FAN3213T

AN-6069 FAIRCHILD | Alldatasheet

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discrete and integrated driver designs, are discussed. performance of drivers on the lab bench. switch the devices in the sub-100ns timeframe desired. effective MOSFET drive level. communication across the power supply isolation boundary. specific to transformer drive, discussed later. capability of drivers on the lab bench. ramps up in a linear fashion to store energy in the inductor. maintain current constant during the switching interval. Figure 1. Simplified Boost Converter

© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com Conclusion Low-side drivers are used to drive power MOSFETs in applications including clamped inductive load switching, synchronous rectifier circuits, and pulse/gate transformer drive circuits. The relationship of gate drive current to the MOSFET switching and transition intervals has been detailed during the prominent MOSFET switching intervals. Potential driver solutions; including discrete components, integrated PMOS/NMOS, and compound drivers, were examined. Some of the non-ideal characteristics of the various driver circuits were highlighted. There is not a simple unified method to characterize the output current sink and source capability of the many types of drivers available. The test circuits presented in this note can be used to investigate the V OUT vs. IOUT capability of discrete and integrated circuit drivers, enabling evaluation and comparison of drivers for a range of applications. References [1] 2006 Fairchild Power Seminar Topic, “Understanding Modern Power MOSFETs,” available on the fairchildsemi.com website at the link: http://www.fairchildsemi.com/powerseminar/pdf/understanding_modern_power_mOSFETs.pdf [2] Oh, K. S., “MOSFET Basics”, July, 2000, available as AN9010 from the fairchildsemi.com website. [3] Balogh, L. “Design and Application Guide for High Speed MOSFET Gate Drive Circuits,” Power Supply Design Seminar SEM-1400, Topic 2, Texas Instruments Literature No. SLUP169. [4] ICE Components Gate Drive Transformer Datasheet “GT03.pdf” dated 10/06, available from www.icecomponents.com. [5] 2006 Fairchild Power Seminar Topic, “Practical Power Application Issues for High Power Systems,” available on the fairchildsemi.com website at the link: http://www.fairchildsemi.com/powerseminar/pdf/practical_power_high_power_systems.pdf Author Mark Dennis was born in Troy, NC, and received the Bachelor of Engineering degree from Duke University in 1983. After graduation he has worked in industries encompassing power el ectronics applications such as offline and DC to DC power supply design for telecom and computer systems, high voltage supplies for electrostatic precipitators, and online UPS systems. For over eight years Mark has been working in the semiconductor industry and he is employed by Fairchild Semiconductor as a Staff Engineer working in High Power Systems.

© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com Related Parts Type Part Number Gate Drive(1) (Sink/Src) Input Threshold Logic Package Single 1A FAN3111C +1.1A / -0.9A CMOS Single Channel of Dual-Input/Single-Output SOT23-5, MLP6 Single 1A FAN3111E +1.1A / -0.9A External (2) Single Non-Inverting Channel with External Reference SOT23-5, MLP6 Single 2A FAN3100C +2.5A / -1.8A CMOS Single Channel of Two-Input/One-Output SOT23-5, MLP6 Single 2A FAN3100T +2.5A / -1.8A TTL Single Channel of Two-Input/One-Output SOT23-5, MLP6 Dual 2A FAN3216T +2.4A / -1.6A TTL Dual Inverting Channels SOIC8 Dual 2A FAN3217T +2.4A / -1.6A TTL Dual Non-Inverting Channels SOIC8 Dual 2A FAN3226C +2.4A / -1.6A CMOS Dual Inverting Channels + Dual Enable SOIC8, MLP8 Dual 2A FAN3226T +2.4A / -1.6A TTL Dual Inverting Channels + Dual Enable SOIC8, MLP8 Dual 2A FAN3227C +2.4A / -1.6A CMOS Dual Non-Inverting Channels + Dual Enable SOIC8, MLP8 Dual 2A FAN3227T +2.4A / -1.6A TTL Dual Non-Inverting Channels + Dual Enable SOIC8, MLP8 Dual 2A FAN3228C +2.4A / -1.6A CMOS Dual Channels of Two-Input/One-Output, Pin Config.1 SOIC8, MLP8 Dual 2A FAN3228T +2.4A / -1.6A TTL Dual Channels of Two-Input/One-Output, Pin Config.1 SOIC8, MLP8 Dual 2A FAN3229C +2.4A / -1.6A CMOS Dual Channels of Two-Input/One-Output, Pin Config.2 SOIC8, MLP8 Dual 2A FAN3229T +2.4A / -1.6A TTL Dual Channels of Two-Input/One-Output, Pin Config.2 SOIC8, MLP8 Dual 2A FAN3268T +2.4A / -1.6A TTL 20V Non-Inverting Channel (NMOS) and Inverting Channel (PMOS) + Dual Enables SOIC8 Dual 2A FAN3278T +2.4A / -1.6A TTL 30V Non-Inverting Channel (NMOS) and Inverting Channel (PMOS) + Dual Enables SOIC8 Dual 4A FAN3213T +2.5A / -1.8A TTL Dual Inverting Channels SOIC8 Dual 4A FAN3214T +2.5A / -1.8A TTL Dual Non-Inverting Channels SOIC8 Dual 4A FAN3223C +4.3A / -2.8A CMOS Dual Inverting Channels + Dual Enable SOIC8, MLP8 Dual 4A FAN3223T +4.3A / -2.8A TTL Dual Inverting Channels + Dual Enable SOIC8, MLP8 Dual 4A FAN3224C +4.3A / -2.8A CMOS Dual Non-Inverting Channels + Dual Enable SOIC8, MLP8 Dual 4A FAN3224T +4.3A / -2.8A TTL Dual Non-Inverting Channels + Dual Enable SOIC8, MLP8 Dual 4A FAN3225C +4.3A / -2.8A CMOS Dual Channels of Two-Input/One-Output SOIC8, MLP8 Dual 4A FAN3225T +4.3A / -2.8A TTL Dual Channels of Two-Input/One-Output SOIC8, MLP8 Single 9A FAN3121C +9.7A / -7.1A CMOS Single Inverting Channel + Enable SOIC8, MLP8 Single 9A FAN3121T +9.7A / -7.1A TTL Single Inverting Channel + Enable SOIC8, MLP8 Single 9A FAN3122T +9.7A / -7.1A CMOS Single Non-Inverting Channel + Enable SOIC8, MLP8 Single 9A FAN3122C +9.7A / -7.1A TTL Single Non-Inverting Channel + Enable SOIC8, MLP8 Notes: 1. Typical currents with OUTx at 6V and V DD=12V. 2. Thresholds proportional to an externally supplied reference voltage. To review the datasheets for the above low-side gate drivers, visit Fairchild Semiconductor’s website at: http://www.fairchildsemi.com/sitesearch/fsc.jsp?command=eq&attr1=AAAFamily&attr2=Low-Side+Drivers

© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com 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.