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LM3411M5-3.3 Datasheet

  • LM3411M5-3.3

  • Precision Secondary Regulator/Driver

  • 13頁(yè)

  • NSC

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LM3411 Precision Secondary Regulator/Driver
December 1999
LM3411
Precision Secondary Regulator/Driver
General Description
The LM3411 is a low power fixed-voltage (3.3V or 5.0V) pre-
cision shunt regulator designed specifically for driving an op-
toisolator to provide feedback isolation in a switching regula-
tor.
The LM3411 circuitry includes an internally compensated op
amp, a bandgap reference, NPN output transistor, and volt-
age setting resistors.
A trimmed precision bandgap reference with temperature
drift curvature correction, provides a guaranteed 1% preci-
sion over the operating temperature range (A grade version).
The amplifier鈥檚 inverting input is externally accessible for
loop frequency compensation when used as part of a larger
servo system. The output is an open-emitter NPN transistor
capable of driving up to 15 mA of load current.
Because of its small die size, the LM3411 has been made
available in the sub-miniature 5-lead SOT23-5 surface
mount package. This package is ideal for use in space criti-
cal applications.
Although its main application is to provide a precision output
voltage (no trimming required) and maintain very good regu-
lation in isolated DC/DC converters, it can also be used with
other types of voltage regulators or power semiconductors to
provide a precision output voltage without precision resistors
or trimming.
Features
n
Fixed voltages of 3.3V and 5.0V with initial tolerance of
鹵
1% for standard grade and
鹵
0.5% for A grade
n
Custom voltages available (3V鈥?7V)
n
Wide output current range, 20 碌A(chǔ)鈥?5 mA
n
Low temperature coefficient
n
Available in 5-lead SOT23-5 surface mount package
(tape and reel)
Applications
n
Secondary controller for isolated DC/DC PWM switching
regulators systems
n
Use with LDO regulator for high-precision fixed output
regulators
n
Precision monitoring applications
n
Use with many types of regulators to increase precision
and improve performance
Typical Application and Functional Diagram
DS011987-1
Basic Isolated DC/DC Converter
DS011987-2
LM3411 Functional Diagram
SIMPLE SWITCHER
鈩?/div>
is a tradmark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS011987
www.national.com

LM3411M5-3.3 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Voltage References

  • Series References

  • Precision

  • 3.3 V

  • 1 %

  • 20 V

  • 15 mA

  • + 85 C

  • SOT-23

  • Reel

  • - 40 C

  • SMD/SMT

  • 1000

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