power management product selection guide - International Rectifier
power management product selection guide - International Rectifier
power management product selection guide - International Rectifier
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AC-DC Sync Rectification IC and MOSFETs | PRODUCT FAMILIES<br />
APPLICATION EXAMPLE:<br />
120W laptop adaptor (16.5V, 6.15A)<br />
‘No heatsink’ redesign<br />
Old Current Transformer vs. New Smart<strong>Rectifier</strong><br />
120W Laptop Adaptor<br />
(VOUT=19.5V, IOUT=6.15A, Full Load, 110VACIN, TAMB=45°C)<br />
New ‘Smart <strong>Rectifier</strong>’<br />
Design = 88% Efficiency<br />
No heatsink<br />
1 x IR1167<br />
+ 2 x SO8 FETs<br />
+ 3 x Res & Cap<br />
(SO8 MOSFETs<br />
are IRF7953<br />
18mΩ, 100V)<br />
Original ‘CT’ Design = 87% Efficiency<br />
1 x Heatsink<br />
+ 2 x TO-220 FETs<br />
+ 1 x Current<br />
Transformer<br />
+ 1 x extra winding<br />
+ 6 x bolts/nuts/<br />
washers<br />
18 x transistors,<br />
resistors and<br />
capacitors<br />
Flyback Example<br />
• No manual assembly<br />
• Less space needed … can redesign<br />
to increase <strong>power</strong> density!<br />
• 120W laptop adaptor (19.5V, 6.15A) with current transformer (CT)<br />
and TO-220 SR FETs.<br />
• Smart<strong>Rectifier</strong> shows 1% efficiency improvement .<br />
• 10°C lower FET temperature with same heatsinking.<br />
• Allows reduction in SR FETs to allow system cost reductions.<br />
www.irf.com INTERNATIONAL RECTIFIER / POWER MANAGEMENT SELECTION GUIDE 13
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