STMicroelectronics Manuals

This document describes the interface issues between the PFC stage and PWM controllers in switch mode power supplies with power factor correction, and provides examples of how to interface the L4981A with other PWM controllers.

This application note presents a practical power factor corrected design for a 500 Watt output and universal mains input application. The detailed derivations of all power, IC biasing and control component values and types will be shown. The evaluation results from an actual working demoboard will be presented as well as several relevant oscillograms.

This document describes how to reduce the power consumption, under no-load conditions, of battery chargers and adapters by using STMicroelectronics’s TSM family of secondary-side devices. This family of devices provides accurate voltage and current regulation, while incurring very low consumption at no- load conditions. In fact, owing to these innovative, integrated devices, the total power consumption for the entire system at no-load conditions can be reduced down to nearly 100mW. With the arrival of new power consumption regulations, this capability is increasingly sought after.

This application note introduces an innovative solution to drive high brightness 1W LEDs (Light Emitting Diode), using VIPer22A-E in flyback configuration with output current control.

VIPer53 is a switch mode power supply module released by ST, supporting 90 to 264VAC input, output 24W power, and this application note introduces the use and precautions of VIPer53.

This application note describes the functions and features of STMicroelectronics' supervisor circuits, as well as the combinations of different models. These supervisor circuits effectively reduce the risk of system failure, ensure the safe operation of the system, and are cost-effective.

This document describes a DVD Combo power supply solution using the VIPer53 chip, suitable for devices in the 35W power range. It features high efficiency, low standby power consumption, and cost-effective solutions.

This application note covers 3 DC-DC power supplies to drive high intensity LEDs, namely L6920D boost converter, L4971 buck converter and L6902D buck converter.

This application note presents a reference design for non-isolated flyback converter based on VIPer12AS monolithic device. The circuit can be used to produce multiple outputs, non isolated positive or negative voltage. It is dedicated for building an auxiliary power supply based on the VIPer12AS monolithic device.

This document introduces the VIPer22A application for the DVD player power supply, which has the advantages of low cost, wide input voltage range and low power consumption

This application note describes a 375W evaluation board based on the L6562 Transition- mode Power Factor Correction (PFC) controller (order code: EVAL6562-375W). The board implements a 375W, wide-range mains input, PFC pre-regulator that is suitable for a 300/350W ATX12V power supply unit (PSU).

This application note presents a non isolated buck and buck-boost converter reference board based on the VIPer12AS monolithic device. The circuit can be used to produce a single, non isolated positive or negative voltage. It is dedicated for building an auxiliary power supply based on the VIPer12AS monolithic device with rather low output power required.

This application note details the main features and application advantages of STMicroelectronics’ new synchronous step-down regulator. After describing how the device works and the main features, a step-by-step design section is provided in order to help with the selection of the external components and the evaluation of the losses. The device performances are shown in terms of efficiency and thermal results. In conclusion, some application ideas are proposed.

This document describes the working principle and application methods of LEDs, and presents LED driving application examples using ST DC-DC converters.

The L6926 is a high efficiency monolithic synchronous step-down regulator from STMicroelectronics. It integrates a high voltage MOSFET and a synchronous rectifier and can operate at 100% duty cycle, delivering up to 800mA of continuous output current and regulating the output voltage from 0.6V to VIN. This device is designed using BCDV technology and has a low quiescent current (25μA) and shutdown current (0.2μA), making it very suitable for battery-powered equipment such as PDAs, handheld terminals, DSCs (digital still cameras) and cell phones.