This is a design for evaluation circuit. This circuit is based on LM2651. This is the figure of the circuit.
The evaluation board is designed to supply 3.3V at 15 mA up to 1.5A. The input voltage range is 4V to 14V. PCB layout is critical to reduce noise and ensure specified performance for any power supply design. To minimize the parasitic inductance in the loop of input capacitors and the internal MOSFETs, connect the capacitors to VIN and PGND pins with short and wide traces. This is important because the rapidly switching current, together with wiring inductance can generate large voltage spikes that may cause noise problems. The feedback trace from the output to the feedback pin should be wide, short and kept away from the flux field of the inductor.
The evaluation board is designed to supply 3.3V at 15 mA up to 1.5A. The input voltage range is 4V to 14V. PCB layout is critical to reduce noise and ensure specified performance for any power supply design. To minimize the parasitic inductance in the loop of input capacitors and the internal MOSFETs, connect the capacitors to VIN and PGND pins with short and wide traces. This is important because the rapidly switching current, together with wiring inductance can generate large voltage spikes that may cause noise problems. The feedback trace from the output to the feedback pin should be wide, short and kept away from the flux field of the inductor.
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