Switch-Mode Power Supply


Posted on Feb 5, 2014

National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years. The application of these devices is normally straightforward, helped by the excellent documentation that is available. A typical example of a switch-mode power supply is that based on the LM2671 or LM2674. The components for it are ava


Switch-Mode Power Supply
Click here to download the full size of the above Circuit.

ilable for outputs of 3. 3 V, 5 V and 12 V. There is also a version providing a presettable output voltage. Within the specified application, the supplies can deliver currents of up to 500 mA. Note-worthy is the high switching frequency of 260 kHz. This has the advantage that only low-value inductor and capacitors are needed, and this results in excellent efficiency and small dimensions. In normal circumstances, the efficiency is 90% and may even go up to 96%. Both ICs provide protection against current and temperature overloads. The LM2671 has a number of additional facilities such as soft start and the option to work with an external clock. The latter enables several supplies to be synchronized so as to give better control of any EMC (ElectroMagnetic Compatibility). The application shown in the diagram provides an output voltage of 5 V and an output current of up to 500 mA. Diode D1 is a Schottky type (Uco‰¥ 45 V and Imax‰¥ 3 A).




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    10 LEDs VU meter
    Wide Basic for ATtiny2313
    digital counter circuits
    electronic toggle switch no1
    Ht48f06e Hopping Decoder
    charge monitor for 12V car battery circuit diagram
    Discrete Voltage Inverter
    555 Simple circuit diagram of the timing of time



    Top