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LM2594DADJR2G 데이터시트(PDF) 9 Page - ON Semiconductor |
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LM2594DADJR2G 데이터시트(HTML) 9 Page - ON Semiconductor |
9 / 25 page LM2594 http://onsemi.com 9 PROCEDURE (ADJUSTABLE OUTPUT VERSION: LM2594) Procedure Example Given Parameters: Vout = Regulated Output Voltage Vin(max) = Maximum DC Input Voltage ILoad(max) = Maximum Load Current Given Parameters: Vout = 5.0 V Vin(max) = 12 V ILoad(max) = 0.5 A 1. Programming Output Voltage To select the right programming resistor R1 and R2 value (see Figure 1) use the following formula: Resistor R1 can be between 1.0 k and 5.0 kW. (For best temperature coefficient and stability with time, use 1% metal film resistors). Vout + Vref 1.0 ) R2 R1 R2 + R1 Vout Vref * 1.0 where Vref = 1.23 V 1. Programming Output Voltage (selecting R1 and R2) Select R1 and R2: R2 = 3.0 kW, choose a 3.0k metal film resistor. R2 + R1 Vout Vref * 1.0 + 5V 1.23 V * 1.0 Vout + 1.23 1.0 ) R2 R1 Select R1 = 1.0 kW 2. Input Capacitor Selection (Cin) To prevent large voltage transients from appearing at the input and for stable operation of the converter, an aluminium or tantalum electrolytic bypass capacitor is needed between the input pin +Vin 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. For additional information see input capacitor section in the “Application Information” section of this data sheet. 2. Input Capacitor Selection (Cin) A 68 mF, 50 V aluminium electrolytic capacitor located near the input and ground pin provides sufficient bypassing. 3. Catch Diode Selection (D1) A. Since the diode maximum peak current exceeds the 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 LM2594 to be able to withstand a continuous output short. B. The reverse voltage rating of the diode should be at least 1.25 times the maximum input voltage. 3. Catch Diode Selection (D1) A. For this example, a 1.0 A current rating is adequate. B. For Vin = 12 V use a 20 V 1N5817 Schottky diode or any suggested fast recovery diode in the Table 2. |
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