SM72445_15 Datasheet, PDF (1/20 Pages) Texas Instruments – SM72445 Programmable Maximum Power Point Tracking Controller With Adjustable PWM Frequency

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
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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