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TC2574-VPA 데이터시트(PDF) 7 Page - TelCom Semiconductor, Inc |
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TC2574-VPA 데이터시트(HTML) 7 Page - TelCom Semiconductor, Inc |
7 / 25 page 7 TC2574 0.5A Step-Down Switching Regulator TC2574-1 1/6/00 Procedure (Fixed Output Voltage Version) In order to simplify the switching regulator design, a step-by-step design procedure and examples are provided. Procedure Example Given Parameters: Given Parameters: VOUT = Regulated Output Voltage (3.3V, 5.0V or 12V) VOUT = 5.0 V VIN(max) = Maximum Input Voltage VIN (max) = 15 V ILOAD(max) = Maximum Load Current ILOAD (max) = 0.4 A 1. Controller IC Selection 1. Controller IC Selection According to the required input voltage, output voltage and According to the required input voltage, output voltage, current select the appropriate type of the controller polarity and current value, use the TC2574–5 IC output voltage version. controlller IC. 2. Input Capacitor Selection (CIN ) 2. Input Capacitor Selection (CIN ) To prevent large voltage transients from appearing at the input A 22 µF, 25V aluminium electrolytic capacitor tantalum electrolytic bypass capacitor is needed between the located near to the input and ground pins provides input pin +VIN and ground pin Gnd. This capacitor should be sufficient bypassing. located close to the IC using short leads. This capacitor should have a low ESR (Equivalent Series Resistance) value. 3. Catch Diode Selection (D1) 3. Catch Diode Selection (D1) A. Since the diode maximum peak current exceeds the A. For this example the current rating of the diode is 1.0A regulator maximum load current. For a robust design the diode should have a current rating equal to the maximum current limit of the TC2574 to be able to withstand a continuous output short. B. The reverse voltage rating of the diode should be at least B. Use a 20V 1N5817 Schottky diode, or any of the 1.25 times the maximum input voltage. suggested fast recovery diodes shown in Table 1. 4. Inductor Selection (L1) 4. Inductor Selection (L1) A. According to the required working conditions, select the A. Use the inductor selection guide shown in Figure 38. correct inductor value using the selection guide from Figures 39 to 41. B. From the appropriate inductor selection guide, identify the B. From the selection guide, the inductance area inductance region intersected by the Maximum Input Voltage intersected by the 15V line and 0.4A line is 330. line and the Maximum Load Current line. Each region is identified by an inductance value and an inductor code. C. Select an appropriate inductor from the several different C. Inductor value required is 330 µH. From Table 2, manufacturers part numbers listed in Table 2. The designer choose an inductor from any of the listed must realize that the inductor current rating must be higher manufacturers. than the maximum peak current flowing through the inductor. This maximum peak current can be calculated as follows: IP (max) = ILOAD (max)+ (VIN – VOUT ) tON 2L where tON is the "on" time of the power switch and tON = VOUT x 1.0 VIN fOSC For additional information about the inductor, see the inductor section in the “EXTERNAL COMPONENTS” section of this data sheet. |
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