SRM4010 Microsemi Commercial Components Group, SRM4010 Datasheet

SRM4010

Manufacturer Part Number

SRM4010

Description

DIODE SYNC POWERMOD 40A SMD

Manufacturer

Microsemi Commercial Components Group

Datasheet

1.SRM4010.pdf (10 pages)

Specifications of SRM4010

Applications

Processor

Operating Temperature

-40°C ~ 80°C

Package / Case

SMD 1.83mm x 1.43mm

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Mounting Type

Current - Supply

Voltage - Supply

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Download datasheet (329Kb)

2004-02-06

The SRM

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 SRM

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

large sudden changes in duty cycle. This

makes the module suitable for current mode

control applications, with large load changes

48 to 150V

2000

REV. 1

4010 Module is a complete

4010 is designed to handle

Controller

PWM

4010 control circuitry

C O L O R A D O D I V I S I O N

P R OD UC T H I G H LI GH T

800 Hoyt Street, Broomfield, CO. 80020, 303-469-2161, Fax: 303-466-3775

D E S C R I P T I O N

Feedback

Figure 1

OPTO

REG

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

sink attachment through the PCB for higher

power applications.

FWD

SRM4010

SRM

PGND

4010

CTCH

Colorado Division

Microsemi

40A Synchronous Rectifier Module

1 to 5V

OUT

Easy to use Surface Mountable

Very High Rectification

Integrated Solution with few

Robust Package with Copper

5 Volt Linear Regulator

Suitable for converters that

Avoids problems with parallel

Operates at PWM Frequencies

ranging from 200 to 400KHz

High Current Isolated DC-DC

Distributed Power

CPU Power Supply off 48VDC

Bus

Solution for up to 40A

Efficiency at Output Voltages

from 5V down to 1V

external parts saves Board

Space

Base-Plate provides Effective

Heat Distribution

available to power Secondary

side Circuitry

operate at light load

operation that plague simple

self-driven schemes

Converters

Architectures

K E Y F E A T U R E S

APPLICATIONS

P A C KA GE

Figure 2

SRM

4010

Page 1

Related parts for SRM4010

SRM4010 Summary of contents

Page 1

... PCB etch mechanical sink attachment through the PCB for higher power applications OUT OUT FWD FWD CTCH CTCH TM SRM4010 SRM 4010 5V 5V REG REG PGND PGND OPTO OPTO Feedback Feedback Figure 1 Microsemi Colorado Division ...

Page 2

...

Page 3

Pin Pin Function and description Number Name This is the power MOSFET drain for the Catch device. It connects to the ...

Page 4

Page 5

General Description TM The SRM 4010 contains two power MOSFETs that act as low loss rectifiers. The proprietary control ICs operate these MOSFETs as ...

Page 6

Discontinuous/Light Load Operation TM The SRM 4010 is well behaved in light mode operation, which is also called discontinuous conduction mode. In this mode ...

Page 7

External Control Pins There are 3 external control pins for tailoring the module operation to the characteristics of the power converter. These external pins ...

Page 8

Typical Forward Converter Figure 7 shows a typical schematic for using the SRM linear regulator is used to provide power for the isolated optical ...

Page 9

Very Low Output Voltage Converter For voltages below 1.25 volts, R3 can be moved to REG out to allow regulation below the 1.24 volt ...

Page 10

Multi-Output Applications The module can be used in multiple output converters also any converter with multiple outputs from one power converter, there ...

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