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PDF SM72442 Data sheet ( Hoja de datos )
| Número de pieza | SM72442 | |
| Descripción | Programmable Maximum Power Point Tracking Controller | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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SM72442
May 12, 2011
Programmable Maximum Power Point Tracking Controller
for Photovoltaic Solar Panels
General Description
The SM72442 is a programmable MPPT controller capable of
controlling four PWM gate drive signals for a 4-switch buck-
boost converter. The SM72442 also features a proprietary
algorithm called Panel Mode which allows for the panel to be
connected directly to the output of your power optimizer cir-
cuit. Along with the SM72295 (Photovoltaic Full Bridge Driv-
er), it creates a solution for an MPPT configured DC-DC
converter with efficiencies up to 99.5%. Integrated into the
chip is an 8-channel, 12 bit A/D converter used to sense input
and output voltages and currents, as well as board configu-
ration. Externally programmable values include maximum
output voltage and current as well as different settings forslew
rate, soft-start and Panel Mode.
Features
■ Renewable Energy Grade
■ Programmable maximum power point tracking
■ Photovoltaic solar panel voltage and current diagnostic
■ Single inductor four switch buck-boost converter control
■ I2C interface for communication
■ VOUT Overvoltage protection
■ Over-current protection
Package
■ TSSOP-28
Block Diagram
www.DataSheet.net/
FIGURE 1. Block Diagram
© 2011 National Semiconductor Corporation 301343
30134302
www.national.com
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Analog Supply Voltage VA
(VDDA - VSSA)
Digital Supply Voltage VD
(VDDD - VSSD)
Voltage on Any Pin to GND
Input Current at Any Pin (Note 3)
Package Input Current (Note 3)
Storage Temperature Range
ESD Rating
Human Body Model
-0.3 to 6.0V
-0.3 to VA +0.3V
max 6.0V
-0.3 to VA +0.3V
±10 mA
±20 mA
-65°C to +150°C
(Note 2)
2 kV
Recommended Operating
Conditions
Operating Temperature
VA Supply Voltage
VD Supply Voltage
Digital Input Voltage
Analog Input Voltage
Junction Temperature
-40°C to 105°C
+4.75V to +5.25V
+4.75V to VA
0 to VA
0 to VA
-40°C to 125°C
Specifications in standard typeface are for TJ = 25°C, and those in boldface type apply over the full operating junction temperature
range.(Note 3)
Symbol
Parameter
Conditions
Min Typ Max Units
ANALOG INPUT CHARACTERISTICS
AVin, AIin
AVout, AIout
Input Range
- 0 to VA -
V
IDCL
CINA
DC Leakage Current
Input Capacitance (Note 4)
Track Mode
Hold Mode
- - ±1 µA
- 33
- pF
-3
- pF
DIGITAL INPUT CHARACTERISTICS
VIL Input Low Voltage
VIH Input High Voltage
CIND
Digital Input Capacitance (Note 4)
IIN Input Current
DIGITAL OUTPUT CHARACTERISTICS
- - 0.8 V
2.8 -
-V
- 2 4 pF
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-
±0.01
±1
µA
VOH
VOL
IOZH , IOZL
Output High Voltage
Output Low Voltage
Hi-Impedance Output Leakage
Current
ISOURCE = 200 µA VA = VD = 5V
VD - 0.5
ISINK = 200 µA to 1.0 mA VA = VD = 5V
-
VA = VD = 5V
-
-
-V
0.4 V
±1 µA
COUT
Hi-Impedance Output
Capacitance (Note 4)
2 4 pF
POWER SUPPLY CHARACTERISTICS (CL = 10 pF)
VA ,VD
Analog and Digital Supply
Voltages
VA ≥ VD
4.75 5
5.25 V
IA + ID
Total Supply Current
PC Power Consumption
PWM OUTPUT CHARACTERISTICS
VA = VD = 4.75V to 5.25V
VA = VD = 4.75V to 5.25V
- 11.5 15 mA
57.5 78.75 mW
fPWM
PWM switching frequency
220 kHz
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation
of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions,
see the Electrical Characteristics tables.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3: Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 4: Not tested. Guaranteed by design.
5 www.national.com
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
Using the I2C port, the user will be able to control the duty
cycle of the PWM signal. Input and output voltage and current
offset can also be controlled using I2C on register 4. Control
registers are available for additional flexibility.
The thresholds iin_hi_th, iin_lo_th, iout_hi_th, iout_lo_th, in
reg5 are compared to the values read in by the ADC on the
AIIN and AIOUT pins. Scaling is set by the scaling of the ana-
log signal fed into AIIN and AIOUT. These 10–bit values
determine the entry and exit conditions for MPPT.
COMMUNICATING WITH THE SM72442
The SCL line is an input, the SDA line is bidirectional, and the
device address can be set by I2C0, I2C1 and I2C2 pins. Three
device address pins allow connection of up to 7 SM72444s to
the same I2C master. A pull-up resistor (10k) to a 5V supply
is used to set a bit 1 on the device address. Device addressing
for slaves are as follows:
I2C0
0
0
0
1
1
1
1
I2C1
0
1
1
0
0
1
1
I2C2
1
0
1
0
1
0
1
Hex
0x1
0x2
0x3
0x4
0x5
0x6
0x7
The data registers in the SM72442 are selected by the Com-
mand Register. The Command Register is offset from base
address 0xE0. Each data register in the SM72442 falls into
one of two types of user accessibility:
1) Read only (Reg0, Reg1)
2) Write/Read same address (Reg3, Reg4, Reg5)
There are 7 bytes in each register (56 bits), and data must be
read and written in blocks of 7 bytes. Figure 10 depicts the
ordering of the bytes transmitted in each frame and the bits
within each byte. In the read sequence depicted in Figure
11 the data bytes are transmitted in Frames 5 through 11,
starting from the LSByte, DATA1, and ending with MSByte,
DATA7. In the write sequence depicted in Figure 12, the data
bytes are transmitted in Frames 4 through 11. Only the
100kHz data rate is supported. Please refer to “The I2C Bus
Specification” version 2.1 (Doc#: 939839340011) for more
documentation on the I2C bus.
30134316
FIGURE 10. Endianness Diagram
www.DataSheet.net/
FIGURE 11. I2C Read Sequence
11
30134312
www.national.com
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SM72442.PDF ] | |
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