Si8281/82/83/84 Data Sheet
2019-05-24
The Si828x family (Si8281/82/83/84) is made up of isolated, high-current gate drivers
with integrated system safety and feedback functions. These devices are ideal for driving
power MOSFETs and IGBTs used in a wide variety of inverter and motor control applications.
The Si828x isolated gate drivers utilize Silicon Labs' proprietary silicon isolation
technology, supporting up to 5.0 kVrms withstand voltage per UL1577. This technology
enables higher-performance, reduced variation with temperature and age, tighter part-topart
matching, and superior common-mode rejection compared to other isolated gate
driver technologies.
In addition to the gate driver, the Si828x family integrates a dc-dc controller for simple
implementation of an isolated supply for the driver side. The Si828x dc-dc controller can
be ordered in two different configurations depending on what system voltage rails are
available and the amount of power needed. The Si8281 and Si8283 have integrated
power switch but are limited in dc-dc voltage input to the device bias. The Si8282 and
Si8284 utilize and external power switch and are able to accept much higher voltage input
power rail. User-adjustable frequency for minimizing emissions, a soft-start function
for safety, and a shut-down option are available options. The device requires only minimal
passive components and a miniature transformer.
The input to the device is a complementary digital input that can be utilized in several
configurations. The input side of the isolation also has several control and feedback digital
signals. The controller to the device receives information about the driver side power
state and fault state of the device and recovers the device from fault through an activelow
reset pin.
On the output side, Si828x devices provide separate pull-up and pull-down pins for the
gate. A dedicated DSAT pin detects the desaturation condition and immediately shuts
down the driver in a controlled manner. The Si828x devices also integrate a Miller clamp
to facilitate a strong turn-off of the power switch.
with integrated system safety and feedback functions. These devices are ideal for driving
power MOSFETs and IGBTs used in a wide variety of inverter and motor control applications.
The Si828x isolated gate drivers utilize Silicon Labs' proprietary silicon isolation
technology, supporting up to 5.0 kVrms withstand voltage per UL1577. This technology
enables higher-performance, reduced variation with temperature and age, tighter part-topart
matching, and superior common-mode rejection compared to other isolated gate
driver technologies.
In addition to the gate driver, the Si828x family integrates a dc-dc controller for simple
implementation of an isolated supply for the driver side. The Si828x dc-dc controller can
be ordered in two different configurations depending on what system voltage rails are
available and the amount of power needed. The Si8281 and Si8283 have integrated
power switch but are limited in dc-dc voltage input to the device bias. The Si8282 and
Si8284 utilize and external power switch and are able to accept much higher voltage input
power rail. User-adjustable frequency for minimizing emissions, a soft-start function
for safety, and a shut-down option are available options. The device requires only minimal
passive components and a miniature transformer.
The input to the device is a complementary digital input that can be utilized in several
configurations. The input side of the isolation also has several control and feedback digital
signals. The controller to the device receives information about the driver side power
state and fault state of the device and recovers the device from fault through an activelow
reset pin.
On the output side, Si828x devices provide separate pull-up and pull-down pins for the
gate. A dedicated DSAT pin detects the desaturation condition and immediately shuts
down the driver in a controlled manner. The Si828x devices also integrate a Miller clamp
to facilitate a strong turn-off of the power switch.
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