PWM controller set to replace FETs in smartphone power supplies
1 min read
Designed for use in smartphone and tablet power supplies, Dialog Semiconductor's new pwm controller, the iW1679, is said to cut bom costs by up to 10% compared to FET based designs.
The device uses Dialog's patented digital control technology to actively modulate the BJT base current drive, optimising performance and improving efficiency by keeping the BJT out of saturation.
As a result, the iW1679 provides an active average efficiency of 83%, maintains high efficiency at loads as light as 10% and achieves <30mW no load standby power with fast standby recovery time.
"The use of BJTs is prevalent in 5W and lower power supplies," said Ron Edgerton, vp and general manager of Dialog's Power Conversion business group. "With the iW1679, we are applying this extensive knowledge to bring the same low cost, high efficiency and performance benefits to higher power applications."
The iW1679 also features Dialog's EZ-EMI technique to further reduce EMI, simplify manufacturing and minimise the need for external EMI filtering components.
Additional bom cost savings come from Dialog's patented PrimAccurate primary side control technology, which it says eliminates the need for a secondary side regulator and optical feedback isolator.
