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AN-4158 Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part # AN-4158
Description  Symmetric Dual N-Channel Shielded Gate PowerTrench
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

AN-4158 Datasheet(HTML) 6 Page - Fairchild Semiconductor

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AN-4158
APPLICATION NOTE
© 2013 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 5/14/13
6
Figure 14.
Thermal Performance at VIN=48 V,
VOUT=3.3 V, IOUT=30 A, fSW=200 KHz, TA=25°C and
Natural Convention
Telecommunication brick DC-DC converters require the
wide input voltage from 36 V to 75 V, so selecting a well-
balanced RDS(ON) and Qg MOSFET is the critical design step.
The maximum load efficiencies of the FDMS8090, with
input voltages 36 V, 48 V, and 75 V are 87.25%, 88.78%,
and 88.82%, respectively.
Conclusion
It is essential that telecommunication brick DC-DC
converters have higher efficiency and more power density.
Shielded-gate PowerTrench
®
MOSFETs, such as the
FDMS8090 with its well-balanced RDS(ON) and Qg in the
symmetric dual N-channel Power56 package, are able to
improve the efficiency and power density of half-bridge
DC-DC converter in the limited size.
Authors
SungJin Kuen - Applications Engineer (Sungjin.Kuen@fairchildsemi.com)
Dongsup Eom - Applications Engineer (Dongsup.Eom@fairchildsemi.com)
References
[1] SungJin Kuen, Dongsup Eom, Joe Yedinak; “Mid-Voltage Shielded PowerTrench® MOSFET in High Step-Up DC-DC
for Edge-Lit LED TV Backlighting” Fairchild Application Note AN-9763.
Related Resources
FDMS8090 — PowerTrench® Power Stage 100 V Symmetric Dual N-Channel MOSFET: 100 V, 10 A, 13 mΩ N-Channel
AN-9763 — Mid-Voltage Shielded PowerTrench® MOSFET in High Step-Up DC-DC for Edge-Lit LED TV Backlighting
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS
PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1.
Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, or (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in significant injury to the user.
2.
A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
106.1°C


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