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AN-4158 Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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AN-4158 Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 6 page 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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