Part # Brief STEVAL-ISA001V1 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: 6W dual output supply evaluation board using VIPer12A


Part Details:

STEVAL-ISA001V1 6W dual output supply evaluation board using VIPer12A Data Brief Features Switch mode general purpose power supply Input: 85 to 264 VAC @ 50/60 Hz Output: 12V @ 0.5A Output power (peak) 6W Burst mode operation in standby for blue angel operation Current mode control Switching frequency 60 kHz Over 74% efficiency STEVAL-ISA001V1 Auxiliary undervoltage lockout with hysteresis Output short circuit protection Description Thermal shutdown protection Meets EN55022 Class B EMI specification The evaluation board consumes less than 1W total power consumption when working in the burst mode during standby operation and Applications therefore, meets Blue Angel norm. Table 2 below outlines the total power consumption measured This evaluation board is an off-line wide range on the reference board at different line voltages dual output general-purpose power supply with zero loads at both the outputs. The output capable of delivering a total output power up to voltages remain regulated when operating in burst 6W. In low load condition, it operates in the mode condition. automatic burst mode while in an overvoltage condition it will operate in hiccup mode. Other output voltages can easily be achieved by changing the transformer and a few components on the board, as shown in the application note. Transformers are readily available for the following configurations: 5V/12V 5V/15V 5V/24V July 2007 Rev 1 1/5 For further information contact your local STMicroelectronics sales office. www.st.com 5 General circuit description STEVAL-ISA001V1 1 General circuit description The circuit operates from 85Vac to 264Vac input voltage with an output power peak of 6W through two output voltages of 5Vdc and 12Vdc. It contains an input fuse (F2), EMI filtering (C1, L1, and C2), and the secondary regulation is provided by U2 and U3, the optocoupler and TL431 respectively. For output filtering, the components used are the output capacitors C8 and C10. These two output capacitors are sized according to the ripple current and ripple voltage specifications. The two specifications determine the ESR and RMS current capabilities of the capacitors used. An additional LC (PI) filter is added to the 5Vdc output, C9-L2 configuration, for further effective ripple and noise rejection. The AC input is rectified and filtered by the bridge BR1 and the bulk capacitor C1 to generate the high voltage DC bus applied to the primary winding of the transformer, T1. The 5Vdc output is sensed with an optocoupler. It is possible to modify the output voltages by changing the transformer turns ratio and modifying the resistance values of R7 and R8 in the feedback loop. R2 and C4 form the snubber circuit needed to reduce the voltage ringing on the drain pin and the leakage spikes. 2/5 STEVAL-ISA001V1 Board schematic 2 Board schematic Figure 1.


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Brief STEVAL-ISA001V1.pdf Datasheet