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LM2576D2T-5 Arkusz danych(PDF) 8 Page - ON Semiconductor |
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LM2576D2T-5 Arkusz danych(HTML) 8 Page - ON Semiconductor |
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8 / 26 page  LM2576 http://onsemi.com 8 Figure 15. Typical Test Circuit D1 MBR360 L1 100 mH Output 2 4 Feedback Cout 1000 mF Cin 100 mF LM2576 Fixed Output 1 5 3ON/OFF GN D Vin Load Vout D1 MBR360 L1 100 mH Output 2 4 Feedback Cout 1000 mF Cin 100 mF LM2576 Adjustable 1 5 3ON/OFF GN D Vin Load Vout 5,000 V Fixed Output Voltage Versions Adjustable Output Voltage Versions Vout + Vref 1.0 ) R2 R1 R2 + R1 Vout V ref –1.0 Where Vref = 1.23 V, R1 between 1.0 k and 5.0 k R2 R1 Cin − 100 mF, 75 V, Aluminium Electrolytic Cout − 1000 mF, 25 V, Aluminium Electrolytic D1 − Schottky, MBR360 L1 − 100 mH, Pulse Eng. PE−92108 R1 − 2.0 k, 0.1% R2 − 6.12 k, 0.1% 7.0 V − 40 V Unregulated DC Input 7.0 V − 40 V Unregulated DC Input 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 15, 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 2 (emitter of the internal switch) of the LM2576 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 LM2576 regulator. |
Podobny numer części - LM2576D2T-5 |
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Podobny opis - LM2576D2T-5 |
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