SM72441MT/NOPB [TI]
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SM72441
www.ti.com
SNOSB64G –OCTOBER 2010–REVISED APRIL 2013
SM72441 Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar
Panels
Check for Samples: SM72441
1
FEATURES
DESCRIPTION
The SM72441 is a programmable MPPT controller
capable of controlling four PWM gate drive signals for
a 4-switch buck-boost converter. Along with SM72295
(Photovoltaic Full Bridge Driver) it creates a solution
for an MPPT configured DC-DC converter with
efficiencies up to 98.5%. Integrated into the chip is an
8-channel, 12 bit A/D converter used to sense input
and output voltage and current, as well as board
configuration. Externally programmable values
include maximum output voltage and current as well
as different settings on slew rate, and soft-start.
2
•
Renewable Energy Grade
•
•
Programmable Maximum Power Point Tracking
Photovoltaic Solar Panel Voltage and Current
Diagnostic
•
Single Inductor Four Switch Buck-boost
Converter Control
•
•
VOUT Overvoltage Protection
Over-Current Protection
PACKAGE
•
TSSOP-28
Block Diagram
VDDA
VDDD
AVin
AIin
Vin
AIN0
AIN1
D0
Iin
D1
Vout
Iout
D2
HIB
LIB
D3
D4
D5
D6
D7
CS_N
SCLK
AVout
AIout
AIN2
AIN3
MPPT CONTROLLER
HIA
LIA
DIN
ADC
CONTROLLER
ADC
DOUT
AIN4
AIN5
A0
A2
AIN6
AIN7
A4
A6
ADC_C
CLK GEN
VSSA
VSSD
Figure 1. Block Diagram
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2013, Texas Instruments Incorporated
SM72441
SNOSB64G –OCTOBER 2010–REVISED APRIL 2013
www.ti.com
PV(+)
Vo
Rsen_in
Gate 2
Gate 4
Current Sensing Amplifier
R
R
Vo
Rsen_out
Gate 3
5V
0.01 mF
2.2 mF
0.01 mF
2.2 mF
0.01 mF
Gate 1
PV(-)
49.9W
5V
VDDA
VDDD
AIIN
AVIN
NC7
NC1
Current Sensing Amplifier
Current sensing Amplifier
RT1
RT2
RT3
RT4
Current Sensing Amplifier
AIOUT
PWM4
A0
A2
A4
A6
Gate 4
HIB
LIB
HIA
PWM3
PWM2
Gate 3
Gate 2
Gate 1
PWM1
mF
0.1 mF
RB1
0.1 mF
0.1 mF
H-Bridge Driver
LIA
5V
SM72441
10k
5V
NC2
NC5
NC6
NC3
RB2
RB3
RB4
150k
10k
10k
10k
10k
10k
NC9
RST
OVP
10k
10k
CONFIGURATION RESISTOR
NC4
NC8
RFB1
AVOUT
VSSD
LED
RFB2
VSSA
Figure 2. Typical Application Circuit
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SNOSB64G –OCTOBER 2010–REVISED APRIL 2013
Connection Diagram
Top View
1
2
3
28
27
26
OVP
LIA
RST
NC1
VDDD
VSSD
NC2
NC3
NC4
NC5
NC6
NC7
LED
HIA
4
5
6
7
8
25
24
23
22
21
HIB
LIB
NC9
NC8
AIOUT
A6
SM72441
9
10
11
12
20
19
18
17
AIIN
A4
AVOUT
A2
VDDA
VSSA
A0
13
14
16
15
AVIN
Figure 3. TSSOP-28 Package
See Package Drawing PW0028A
Pin Descriptions
Description
Pin
1
Name
RST
Active low signal. External reset input signal to the digital circuit.
No Connect. This pin should be grounded.
2
NC1
3
VDDD Digital supply voltage. This pin should be connected to a 5V supply, and bypassed to VSSD with a 0.1uF monolithic
ceramic capacitor.
4
5
VSSD Digital ground. The ground return for the digital supply and signals.
NC2
NC3
NC4
NC5
NC6
NC7
LED
No Connect. This pin should be pulled up to the 5V supply using 10k resistor.
No Connect. This pin should be grounded using a 10k resistor.
No Connect. This pin should be grounded using a 10k resistor.
No Connect. This pin should be pulled up to 5V supply using 10k resistor.
No Connect. This pin should be pulled up to 5V supply using 10k resistor.
No Connect. This pin should be grounded.
6
7
8
9
10
11
12
LED pin outputs a pulse during normal operation.
VDDA Analog supply voltage. This voltage is also used as the reference voltage. This pin should be connected to a 5V supply,
and bypassed to VSSA with a 1uF and 0.1uF monolithic ceramic capacitor.
13
14
VSSA Analog ground. The ground return for the analog supply and signals.
A0
A/D Input Channel 0. Connect a resistor divider to 5V supply to set the maximum output voltage. Please refer to
application section for more information on setting the resistor value.
15
16
AVIN A/D Input to sense input voltage.
A2
A/D Input Channel 2. Connect a resistor divider to 5V supply to set MPPT update rate. Please refer to application section
for more information on setting the resistor value.
17
18
AVOUT A/D Input to sense the output voltage.
A4
A/D Input Channel 4. Connect a resistor divider to 5V supply to set the maximum output current. Please refer to
application section for more information on setting the resistor value.
19
20
AIIN
A6
A/D Input to sense input current.
A/D Input Channel 6. Connect a resistor divider to 5V supply to set the maximum output voltage slew rate. Please refer to
application section for more information on setting the resistor value.
21
AIOUT A/D Input to sense the output current.
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Pin Descriptions (continued)
Pin
22
23
24
25
26
27
28
Name
NC8
NC9
LIB
Description
No Connect. This pin should be grounded using a 10k resistor.
No Connect. This pin should be connected with 150k pull-up resistor to 5V supply.
Low side boost PWM output.
HIB
High side boost PWM output.
HIA
High side buck PWM output.
LIA
Low side buck PWM output.
OVP
Overvoltage Protection Pin. Active Low. SM72441 will reset once voltage on this pin drops below its threshold voltage.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings(1)(2)
Analog Supply Voltage VA (VDDA -VSSA)
Analog Supply Voltage VD (VDDD -VSSD)
Voltage on Any Pin to GND
-0.3 to 6.0V
-0.3 to VA +0.3V, max 6.0V
-0.3 to VA +0.3V
±10 mA
Input Current at Any Pin (Note 3)
Package Input Current (Note 3)
Storage Temperature Range
±20 mA
-65°C to +150°C
2 kV
ESD Rating(3)
Human Body Model
(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 ensured. Operating Ratings indicate conditions for which the device is intended to be functional, but
does not ensure specific performance limits. For specified performance limits and associated test conditions, see the Electrical
Characteristics tables.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Recommended Operating Conditions
Operating Temperature
-40°C to 105°C
+4.75V to +5.25V
+4.75V to VA
0 to VA
VA Supply Voltage
VD Supply Voltage
Digital Input Voltage
Analog Input Voltage
Junction Temperature
0 to VA
-40°C to 125°C
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SNOSB64G –OCTOBER 2010–REVISED APRIL 2013
Electrical Characteristics
Specifications in standard typeface are for TJ = 25°C, and those in boldface type apply over the full operating junction
temperature range.(1)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
ANALOG INPUT CHARACTERISTICS
AVin, AIin
Input Range
AVout, AIout
-
0 to VA
-
V
IDCL
DC Leakage Current
Input Capacitance(2)
-
-
-
-
±1
-
µA
pF
pF
Track Mode
Hold Mode
33
3
CINA
-
DC Voltage Measurement
Accuracy
VERR
0.1
%
DIGITAL INPUT CHARACTERISTICS
VIL
Input Low Voltage
Input High Voltage
Digital Input Capacitance(2)
Input Current
-
2.8
-
-
0.8
-
V
V
VIH
CIND
IIN
-
2
4
pF
µA
-
±0.01
±1
DIGITAL OUTPUT CHARACTERISTICS
VOH
VOL
Output High Voltage
Output Low Voltage
ISOURCE = 200 µA VA = VD = 5V
VD-0.5
-
-
-
V
V
ISINK = 200 µA to 1.0 mA VA = VD = 5V
-
0.4
Hi-Impedance Output Leakage
Current
IOZH , IOZL
COUT
VA = VD = 5V
±1
4
µA
pF
Hi-Impedance Output
Capacitance(2)
2
5
POWER SUPPLY CHARACTERISTICS (CL = 10 pF)
Analog and Digital Supply
Voltages
VA ,VD
VA ≥ VD
4.75
5.25
V
IA + ID
PC
Total Supply Current
Power Consumption
VA = VD = 4.75V to 5.25V
VA = VD = 4.75V to 5.25V
7
10
50
15
78
mA
mW
PWM OUTPUT CHARACTERISTICS
fPWM
PWM switching frequency
Dead time
210
38
kHz
ns
tDEAD
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are specified through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instrument’s Average Outgoing Quality Level
(AOQL).
(2) Not tested. Specified by design.
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SNOSB64G –OCTOBER 2010–REVISED APRIL 2013
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OPERATION DESCRIPTION
OVERVIEW
The SM72441 is a programmable MPPT controller capable of outputting four PWM gate drive signals for a 4-
switch buck-boost converter. Refer to the Typical Application Circuit diagram (Figure 2).
The SM72441 uses an advanced digital controller to generate its PWM signals. A maximum power point tracking
(MPPT) algorithm monitors the input current and voltage and controls the PWM duty cycle to maximize energy
harvested from the photovoltaic module. MPPT performance is very fast. Convergence to the maximum power
point of the module typically occurs within 0.01s. This enables the controller to maintain optimum performance
under fast-changing irradiance conditions.
Transitions between buck, boost, and buck-boost modes are smoothed, and advanced digital PWM dithering
techniques are employed to increase effective PWM resolution. Output voltage and current limiting functionality
are integrated into the digital control logic. The controller is capable of handling both shorted and no-load
conditions and will recover smoothly from both.
RESET
SOFT-START
RST Pin is low or
OVP Pin is low
Iout < Iout_th
Buck
Boost
Iout >= Iout_th
Iout >=
Iout_th
Iout < Iout_th
MPPT
Figure 4. High Level State Diagram for Startup
STARTUP
SM72441 has a soft start feature that will ramp its output voltage for a fixed time of 250ms. MPPT mode will be
entered during soft start if the load current exceeded the minimum current threshold. Otherwise, buck-boost
operation is entered after soft-start is finished where the ratio between input and output voltage is 1:1. Refer to
Figure 4 for a high level state diagram of startup. The current threshold to transition between MPPT to standby
(buck-boost) mode and vice versa can be set by feeding the output of current sensing amplifier (Figure 2) to the
AIIN and AIOUT pin. For an appropriate voltage level, refer to the AIIN AND AIOUT PIN section of this
datasheet.
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Figure 5. Start-Up Waveforms of Controlled Output
MAXIMUM OUTPUT VOLTAGE
Maximum output voltage on the SM72441 is set by resistor divider ratio on pin A0. (Please refer to Figure 2
Typical Application Circuit).
(RFB1 + RFB2)
RFB2
RB1
VOUT_MAX = 5 x
x
RT1 + RB1
(1)
Where RT1 and RB1 are the resistor divider on the ADC pin A0 and RFB1 and RFB2 are the output voltage
feedback resistors. A typical value for RFB2 is about 2 kΩ.
CURRENT LIMIT SETTING
Maximum output current can be set by changing the resistor divider on A4 (pin 18). (Refer to Figure 2 ).
Overcurrent at the output is detected when the voltage on AIOUT (pin 21) equals to the voltage on A4 (pin 18).
The voltage on A4 can be set by a resistor divider connected to 5V whereas a current sense amplifier output can
be used to set the voltage on AIOUT.
AIIN AND AIOUT PIN
These two pins are used to set current threshold from standby (buck-boost mode) to MPPT mode and from
MPPT mode into standby mode.
In order to transition from standby to MPPT mode, the following conditions have to be satisfied:
1) AIIN and AIOUT voltage > 0.488V
2) Iout < Iout_max
On the other hand, in order to transition from MPPT to standby mode, the following condition have to be
satisfied:
1) AIIN and AIOUT voltage < 0.293V
2) Iout < Iout_max
Current limit is triggered when AIOUT (pin 21) voltage is equal to A4 (pin 18).
AVIN PIN
AVIN pin is an A/D input to sense the input voltage of SM72441. A resistor divider can be used to scale the max
voltage to about 4V, which is 80% of the full scale of the A/D input.
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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 kΩ.
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
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
0 < VADC2 < Vfs/16
1.2 ms
38 ms
77 ms
38 ms
38 ms
38 ms
38 ms
38 ms
38 ms
38 ms
77 ms
77 ms
77 ms
77 ms
77 ms
77 ms
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
N/A
N/A
N/A
N/A
1Vfs/16 < VADC2 <2Vfs/16
2Vfs/16 < VADC2 <3Vfs/16
3Vfs/16 < VADC2 <4Vfs/16
4Vfs/16 < VADC2 <5Vfs/16
5Vfs/16 < VADC2 <6Vfs/16
6Vfs/16 < VADC2 <7Vfs/16
7Vfs/16 < VADC2 <8Vfs/16
8Vfs/16 < VADC2 <9Vfs/16
9Vfs/16 < VADC2 <10Vfs/16
10Vfs/16 < VADC2 <11Vfs/16
11Vfs/16 < VADC2 <12Vfs/16
12Vfs/16 < VADC2 <13Vfs/16
13Vfs/16 < VADC2 <14Vfs/16
14Vfs/16 < VADC2 <15Vfs/16
15Vfs/16 < VADC2 <16Vfs/16
N/A
N/A
N/A
N/A
1.15
1.15
1.15
1.25
1.25
1.25
1.15
1.15
1.15
1.25
1.25
1.25
60 (0.3 A)
90 (0.45 A)
120(0.6 A)
60
90
120
60
90
120
60
90
120
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SNOSB64G –OCTOBER 2010–REVISED APRIL 2013
RESET PIN
When the reset pin is pulled low, the chip will cease its normal operation and turn-off all of its PWM outputs.
Below is an oscilloscope capture of a forced reset condition.
Figure 6. Reset Operational Behavior
As seen in Figure 6, the initial value for output voltage and load current are 28V and 1A respectively. After the
reset pin is grounded, both the output voltage and load current decreases immediately. MOSFET switching on
the buck-boost converter also stops immediately. VLOB indicates the low side boost output from the SM72295.
ANALOG INPUT
An equivalent circuit for one of the ADC input channels is shown in Figure 7. Diode D1 and D2 provide ESD
protection for the analog inputs. The operating range for the analog inputs is 0V to VA. Going beyond this range
will cause the ESD diodes to conduct and result in erratic operation.
The capacitor C1 in Figure 7 has a typical value of 3 pF and is mainly the package pin capacitance. Resistor R1
is the on resistance of the multiplexer and track / hold switch; it is typically 500Ω. Capacitor C2 is the ADC
sampling capacitor; it is typically 30 pF. The ADC will deliver best performance when driven by a low-impedance
source (less than 100Ω). This is especially important when sampling dynamic signals. Also important when
sampling dynamic signals is a band-pass or low-pass filter which reduces harmonic and noise in the input. These
filters are often referred to as anti-aliasing filters.
V
A
D
1
2
R
1
C
2
V
IN
30 pF
C
1
D
3 pF
Conversion Phase: Switch Open
Track Phase: Switch Close
Figure 7. Equivalent Input Circuit
DIGITAL INPUTS AND OUTPUTS
The digital input signals have an operating range of 0V to VA, where VA = VDDA - VSSA. They are not prone to
latch-up and may be asserted before the digital supply VD, where VD = VDDD - VSSD, without any risk. The
digital output signals operating range is controlled by VD. The output high voltage is VD – 0.5V (min) while the
output low voltage is 0.4V (max).
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REVISION HISTORY
Changes from Revision F (April 2013) to Revision G
Page
•
Changed layout of National Data Sheet to TI format ............................................................................................................ 9
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PACKAGE OPTION ADDENDUM
www.ti.com
2-Apr-2013
PACKAGING INFORMATION
Orderable Device
SM72441MT/NOPB
SM72441MTE/NOPB
SM72441MTX/NOPB
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
Samples
Drawing
Qty
(1)
(2)
(3)
(4)
ACTIVE
TSSOP
TSSOP
TSSOP
PW
28
28
28
48
Green (RoHS
& no Sb/Br)
CU SN
CU SN
CU SN
Level-3-260C-168 HR
Level-3-260C-168 HR
Level-3-260C-168 HR
S72441
ACTIVE
ACTIVE
PW
PW
250
Green (RoHS
& no Sb/Br)
S72441
S72441
2500
Green (RoHS
& no Sb/Br)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a
continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Apr-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
SM72441MTE/NOPB
SM72441MTX/NOPB
TSSOP
TSSOP
PW
PW
28
28
250
178.0
330.0
16.4
16.4
6.8
6.8
10.2
10.2
1.6
1.6
8.0
8.0
16.0
16.0
Q1
Q1
2500
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Apr-2013
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
SM72441MTE/NOPB
SM72441MTX/NOPB
TSSOP
TSSOP
PW
PW
28
28
250
213.0
367.0
191.0
367.0
55.0
38.0
2500
Pack Materials-Page 2
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