Datasheet

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ADC

CONTROLLER

MPPT CONTROLLER

I2C

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

CS_N

SCLK

DIN

DOUT

Vin

Iin

Vout

Iout

CLK GEN

SDA

SCL

LIA

HIA

LIB

HIB

ADC_C

VDDA

VSSA

VDDD

VSSD

AVIN

AIIN

AVOUT

AIOUT

I2C0

I2C1

I2C2

SM72442

www.ti.com

SNVS689H –OCTOBER 2010–REVISED APRIL 2013

Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels

Check for Samples: SM72442

FEATURES

DESCRIPTION

The SM72442 is a programmable MPPT controller

• Renewable Energy Grade

capable of controlling four PWM gate drive signals for

• Programmable Maximum Power Point Tracking

a 4-switch buck-boost converter. The SM72442 also

• Photovoltaic Solar Panel Voltage and Current

features a proprietary algorithm called Panel Mode

Diagnostic

which allows for the panel to be connected directly to

the output of your power optimizer circuit. Along with

• Single Inductor Four Switch Buck-Boost

the SM72295 (Photovoltaic Full Bridge Driver), it

Converter Control

creates a solution for an MPPT configured DC-DC

• I2C Interface for Communication

converter with efficiencies up to 99.5%. Integrated

• VOUT Overvoltage Protection

into the chip is an 8-channel, 12 bit A/D converter

used to sense input and output voltages and currents,

• Over-Current Protection

as well as board configuration. Externally

• Package: TSSOP-28

programmable values include maximum output

voltage and current as well as different settings

forslew rate, soft-start and Panel Mode.

Block Diagram

Figure 1. Block Diagram

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

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.

Summary of content (21 pages)

PAGE 1
SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Programmable Maximum Power Point Tracking Controller for Photovoltaic Solar Panels Check for Samples: SM72442 FEATURES 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 circuit.
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SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 PV(+) www.ti.com Vout(+) PM DRIVER Rsen_in Gate 2 Current Sensing Amplifier Gate 4 Vout(-) R 5V 0.01 PF PV(-) 2.2 PF 2.2 PF 5V VDDA VDDD AIIN Current Sensing Amplifier AIOUT Current Sensing Amplifier AVIN RT1 RT2 RT3 NC3 RT4 NC1 0.1 PF 0.1 PF 0.1 PF 0.1 PF RB2 RB3 RB4 10k 2k 2k 10k CONFIGURATION RESISTOR 10k 10k NC2 HIB LIB HIA H-Bridge Driver PWM1 SM72442 Gate 2 Gate 1 5V 60.
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SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 PIN DESCRIPTIONS Pin Name Description 1 RST Active low signal. External reset input signal to the digital circuit. 2 NC1 Reserved for test only. This pin should be grounded. 3 VDDD Digital supply voltage. This pin should be connected to a 5V supply, and bypassed to VSSD with a 0.1 µF monolithic ceramic capacitor. 4 VSSD Digital ground. The ground return for the digital supply and signals. 5 NC2 No Connect.
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SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Absolute Maximum Ratings www.ti.com (1) Analog Supply Voltage VA (VDDA - VSSA) -0.3 to 6.0V Digital Supply Voltage VD (VDDD - VSSD) -0.3 to VA +0.3V max 6.0V Voltage on Any Pin to GND -0.3 to VA +0.
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SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Electrical Characteristics Specifications in standard typeface are for TJ = 25°C, and those in boldface type apply over the full operating junction temperature range (1) Parameter Test Conditions Min Typ Max Units - 0 to VA - V ANALOG INPUT CHARACTERISTICS AVin, AIin AVout, AIout Input Range IDCL DC Leakage Current CINA Input Capacitance (2) - - ±1 µA Track Mode - 33 - pF Hold Mode - 3 - pF - 0.
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SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.
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SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Operation Description OVERVIEW The SM72442 is a programmable MPPT controller capable of outputting four PWM gate drive signals for a 4switch buck-boost converter with an independent Panel Mode. The typical application circuit is shown in Figure 2. The SM72442 uses an advanced digital controller to generate its PWM signals.
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SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.com STARTUP SM72442 has a soft start feature that will ramp its output voltage for a fixed time of 250ms. If no 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). During these 60 seconds, any variation on the output power will not cause the chip to enter MPPT mode.
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SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Different conditions to enter and exit Panel Mode can be set on the ADC input channel 2. Listed below are different conditions that a user can select on pin A2. “1:1” refers to the state in which the DC/DC converter operates with its output voltage equal to its input voltage (also referred to as “Buck-Boost” mode in Figure 4.) A2 Entering Panel Mode Exiting Panel Mode 4.69 V 2s in 1:1 Mode 3.1% power variation 4.06 V 1s in 1:1 Mode 3.
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SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.com Fast 40V No Slew Slow 'V = 10V 30V 20 ± 40 ms (Frequency dependent) 600 ms 1200 ms Figure 6. Slew Rate Limitation Circuit 10 V OUT _A OUT_ B SM72482 VC C SM72442 P M Pulse High 0.47 PF 400 kHz Square Wave IN _A IN_ B PM_O UT 499 10k 150 pF VE E VOUT (+) PV (+) 10k 499 0.47 PF 2.0 0k Figure 7.
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SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 ANALOG INPUT An equivalent circuit for one of the ADC input channels is shown in Figure 9. Diode D1 and D2 provide ESD protection for the analog inputs. The operating range for the analog inputs is 0V to VA. Going beyond this range will cause the ESD diodes to conduct and result in erratic operation. The capacitor C1 in Figure 9 has a typical value of 3 pF and is mainly the package pin capacitance.
PAGE 12
SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.com Table 2. reg1 Register Description Bits Field Reset Value R/W Bit Field Description 55:41 RSVD 15'h0 R Reserved for future use. 40 mppt_ok 1'h0 R Internal mppt_start signal (test only) 39:30 Vout 10'h0 R Voltage out 29:20 Iout 10'h0 R Current out 19:10 Vin 10'h0 R Voltage in 9:0 Iin 10'h0 R Current in Table 3.
PAGE 13
SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Using the I2C port, the user will be able to control the duty cycle of the PWM signal. Input and output voltage and current offset can also be controlled using I2C on register 4. Control registers are available for additional flexibility. The thresholds iin_hi_th, iin_lo_th, iout_hi_th, iout_lo_th, in reg5 are compared to the values read in by the ADC on the AIIN and AIOUT pins.
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SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.
PAGE 15
SM72442 www.ti.com SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 Noise coupling into digital lines greater than 400 mVp-p (typical hysteresis) and undershoot less than 500 mV GND, may prevent successful I2C communication with SM72442.
PAGE 16
SM72442 SNVS689H – OCTOBER 2010 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision G (April 2013) to Revision H • 16 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant SM72442MTE/NOPB TSSOP PW 28 250 178.0 16.4 6.8 10.2 1.6 8.0 16.0 Q1 SM72442MTX/NOPB TSSOP PW 28 2500 330.0 16.4 6.8 10.2 1.6 8.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SM72442MTE/NOPB TSSOP PW SM72442MTX/NOPB TSSOP PW 28 250 213.0 191.0 55.0 28 2500 367.0 367.0 38.
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