhile a low resistance (i.e., 1mΩ) shunt should be placed in series with PV+ to measure current. The shunt should be carefully calibrated to minimize measurement errors. Output Voltage and Current The output voltage and current can be measured at the OUT-/PV2- terminals while operating a single cell string or OUT-/OUT+ while operating with all three cell strings. Voltage should be measured directly at the pads with kelvin connections, meanwhile a low resistance (i.e., 1mΩ) shunt should be placed in series with the output to measure current. The shunt should be carefully calibrated to minimize measurement errors. Efficiency Testing Both power conversion and MPPT efficiency can be tested by comparing the power output to a Reference PV module. In order to avoid the influence of dynamically changing conditions while operating on-sun, it is highly suggested to operate the DUT and Reference modules at the same time with near simultaneous data acquisitions. MPPT Efficiency can be measured by comparing the input power to the IC to that delivered by the Reference module operating at the MPP condition. The electronic load can be programmed to operate at MPP or perform continual IV sweeps. If performing IV sweeps, it is suggested to dwell at each measurement point for a minimum of 5ms to ensure the IC settles at the new load-dependent operating point. Carefully note the connection order and polarity of PV input terminals when connecting the cell strings to the EV kit. Maxim Integrated │  2 PRELIMINARY The MAX20800 IC is a monolithic, high-frequency stepdown switching regulator optimized for performing MPPT on 20-24 crystalline photovoltaic cells. In order to support the MAX20800 application, PV Modules must be designed with six-busbar connections to the junction box, as opposed to the typical four. Detailed product and application information is provided in the MAX20800 IC data sheet. The output IV characteristics are such that maximum output power is delivered into any voltage or current load so long as the output voltage and current limits are not exceeded. If the output voltage exceeds the voltage limit the switching regulator will actively sink current. If the output current exceeds the current limit the cell string will be bypassed by a low-resistance FET. MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 Testing Configuration – + 20-24 CELLS OUT+ PV3PV3+ ELECTRONIC LOAD PV1PV1+ PV2+ 20-24 CELLS OUT- ELECTRONIC LOAD MAX20800 EV KIT PV2- – – + 20-24 CELLS PV2- + MAX20800 EV KIT + – 20-24 CELLS PV1OUT- PV1+ Component List PART QTY DESCRIPTION U1, U2, U3 3 MAX208000 MPPT Regulation IC D2 1 SCHOTTKY RECTIFIER, 10A, 200V, POWERDI5 L1, L2, L3 3 POWER INDUCTOR C21 1 Capacitor, 0.1µF, 100V, X7R, 0603 C19, C101, C103, C104, C106-C110, C202-C205, C207C210, C301-C304, C307-C309, C315C318, C320, C337 30 Capacitor, 10µF ± 10%, 20%, 25V, X6S, 0805 C111, C211, C311 3 Capacitor, 1.0µF ± 10%, 20%, 6.3V, X6S, 0402 PART QTY DESCRIPTION C112, C212, C312 3 Capacitor, 0.22µF ± 10%, 20%, 6.3V, X6S, 0402 C66-C68, C79, C80, C94, C95, C323, C326, C332, C333, C335 12 Capacitor, 0.1µF ± 10%, 20%, 25V, X7R, 0402 R15 1 Resistor, 10Ω ± 5%, 0.1W, 0402 C21 1 Capacitor, 0.1µF ± 10%, 20%, 100V, X7R, 0603 1 PCB# 35‐900368‐03‐00 Ordering Information PART MAX20800EVKIT# MAX20800AEVKIT# TYPE EV Kit for MAX20800 EV Kit for MAX20800A MAX20801AEVKIT# EV Kit for MAX20801A MAX20801BEVKIT# EV Kit for MAX20801B MAX20801CEVKIT# EV Kit for MAX20801C www.maximintegrated.com Maxim Integrated │  3 PRELIMINARY TESTING THREE CELL-STRINGS TESTING ONE CELL-STRING 1UF C111 1UF C211 TP1 1 TP28 VCC3 DNI R1 TP9 VCC1 C312 DNI R2 0.22UF C212 R3 DNI 0.22UF TP18 VCC2 TP14 1UF C311 1 TP24 C112 0.22UF 1 1 0 0 VX1 VSS1 VBST1 VLIM1 VX2 VBST2 VLIM2 VX3 VBST3 VLIM3 GND3 Vcc VLIM GND1 GND2 SD Vbst GND3 Vcc VLIM GND1 GND2 SD Vbst GND3 Vcc VLIM GND1 GND2 SD Vbst QFN U3 QFN U2 TP7 QFN U1 U1 U2 TP16 U3 Vx Vx Vx 1 TP8 MAX20800 VX1 0.1UF C66 MAX20800 VX2 TP17 1 C335 0.1UF MAX20800 VX3 TP27 L3 L2 C79 0.1UF 2 TP6 0.68UH L1 0.1UF C67 TP15 0.68UH 1 2 0.1UF C332 TP32 0.68UH 0.1UF C94 C68 0.1UF 2 0.1UF C95 0.1UF C80 All 0.1uF caps must be rated at 25V Murata part #: GRM21BC81E106KE12 C323 0.1UF C326 0.1UF C108 10UF 10UF C207 VSS3 10UF C308 VOUT3 0.1UF C333 10UF C109 10UF C209 10UF C309 10UF C110 10UF 10UF C210 C310 DNI 10UF DNI C336 10UF C337 10UF C101 10UF 10UF C107 DNI C102 10UF VSS2 C208 10UF C203 C307 10UF C302 10UF C202 10UF 10UF C301 VSS1 10UF C103 VDDH1 VSS2 10UF C204 VDDH2 10UF C303 10UF C104 10UF C205 10UF C314 10UF C106 10UF DNI C206 DNI VSS3 10UF C304 VDDH3 All 10uF caps must be rated at 25V Murata part #: GRM21BC81E106KE11 C317 10UF 10UF C19 10UF C315 10UF C318 10UF C320 10UF C316 TP30 TP25 1 1 Vddh Vss 1 Vddh Vss 1 0 TP10 1 1 1 1 1 Vddh Vss PV3+ PV3- PV2+ PV2- PV1+ PV1- SOLDERPAD_8MMX8MM TP2 SOLDERPAD_8MMX8MM TP4 SOLDERPAD_8MMX8MM TP11 D2 SBR10U200P5 SOLDERPAD_8MMX8MM TP19 SOLDERPAD_8MMX8MM TP21 SOLDERPAD_8MMX8MM TP29 1 1 1 1 3 2 TP26 PRELIMINARY 1 www.maximintegrated.com 1 OUT+ Vout- MTG2 SOLDERPAD_10MMX4_5MM_DRL OUT- VSS1 VSS2 VSS1 VSS2 0.1UF C21 10 R15 SOLDERPAD_10MMX4_5MM_DRL Vout+ MTG1 MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 MAX20800 EV Kit Schematic Maxim Integrated │  4 MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 MAX20800 EV Kit PCB Layout Diagrams PRELIMINARY MAX20800 EV Kit—Top Silk Screen MAX20800 EV Kit—Layer 1 www.maximintegrated.com Maxim Integrated │  5 MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 MAX20800 EV Kit PCB Layout Diagrams (continued) PRELIMINARY MAX20800 EV Kit—Layer 2 MAX20800 EV Kit—Layer 3 www.maximintegrated.com Maxim Integrated │  6 MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 MAX20800 EV Kit PCB Layout Diagrams (continued) PRELIMINARY MAX20800 EV Kit—Layer 4 MAX20800 EV Kit—Component Placement www.maximintegrated.com Maxim Integrated │  7 MAX20800 Evaluation Kit Evaluates: MAX2080, MAX20801 Revision History REVISION NUMBER REVISION DATE 0 2/19 DESCRIPTION Initial release PAGES CHANGED — PRELIMINARY For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2019 Maxim Integrated Products, Inc. │  8