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AN004 Datasheet(PDF) 1 Page - Analog Intergrations Corporation |
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AN004 Datasheet(HTML) 1 Page - Analog Intergrations Corporation |
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1 / 7 page  AN004 May 1997 1 Universal Step-Down DC/DC Converter Design Using AIC1563 Abstract Voltage required in the modern electronic systems are single or multiple regulated voltages such as 3.3 V, 5V, 12V, -5V, or –12V, etc. It can be supplied by using DC/DC converters. The operations of Step-Down DC/DC converter is introduced in the application note. A practical constant voltage, DC/DC step-down converter design based on the AIC1563 is also illustrated to help the readers in the circuit designs and applications. Operations of Step-Down DC/DC Converter Figure 1 shows a basic circuit configuration of step-down DC/DC Converter. VIN VOUT IOUT CONTROL CIRCUIT SW LOAD VG C + D + - VL L Fig. 1 Step-Down DC/DC Converter The voltage and current waveforms in the circuit are shown in Fig. 2. The control circuit is used to detect the output voltage level and generates a driving signal to turn on or turn off on the power switch (SW). The power switch can be controlled by using different methods, such as pulse width modulation (PWM), pulse frequency modulation (PFM), or pulse skipping modulation (PSM), depends on the applications. As for the output voltage stability, it is maintained by controlling the duty cycle without losing energy. This may be illustrated by examining the energy stored in the inductor. Driving signal on SW VG t SW current ISW t Inductor current IL t Output voltage VOUT t Fig. 2 Voltage and Current Waveforms of Converter The input electric energy is delivered to the load and partially stored in an inductor during the power switch turned on. The stored energy will be also transferred to the load through a free-wheel diode |
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