SM72445

Manufacturer Part NumberSM72445
ManufacturerTexas Instruments
SM72445 datasheet
 


Specifications of SM72445

Switching Frequency(max)(khz)215Regulated Outputs(#)1
Vin(min)(v)5Vin(max)(v)500
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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.
Block Diagram
© 2012 Texas Instruments Incorporated
SM72445
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
FIGURE 1. Block Diagram
301761 SNVS795
March 7, 2012
30176102
www.ti.com

SM72445 Summary of contents

  • Page 1

    ... 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 ...

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    www.ti.com 2 ...

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    ... Order Number Description SM72445MTX TSSOP-28 SM72445MTE TSSOP-28 SM72445MT TSSOP-28 30176103 FIGURE 3. Top View TSSOP-28 NSC Package Drawing Supplied As 2500 Units in Tape and MTC28 Reel 250 Units in Tape and MTC28 Reel MTC28 48 Units in Rail 3 Package Top Marking SM72445 SM72445 SM72445 www.ti.com ...

  • Page 4

    Pin Descriptions Pin Name 1 RST Active low signal. External reset input signal to the digital circuit. 2 NC1 Reserved for test only. This pin should be grounded. Digital supply voltage. This pin should be connected supply, ...

  • 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

    ... Note 4: Not tested. Guaranteed by design. Typical Performance Characteristics Typical performance curves reflect the performance of the SM72445 as designed into the SM3320–1A1 reference design, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: T Typical Efficiency, Vmp 33V Peak Efficiency vs Temperature www ...

  • Page 7

    ... Operation Description OVERVIEW The SM72445 is a programmable MPPT controller capable of outputting four PWM gate drive signals for a 4 switch buck- boost converter with an independent Panel Mode. The typical application circuit is shown in Figure 2. The SM72445 does not require a dedicated switch to implement Panel Mode. The four buck-boost switches can be controlled to implement PM ...

  • Page 8

    ... If over-voltage protection needs to be implemented, it must be done using external components. For exampe, a voltage comparator with its out- www.ti.com put connected to the reset pin of the SM72445 is one possible implementation. The maximum output voltage is always enforced during MPPT operation of the IC. ...

  • Page 9

    ... HIA and LOA and between HIB and LOB will be 55ns. PANEL MODE PIN (PM) The SM72445 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 Panel Mode ...

  • Page 10

    FIGURE 7. Sample Application for Panel Mode Operation RESET PIN When the reset pin is pulled low, the chip will cease its normal operation and turn-off all of its PWM outputs including the output of PM_OUT pin. Below is an ...

  • Page 11

    ... The choice of resistor value depends on many system factors such as load capacitance and trace length. A typical value of pull-up resistor for SM72445 ranges from 2 kΩ kΩ. For 30176109 more information, refer to the I2C Bus specification for se- lecting the pull-up resistor value ...

  • Page 12

    Register Description Bits Field 55:40 RSVD 39:30 ADC6 29:20 ADC4 19:10 ADC2 9:0 ADC0 reg1 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 ...

  • Page 13

    ... I2C0, I2C1 and I2C2 pins. Three device address pins allow connection SM72445s to the same I2C master. A pull-up resistor (10kΩ supply is used to set a bit 1 on the device address. Device addressing for slaves are as follows: ...

  • Page 14

    ... The data registers in the SM72445 are selected by the Com- mand Register. The Command Register is offset from base address 0xE0. Each data register in the SM72445 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 15

    ... Noise coupling into digital lines greater than 400 mVp-p (typ- ical hysteresis) and undershoot less than 500 mV below GND, may prevent successful I2C communication with SM72445. I2C no acknowledge is the most common symptom, causing unnecessary traffic on the bus. Although the I2C maximum ...

  • Page 16

    Physical Dimensions www.ti.com NS Package Drawing MTC28 16 30176150 ...

  • Page 17

    Notes 17 www.ti.com ...

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    Notes ...

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    ... 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’ ...