Primary-side switcher

8 October 2014 Power Electronics / Power Management

Diodes Incorporated has announced the AP3988 off-line, side-switching controller designed to cut costs and improve power supply performance in chargers, ADSL adaptors and home appliances. By providing primary-side control, the device eliminates the requirement for optocouplers and secondary-side control circuitry, reducing component count, board space requirements and cost.

Primary-side regulation results in higher efficiency with less heat generated in the power supply, which increases reliability. Additional benefits include improved output voltage and current accuracy, enhanced over-voltage and short circuit protection, and better EMC performance achieved by frequency dithering.

The AP3988 regulates output voltage using piece-wide pulse frequency modulation, in which analog levels are represented as fixed-duration pulses of varying repetition rate. Transistors with 700 VCBO are built into the device and startup current is typically just 0,2 μA.

The chip has integral cable voltage drop compensation of 5% of nominal voltage and adjustable line voltage compensation. It is designed for use in 5,5 W adaptors and is offered in the SO-7 package.

For more information contact Arnold Perumal, Avnet Kopp, +27 (0)11 319 8600, arnold.perumal@avnet.eu, www.avnet.co.za

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...

---