STMicroelectronics Manuals

This document provides design guidelines for LLC resonant half-bridge converters, including their high efficiency, low EMI emissions, and high power density.

This application note describes a UWR flyback converter that can be used to supply a DSL Multiplexer. The advantage in using a flyback converter in this application is the moderate variation of the duty cycle with the input voltage. The main drawback is the high value of the rms current in the secondary winding, in the output diode and in the output capacitor.

This application note presents the basic equation of the sepic converter, in addition to design guidelines for a sepic PFC operating in transition mode and using the ripple steering technique. An application example with some tests results and waveforms is also provided in the document.

This document describes a 60W adapter application using the L6668 fixed frequency current mode PWM controller and the STSR30 smart driver for flyback synchronous rectification. This chipset guarantees low no-load consumption and high efficiency, making it easy to comply with world-wide mandatory and voluntary energy saving requirements.

One way to minimize the size and complexity of a battery charger is to use a linear-type charger. The linear charger drops the AC adapter voltage down to the battery voltage. The number of external components is low: linear chargers require input and output bypass capacitors, and sometimes need an external pass transistor, and resistors for setting voltage and current limits. The main pitfall of a linear charger is power dissipation. The charger simply drops the AC adapter voltage down to the battery voltage. In the case of an 800mA charger, a 5V±10% regulated AC adapter voltage, and battery voltage that varies between 4.2V and 2.5V, the power dissipation can range from 0.6W to 2.0W. This type of charger is simpler than the switch-mode type, mainly because the passive LC filter is not required. It dissipates the most power when the battery voltage is at its minimum, since the difference between the fixed input voltage and the battery voltage is greatest during this condition.

This application note describes the performance of a 200 W reference board with wide-range mains operation and power-factor-correction (PFC). Its electrical specification is tailored to a typical high-end application for LCD TV or monitor applications. 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 87% at full load and nominal mains voltage (115-230 Vac). The circuit consists of three main blocks; the first is a front-end PFC pre-regulator based on the L6563 PFC controller. The second stage is a multi-resonant half-bridge converter whose control is implemented through the STMicroelectronics L6599 resonant controller. A further auxiliary flyback converter based on the VIPer12A-E off-line primary switcher completes the architecture. This third block is mainly intended for microprocessor supply and display power management operations.

The STM1403/1404 is a family of low power intrusion (tamper) detection security supervisors for the Point of Sale (POS) terminal market. They enable manufacturers to meet security standards such as FIPS-140 (NIST, US Dept. of Commerce), EMV Co, ISO, ZKA (Germany) and Visa PED. Until recently, many of these intrusion detection functions were implemented by using several discrete devices. The STM1403/1404 integrates all these functions into a small profile security-friendly QFN package. The STM1403/1404 meets most price, performance and board space objectives while ensuring customers are able to meet current and future security certification requirements for physical and environmental tamper detection.

One way to minimize the size and complexity of a battery charger is to use a linear-type charger. The linear charger drops the AC adapter voltage down to the battery voltage. The number of external components is low: linear chargers require input and output bypass capacitors, and sometimes need an external pass transistor, and resistors for setting voltage and current limits. The main pitfall of a linear charger is power dissipation. The charger simply drops the AC adapter voltage down to the battery voltage. In the case of a 0.8 A charger, a 5 V±10% regulated AC adapter voltage, and battery voltage that varies between 4.2 V and 2.5 V, the power dissipation can range from 0.64 W to 2.0 W. This type of charger is simpler than the switch-mode type, mainly because the passive LC filter is not required. It dissipates the most power when the battery voltage is at its minimum, since the difference between the fixed input voltage and the battery voltage is greatest during this condition.

This paper introduces a non-isolated double output dual-buck/boost DC/DC converter topology based on the VIPerX2A family. The proposed topology is a non-isolated transformerless topology using an intermediate tap inductor and transformer. This topology operates in the 88 ~ 265 VAC wide input voltage range and can be used in low power and low cost applications.

This application note introduces the STLD40D, a white LED power supply. It is a switching boost regulator that operates from 3.0 V to 5.5 V and can provide an output voltage as high as 37 V and can drive up to 10 white LEDs in series.

AN2321 is an application note released by ST, introducing a high-performance L6599-based HB-LLC adapter, suitable for laptop computers. This design has very low no-load input consumption(<0.4 W) and very high global efficiency.

This application note is dedicated to the design of a flash LED driver using STCF02, which is a step-up/down current mode converter. Schematic and functional description, recommendations for PCB Layout and external components selection are also evaluated.

AN2300 is an application note published by STMicroelectronics, which introduces a switch power supply design scheme based on the VIPer12A chip. The scheme uses a capacitor to store energy, which can achieve low-cost and high-efficiency switch power supply design.

This application note describes the use of the L5970D/L5973D high intensity LED driver. The driver can operate over a wide range of input voltages to drive a series of LEDs, providing efficient energy source.