Analog Devices ADP1612 Evaluation Board ADP1612-BL3-EVZ ADP1612-BL3-EVZ 数据表

 

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For high efficiency, good regulation, and stability, a well-
designed printed circuit board (PCB) layout is essential. 

Use the following guidelines when designing PCBs: 

•  Keep the low ESR input capacitor, C

IN

 (labeled as C7 in 

Figure 8), close to VIN and GND. This minimizes noise 
injected into the part from board parasitic inductance. 

•  Keep the high current path from C

IN

 (labeled as C7 in 

Figure 8) through the L1 inductor to SW and GND as 
short as possible.  

•  Keep the high current path from VIN through L1, the 

rectifier (D1), and the output capacitor, C

OUT

 (labeled as  

C4 in Figure 8), as short as possible.  

•  Keep high current traces as short and as wide as possible.  
•  Place the feedback resistors as close to FB as possible to 

prevent noise pickup. Connect the ground of the feedback 
network directly to an AGND plane to make a Kelvin 
connection to the GND pin.  

•  Place the compensation components as close as possible to 

COMP. Connect the ground of the compensation network 
directly to an AGND plane that makes a Kelvin connection 
to the GND pin. 

•  Connect the soft start capacitor, C

SS

 (labeled as C1 in 

Figure 8), as close to the device as possible. Connect the 
ground of the soft start capacitor to an AGND plane that 
makes a Kelvin connection to the GND pin. 

•  Avoid routing high impedance traces from the compensa-

tion and feedback resistors near any node connected to SW 
or near the inductor to prevent radiated noise injection.