High-Voltage Converter with Integrated 800V Switch
STMicroelectronics has introduced a high-voltage power converter that allows designers to build an ultra-low-consumption, simple, and cost-effective SMPS with a 5V output voltage. Particularly suited for low-power applications in home appliances, building, lighting, and motion control, as well as small industrial and consumer applications, the VIPER01 operates directly from a rectified mains supply and integrates an 800V avalanche-rugged power MOSFET with pwm current-mode control and multiple protection circuits. The converter is tailored to provide the auxiliary supply to microcontrollers in IoT devices that are permanently connected to the Internet or a local network.
The new device belongs to the VIPerPlus™ family of high-voltage converters, now in its second generation, and exploits ST’s proprietary BCD (Bipolar-CMOS-DMOS) technology. BCD allows the integration in a single chip of a high-performance pwm controller with a high-voltage logic-level control transistor, protection and diagnostic circuitry, without significantly impacting the robustness and reliability of the power transistor.
The VIPER01 enables designers to meet the most stringent energy-saving standards, as it has very low power consumption and switches automatically to pulse frequency modulation under light load conditions. It can be used in fly-back, buck, and buck-boost converter topologies, while the integrated high-voltage start-up, sense-FET, error amplifier, and oscillator with jitter allow a complete application to be designed with the minimum number of external components.
Key features of the VIPER01 include: 800 V avalanche-rugged power MOSFET allowing ultra-wide Vac input range; Embedded HV start-up and sense-FET; Current mode pwm controller; Drain current limit protection; Wide supply-voltage range from 4.5V to 30V; Self-supply option allows auxiliary winding or bias components to be removed; Jittered switching frequency reduces the EMI filter cost; Embedded error amplifier with 1.2V reference voltage; Protections with automatic restart include overload/short-circuit, line or output OVP, maximum duty cycle counter, Vcc clamp; Embedded thermal shutdown; and Built-in soft-start for improved system reliability.
The VIPER01 comes with a set of tools including evaluation kits, application notes, and spice models to jumpstart more robust, safer, and cost-effective SMPS designs. VIPER01 is available now in volume at a price of US$ 0.364 for 1,000 units.
