ISL6566A datasheet(26/28 Pages) INTERSIL

Part #	ISL6566A

Description	Three-Phase Buck PWM Controller with Two Integrated MOSFET Drivers and One External Driver Signal

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Manufacturer	INTERSIL [Intersil Corporation]

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26 / 28 page

26

FN9200.2

July 27, 2005

Thermal Management

For maximum thermal performance in high current, high

switching frequency applications, connecting the thermal

GND pad of the ISL6566 to the ground plane with multiple

vias is recommended. This heat spreading allows the part to

achieve its full thermal potential. It is also recommended

that the controller be placed in a direct path of airflow if

possible to help thermally manage the part.

Suppressing MOSFET Gate Leakage

With VCC at ground potential, UGATE is high impedance. In

this state, any stray leakage has the potential to deliver

charge to the gate of the upper MOSFET. If UGATE receives

sufficient charge to bias the device on, a low impedance path

will be connected between the upper MOSFET drain and

PHASE. If this occurs and the input power supply is present

and active, the system could see potentially damaging

current. Worst-case leakage currents are on the order of

pico-amps; therefore, a 10k

Ω resistor, connected from

UGATE to PHASE, is more than sufficient to bleed off any

stray leakage current. This resistor will not affect the normal

performance of the driver or reduce its efficiency.

ISL6566A

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