SM72442MTX/NOPB

Manufacturer Part NumberSM72442MTX/NOPB
DescriptionPV DMPPT Controller - Solar
ManufacturerNational Semiconductor
SeriesSolarMagic™
SM72442MTX/NOPB datasheet
 


Specifications of SM72442MTX/NOPB

ApplicationsController, Photovoltaic Solar PanelsVoltage - Input4.75 V ~ 5.25 V
Number Of Outputs1Voltage - Output-
Operating Temperature-40°C ~ 105°CMounting TypeSurface Mount
Package / Case28-TSSOP (0.173", 4.40mm Width)Lead Free Status / Rohs StatusLead free / RoHS Compliant
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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
© 2011 National Semiconductor Corporation
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
May 12, 2011
30134302
www.national.com

SM72442MTX/NOPB Summary of contents

  • Page 1

    ... Externally programmable values include maximum output voltage and current as well as different settings forslew rate, soft-start and Panel Mode. Block Diagram © 2011 National Semiconductor Corporation SM72442 Features ■ Renewable Energy Grade ■ ...

  • Page 2

    www.national.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 ...

  • Page 4

    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 ...

  • Page 5

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor 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

    Operation Description OVERVIEW The SM72442 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 The SM72442 uses ...

  • 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. ...

  • Page 8

    PARAMETER DEFINITIONS Output Voltage Slew Rate Limit Settling Time: Time con- stant of the internal filter used to limit output voltage change. For fast slew rate, every 1V increase, the output voltage will be held for 30 ms whereas in ...

  • Page 9

    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 oscilloscope capture of a forced reset condition. FIGURE ...

  • Page 10

    Register Description Bits Field 41 pt_n 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

    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 ...

  • 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 ...

  • Page 13

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

  • Page 14

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