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A wide product range of the new FDmesh series of high-voltage N-channel MOSFETs is now in full production. The new series adds an exceptionally short body-diode recovery time to the advantages of low on-resistance and fast switching rate already achieved by the existing MDmesh technology.
Due to their extremely fast inherent body diode and their enhanced dv/dt capability, FDmesh MOSFETs are recommended for high-efficiency bridge converters such as Zero Voltage Switching (ZVS) phase-shift topologies. |
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The new FDmesh family brings new levels of performances to high frequency applications like ZVS phase-shift full bridge converters, welding machines, telecommunications and high-end servers.
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On-resistance 3 times lower than standard products
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Gate resistance minimized
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Low Gate charge, a third the size of standard MOSFETs
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Very high dv/dt capability (> 20V/nsec @ di/dt <= 400A/sec)
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Short reverse recovery time (trr)
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Reduced reverse recovery charge (Qrr)
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Rugged avalanche operation
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Lower on-losses than standard MOSFETs
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Input and output capacitance smaller than standard MOSFETs
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Turn-off improvements and reduction in switching losses
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Smaller heatsinks
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Cost saving
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Higher efficiency
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Safe operation in bridge topologies |
 FDmesh employs the basic MDmesh technology plus implanted metal ions (platinum) to shorten the reverse recovery time of the diode, trr. This is defined as the time taken by the current before going to zero after taking on negative values.
A great difference in terms of the diode's recovery time, between the standard STP20NM50 and its FDmesh version, STP20NM50FD, can be seen in the waveforms on the right.
The new FDmesh is unique as none of our direct competitors have devices or similar technology with fast-recovery body diodes. With the usual excellent and superior on-resistance of MDmesh, STW20NM50FD, STW45NM50FD and STP11NM60FD exhibit a far better gate charge, as seen in the table below.
| Company |
P/N |
Package |
VDSS
(V) |
RDS(on) max
(Ohm) |
ID(cont)
@ 25°C
(A) |
Qg typ
@ Vgs=10V
(nC) |
trr
@ 25°C typ
(ns) |
Irrm
@ 25°C typ
(A) |
| ST |
STW20NM50FD |
TO-247 |
500 |
0.25 |
20 |
38 |
175 |
14 |
| IXYS |
IXFH21N50Q |
TO-247 |
500 |
0.25 |
21 |
90 |
250 (max) |
8 |
| ST |
STW45NM50FD |
TO-247 |
500 |
0.11 |
45 |
92 |
230 |
18 |
| IR |
IRFPS40N50L |
TO-247 |
500 |
0.1 |
46 |
380 |
170 |
9 |
| FAIRCHILD |
FQL40N50F |
TO264 |
500 |
0.11 |
40 |
155 |
250 (max) |
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| IXYS |
IXFX44N50Q |
PLU247 |
500 |
0.12 |
44 |
190 |
250 (max) |
10 |
| IXYS |
IXFN48N50Q |
ISOTOP |
500 |
0.1 |
48 |
190 |
250 (max) |
10 |
| APT |
APT5010JFLL |
ISOTOP |
500 |
0.1 |
44 |
92 |
250 (max) |
15 |
| ST |
STP11NM60FD |
TO-220 |
600 |
0.45 |
11 |
28 |
194 |
11.5 |
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