STMicroelectronics Manuals

120VAC input-Triac dimmable LED driver

ST2S06 is a dual synchronous step-down DC-DC converter optimized for powering low-voltage digital cores in ODD applications and, generally, used to replace the high current linear solution when the power dissipation may cause a high heating of the application environment. It provides up to 0.5 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency (1.5 MHz) allows the use of tiny surface-mount components. A resistor divider to set the output voltage value, an inductor and two capacitors are required for every channel. In addition, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors. The device is thermal protected and current limited to prevent damage due to accidental short-circuit. The family is available in the QFN12L (4x4 mm) package.

This document provides an introduction to the LLC resonant half-bridge converter, its operation, and its benefits. It is suitable for applications such as TVs and PCs.

AN2627 application note introduces the ST8R00 family of synchronous step-up DC-DC converters, which provide up to 1A current output, input voltage range of 4V to 6V, output voltage range of 6V to 12V, switching frequency of 1.2MHz, high switching frequency, can use surface mount small components, use resistor divider to set output voltage value, need inductor and two capacitors, low ESR surface mount ceramic capacitors ensure low output ripple, ST8R00 series converters have two versions, continuous mode ST8R00W and pulse mode ST8R00.

This document describes a high-frequency synchronous 900 kHz step-down converter based on the ST1S10. It is suitable for powering high-voltage LCD applications and low-voltage digital core HDD applications. The converter provides up to 3 A of output current over an input voltage range of 2.5 V to 18 V. It utilizes synchronous rectification to eliminate the need for an external Schottky diode. The high internal switching frequency of 0.9 MHz allows for the use of small surface-mount components and a resistor divider to set the output voltage. Only an inductor and 3 capacitors are required. The converter operates in current PWM mode and provides stable operation with low output ripple using low E.S.R SMD ceramic capacitors. To maximize power conversion efficiency in light load conditions, the converter can automatically switch to burst mode. It can operate in PWM mode at a fixed frequency or synchronize with an external frequency. The switching frequency is 900 kHz when SYNC is connected to ground or a fixed voltage below 5.5 V, and it can be synchronized between 400 kHz and 1.2 MHz using an external clock applied to SYNC. The converter includes a thermal shutdown circuit that activates at 150 °C and cycle-by-cycle current limitation for protection against shorted outputs.

AN2559 is a system power supply board reference design for powering digital applications, such as CPUs, FPGAs, memories, etc.

This article describes the method of designing a low-cost power supply using VIPer12/22A-E in a buck configuration. The power supply is suitable for many applications and can provide power for 12V and 16V outputs. The design features the lowest possible component count, integrated thermal overload protection, approximately 200mW of no-load consumption, and efficiency measured between 70% to 80%.

AN2521 is ST's application note, introducing a 75W wide range input mains and power-factor-corrected ac-dc adapter evaluation board. Its electrical specification is tailored to a typical high-end portable computer power adapter. The distinctive attributes of this design are the very low standby input consumption (< 0.3 W at 265 V), the excellent global efficiency (> 85%) for a two stage architecture and the low cost.

This application note describes the performances of a 400W reference board, with wide-range mains operation and power-factor-correction (PFC) and presents the results of its bench evaluation. The electrical specification refers to a power supply for general purpose application, with two main output voltages (200 V and 75 V). The main features of this design are the very low no-load input consumption (<0.5 W) and the very high global efficiency, better than 90% at full load and nominal mains voltage (115 - 230 VAC).

AN2507 is a ST application note that describes the design of a high power flash LED driver using the STCF03 chip.

AN2492 is an application note about the 400W L6599-based HB LLC resonant converter for PDP application. The note describes the performance, electrical specification, circuit description and electrical test results of the converter.

This application note describes the STEVAL-TSP001V1 demonstration board for the evaluation of a power over Ethernet (PoE) system used to transmit electrical power, along with data, to remote devices over a standard twisted-pair cable in an Ethernet network. A complete power solution for Ethernet-connected powered devices is presented. The power supply fully complies with IEEE 802.3-2005 PoE specifications and delivers the rated output from any compliant source. Example outputs of 3.3 V and 12 V are given in this document, but other requirements can easily be met by implementing small changes.

This application note describes an evaluation board based on the Transition-mode PFC controller L6563 and presents the results of the bench evaluation. The board implements a 400 W, wide-range mains input, a PFC pre-conditioner suitable for ATX PSU, or a flat screen display.