NCL30125 Designing a Two-Switch Forward Board APPLICATION NOTE
●Most of the current solutions are using a pulse transformer to drive the floating high side MOSFET. The cost and the space of this component are not negligible. For this reason, the NCL30125 integrates both low side and high side driver with the bootstrap technique in order to generate the voltage supply needed for the high side driver. This technique is normally used in half−bridge application. Indeed, compared to the two−switch forward topology, the low side driver is turned on in opposition compared to the high side driver. This operation is useful to refresh the bootstrap capacitor but the two−switch forward topology is less friendly. To be able to use the bootstrap technique, an external switch is added to refresh the capacitor. The current capability of this additional switch is adjusted to handle the magnetization current during the off time. Please note that the freewheel diode connected between the HB node and the ground is not needed anymore.
●The NCL30125 also contains all the necessary functions usually embedded in today modern power supply designs. The controller’s features include a current mode operation up to 1 MHz, a high voltage start−up current source with dynamic self−supply (DSS), brown−out detection, adjustable soft−start and dedicated OVP/OTP input. The NCL30125 is available on SOIC16 package.
●This application note focuses on the design of an adapter driven by the NCL30125. The equations developed are further used to build a 300−W adapter.
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[ high output power combined with low output voltage application ][ half−bridge application ] |
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Application note & Design Guide |
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Please see the document for details |
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SOIC16 |
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English Chinese Chinese and English Japanese |
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October, 2019 |
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Rev. 0 |
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AND9960/D |
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265 KB |
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