SM3320-BATT-EV-NOPB Datasheet, PDF (3/21 Pages) Texas Instruments – AN-2121 SolarMagic™ SM3320-BATT-EV Charge Controller Reference Design

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Charging Profile
1 Charging Profile
Figure 1 shows the lead-acid charging profile used in this reference design.
If the battery voltage is very low, a slow charge current is applied and limited until the voltage rises above
a pre-set threshold value Vt. The full charge current is then applied. Once full charge is detected on the
voltage of the battery, the system switches to a floating charge and maintains the battery voltage at a fixed
threshold. At any time, the system will run in MPPT mode if the available power is lower than the power
required to achieve voltage or current regulation.
Figure 1. Lead-Acid Charging Profile
2 Features
• 12V Lead Acid Battery
• Vin range = 15V to 45V Vmp (50V Voc)
• Max Input Current: Isc = 11A
• MPPT algorithm for optimized photovoltaic applications
• Up to 9A charging current
• Reverse current protection
• Trickle charge and fast charge mode
• Up to 98% converter efficiency
• 14.2V max charge voltage, 13.5V floating voltage
• Output voltage set-points can be re programmed
SNOSB76C – December 2010 – Revised May 2013
AN-2121 SolarMagic™ SM3320-BATT-EV Charge Controller Reference
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