SiC FET-Ready ISODrivers with Integrated DC-DC Converters
The Si828x family (Si8281/82/83/84) is comprised of isolated, high-current gate drivers with integrated system safety and feedback functions. These devices are ideal for driving Silicon Carbide (SiC) FETs, power MOSFETs, and IGBTs used in a wide variety of inverter and motor control applications. The Si828x isolated gate drivers utilize Skyworks' 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-to-part matching, and superior common-mode rejection compared to other isolated gate driver technologies.
n 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 switches but are limited in dc-dc voltage input to the device bias. The Si8282 and Si8284 utilize an external power switch and are able to accept much higher voltage input power. User-adjustable frequency for minimizing emissions, a soft-start function for safety, and shut-down capability 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 faults through an active-low reset pin.
On the output side, Si828x devices provide separate pull-up and pull-down pins for the gate. A dedicated DSAT pin detects a desaturation condition and immediately shuts down the driver in a controlled manner using soft shutdown. The Si828x devices also integrate a Miller clamp to assure a strong turn-off of the power switch.
Automotive Grade is available. These products are built using automotive-specific flows at all steps in the manufacturing process to ensure the robustness and low defectivity required for automotive applications.
Features
- System Safety Features. DESAT detection. FAULT feedback. Undervoltage Lock Out (UVLO) including 13 and 15 V for SiC FET. Soft shutdown on fault condition. Ultra-fast short circuit protection less than 1 us. Robust reference design for current boost, DESAT adjustment, soft shutdown tuning, and external Miller clamp transistor
- High-performance isolation technology
- High CMTI 125 kV/us
- 30 V driver-side supply voltage
- Integrated Miller clamp
- Power ready pin
- Complementary driver control input
- Compact packages: 20 and 24-pin wide-body SOIC
- Integrated DC-DC converter. Feedback-controlled converter with dithering for low EMI. DC-DC converter efficiency of 83%. Shutdown, frequency, and soft start controls
- Temp range –40 to 125 C
- AEC-Q100 Qualified
- Automotive-grade OPNs available. PPAP documentation support. IMDS and CAMDS listing support.
Applications
- SiC/IGBT/ MOSFET gate drives
- Industrial and renewable energy inverters
- AC, Brushless, and DC motor controls
- Variable-speed motor controllers
- Isolated switch mode power supplies
- Hybrid electric and electric vehicles
- Traction inverters
- On-board chargers
- Inductive chargers
- DC-DC converters
