ST Manuals

This paper provides a model and a tool for evaluating and improving the control loop characteristics of L6561-based PFC preregulators in boost topology and operated in Transition Mode (TM). The model can be used to evaluate the control loop performance of TM PFC preregulators and to optimize the design of TM PFC preregulators.

This application note presents the L4978, a 2A monolithic step-down DC-DC converter. It is realized in BCD60 II technology, and it is available in two plastic packages, MINIDIP and SO16L. One direct fixed output voltage at 3.3V ±1% is available, adjustable for higher output voltage values, till 40V, by an external voltage divider. The operating input supply voltage ranges from 8V to 55V, while the absolute value, with no load, is 60V. New internal design solutions and superior technology performance allow to generate a device with improved efficiency in all the operating conditions and with reduced EMI due to an inno- vative internal driving circuit, and reduced external component counts. While internal limiting current and thermal shutdown are today considered standard protection functions, mandatory for a safe load supply, oscillator with voltage feedforward improves line regulation and overall control loop. Soft-start avoids output overvoltages at turn-on, while, shorting this pin to ground, the device is completely disabled, going into zero consumption state.

This application note explains how to use the VIPER20, ST62 µController, and TSM102A to implement a dual Li-Ion battery charger in an SMPS-type battery charger. It features constant current/constant voltage charging, battery type recognition, precision voltage control, temperature and failing battery protection, and end of charge detection.

This paper describes a flyback converter design method based on L6561, which has good performance and low power consumption characteristics, suitable for medium and low power applications

This application note describes how to design high power factor feedback flyback converters using the L6561.

This document describes how to reduce the power loss of light loaded flyback converters with L5991 controller.

This application note describes how to use the L6561 controller to replace magnetic amplifiers in computer power supplies for secondary regulation.

L4971 is ST company's 1.5A high efficiency DC-DC converter, working in fixed frequency continuous mode. This application note introduces the internal design and application circuits of this device, including power supply voltage, output voltage, limiting circuit, temperature shutdown and other circuit design

AN938 application note describes the design of L4973 3.5A high efficiency DC-DC converter, which uses BCD60 II technology and adopts continuous mode step-down topology. The input voltage range is 8V-55V, and the output voltage is 60V in no-load condition. The internal current limiting and thermal shutdown are considered as standard protection functions for safe load supply, and an oscillator with voltage feed-forward improves line regulation and overall control loop. The soft-start function prevents output overvoltage at turn-on, and the synchronization function can reduce EMI problems in multi-output power supplies. The inhibit function, introduced for power management in equipment having standby features, when active (high), reduces device power consumption by a few tens of µA.

This document introduces the L6561 power converter application. The power converter uses the TM technique to achieve power factor correction, which has high power factor and low harmonics.

The TSM101 is a voltage and current controller providing a more integrated solution in Switching Mode Power Supply application versus common standard ICs solution, with more functions widely used in power control in a single IC. This application note shows three basic configurations of the IC, to be used in the secondary side of any SMPS. Functions described are precise secondary voltage regulation, current limiting with foldback function, window detector with output feedback to opto-coupler or power good signal to CPU.

TSM101 is a linear battery charger for nickel-cadmium batteries. It can charge at 200mA or 60mA, depending on whether the charge control input is open or grounded.

L296 is a power switching regulator that can power microprocessors. The output voltage is 5.1V to 40V and the current is 4A