ISL6559 Intersil Corporation, ISL6559 Datasheet - Page 20

• Manufacturer Part Number: ISL6559
• Description: Multi-Phase PWM Controller
• Manufacturer: Intersil Corporation

ISL6559
The ISL6559 can be placed off to one side or centered
relative to the individual phase switching components.
Routing of sense lines and PWM signals will guide final
placement. Critical small signal components to place close
to the controller include the ISEN resistors, R
resistor,
T
feedback resistor, and compensation components.
Bypass capacitors for the ISL6559 and HIP660X driver bias
supplies must be placed next to their respective pins. Stray
trace parasitics will reduce their effectiveness.
Plane Allocation and Routing
Dedicate one solid layer, usually a middle layer, for a ground
plane. Make all critical component ground connections with
vias to this plane. Dedicate one additional layer for power
planes; breaking the plane up into smaller islands of
common voltage. Use the remaining layers for small signal
wiring.
Route PHASE planes of copper filled polygons on the top
and bottom once the switching component placement is set.
Size the trace width between the driver gate pins and the
MOFET gates to carry 1A of current. When routing
components in the switching path, use short wide traces to
reduce the associated parasitics.
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