PDF SRM4010 Data sheet ( Hoja de datos )

Número de pieza	SRM4010
Descripción	40A Synchronous Rectifier Module
Fabricantes	Microsemi Corporation
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No Preview Available ! COLORADO DIVISION SRM4010 40A Synchronous Rectifier Module DESCRIPTION The SRM4010 Module is a complete solution for implementing very high efficiency Synchronous Rectification and eliminates many of the problems with self- driven approaches. The module connects to the transformer secondary of a Forward Converter to provide complete high current rectification at output voltages ranging from 5 volts down to 1.0 volt, in a thermally efficient surface mount package. Rectification Efficiency as high as 95% is achieved by avoiding cross conduction. Dedicated Ics provide effective Gate drive of the ultra low Rds(on) MOSFETs used in the module. In conventional self-driven approaches, the MOSFET drive ends as soon as the power transformer finishes resetting. This causes increased losses as the duty cycle decreases. The SRM4010 control circuitry drives either the Forward or the Catch MOSFET over virtually the entire duty cycle. Only a small prediction time, typically 100 ns, is needed to avoid cross conduction. The SRM 4010 is designed to handle large sudden changes in duty cycle. This makes the module suitable for current mode control applications, with large load changes where high bandwidth is needed. Proprietary prediction circuitry eliminates cross conduction for sudden large changes in pulse width. The module is self-powered from the transformer secondary winding and operates over a wide range of peak transformer voltages and PWM frequencies. A 5-Volt Linear Regulator is also available as a power supply for other secondary side circuitry such as powering opto coupler feedback. In very low voltage applications where the peak transformer voltage is not high enough for powering the modules, secondary power can be provided to the regulator from an additional transformer winding. The High Current Surface Mount Package has Low Inductance, and robust terminals for superior regulation and low noise susceptibility in high load current transients. The Module has an isolated base and is designed for direct PCB mounting with the terminals formed within the package. The base-plate of the module allows heat to be dissipated by the PCB etch, or a mechanical http://www.DataSheet4U.net/ sink attachment through the PCB for higher power applications. PRODUCT HIGHLIGHT KEY FEATURES Easy to use Surface Mountable Solution for up to 40A Very High Rectification Efficiency at Output Voltages from 5V down to 1V Integrated Solution with few external parts saves Board Space Robust Package with Copper Base-Plate provides Effective Heat Distribution 5 Volt Linear Regulator available to power Secondary side Circuitry Suitable for converters that operate at light load Avoids problems with parallel operation that plague simple self-driven schemes Operates at PWM Frequencies ranging from 200 to 400KHz APPLICATIONS High Current Isolated DC-DC Converters Distributed Power Architectures CPU Power Supply off 48VDC Bus PACKAGE VIN 48 to 150V PWM Controller FWD CTCH SRM4010 5V REG PGND OPTO Feedback VOUT 1 to 5V Copyright 2000 2003-02-05 Rev. IR Figure 1 Microsemi Colorado Division 800 Hoyt Street, Broomfield, CO. 80020, 303-469-2161, Fax: 303-466-3775 Figure 2 Page 1 datasheet pdf - http://www.DataSheet4U.net/ 1 page COLORADO DIVISION SRM4010 40A Synchronous Rectifier Module THEORY OF OPERATION General Description The SRM4010 contains two power MOSFETs that act as low loss rectifiers. The proprietary control Ics operate these MOSFETs as synchronous rectifiers in circuit that maximizes efficiency and eliminates cross conduction. The SRM4010 has an internal 5 volt linear regulator that powers the internal control circuitry and can also provide a power source that can be used for external control circuitry. This is especially useful in low voltage outputs where the output is not high enough to power the secondary-side control directly for the output Continuous/Heavy Load Operation Continuous conduction is the mode of operation where there is always current flowing in the output inductor. This is the normal mode of operation in most forward converters in medium to high power applications. During the conduction period (on-time) of the primary-side Switch (usually a MOSFET), the Catch MOSFET in the module is off and the current is flowing from the transformer to the output inductor, output capacitor and the load. The load current returns though the forward MOSFET in the module to the negative secondary terminal of the power transformer. The transformer voltage applied to the Catch MOSFET in the module must be below the 20V maximum rating in this mode of operation. As the primary-side switch turns off, the transformer current goes to zero and the voltage on Pin 1 of the module falls to zero driven by the current stored in the output inductor. In this mode, the current is carried through the Catch MOSFET body diode momentarily, then the MOSFET is turned on allowing reduced forward voltage drop. The time of body diode conduction is very short, typically less than 50 nS. The transformer voltage on Pin 2 goes positive, driven by the transformer magnetizing current. This allows the transformer to reset, keeping volt-second balance on the core. The exact shape of this waveform is dependent on the details of the primary side of the power converter and whether there is a turn-off snubber on the primary-side switch. Since a transformer cannot support dc voltage, the area of the ON time and the OFF time are equal. This occurs automatically. After reset, the transformer voltage actually changes sign causing a slight forward bias of the body diode in the forward MOSFET. This voltage is typically –0.5 volts, however, since there is almost no current flowing during this time, there is no significant power loss. When the primary-side switch turns on, the internal control circuitry turns off the Catch MOSFET slightly before the rise of the voltage and also turns on the forward MOSFET. http://www.DataSheet4U.net/ Copyright 2000 2003-02-05 Rev. IR Figure 6 Microsemi Colorado Division 800 Hoyt Street, Broomfield, CO. 80020, 303-469-2161, Fax: 303-466-3775 Page 5 datasheet pdf - http://www.DataSheet4U.net/ 5 Page COLORADO DIVISION SRM4010 40A Synchronous Rectifier Module Layout Guidelines The SRM4010 is designed to simplify the PCB layout. The SGND is common to the PGND inside the device. SGND should be kept separate from the PGND unless the PGND can be made large in area to have small inductance. The SGND is the intended reference for the external tailoring parts. The baseplate can be made common with the PGND plane and used to spread heat. One technique that works well is to have the PGND plane on the layer immediately under the SRM4010 and flood the plane around the leads 4, 5, 7, 8 and 9. The plane would connect to pins 3 and 6. Surface mount parts can then used for the added parts on 7, 8 and 9. Care must be given to the resistance of traces on the output interconnects. It is easy to have trace losses that are equal to or higher than the conduction losses in the module. If high efficiency is desired, close attention needs to be paid to this. The conductors often need to be duplicated on multiple layers. Demo Board A dedicated fully operational board is available to demonstrate the operation of the SRM 4010. The board contains a standard commercially available PWM controller. The board is designed to operate at 48v input and 3.3v output levels. The inductor is a pair of surface mount transformers a 9:2 turns ratio which gives a 10v secondary voltage swing from a 48v input. These inductors are suitable for low volume sampling and development. Volume production using optimized planar inductors with the SRM4010 will have a typical converter efficiency 1% - 2% higher than the demonstration board’s efficiency. http://www.DataSheet4U.net/ Copyright 2000 2003-02-05 Rev. IR Microsemi Colorado Division 800 Hoyt Street, Broomfield, CO. 80020, 303-469-2161, Fax: 303-466-3775 Page 11 datasheet pdf - http://www.DataSheet4U.net/ 11 Page

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Número de pieza	Descripción	Fabricantes
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