Power converter chip targets ultra-low power 5V supplies
The VIPER01 is aimed at low-power applications in home appliances, building, lighting, and motion control, as well as small industrial and consumer applications by operating directly from a rectified mains supply. It integrates an 800V avalanche-rugged Power MOSFET with PWM (Pulse-Width Modulation) current-mode control and multiple protection circuits and can 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 which is now in its second generation (see chart above). It uses ST’s proprietary BCD (Bipolar-CMOS-DMOS) process technology to integrate the 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 controller 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. It includes embedded HV start-up and a built-in soft-start and sense-FET as well as drain current limit protection and a wide supply-voltage range from 4.5V to 30V. The self-supply option allows auxiliary winding or bias components to be removed to reduce costs, while the jittered switching frequency reduces the EMI filter cost. ;
There is also an embedded error amplifier with 1.2V reference voltage, thmeral shutdown protectiono and an automatic restart that includes overload/short-circuit, line or output OVP, maximum duty cycle counter and VCC clamp.
It comes with a set of tools including evaluation kits, application notes, and spice models to jumpstart more robust, safer, and cost-effective SMPS designs and is available in volume at a price of US$ 0.364 for 1,000 units.
For further information please visit www.st.com/viperplus
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