SM3320-BATT-EV-NOPB Datasheet, PDF (2/21 Pages) Texas Instruments – AN-2121 SolarMagic™ SM3320-BATT-EV Charge Controller Reference Design

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6 Switch Nodes in Buck Mode............................................................................................... 5
7 Boost Gate Drive Signals From SM72442............................................................................... 6
8 Switch Nodes in Boost Mode.............................................................................................. 6
9 Start-Up Boost Circuitry .................................................................................................... 7
10 Start-up Circuit Timing Diagram........................................................................................... 8
11 Start-up V_Panel < V_Batt......................................................................................................... 8
12 Start-up Detail of Battery Current ......................................................................................... 8
13 Charging Waveforms During Float ....................................................................................... 9
14 Battery Charging with V_Panel < V_Battery (Boost) ........................................................................... 10
15 Battery Charging with V_Panel > V_Battery (Buck) ............................................................................ 10
16 Basic Operational Flowchart ............................................................................................. 12
17 Microcontroller Code Flowchart.......................................................................................... 13
18 Microcontroller Code Block Diagram.................................................................................... 15
19 Li-ion Charge Profile ...................................................................................................... 16
20 Charge Controller System Schematic, Part 1.......................................................................... 19
21 Charge Controller System Schematic, Part 2.......................................................................... 20
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AN-2121 SolarMagic™ SM3320-BATT-EV Charge Controller Reference
SNOSB76C – December 2010 – Revised May 2013
Design
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