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TC2575-5.0VAT 数据表(PDF) 7 Page - TelCom Semiconductor, Inc |
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TC2575-5.0VAT 数据表(HTML) 7 Page - TelCom Semiconductor, Inc |
7 / 25 page 7 TC2575 TC2575-1 3/13/00 1.0A Step-Down Switching Regulator Procedure (Fixed Output Voltage Version) In order to simplify the switching regulator design, a step-by-step design procedure and some examples are provided. Procedure Example Given Parameters: Given Parameters: VOUT = Regulated Output Voltage (3.3V, 5.0V or 12V) VOUT = 5.0V VIN(max) = Maximum DC Input Voltage VIN (max) = 20V ILOAD(max) = Maximum Load Current ILOAD (max) = 0.8A 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 IC output current polarity and current value, use the TC2575 (5V) voltage version. controller IC. 2. Input Capacitor Selection (CIN ) 2. Input Capacitor Selection (CIN ) To prevent large voltage transients from appearing at the input A 47 µF, 25V aluminium electrolytic capacitor and for stable operation of the converter, an aluminum or tantalum located near to the input and ground pins provides electrolytic bypass capacitor is needed between the input pin +VIN sufficient bypassing. and ground pin GND. This capacitor should be 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, the catch diode current rating must be at least 1.2 times greater than the maximum load current. For a robust design the diode should have a current rating equal to the maximum current limit of the TC2575 to be able to withstand a continuous output short. B. The reverse voltage rating of the diode should be at least B. Use a 30V 1N5818 Schottky diode, or any of the 1.25 times the maximum input voltage. suggested fast recovery diodes shown in Table 4. 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 32 correct inductor value using the selection guide from to 36. Figures 32 to 36. 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 20V line and 0.8A line is L300. 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 300 µH. From Table 1, or manufacturers part numbers listed in Table 1 or Table 2 Table 2, choose an inductor from any of the listed When using Table 2 for selecting the right inductor, the manufacturers. designer must realize that the inductor current rating must be higher 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. |
类似零件编号 - TC2575-5.0VAT |
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类似说明 - TC2575-5.0VAT |
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