The anti exciting type switching power supply based on FSDM0565R is designed


Posted on Feb 7, 2014    8588

At present, the switching power supply is with its high performance, high efficiency 75%, the switching power supply efficiency of the single scale integration has already been more than 90% now, This pair solves the energy problem and plays a role in adding fuel to the flames, the Piower supply of a lot of energy-conserving electric apparatuses h


The anti exciting type switching power supply based on FSDM0565R is designed
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as already been replaced by the switching power supply; This text has introduced a kind of three phases inputting, anti exciting type stabilized voltage supply of switch of multi-output based on chip FSDM0565R of switching power supply. Have analyzed characteristic and operating principle of FSDM0565R, and provide its design circuit diagram, calculation of actual parameter and the choosing of the device, provide surveying the waveform and testing the technical indicator of this power module finally. Experimental result show, utilize switching power supply of chip design this have with high efficiency, the intersection of volume and little, the intersection of circuit and simple, the intersection of input voltage and the intersection of excursion and wide, the intersection of ripple and characteristic such as being little. Solve the problem that industry`s on-the-spot three phases input at the same time, have actual value to popularize. FSDM0565R is that the one piece switching power supply that Fairchild semiconductor produces designs the chip, it is shut off protective circuit, trouble protective circuit and other controlling circuit to integrate in a one piece device by PWM control device, Shaker, heat. Because own power consumption of the chip is very low, power efficiency is achievable about 80%. The concrete characteristic is as follows: A, firm internal avalanche value SenseFET; B, first intermittent for work pattern 240VAC 1W and consumption at the time of 0. 5W ; C, rigorous fixed operating frequency: 66KHz; D, internal starting circuit, improved electric current restriction, excess voltage protection OVP, overload protection OLP, the internal heat shuts off the function TSD, unusual overcurrent protection AOCP, restart the mode automatically, Under Voltage Lock Out UVLO When. FSDM0565R mainly includes several following parts: 1Start: During start, offered the internal bias voltage in the internal high-voltage current source, and in order to connect the external electric capacity CVCC of Vcc foot Charge. When Vcc reaches 12V, FPSTM begins on off action, the internal high-voltage current source disappears at this moment. 2Feedback control: The feedback control of switching power supply has voltage control and way of current control two, FSDM0565R adopts the control mode of current feedback. By a photosensitive resister such as H11A817A And a partial pressure trimmer such as KA431 Make up a typical FB network. May present the situation with wrong ripple when it is debugged in the circuit ripple that here need emphasizing, this because feedback loop problematic probably, in need of measuring the feedback loop waveform it compares photosensitive resister with to be unanimous in bilateral frequency at the checking circuit at this moment. I choose the low-cost photosensitive resister of low speed NEC2501-1 during design on the issue that because of the cost, It is not enough to design the index to cause output frequency. So select to select through the way that want according to the frequency of switching power supply at the time of the photosensitive resister. 3 Protective circuit: Have integrated the circuit of a lot of self-protection functions such as overload protection OLP within FSDM0565R, Overcurrent protection AOCP, Excess voltage protection OVP And the excessive heating is shut off TSD. The concrete index sees the techincal brochure of this chip. 4Soft turn on: Integrate the soft starting circuit within FSDM0565R, when the circuit is started, increase the electric current of reverse input voltage and FET of PW

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