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SM72442 Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels
May 12, 2011
SM72442 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 buckboost 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 circuit. 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%. 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 configuration. Externally programmable values include maximum output voltage and current as well as different settings forslew rate, soft-start and Panel Mode.
Features
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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
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FIGURE 1. Block Diagram
© 2011 National Semiconductor Corporation
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SM72442
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FIGURE 2. Typical Application Circuit
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SM72442
Connection Diagram
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FIGURE 3. Top View TSSOP-28
Ordering Information
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Order Number SM72442MTX SM72442MTE SM72442MT
Description TSSOP-28 TSSOP-28 TSSOP-28
NSC Package Drawing MTC28 MTC28 MTC28
Supplied As 2500 Units in Tape and Reel 250 Units in Tape and Reel 48 Units in Rail
Package Top Marking SO2442 SO2442 SO2442
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SM72442
Pin Descriptions
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Name RST NC1 VDDD VSSD NC2 I2C0 I2C1 SCL SDA NC3 Description Active low signal. External reset input signal to the digital circuit. Reserved for test only. This pin should be grounded. Digital supply voltage. This pin should be connected to a 5V supply, and bypassed to VSSD with a 0.1 µF monolithic ceramic capacitor. Digital ground. The ground return for the digital supply and signals. No Connect. This pin should be pulled up to the 5V supply using 10k resistor. Addressing for I2C communication. Addressing for I2C communication. I2C clock. I2C data. Reserved for test only. This pin should be grounded.
PM_OUT When Panel Mode is active, this pin will output a 400 kHz square wave signal with amplitude of 5V. Otherwise, it stays low. VDDA VSSA A0 AVIN A2 AVOUT A4 AIIN A6 AIOUT I2C2 NC4 LIB HIB HIA LIA PM Analog supply voltage. This voltage is also used as th.