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SM72445 Datasheet Preview

SM72445 Datasheet

Programmable Maximum Power Point Tracking Controller

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SM72445
www.ti.com
SNVS795 – MARCH 2012
SM72445 Programmable Maximum Power Point Tracking Controller With Adjustable PWM
Frequency
Check for Samples: SM72445
FEATURES
1
2 Renewable Energy Grade
• 110kHz,135kHz or 215kHz PWM Operating
Frequency
• Panel Mode Pin for Optional Bypass Switch
Control
• Programmable Maximum Power Point Tracking
• Photovoltaic Solar Panel Voltage and Current
Diagnostic
• Single Inductor Four Switch Buck-Boost
Converter Control
• I2C Interface for Communication
• Output Overvoltage Protection
• Over-Current Protection
PACKAGE
• TSSOP-28
DESCRIPTION
The SM72445 is a programmable MPPT controller
capable of controlling four PWM gate drive signals for
a 4-switch buck-boost converter. The SM72445 also
features a proprietary algorithm called Panel Mode
(PM) which allows for the panel to be connected
directly to the output of the power optimizer circuit
when the input to output voltage ratio is close to 1.
This provides an opportunity to optimize the efficiency
of the power optimizer when the load is naturally
matching the maximum power point of the panel.
Along with the SM72295 (Photovoltaic Full Bridge
Driver), it creates a solution for an MPPT configured
DC-DC converter with efficiencies up to 99.5% (when
operating with dedicated PM switches). Integrated
into the chip is an 8-channel, 10 bit A/D converter
used to sense input and output voltages and currents,
as well as IC configuration. Externally programmable
values include maximum output voltage and current
as well as different settings for slew rate, soft-start
and Panel Mode.
BLOCK DIAGRAM
VDDA
VDDD
AVIN
AIIN
AVOUT
AIOUT
A0
A2
A4
A6
AIN0
AIN1
AIN2
AIN3
ADC
AIN4
AIN5
AIN6
AIN7
D0 Vin
D1 Iin
MPPT CONTROLLER
CS_N
SCLK
DIN
DOUT
ADC
CONTROLLER
ADC_C
CLK GEN
D2
Vout
D3
Iout
D4
I2C
D5
D6
D7
HIB
LIB
HIA
LIA
SCL
SDA
I2C0
I2C1
I2C2
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 © 2012, Texas Instruments Incorporated




etcTI

SM72445 Datasheet Preview

SM72445 Datasheet

Programmable Maximum Power Point Tracking Controller

No Preview Available !

SM72445
SNVS795 – MARCH 2012
www.ti.com
PV(+)
Rsen_in
PM DRIVER
Vo
Current Sensing Amplifier
Gate 2
R
5V
RT1
PV(-) 0.01 PF
R
RT2
RT3
RT4
nF
1 nF
RB1
1 nF
1 nF
RB2
RB3
RB4
CONFIGURATION RESISTOR
PM DRIVER
0.01 PF
5V
2.2 PF
49.9:
VDDA
VDDD
AVIN
AIIN
NC3
NC1
AIOUT
A0
HIB
A2
LIB
A4
HIA
A6
LIA
5V
10k
SM72445
NC2
2k
SCL
2k
SDA
10k I2C0
10k I2C1
10k I2C2
NC4
RST
PM
AVOUT
PM_OUT
VSSA
VSSD
0.01 PF
2.2 PF
Gate 1
Current Sensing Amplifier
Current Sensing Amplifier
5V
60.4k
10k
10k
PWM4
PWM3
PWM2
PWM1
RFB1
RFB2
H-Bridge Driver
Figure 2. Typical Application Circuit
CONNECTION DIAGRAM
1
RST
2
NC1
3 VDDD
4 VSSD
5 NC2
6 I2C0
7 I2C1
8 SCL
9 SDA
10 NC3
11 PM_OUT
12
VDDA
13 VSSA
14 A0
SM72445
28
PM
LIA 27
HIA 26
HIB 25
LIB 24
NC4 23
I2C2 22
AIOUT 21
A6 20
AIIN 19
A4 18
AVOUT 17
A2 16
AVIN 15
Figure 3. Top View - TSSOP-28
Gate 4
Vo
Rsen_out
Gate 3
Current sensing Amplifier
Gate 4
Gate 3
Gate 2
Gate 1
2
Submit Documentation Feedback
Product Folder Links: SM72445
Copyright © 2012, Texas Instruments Incorporated



Part Number SM72445
Description Programmable Maximum Power Point Tracking Controller
Maker etcTI
Total Page 3 Pages
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SM72445 Datasheet PDF





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