Tuesday, September 27, 2011

High Efficiency Step Down Isolated Supply

60W AC-DC adapter, synchronous rectification, fixed frequency current mode PWM controller. Very Low Quiescent Burden, Efficiency above 85%. That's Green.

STMicroelectronics - EVALSTSR30-60W. Synchronous rectification using L6668 and STSR30.

EVALSTSR30-60W: 60W AC-DC adapter

EVALSTSR30-60W: 60W AC-DC adapter

The converter works in both Continuous and Discontinuous conduction mode depending on the input voltage (the circuit has a wide input voltage range) and the output load. The 68-kHz switching frequency provides a good compromise between the transformer size and the harmonics of the switching frequency, optimizing input filter.

The input section includes protection elements (varistor, fuse and NTC for inrush current limiting), a standard Pi-filter for EMC suppression, a bridge and an electrolytic bulk capacitor as the front-end AC-DC converter. The transformer is a layer type, uses a standard ETD34 ferrite core and is designed to have a reflected voltage of 95V. The power MOS is a 700V - 1Ω and a transil clamp network is used for leakage inductance demagnetization.

From STMicroelectronics

Thursday, September 22, 2011

PC-Based Logic Analyzer - Intronix

The LogicPort provides 34 channels sampled at 500MHz. This includes two state-clock inputs which function as normal sampled channels in timing-mode. The LogicPort is controlled and powered via your PC's USB 1.1 or 2.0 port for the ultimate in convenience and portability.

PC-Based Logic Analyzer - Intronix

PC-Based Logic Analyzer - Intronix

The LogicPort's software includes interpreters for CAN, I2C, Synchronous Serial (SPI) and Asynchronous Serial (RS232) protocols. Its Synchronous Serial interpreter is very flexible and interprets 3-Wire, Microwire, PS/2 and other proprietary protocols in addition to SPI.

Feaures Include
  • Real-Time Sample Compression
  • 500MHz Timing-Mode (Internal Clock)
  • 200MHz State-Mode (External Clock)
  • Advanced Multi-Level Triggering
  • Built-in 300MHz Frequency Counter
  • CAN, I2C, SPI and RS232 Interpreters
Intronix is developing high-performance PC-based test instruments. They started as a ATE solutions provider. Automated test equipment and systems (ATE) are PC based Advanced T&M Interfaces.

Intronix Test Instruments, Inc.
2630 E. Mohawk Ln. Unit 144, Phoenix, Arizona 85050, USA.