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LM2576T-ADJ データシート(PDF) 21 Page - ON Semiconductor |
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LM2576T-ADJ データシート(HTML) 21 Page - ON Semiconductor |
21 / 28 page LM2576 http://onsemi.com 21 Figure 32. Undervoltage Lockout Circuit for Buck Converter R2 10 k Z1 1N5242B R1 10 k Q1 2N3904 R3 47 k Vth ≈ 13 V Cin 100 mF LM2576−XX 1 3 5GN D ON/OFF +Vin +Vin NOTE: This picture does not show the complete circuit. The following formula is used to obtain the peak inductor current: where ton + |V O | V in ) |V O | x 1.0 fosc , and fosc + 52 kHz. I peak [ I Load (V in ) |V O |) V in ) V in xton 2L 1 Under normal continuous inductor current operating conditions, the worst case occurs when Vin is minimal. Figure 33. Undervoltage Lockout Circuit for Buck−Boost Converter R2 15 k Z1 1N5242B R1 15 k Q1 2N3904 R3 47 k Vth ≈ 13 V Cin 100 mF LM2576−XX 1 3 5GN D ON/OFF +Vin +Vin Vout NOTE: This picture does not show the complete circuit. Adjustable Output, Low−Ripple Power Supply A 3.0 A output current capability power supply that features an adjustable output voltage is shown in Figure 34. This regulator delivers 3.0 A into 1.2 V to 35 V output. The input voltage ranges from roughly 3.0 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 34. 1.2 to 35 V Adjustable 3.0 A Power Supply with Low Output Ripple D1 1N5822 L1 150 mH Output 2 4 Feedback R2 50 k R1 1.21 k L2 20 mH Output Voltage 1.2 to 35 V @ 3.0 A Optional Output Ripple Filter 40 V Max Unregulated DC Input Cout 2200 mF C1 100 mF Cin 100 mF LM2574−Adj 1 5 3ON/OFF GN D +Vin |
同様の部品番号 - LM2576T-ADJ |
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同様の説明 - LM2576T-ADJ |
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