This reference design shows the use of a buck-boost capability of a single-ended primary-inductor converter (SEPIC). Since the input and output are separated by a capacitor, this topology can be used to charge a battery with variable VIN as well as variable VOUT. A synchronous peak-current mode controller LM5122 is used; this IC can drive the high-side sync-FET by means of level shift (RCD network). By applying 9V to 36V input, this board can be used to charge two batteries in series with a voltage range of 8V to 28V, up to 2A charging current, or used as standard constant-voltage power supply. Both setpoints of output voltage and current are defined by two trimmers, even though both references can also be replaced by using two digital-to-analog converters.
| Output voltage options | PMP31144.1 |
|---|---|
| Vin (Min) (V) | 9 |
| Vin (Max) (V) | 36 |
| Vout (Nom) (V) | 24 |
| Iout (Max) (A) | 2 |
| Output Power (W) | 48 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | Sepic- CCM^Sepic- Synchronous |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Test results for the reference design, including efficiency graphs, test prerequisites and more
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
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Design file that contains information on physical board layer of design PCB
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Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | SEPIC Reference Design Fitting for Battery Chargers | PDF | HTML | Dec. 13, 2023 |
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