 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
NCP1521 Datasheet(PDF) 12 Page - ON Semiconductor |
|
||||||||||||||||||||||||||||||
NCP1521 Datasheet(HTML) 12 Page - ON Semiconductor |
|
|
12 / 17 page 
NCP1521 http://onsemi.com 12 APPLICATION BOARD PCB Layout Recommendations Good PCB layout plays an important role in switching mode power conversion. Careful PCB layout can help to minimize ground bounce, EMI noise and unwanted feedback that can affect the performance of the converter. Hints suggested below can be used as a guideline in most situations. 1. Use star−ground connection to connect the IC ground nodes and capacitor GND nodes together at one point. Keep them as close as possible, and then connect this to the ground plane through several vias. This will reduce noise in the ground plane by preventing the switching currents from flowing through the ground plane. 2. Place the power components (i.e., input capacitor, inductor and output capacitor) as close together as possible for best performance. All connecting traces must be short, direct, and wide to reduce voltage errors caused by resistive losses through the traces. 3. Separate the feedback path of the output voltage from the power path. Keep this path close to the NCP1521 circuit. And also route it away from noisy components. This will prevent noise from coupling into the voltage feedback trace. 4. Place the DC−DC converter away from noise sensitive circuitry, such as RF circuits. The following shows the NCP1521 demo board schematic, layout, and bill of materials: GND 2 VIN 1 EN 3 LX 5 FB 4 OFF ON VIN CIN COUT R1 R2 Cff L VOUT Figure 27. NCP1521 Board Schematic Figure 28. NCP1521 Board Layout |
English ▼
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
