MAX20801 [MAXIM]
Fast MPPT Reacts Quickly to Changing Conditions;
| 型号： | MAX20801 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Fast MPPT Reacts Quickly to Changing Conditions |
| 文件： | 总8页 (文件大小：411K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Evaluates: MAX2080, MAX20801
MAX20800 Evaluation Kit
General Description
Quick Start
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.
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:
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.
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-.
Features
● Performs MPPT on three sets of 20–24
3) Expose the PV module to steady state irradiance,
either by an indoor light table or in outdoor conditions.
Series-Connected PV Cells
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.
● Fast MPPT Reacts Quickly to Changing Conditions
● Small 3,800mm2 Solution Size
● Integrated Voltage-Limiting Clamps Output Voltage
● Integrated Current-Limiting Clamps Output Current
● Active Bypass Function Eliminates Hot Spots
● Supports Flash and EL Testing
Ordering Information appears at end of data sheet.
● Peak 99.1%, CEC 98.7%, and Euro 98.3% Efficiency
● Proven PCB Layout
● Fully Assembled and Tested
319-100320; Rev 0; 2/19
MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
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.
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+/PV3-
input terminals. Connect the output load the OUT-/OUT+
terminals.
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
Detailed Description of Hardware
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.
The MAX20800 IC is a monolithic, high-frequency step-
down 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.
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.
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.
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.
Output Limiting
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 sug-
gested to dwell at each measurement point for a minimum
of 5ms to ensure the IC settles at the new load-dependent
operating point.
The output voltage and current are electronically limited
by the switching regulator as described in the table below.
OUTPUTVOLTAGE OUTPUTCURRENT
IC PART
LIMIT (V)
11.7
LIMIT (A)
11.3
MAX20800
MAX20800A
MAX20801A
MAX20801B
MAX20801C
13.6
11.3
10.6
11.9
Carefully note the connection order and polarity of PV
input terminals when connecting the cell strings to the
EV kit.
11.2
11.9
12.4
11.9
Maxim Integrated
│ 2
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MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
Testing Configuration
20-24CELLS
OUT+
PV3-
PV3+
PV2+
PV2-
PV1-
PV1+
20-24CELLS
20-24CELLS
MAX20800
EV KIT
MAX20800
EV KIT
ELECTRONIC
LOAD
PV2-
20-24CELLS
PV1-
ELECTRONIC
LOAD
OUT-
PV1+
OUT-
TESTING THREE CELL-STRINGS
TESTING ONE CELL-STRING
Component List
PART
QTY
DESCRIPTION
PART
QTY
DESCRIPTION
MAX208000 MPPT
Regulation IC
Capacitor, 0.22µF ± 10%,
20%, 6.3V, X6S, 0402
U1, U2, U3
3
C112, C212, C312
3
SCHOTTKY RECTIFIER,
10A, 200V, POWERDI5
C66-C68, C79,
C80, C94, C95,
C323, C326,
D2
1
3
1
Capacitor, 0.1µF ± 10%, 20%,
25V, X7R, 0402
12
1
L1, L2, L3
C21
POWER INDUCTOR
C332, C333, C335
Capacitor, 0.1µF, 100V, X7R,
0603
Resistor, 10Ω ± 5%, 0.1W,
0402
R15
C21
C19, C101, C103,
C104, C106-C110,
C202-C205, C207-
C210, C301-C304,
C307-C309, C315-
C318, C320, C337
Capacitor, 0.1µF ± 10%, 20%,
100V, X7R, 0603
1
1
Capacitor, 10µF ± 10%, 20%,
25V, X6S, 0805
30
3
PCB# 35‐900368‐03‐00
Capacitor, 1.0µF ± 10%, 20%,
6.3V, X6S, 0402
C111, C211, C311
Ordering Information
PART
TYPE
MAX20800EVKIT#
MAX20800AEVKIT#
MAX20801AEVKIT#
MAX20801BEVKIT#
MAX20801CEVKIT#
EV Kit for MAX20800
EV Kit for MAX20800A
EV Kit for MAX20801A
EV Kit for MAX20801B
EV Kit for MAX20801C
Maxim Integrated
│ 3
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MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
MAX20800 EV Kit Schematic
2
1
3
1
1
1
1
1
1
1
1
1
1
V d d h
V s s
1
V d d h
V s s
1
V d d h
V s s
0
0
0
1
1
1
Maxim Integrated
│ 4
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MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
MAX20800 EV Kit PCB Layout Diagrams
MAX20800 EV Kit—Top Silk Screen
MAX20800 EV Kit—Layer 1
Maxim Integrated
│ 5
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MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
MAX20800 EV Kit PCB Layout Diagrams (continued)
MAX20800 EV Kit—Layer 2
MAX20800 EV Kit—Layer 3
Maxim Integrated
│ 6
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MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
MAX20800 EV Kit PCB Layout Diagrams (continued)
MAX20800 EV Kit—Layer 4
MAX20800 EV Kit—Component Placement
Maxim Integrated
│ 7
www.maximintegrated.com
MAX20800 Evaluation Kit
Evaluates: MAX2080, MAX20801
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
2/19
Initial release
—
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.
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Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2019 Maxim Integrated Products, Inc.
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