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LM2575D2T-5R4 数据表(PDF) 7 Page - ON Semiconductor |
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LM2575D2T-5R4 数据表(HTML) 7 Page - ON Semiconductor |
7 / 26 page LM2575 http://onsemi.com 7 Figure 14. Typical Test Circuit D1 1N5819 L1 330 mH Output 2 4 Feedback Cout 330 mF /16 V Cin 100 mF/50 V LM2575−5 1 5 3ON/OFF GND Vin Load Vout Regulated Output Vin Unregulated DC Input 8.0 V − 40 V D1 1N5819 L1 330 mH Output 2 4 Feedback Cout 330 mF /16 V Cin 100 mF/50 V LM2575 Adjustable 1 5 3ON/OFF GND Vin Load Vout Regulated Output Unregulated DC Input 8.0 V − 40 V 5.0 Output Voltage Versions Adjustable Output Voltage Versions Vout + Vref 1 ) R2 R1 R2 + R1 Vout V ref –1 Where Vref = 1.23 V, R1 between 1.0 k W and 5.0 kW R2 R1 + − + − 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 14, 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 LM2575 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 LM2575 regulator. |
类似零件编号 - LM2575D2T-5R4 |
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类似说明 - LM2575D2T-5R4 |
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