SRM4010 Datasheet, PDF (1/11 Pages) Microsemi Corporation – 40A Synchronous Rectifier Module

COLORADO DIVISION
SRM4010
40A Synchronous Rectifier Module
DESCRIPTION
The SRM4010 Module is a complete
where high bandwidth is needed. Proprietary
solution for implementing very high
prediction circuitry eliminates cross conduction
efficiency Synchronous Rectification and for sudden large changes in pulse width. The
eliminates many of the problems with self- module is self-powered from the transformer
driven approaches. The module connects to secondary winding and operates over a wide
the transformer secondary of a Forward
range of peak transformer voltages and PWM
Converter to provide complete high current frequencies.
rectification at output voltages ranging from 5
volts down to 1.0 volt, in a thermally efficient A 5-Volt Linear Regulator is also available as
surface mount package.
a power supply for other secondary side
circuitry such as powering opto coupler
Rectification Efficiency as high as 95% is feedback. In very low voltage applications
achieved by avoiding cross conduction.
where the peak transformer voltage is not high
Dedicated Ics provide effective Gate drive of enough for powering the modules, secondary
the ultra low Rds(on) MOSFETs used in the power can be provided to the regulator from an
module. In conventional self-driven
additional transformer winding.
approaches, the MOSFET drive ends as soon
as the power transformer finishes resetting. The High Current Surface Mount Package
This causes increased losses as the duty cycle has Low Inductance, and robust terminals
decreases. The SRM4010 control circuitry for superior regulation and low noise
drives either the Forward or the Catch
susceptibility in high load current transients.
MOSFET over virtually the entire duty cycle. The Module has an isolated base and is
Only a small prediction time, typically 100 ns, designed for direct PCB mounting with the
is needed to avoid cross conduction.
terminals formed within the package. The
base-plate of the module allows heat to be
The SRM 4010 is designed to handle large dissipated by the PCB etch, or a mechanical
sudden changes in duty cycle. This makes sink attachment through the PCB for higher
the module suitable for current mode control power applications.
applications, with large load changes
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: [phone]
Figure 2
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