CHL8515 Datasheet, PDF (14/16 Pages) International Rectifier – High‐Efficiency Variable Gate MOSFET Driver

High‐Efficiency Variable Gate MOSFET Driver _CHL8515
PCB LAYOUT CONSIDERATIONS
PCB layout and design is important to driver performance
in voltage regulator circuits due to the high current slew
rate (di/dt) during MOSFET switching.
 Locate all power components in each phase as
close to each other as practically possible in order
to minimize parasitics and losses, allowing for
reasonable airflow.
 Input supply decoupling and bootstrap capacitors
should be physically located close to their
respective IC pins.
 High current paths like the gate driver traces
should be as wide and short as practically possible.
 Trace inductances to the high‐ and low‐side
MOSFETs should be minimized.
 The ground connection of the IC should be as close
as possible to the low‐side MOSFET source.
 Use of a copper plane under and around the IC
and thermal vias to connect to buried copper
layers improves the thermal performance.
MOSFET stages should be well bypassed with capacitors
placed between the drain of the HIGH‐side MOSFET and
the source of the LOW‐side MOSFET.
14 December 6, 2011 | FINAL | V1.05