Landscape Light Printed Circuit Board

Landscape Light Printed Circuit Board

PCBA samples leadtime:15-20 working days Test:100% E-test and Functional test Certificate:UL,ISO9001,ISO14001,ROHS,CQC

Product Details

Landscape light printed circuit board



11

matters need attention :
High impedance nodes should be checked as they are easily disturbed.
The most critical node is the feedback pin of the IC, the signal is taken from the resistor divider. The FB pin is the input to an amplifier (such as the LM25576) or a comparator (such as a hysteresis regulator). In both cases, the impedance at the FB point is quite high. Therefore, the resistor divider should be placed on the right side of the FB pin, with a short wire from the middle of the resistor divider to the FB. The wires from the output to the resistor divider are low impedance and can be connected to the resistor divider with longer conductors. The focus here is on the routing method rather than the wire length.
Other nodes are not so critical. So don't worry about the switch node, diode, COUT, VIN pin or CIN of the switch IC.

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The wiring method will make a difference for the resistor divider. This wire is connected from COUT to the resistor divider and grounded back to COUT. We must ensure that the loop does not form an open area. The open area will function as a receiving antenna. If we can ensure that the ground plane under the conductor is undisturbed, the area formed by the conductor and the ground below it and between level 1 and level 2 should be undisturbed.  

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From the switching output of the IC to the diode and inductor nodes; from the diode to the node. Both wires have a high di/dt: these wires should be as short and thick as possible, whether the switch is conducting or the diode is flowing. The wires from the node to the inductor and from the inductor to COUT are less critical. In this example, the inductor current is relatively constant and changes slowly. All we have to do is make sure it is a low impedance point to minimize the voltage drop.
 


The wiring method will make a difference for the resistor divider. This wire is connected from COUT to the resistor divider and grounded back to COUT. We must ensure that the loop does not form an open area. The open area will function as a receiving antenna. If we can ensure that the ground plane under the conductor is undisturbed, the area formed by the conductor and the ground below it and between level 1 and level 2 should be undisturbed. Now, we can see why the grounding should not be placed at level 4 because the distance has increased significantly.

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There is a large current at the ground connection of the diode, COUT, CIN, and load. The current flowing through the ground connection of the switching regulator is small. The same applies to the ground reference of the resistor divider.

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The wiring method will make a difference for the resistor divider. This wire is connected from COUT to the resistor divider and grounded back to COUT. We must ensure that the loop does not form an open area. The open area will function as a receiving antenna. If we can ensure that the ground plane under the conductor is undisturbed, the area formed by the conductor and the ground below it and between level 1 and level 2 should be undisturbed.

 

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