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LM2574N-12 データシート(PDF) 8 Page - ON Semiconductor |
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LM2574N-12 データシート(HTML) 8 Page - ON Semiconductor |
8 / 28 page LM2574 http://onsemi.com 8 Figure 16. Test Circuit and Layout Guidelines D1 1N5819 L1 330 µH Output 7 1 Feedback Cout 220 µF Cin 22 µF LM2574 Fixed Output 1 3 4ON/OFF Pwr Gnd Vin Load Vout D1 1N5819 L1 330 µH Output 7 1 Feedback Cout 220 µF Cin 22 µF LM2574 Adjustable 1 Vin Load Vout 5.0 V Fixed Output Voltage Versions Adjustable Output Voltage Versions Vout + Vref 1.0 ) R2 R1 R2 + R1 Vout Vref 1.0 Where Vref = 1.23 V, R1 between 1.0 kΩ and 5.0 kΩ R2 6.12 k R1 2.0 k 7.0 - 40 V Unregulated DC Input 2 Sig Gnd 3 4ON/OFF Pwr Gnd 2 Sig Gnd 7.0 V - 40 V Unregulated DC Input Cin –22 µF, 60 V, Aluminium Electrolytic Cout – 220 µF, 25 V, Aluminium Electrolytic D1 – Schottky, 1N5819 L1 – 330 µH, (For 5.0 Vin, 3.3 Vout, use 100 µH) R1 – 2.0 k, 0.1% R2 – 6.12 k, 0.1% NOTE: Pin numbers in ( ) are for the SO–16W package. (12) (3) (6) (4) (5) (14) (12) (3) (14) (6) (4) (5) PCB LAYOUT GUIDELINES As in any switching regulator, the layout of the printed circuit board is very important. Rapidly switching currents associated with wiring inductance, stray capacitance and parasitic inductance of the printed circuit board traces can generate voltage transients which can generate electromagnetic interferences (EMI) and affect the desired operation. As indicated in the Figure 16, to minimize inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. For best results, single–point grounding (as indicated) or ground plane construction should be used. On the other hand, the PCB area connected to the Pin 7 (emitter of the internal switch) of the LM2574 should be kept to a minimum in order to minimize coupling to sensitive circuitry. Another sensitive part of the circuit is the feedback. It is important to keep the sensitive feedback wiring short. To assure this, physically locate the programming resistors near to the regulator, when using the adjustable version of the LM2574 regulator. |
同様の部品番号 - LM2574N-12 |
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同様の説明 - LM2574N-12 |
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