SI82390AD-IS Datasheet, PDF (9/38 Pages) Silicon Laboratories – 4.0 A ISODrivers with 2.5 V VDDI and Safety Features

Si8239x Data Sheet
System Overview
2.3 Power Supply Connections
Isolation requirements mandate individual supplies for VDDI, VDDA, and VDDB. The decoupling caps for these supplies must be
placed as close to the VDD and GND pins of the Si8239x as possible. The optimum values for these capacitors depend on load current
and the distance between the chip and the regulator that powers it. Low effective series resistance (ESR) capacitors, such as Tantalum,
are recommended.
2.4 Power Dissipation Considerations
Proper system design must assure that the Si8239x operates within safe thermal limits across the entire load range. The Si8239x total
power dissipation is the sum of the power dissipated by bias supply current, internal parasitic switching losses, and power dissipated by
the series gate resistor and load. Equation 1 shows Si8239x power dissipation.
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