SM72442

Manufacturer Part NumberSM72442
ManufacturerTexas Instruments
SM72442 datasheet
 


Specifications of SM72442

Switching Frequency(max)(khz)210Regulated Outputs(#)1
Vin(min)(v)4.75Vin(max)(v)5.25
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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 buck-
boost 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 cir-
cuit. Along with the SM72295 (Photovoltaic Full Bridge Driv-
er), 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 configu-
ration. Externally programmable values include maximum
output voltage and current as well as different settings forslew
rate, soft-start and Panel Mode.
Block Diagram
© 2012 Texas Instruments Incorporated
SM72442
Features
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
FIGURE 1. Block Diagram
301343 SNVS689G
March 13, 2012
30134302
www.ti.com

SM72442 Summary of contents

  • Page 1

    ... 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 buck- boost 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 cir- cuit ...

  • Page 2

    www.ti.com 2 ...

  • Page 3

    ... Connection Diagram Ordering Information Order Number Description SM72442MTX TSSOP-28 SM72442MTE TSSOP-28 SM72442MT TSSOP-28 30134303 FIGURE 3. Top View TSSOP-28 NSC Package Drawing Supplied As MTC28 2500 Units in Tape and Reel MTC28 250 Units in Tape and Reel MTC28 48 Units in Rail 3 Package Top Marking SO2442 ...

  • Page 4

    ... AIIN Input current sensing pin A/D Input Channel 6. Connect a resistor divider supply to set the output voltage slew rate and various PM configurations. Refer to configurable modes for SM72442 in the application section. 21 AIOUT Output current sensing pin. 22 I2C2 Addressing for I2C communication. ...

  • Page 5

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Analog Supply Voltage V A (VDDA - VSSA) Digital Supply Voltage V D (VDDD - VSSD) Voltage on Any Pin to GND Input Current at Any Pin (Note 3) ...

  • Page 6

    ... Panel Mode. The typical application circuit is shown in Figure The SM72442 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 www ...

  • Page 7

    ... STARTUP SM72442 has a soft start feature that will ramp its output volt- age for a fixed time of 250ms output current is detected during soft-start time, the chip will then be in Panel Mode for 60 seconds. A counter will start once the minimum output current threshold is met (set by ADC input channel 4) ...

  • Page 8

    ... FIGURE 7. Sample Application for Panel Mode Operation www.ti.com PANEL MODE PIN (PM) PIN The SM72442 can be forced into Panel Mode by pulling the PM pin low. One sample application is to connect this pin to the output of an external temperature sensor; therefore when- ever an over-temperature condition is detected the chip will enter a Panel Mode ...

  • Page 9

    ... Choice of resistor value depends on many system factors; load capacitance, trace length, etc. A typical value of pull- up resistor for SM72442 ranges from 2 kΩ kΩ. For more information, refer to the I2C Bus specification for selecting the pull-up resistor value . ...

  • Page 10

    Register Description Bits Field 55:41 RSVD 40 mppt_ok 39:30 Vout 29:20 Iout 19:10 Vin 9:0 Iin reg3 Register Description Bits Field 55:47 RSVD 46 overide_adcprog 45 RSVD 44:43 RSVD 42 power_thr_sel 41:40 bb_in_ptmode_s el 39:30 iout_max 29:20 vout_max 19:17 ...

  • Page 11

    ... The data registers in the SM72442 are selected by the Com- mand Register. The Command Register is offset from base address 0xE0. Each data register in the SM72442 falls into one of two types of user accessibility: 1) Read only (Reg0, Reg1) 2) Write/Read same address (Reg3, Reg4, Reg5) There are 7 bytes in each register (56 bits), and data must be read and written in blocks of 7 bytes ...

  • Page 12

    ... Noise coupling into digital lines greater than 400 mVp-p (typ- ical hysteresis) and undershoot less than 500 mV GND, may prevent successful I2C communication with SM72442. I2C no acknowledge is the most common symptom, causing unnec- essary traffic on the bus although the I2C maximum frequency ...

  • Page 13

    Physical Dimensions NS Package Drawing MTC28 13 30134350 www.ti.com ...

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    www.ti.com ...

  • Page 15

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...