|
The design uses an LM2737 synchronous controller utilizing external high side and low side N-channel MOSFETs. 200kHz switching frequency has been chosen to maximize efficiency. In such high current applications careful PC board layout is critical to achieve low switching losses and clean, stable operation. The switching power stage requires particular attention. Few points to note for this design are:
1) Decoupling capacitors are close to IC pins as possible. Keep separate power ground plane.
2) Input and output capacitors are connected to the power ground plane; all other capacitors are connected to the signal ground plane.
3) High current paths are very short.
4) Multiple MOSFETs have been used to reduce the conduction and switching losses.
5) Feedback connections are short and direct.
6) High-side MOSFETs are as close as possible to the controller.
Note that this design can use an LM2727 in place of the LM2737. The LM2727 and LM2737 are pin-to-pin compatible devices.
| 
Example Schematic Showing Connection for all Components.
