Smart Linear Regulator Boasts High Efficiency and Power Density

Texas Instruments (TI) has expanded its portfolio of linear regulators by introducing a smart AC/DC linear regulator. With 75 percent higher efficiency and two times the power density of other linear regulators, this device achieves the best balance between high efficiency and ultra-low noise while shrinking power-supply size. The fully integrated TPS7A78 linear regulator uses a unique switched-capacitor architecture to eliminate discrete components, including external inductors and transformers and miniature circuit breakers and interrupters, for tamper-resistant designs in applications including electronic metering in grid infrastructure and building automation.

The TPS7A78 is a non-isolated linear regulator that delivers up to 0.5 W from AC to DC with smaller, fewer components. This smart design optimizes regulation through an active bridge, switch capacitor and integrated low-dropout regulator (LDO). This design results in higher efficiency and a reduced capacitor size compared to linear regulators in traditional capacitor-drop solutions utilizing a Zener diode.


Key features and benefits of the TPS7A78:

Low standby power: A unique dynamic active bridge clamp pre-regulates the input voltage for optimal performance to reduce standby power to 10 mW, which is up to 75% lower compared to traditional capacitor-drop solutions.

Higher power density: The switched-capacitor architecture eliminates up to 26 discrete components, including the bridge rectifier. This architecture reduces capacitor size by 25% compared to traditional capacitor-drop solutions.

Tamper-proof design: The TPS7A78 is free of costly magnetic shielding, thus meeting the International Electrotechnical Commission (IEC) 61000-4-8 standard required by applications such as electronic metering.

Available through the TI store and authorized distributors, the TPS7A78 is offered in a 14-pin, 5-mm-by-6.5-mm thin-shrink small-outline package (TSSOP) and priced in small reels at US$1.00 in 1,000-unit quantities.

Texas Instruments |


Building Automation LON-IP Standard Earns ANSI/CTA Approval

The Consumer Technology Association(CTA) and LonMark International have announced that the ANSI/CTA-709.7 LON IP is now approved as a new American National Standard (ANS) by the American National Standards Institute (ANSI). The new standard focuses on the interoperability of Internet of Things (IoT) devices and provides a complete model for implementing LON IP device-to-device and device-to-application communication interoperability.
This new standard will provide multiple parties – including users, developers, vendors, integrators and specifiers of open building control systems – a mechanism to develop and deliver a higher level of interoperability using native Ethernet/IP based devices. The new standard describes the complete set of requirements for vendors to develop LON devices with native IP communications, which offers higher speed and better IT integration flexibility. As more building control networks require more data and more IoT application interfaces, this new media type for LON control networks provides all of the benefits and functionality to meet this growing demand.

The ANSI/CTA-709.7 Implementation Guidelines define the application layer requirements for interoperable devices to communicate directly on Ethernet. It defines the addressing requirements for both IPv4 and IPv6. LonMark will offer full interoperability testing of any device utilizing the new channel type. The standard defines all of the timing parameters, configuration, and interface requirements to the full 709.1 protocol stack.

A few years prior the ANSI/CTA-709.6 Application Elements built upon the ANSI/CTA-709.5 Implementation Guidelines by providing a catalog of more than 100 common device profiles, with more than 380 specific implementation options. These profiles define the mandatory and optional design requirements for standard data variables, standard configuration properties, enumeration types and standard interface file requirements. This extensive library of device profiles includes definitions for a broad collection of devices for HVAC, indoor and outdoor (roadway) lighting, security, access, metering, energy management, fire and smoke control, gateways, commercial and industrial I/O, gas detection, generators, room automation, renewable energy, utility, automated food service, semiconductor fabrication, transportation, home appliances and others.

LonMark International |


Highly Integrated, Precision ADCs and DACs Feature Small Footprint

Texas Instruments (TI) has introduced four tiny precision data converters. The new data converters enable designers to add more intelligence and functionality, while shrinking system board space. The DAC80508 and DAC70508 are eight-channel precision digital-to-analog converters (DACs) that provide true 16- and 14-bit resolution, respectively. The ADS122C04 and ADS122U04 are 24-bit precision analog-to-digital converters (ADCs) that feature a two-wire, I2C-compatible interface and a two-wire, UART-compatible interface, respectively. The devices are optimized for a variety of small-size, high-performance or cost-sensitive industrial, communications and personal electronics applications. Examples include optical modules, field transmitters, battery-powered systems, building automation and wearables.

Both DACs include a 2.5-V, 5-ppm/°C internal reference, eliminating the need for an external precision reference. Available in a 2.4-mm-by-2.4-mm die-size ball-grid array (DSBGA) package or wafer chip-scale package (WCSP) and a 3-mm-by-3-mm quad flat no-lead (QFN)-16 package, these devices are up to 36 percent smaller than the competition. The new DACs eliminate the typical trade-off between high performance and small size, enabling engineers to achieve the best system accuracy, while reducing board size or increasing channel density.

In addition to their compact size, the DAC80508 and DAC70508 provide true, 1 least significant bit (LSB) integral nonlinearity to achieve the highest level of accuracy at 16- and 14-bit resolution – up to 66 percent better linearity than the competition. They are fully specified over a -40°C to +125°C extended temperature range and provide features such as cyclic redundancy check (CRC) to increase system reliability.

The tiny, 24-bit precision ADCs are available in 3-mm-by-3-mm very thin QFN (WQFN)-16 and 5-mm-by-4.4-mm thin-shrink small-outline package (TSSOP)-16 options. The two-wire interface requires fewer digital isolation channels than a standard serial peripheral interface (SPI), reducing the overall cost of an isolated system. These precision ADCs eliminate the need for external circuitry by integrating a flexible input multiplexer, a low-noise programmable gain amplifier, two programmable excitation current sources, an oscillator and a precision temperature sensor.

Both ADC devices feature a low-drift 2.048-V, 5-ppm/°C internal reference. Their internal 2 percent accurate oscillators help designers improve power-line cycle noise rejection, enabling higher accuracy in noisy environments. With gains from 1 to 128 and noise as low as 100 nV, designers can measure both small-signal sensors and wide input ranges with one ADC. These device families, which also include pin-to-pin-compatible 16-bit options, give designers the flexibility to meet various system requirements by scaling performance up or down.

Engineers can evaluate the new data converters with the DAC80508 evaluation module, the ADS122C04 evaluation module and the ADS122U04 evaluation module, all available today for $99.00 from the TI store and authorized distributors.

TI’s new tiny DACs and ADCs are available now with pricing ranging from $3.95 to $9.99 (1,000s).

Texas Instruments |