UC3750

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

7 of 8

www.unisonic.com.tw

QW-R502-360.b

DESCRIPTION INFORMATION(Cont.)

12. PCB Layout Recommendations

Good PCB layout is important in switching mode power conversion. Careful PCB layout can minimize ground

bounce, EMI noise and unwanted feedbacks that can affect the converter performance.

13. Grounding

The output power return ground, the input power return ground and the device power ground should be

connected at the Star-ground. Feedback signal path must be separated from the main current path and sensing

directly at the anode of the output capacitor. All high current running paths must be thick enough for current flowing

through and producing insignificant voltage drop along the path.

14. Components Placement

Power components including input capacitor, inductor and output capacitor must be placed as close as possible.

All connecting traces must be short, direct and thick. In order to avoid unwanted injection of noise into the feedback

path high current flowing and switching paths must be kept away from the feedback pin terminal.

15. Feedback Path

Feedback of the output voltage must be separated from the power path. The output voltage sensing trace to the

feedback pin should be connected to the output voltage directly at the anode of the output capacitor.