Mid-Voltage MOSFETs Enhance Synchronous

Rectification in SMPS Designs

Designers of AC-DC power systems need cost-effective power supply solutions

that minimize board space while increasing efficiency and reducing power dissi-

pation. Power density and light-load efficiency improvement are also key issues.

mid-voltage power MOSFET portfolio of optimized power switches meets these

needs. The family combines a small gate charge (Q

charge (Q

ing speeds. Available in a 40V, 60V and 80V rating, these devices require less

snubber circuitry due to an optimized soft-body diode that reduces voltage spikes

by up to 15% over the competitor’s solution.

The first devices available include the 40V FDMS015N04B and 80V

FDMS039N08B available in a Power56 package, and the 60V FDP020N06B

and 80V FDP027N08B available in a TO-220 3-lead package.

Advantages

• Smallerpackagesize

(Power56andTO-2203-lead)

withmaximumthermal

performancetosystemsize

• LowerQ

drivingloss

• LowQ

preventundesirableturn-on,

improvingsystemreliability

• Lowdynamicparasitic

capacitancestoreducegate

drivinglossforhigh-

frequencyapplications

Applications

• Synchronousrectification

forserver/telecomPSU

• Batterychargerand

batteryprotectioncircuit

• DCmotordrivesand

uninterruptiblepower

supplies

• Microsolarinverter

For more information, please visit:

fairchildsemi.com/products/mosfets/powertrench.html

fairchildsemi.com/pf/FD/FDMS015N04B.html

fairchildsemi.com/pf/FD/FDMS039N08B.html

fairchildsemi.com/pf/FD/FDP020N06B.html

fairchildsemi.com/pf/FD/FDP027N08B.html

FDP027N08B

Competitor A

Test condition: V

180

134.1

169.2

160

140

120

100

80

60

40

20

0

FDP027N08B

Competitor B

Test condition: V

350

269.7

323.5

300

250

200

150

100

50

0

Benchmarking of Reduced Reverse Recovery

Charge (Q

Product Number

B

R

Q

Package

FDP020N06B

60

2

204

TO220

FDP027N08B

80

2.7

137

TO220

FDMS039N08B

80

3.9

77

PQFN56

FDMS015N04B

40

1.5

87

PQFN56