ST Manuals

This application note introduces anon isolated, soft-switched, single-stage high power factor offline LED driver from onsemi.

This application note describes the demonstration board of the all primary-sensing switching regulator ALTAIR05T-800 and presents the results of its bench evaluation. The board implements a 5 W (5 V / 1 A) wide range mains battery charger with constant voltage/constant current. The ALTAIR05T-800 combines a high-performance low-voltage PWM controller chip and an 800 V, avalanche rugged power MOSFET in the same package. The PWM chip is a quasi-resonant (QR) current mode controller IC specifically designed for QR ZVS (zero-voltage switching at switch turn-on) flyback converters. The device is capable of providing constant output voltage (CV) and constant output current (CC) regulation using primary sensing feedback. This eliminates the need for the optocoupler, the secondary voltage reference, as well as the current sensor, while maintaining very accurate regulation. Additionally, it is possible to compensate the voltage drop of the output cable, so as to improve CV regulation on the externally accessible terminals. Extremely low consumption under no-load conditions is ensured thanks to a controlled burst mode operation that, along with the built-in high-voltage startup circuit and the low operating current of the device, helps minimize residual input consumption. Although an auxiliary winding is required in the transformer to correct

This document describes the method of using the STC3100 battery monitor to implement gas gauge applications. The STC3100 is a new device that includes battery monitoring features (voltage, current, and temperature) and a Coulomb counter to implement a gas gauge system in existing or future applications.

This application note describes a demonstration board based on the transition-mode PFC controller L6563H and presents the results of its bench demonstration. The board implements a 100 W, wide-range mains input, PFC pre-conditioner suitable for ballast, adapters, flatscreen displays, and all SMPS having to meet the IEC61000-3-2 or the JEITA- MITI regulation. The L6563H is a current-mode PFC controller operating in transition mode (TM) and implementing an internal high-voltage startup circuitry.

This application note introduces the characteristics and applications of the STBP120 overvoltage protection device

This document describes a wide input voltage range single output power supply, and details its features and characteristics in applications such as LCD or plasma TVs, desktop computers, etc.

This application note describes how to use the STOD2540 DC-DC converter to generate two output voltages using a single inductor and an external charge pump. The STOD2540 is a highly integrated boost converter that can provide an adjustable output up to 35 V from a 3.0 to 5.5 V input voltage. The converter operates in PFM mode and is ideal for generating the necessary voltages to supply TFT LCDs, OLEDs, and E-paper shelf labels. Its low operating supply current makes it ideal for small, portable, battery-powered applications.

This application note describes a demonstration board based on the transition-mode PFC controller L6563S and presents the results of its bench evaluation. The board implements a 400 W, wide-range mains input, PFC pre-conditioner suitable for ATX PSU, flat screen displays, etc. The chip is operated with fixed off time control in order to use a low-cost device like the L6563S, which is usually prohibitive at this power level. Fixed-off-time control allows continuous conduction mode operation, which is normally achieved with more expensive control chips and more complex control architectures.

This application note describes the functioning of the STEVAL-ILL026V1 non-isolated 3 W offline LED driver power supply designed using the VIPER22A-E low power offline SMPS primary switcher from STMicroelectronics. The circuit regulates the load current to 350 mA and generates about 10 V. The load is composed of three high-brightness (HB) LEDs, connected in series. The project does not provide safety isolation between the input and output. This document provides the power supply specification, circuit diagrams, the complete bill of materials, and reports the results of circuit testing.

AN2941 is an application note released by ST company, which mainly introduces the application characteristics of L6563S and L6566A two chips, suitable for 75W adapter design. This application note introduces the characteristics of the two chips, circuit principle, efficiency measurement, harmonic content measurement and function check.

AN2938 Application note introduces the demonstration kit based on the PM6686 dual step-down controller with adjustable output voltages and adjustable LDO for notebook power systems.

PM6686 is a dual step-down controller with adjustable output voltages, adjustable LDO and charge pump circuit for notebook power systems. This application note describes the PM6686 demonstration kit, which represents a typical application circuit, and allows testing of all the functions of the PM6686 device. The demonstration kit provides two switching sections with 5 V (OUT1) and 3.3 V (OUT2) outputs from 8 V to 28 V input battery voltage. The operating switching frequency of the two sections is 400 kHz and 300 kHz, respectively. Each switching section delivers more than 5 A of output current. An internal linear regulator can provide 5 V at 100 mA peak current. The charge pump circuit provides an auxiliary 12 V output voltage.

This application note presents the circuit diagram and design details of the VIPER27LN demonstration board, which provides a wide range input voltage (90 V-265 V) and 5 V-12 W output power for auxiliary power applications in consumer applications such as LCD or plasma TVs, some models of DVD recorders, set-top boxes with hard disk, as well as desktop computers.