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SM72441 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce SM72441
Description  SM72441 Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

SM72441 Fiches technique(HTML) 8 Page - Texas Instruments

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SM72441
SNOSB64G – OCTOBER 2010 – REVISED APRIL 2013
www.ti.com
CONFIGURABLE SETTINGS
The voltage on A0 sets the max output voltage; whereas the voltage on A2 enables MPPT update rate and limits
the max boost ratio when output current is below the standby threshold. Output current limit is set by the voltage
on A4 and output voltage slew rate limit is set on A6. In order to set a slew rate limit of 125V/sec, the ratio of the
two resistors in A6 should be 9:1.
The low current condition is detected if the voltage on AIIN is less than 0.488V (rising) and 0.293 (falling) +
ΔI or
if the voltage on AIOUT is less than 0.488 V (rising) and 0.293 (falling) +
ΔI. If low current is detected, the
converter operates in standby mode and limit the maximum duty cycle to either a 1 (buck-boost), 1.15 (boost) or
1.25 (boost) conversion ratio (programmable). In this case no MPPT will be performed.
The actual value of current will depend on the gain of the current sensing amplifier circuitry that feeds the AIIN
and AIOUT pins.
For more complete information on the various settings based on the voltage level of A2, please refer to Table 1
below. Vfs denotes the full scale voltage of the ADC which is equal to VDDA where VDDA is a reference voltage
to analog ground.
A typical value for top configuration resistors (RT1 to RT4) should be 20 k
Ω.
Table 1. List of Configurable Modes on ADC Channel 2
Low Current
ADC Channel 2
MPPT Update Time
Slew Rate Detection
Initial Boost Ratio
Delta I
Detection
0 < VADC2 < Vfs/16
1.2 ms
Disabled
Disabled
N/A
N/A
1Vfs/16 < VADC2 <2Vfs/16
38 ms
Disabled
Disabled
N/A
N/A
2Vfs/16 < VADC2 <3Vfs/16
77 ms
Disabled
Disabled
N/A
N/A
3Vfs/16 < VADC2 <4Vfs/16
38 ms
Enabled
Disabled
N/A
N/A
4Vfs/16 < VADC2 <5Vfs/16
38 ms
Enabled
Enabled
1.15
60 (0.3 A)
5Vfs/16 < VADC2 <6Vfs/16
38 ms
Enabled
Enabled
1.15
90 (0.45 A)
6Vfs/16 < VADC2 <7Vfs/16
38 ms
Enabled
Enabled
1.15
120(0.6 A)
7Vfs/16 < VADC2 <8Vfs/16
38 ms
Enabled
Enabled
1.25
60
8Vfs/16 < VADC2 <9Vfs/16
38 ms
Enabled
Enabled
1.25
90
9Vfs/16 < VADC2 <10Vfs/16
38 ms
Enabled
Enabled
1.25
120
10Vfs/16 < VADC2 <11Vfs/16
77 ms
Enabled
Enabled
1.15
60
11Vfs/16 < VADC2 <12Vfs/16
77 ms
Enabled
Enabled
1.15
90
12Vfs/16 < VADC2 <13Vfs/16
77 ms
Enabled
Enabled
1.15
120
13Vfs/16 < VADC2 <14Vfs/16
77 ms
Enabled
Enabled
1.25
60
14Vfs/16 < VADC2 <15Vfs/16
77 ms
Enabled
Enabled
1.25
90
15Vfs/16 < VADC2 <16Vfs/16
77 ms
Enabled
Enabled
1.25
120
8
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Product Folder Links: SM72441


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