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SM3320-BATT-EV-NOPB Fiches technique(PDF) 9 Page - Texas Instruments |
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SM3320-BATT-EV-NOPB Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 21 page Vsetpoint = Reg3[29:20] 1024 x VDDA x R51 + R52 + R53 R53 www.ti.com Output Current Regulation 10 Output Current Regulation Current regulation is enforced by a comparator (U11A). The current setting can be switched from a low current limit to a high current limit with a bit set by the microcontroller. When microcontroller pin RC5 (pin number 16) is set to high impedance, the high current limit is set. When pin RC5 is set to 0V, the low current limit is set. In this design, the high current limit is set to 9A and the low current limit to 0.5A. 11 Voltage Regulation Voltage regulation with the SM72442 is performed internally. The initial output voltage setting is set through pin A0 (0-5V). The output voltage set point can then be changed through the I2C communication interface by setting the register 0x03 bits 20:29 to the required voltage set point and bit 46 to 1. Figure 13 shows the system performing voltage regulation on the battery at 13.5V. In addition to the voltage regulation, a comparator (U11B) will reset the SM72442 and cause the DC/DC converter to shutdown if the output voltage increases beyond the values set by R71 and R72. When the negative input of the comparator reaches over 5V, the SM72442 controller will be reset. The default value corresponds to 14.6V battery voltage. (1) Figure 13. Charging Waveforms During Float 9 SNOSB76C – December 2010 – Revised May 2013 AN-2121 SolarMagic™ SM3320-BATT-EV Charge Controller Reference Design Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated |
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