Previous Page  77 / 84 Next Page
Information
Show Menu
Previous Page 77 / 84 Next Page
Page Background

new products

and simplifies the design of LLC power supplies.

The FAN6248 is an ideal solution for modern, high-

performance, power supply units (PSU) where high

levels of reliability and efficiency are required in a small

space. Typical applications include server and desktop

computing , gaming, large screen LCD TV and OLED TV,

networking, telecom and LED lighting applications.

The device incorporates an advanced, mixed, SR control

methodology combining instantaneous drain voltage

detection with previous switching cycle information. The

separate 100 V rated sense inputs accurately sense the

drain and source voltages across the two SR MOSFETs,

allowing for any asymmetries or poor coupling in the

secondary winding. With this advanced control approach,

the FAN6248 prevents current inversion and avoids SR

mis-triggering due to capacitive current spikes, giving

highly reliable operation. The anti-shoot-through control

within the controller enhances the reliability of the PSU

and prevents potentially destructive simultaneous turn on

of the two SR MOSFETs.

The FAN6248 and just two external resistors and

MOSFETs delivers a simple LLC converters supporting

up to 800 W. In particularly noisy environments, adding

two capacitors further enhances system stability. The

FAN6248 operates reliably and efficiently across a wide

range of power levels. Above resonance operation is

achieved without the introduction of voltage spikes. At

no load, the FAN6248 enters green mode and disables

itself. During light load conditions, the controller pulses

within green mode giving very efficient power delivery as

required by efficiency standards such as 80 PLUS®, DoE

VI, and CoC Tier 2.

Inbuilt adaptive parasitic inductance compensation also

minimizes body diode conduction in the SR MOSFETs

due to its package’s stray inductance, thereby increasing

PSU efficiency. There are four devices within the series;

power supply designers are able to select the most

appropriate for their application based upon switching

frequency (either 25 kHz-70 kHz or 60 kHz-700 kHz)

and the level of stray inductance associated with the

MOSFET. The range is suitable for use with MOSFETs

in TO-220, D2PAK, DPAK or PQFN package styles.

Furthermore, the 10.5 V high gate drive output from the

FAN6248 ensures the ability to drive these very wide

range of MOSFETs.

“The FAN6248 comprehensively addresses the needs

of modern LLC PSU designers. Innovations such as

the mixed control methodology and adaptive parasitic

inductance compensation ensure reliable and highly

efficient operation.” said Shane Chilton, General Manager

of the Power Conversion Solutions at ON Semiconductor.

“With only two resistors and MOSFETs required to realize

an advanced state-of-the-art LLC converter the controller

will prove popular with all engineers that are designing

for applications that require high levels of performance.”

Design support is available from ON Semiconductor,

including a 240 W evaluation board incorporating a

complete LLC design. A daughter board is also available

to incorporate the FAN6248 into existing designs. Please

contact your ON Semiconductor sales representative to

request evaluation boards.

Sensors from TT Electronics offer accuracy

and longevity for critical applications

TTElectronics, a global provider of engineered electronics

for performance critical applications, today launched

the PHS family of rotary position sensors that provide

precision sensing in harsh environments and in critical

applications where repair costs would be be high in the

case of a failure. The hollow shaft single turn position

sensors have been designed and built to embrace three

main design points; precision, robustness and reliability.

The rotary sensors comprise three separate series named

PHS04, PHS07 and PHS11. They convert angular

mechanical position or the motion of a shaft or axle to an

analogue or digital electrical signal and are designed for

applications that require adjustments to control variable

outputs such as position, speed or volume.

New-Tech Magazine Europe l 77