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UM0584 Datasheet(PDF) 3 Page - STMicroelectronics |
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UM0584 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 9 page UM0584 Demonstration board description Doc ID 14974 Rev 1 3/9 1 Demonstration board description The STEVAL-ISA031V1 demonstration board is based on a quasi resonant flyback converter and employs the STW4N150 power MOSFET as the primary switch. The STW4N150 is a 5 Ω 1500 V power MOSFET designed with STMicroelectronics’ proprietary high voltage "Mesh Overlay" technology, which gives the switch very low RDS(on) per area, low gate charge and high switching performance. The STW4N150 device is available in the TO-220, TO-247 and TO-220FH packages. The main specifications of the demonstration board are provided in table below. The input section features two connectors: CON1 for 400 Vac input voltage and CON2 for 230 Vac input voltage. The output voltages are available on CON3, with a shared ground between the two outputs. The converter is controlled by the L6565, a primary controller for quasi resonant ZVS (zero voltage switching) flyback converters. The IC controls the power capability variations with the mains voltage by means of line voltage feed-forward. In addition to the very low startup and quiescent currents, the device manages light load conditions with optimized consumption thanks to a special function which automatically lowers the operating frequency while maintaining operation as close to ZVS as possible. The IC also includes a disable function, an on-chip filter on current sense, an error amplifier with a precise reference voltage for primary regulation and effective two-level overcurrent protection. The transformer reflected voltage is set to 400 V, providing sufficient margin for the leakage inductance voltage spike, and a small RCD clamper circuit is used to limit excess voltage on the drain of the MOSFET. During normal operation, the IC is powered by the auxiliary winding of the transformer via diode D7. A spike killer circuit for auxiliary voltage fluctuations is provided but not connected (Q11, C13, R13). The primary current is measured using external sensing resistors (R20, R21) for current mode operation. Output voltage regulation is performed via a secondary feedback on the 24 V output. The feedback network consists of a programmable voltage reference, TL431, driving an optocoupler which ensures the required insulation between the primary and secondary sections. The optotransistor drives the feedback pin (COMP) which controls the operation of the IC. Table 1. STEVAL-ISA031V1 main specifications Parameter Value Input voltage range 185 to 460 Vac Input frequency range 50/60 Hz Output 1 24 V @ 1.7 A Output 2 5 V @ 1 A Output power 40 W Safety EN60950 EMI EN55014 |
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