This bidirectional flyback reference design can handle bus voltages of 18V to 36V and single cell battery of 3V to 4.2V. The charge current is limited to 5A. While in the charging state, the bus voltage can input 18V to 36V and output up to 4.2A at 5A charge current. There are external constant current and constant voltage (CC/CV) loops on the battery side to maintain that the battery gets properly charged to the battery voltage. In discharge mode, the single cell battery (3V to 4.2V) becomes the input and outputs 27.5V on the Vbus. The input current from the battery is limited to 5A using a separate external CC loop. The bus voltage output side also has a CV loop that verifies that the bus voltage is regulated to 27.5Vout.
| Output voltage options | PMP23580.1 | PMP23580.2 |
|---|---|---|
| Vin (Min) (V) | 18 | 3 |
| Vin (Max) (V) | 36 | 4.2 |
| Vout (Nom) (V) | 4.2 | 27.5 |
| Iout (Max) (A) | 5 | .75 |
| Output Power (W) | 21 | 20.625 |
| Isolated/Non-Isolated | Isolated | Isolated |
| Input Type | DC | DC |
| Topology | Flyback- Non Sync | Flyback- Non Sync |
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
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Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | Bidirectional Flyback for Active Cell Balancing Reference Design | PDF | HTML | Jul 21, 2025 |
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