LINEAR TECHNOLOGY DC1817B Evaluation Board, Flyback Converter for Isolated No Opt-Coupler Flyback Controller with PFC
The demonstration board is an off line isolated flyback converter featuring LT3798EMSE device. The LT3798EMSE is a constant voltage/constant current isolated flyback controller that combines active power factor correction PFC with no optocoupler required for output voltage feedback into a single stage converter. A LT3798EMSE based design can achieve a power factor of greater than 0.97 by actively modulating the input current, allowing compliance with most harmonic current emission requirements. The demo board provides a single constant voltage output of 24V at 2A. It is optimized to operate over a wide AC input voltage range 90VAC to 265VAC, 47Hz to 63Hz. Output voltage accuracy stays within ±5% over the whole input voltage and load range. It provides a high power factor >0.95 enabling the design to be used worldwide. It is also designed to comply with the IEC 61000-3-2 class D harmonics standard and the EN55015B conducted EMI standard.
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- 87% efficiency
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- Isolated PFC flyback with minimum number of external components
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- VIN and VOUT limited only by external components
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- Active power factor correction
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- Low harmonic distortion
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- No optocoupler required
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- Constant current and constant voltage regulation
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- Accurate regulated voltage and current ±5% typical
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- Energy star compliant less than 0.5W no load operation
High voltages are present on demo circuit and can lead to lethal injuries to human body. only qualified personnel should operate it.
Improper components replacement on the demo circuit can cause performance deteriorations, circuit malfunction, property damage and even life threatening injuries.