FSFR1800HSL データシートの表示（PDF） - Unspecified

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FSFR1800HSL

FSFR-HS Series — Advanced Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters

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Figure 29. Capacitive Sensing

9. PCB Layout Guidelines: Duty imbalance problems

may occur due to the radiated noise from the main

transformer, the inequality of the secondary side

leakage inductances of main transformer, and so on.

This is one of the reasons that the control components

in the vicinity of the RT pin are enclosed by the primary

current flow pattern on PCB layout. The direction of the

magnetic field on the components caused by the

primary current flow is changed when the high- and

low-side MOSFET turn on by turns. The magnetic fields

with opposite directions induce a current through, into,

or out of the RT pin, which makes the turn-on duration

of each MOSFET different. It is strongly recommended

to separate the control components in the vicinity of the

RT pin from the primary current flow pattern in the PCB

layout. Figure 30 shows an example for a duty-

balanced case.

Figure 30. Example of Duty Balancing

© 2011 Fairchild Semiconductor Corporation

FSFR1800 / FSFR1700-HS • Rev.1.0.1

13

www.fairchildsemi.com

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