SM72445 Datasheet, PDF (1/19 Pages) Texas Instruments – Programmable Maximum Power Point Tracking Controller With Adjustable PWM Frequency

SM72445
March 7, 2012
Programmable Maximum Power Point Tracking Controller
With Adjustable PWM Frequency
General 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 (Photo-
voltaic 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 config-
uration. Externally programmable values include maximum
output voltage and current as well as different settings for slew
rate, soft-start and Panel Mode.
Features
■ ^{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
Block Diagram
FIGURE 1. Block Diagram
© 2012 Texas Instruments Incorporated 301761 SNVS795
30176102
www.ti.com