Reference design for flyback AC-DC power supplies
11 August 2004
Power Electronics / Power Management
A reference design for flyback topology AC-DC power supply circuits, commonly found in DVD/CD players, set-top boxes and an array of consumer electronics, is offered by International Rectifier. Using IR's IRIS4009 AC-DC integrated switcher as the main switch and control device, the IRISMPS4 reference design features a universal AC line input and 15 V, 4 A full load DC output.
A dropping resistor from the DC bus initiates start-up current for the IRIS4009. Once the circuit is started, the Vcc power for the IRIS4009 comes from the bias winding of the main transformer. The primary current control circuit consists of a current sensing resistor, which feeds a voltage proportional to the transformer primary current into the feedback pin of the IRIS4009. The secondary voltage control loop uses an LM431 precision shunt regulator as the reference and an optocoupler to feedback the information to the IRIS4009 control circuit.
The IRIS4009 combines a control IC and a low-loss, rugged HEXFET power MOSFET in a single five-pin package for AC-DC power supplies up to 30 W. It is claimed to handle over 60% more power than industry-standard devices classified at the same power level as a result of application-specific silicon and package technologies. Compared to a discrete solution, the IRIS4009 cuts part count and board space by 25%, says IR.
Further reading:
High-precision current transducer
Power Electronics / Power Management
Danisense announces its new high-precision DP12IP current transducer designed for isolated DC and AC current measurement in demanding PCB-mounted power electronics applications.
Read more...
Secure holder for protected 18650 batteries
Power Electronics / Power Management
Designed for protected 18650 batteries up to 70 mm long, the holder offers secure retention for portable, industrial, and embedded applications.
Read more...
More room to scale
Altron Arrow
Power Electronics / Power Management
With the latest STM32H5 lines from STMicroelectronics, you can now scale within the same platform, from a compact 1 Mbyte device to higher-memory MCUs for graphics-rich and feature-heavy designs.
Read more...
Surface mount power amplifier for high-power applications
RF Design
Power Electronics / Power Management
The GNA-63-5W+, from Mini-Circuits, is a GaN MMIC Power Amplifier (PA) designed for demanding RF applications requiring high efficiency, excellent linearity, and a compact footprint.
Read more...
1200 V QSiC modules
Power Electronics / Power Management
SemiQ Inc has launched the QSiC Dual3, a family of 1200 V half-bridge MOSFET modules for motor drives in data centre cooling systems, grid converters in energy storage systems, and industrial drivers.
Read more...
MCOTS transient filter for military applications
RFiber Solutions
Power Electronics / Power Management
SynQor has announced the new MCOTS-F-28-T-HE transient half-brick filter, the latest addition to its MCOTS product family.
Read more...
Expanded range of high-thermal-performance QSiC modules
Power Electronics / Power Management
SemiQ’s half-bridge series for data centre power converters and industrial motor drives features low RDSON SiC MOSFETs and parallel SBD diodes for best-in-class power density and conversion efficiency.
Read more...
Transporting lithium batteries and IoT devices
Power Electronics / Power Management
With billions of rechargeable and non-rechargeable lithium cells and batteries powering most of the world’s consumer and industrial electronic devices, shipping them to customers through vast global logistics chains is often an overlooked topic.
Read more...
Setting a new benchmark for high-power DC load testing
Conical Technologies
Test & Measurement Power Electronics / Power Management
The new ITECH IT8900G/L high-speed, high-power DC electronic load offers a powerful combination of speed, scalability, precision and high-power density.
Read more...
Quality batteries are critical for IIoT
Uniross Batteries
Power Electronics / Power Management
Batteries intended for use in industrial operations must indeed offer complete reliability under extreme environmental conditions, resistance to vibration and harsh environments.
Read more...
printer friendly version