PTC Heaters
Positive temperature coefficient (PTC) heaters provide in-cabin heating to assure passenger comfort, converting stored high voltage power to heat as part of an electric or hybrid electric vehicle’s HVAC system. Skyworks digital isolation, isolated current and voltage sensors, and isolated gate drivers provide the necessary components for high voltage heating system designs with robust efficiency and stable and consistent heat delivery.

Si828x

Si828x isolated gate drivers are ideal for driving Silicon Carbide (SiC) FETs, IGBTs, and silicon MOSFETs in a wide variety of inverter and electric vehicle systems. Si828x devices are isolated, high current gate drivers with integrated system safety and feedback functions. Based on our proprietary silicon isolation technology, the drivers support up to 5.0 kV RMS and withstand voltage per UL1577, enabling 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.

The input side includes a complementary PWM input with multiple configurations, as well as digital control and feedback signals. The controller to the device receives information about the driver side power state and fault state and recovers the device from fault through an active-low reset pin. On the output side, Si828x provides separate pull-up and pull-down pins for the gate, and a dedicated DSAT pin quickly detects a switch desaturation condition and immediately shuts down the driver in a controlled manner. Positive and negative gate voltages so necessary to robust SiC FET and IGBT operation are readily generated using an included source reference pin. To facilitate a strong turn-off of the power switch, a Miller clamp is integrated. Robust controls are available through simple bill-of-materials changes to adjust desaturation response time, desaturation threshold voltage, soft shutdown duration, drive boost current, and external Miller clamp capability.

Si8932

The SI893x’s 0 to 2.25 V specified input range is ideal for isolated voltage sensing. Flexible output options include differential analog (Si8931) and single-ended analog (Si8932). The Si893x provides excellent linearity with low offset and gain drift to ensure that accuracy is maintained over the entire operating temperature range.

Si823H9

Si823Hx devices are robust gate drivers for silicon-, GaN- or SiC-based power converter systems, such as SMPS or inverters. Features include a robust 30 V driver VDD capability, low latency for tighter loop control, noise filtering; high CMTI of 125 kV/µs, -5 V voltage withstand on output pins and over-temperature protection.

Si88342

Si88xx integrated products for signal and power isolation are complete isolation solutions, combining high speed digital isolators with an isolated power supply. These products are ideal for applications like industrial automation, programmable logic controllers (PLC), battery management systems, and motor control that require long-term performance.

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