This reference design uses natural-input current-limit characteristics of the flyback topology. During start-up, even though the initial output voltage of the super CAP is zero, the primary winding current is always limited by the peak-switch current limit of TPS61087. Considering the duty cycle during soft-start, the input current will be lower than the peak-switch current-limit value of TPS61087 by nature. Therefore, no extra components are needed.
The primary winding and secondary winding share the same ground, so the flyback inductor does not need reinforced insulation. Basic insulation is enough. This is a compact design for the super-CAP charge-up circuit application.
| Output voltage options | PMP15044.1 |
|---|---|
| Vin (Min) (V) | 2.5 |
| Vin (Max) (V) | 6 |
| Vout (Nom) (V) | 13.5 |
| Iout (Max) (A) | .4 |
| Output Power (W) | 5.4 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | 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
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
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | PMP15044 Test Results | Apr. 13, 2018 |
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