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LM2575D2T-015G 데이터시트(PDF) 22 Page - ON Semiconductor |
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LM2575D2T-015G 데이터시트(HTML) 22 Page - ON Semiconductor |
22 / 28 page LM2575, NCV2575 http://onsemi.com 22 Figure 32. Undervoltage Lockout Circuit for Buck−Boost Converter R2 15 k Z1 1N5242B R1 15 k Q1 2N3904 R3 68 k Vth ≈ 13 V Cin 100 mF LM2575−5.0 1 3 5 GND ON/OFF +Vin +Vin Vout = -5.0 V NOTE: This picture does not show the complete circuit. Adjustable Output, Low−Ripple Power Supply A 1.0 A output current capability power supply that features an adjustable output voltage is shown in Figure 33. This regulator delivers 1.0 A into 1.2 V to 35 V output. The input voltage ranges from roughly 8.0 V to 40 V. In order to achieve a 10 or more times reduction of output ripple, an additional L−C filter is included in this circuit. Figure 33. Adjustable Power Supply with Low Ripple Voltage D1 1N5819 L1 150 mH Output 2 4 Feedback R2 50 k R1 1.1 k L2 20 mH Regulated Output Voltage 1.2 V to 35 V @1.0 A Optional Output Ripple Filter Unregulated DC Input + Cout 2200 mF C1 100 mF Cin 100 mF /50 V LM2575−Adj 1 5 3ON/OFF GND +Vin 30 40 50 60 70 80 1.0 1.5 2.0 2.5 3.0 3.5 010 20 30 25 15 5.0 L, LENGTH OF COPPER (mm) Minimum Size Pad 2.0 oz. Copper L L Free Air Mounted Vertically Figure 34. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length PD(max) for TA = 50°C RqJA |
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