This power reference design generates all voltages to supply a class-D audio amplifier. The main output voltage is 30V and delivers 200W continuously and 750W peak. The first stage is a power-factor corrected Boost. A Flyback converter supplies 12V on primary side as well as 12V@300mA and 3.3V@200mA on secondary side. A hardware switch + remote input let the converter enter in stand-by mode: in this status the 30V output is disabled while 12V, 3.3V are "always on". This way the stand-by power is reduced further. A second digital input switches the main output voltage from 30V to 18V, allowing low current consumption mode in case of the audio amplifier needs less power.
| Output voltage options | PMP30183.1 | PMP30183.2 | PMP30183.3 | PMP30183.4 |
|---|---|---|---|---|
| Vin (Min) (V) | 90 | 120 | 10 | 350 |
| Vin (Max) (V) | 264 | 430 | 14 | 430 |
| Vout (Nom) (V) | 400 | 12 | 3.3 | 30 |
| Iout (Max) (A) | .55 | .3 | .2 | 6.6 |
| Output Power (W) | 220 | 3.6 | .66 | 198 |
| Isolated/Non-Isolated | Non-Isolated | Isolated | Non-Isolated | Isolated |
| Input Type | AC | DC | DC | DC |
| Topology | Boost- PFC | Flyback- DCM | Buck- Synchronous | Forward- 2 Switch |
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
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | PMP30183 Test Results | Nov. 17, 2017 |
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