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LM3411N-3.3 |LM3411N33NSN/a40avaiPrecision Secondary Regulator/Driver


LM3411N-3.3 ,Precision Secondary Regulator/DriverapplicationsAlthough its main application is to provide a precision outputn Use with many types of ..
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LM3411N-3.3
Precision Secondary Regulator/Driver
LM3411
Precision Secondary Regulator/Driver
General Description

The LM3411isalow power fixed-voltage (3.3Vor 5.0V) pre-
cision shunt regulator designed specificallyfor drivingan op-
toisolatorto provide feedback isolationina switching regula-
tor.
The LM3411 circuitry includesan internally compensatedop
amp,a bandgap reference, NPN output transistor, and volt-
age setting resistors. trimmed precision bandgap reference with temperature
drift curvature correction, providesa guaranteed 1% preci-
sion overthe operating temperature range(A grade version).
The amplifier’s inverting inputis externally accessiblefor
loop frequency compensation when usedas partofa larger
servo system. The outputisan open-emitter NPN transistor
capableof drivingupto15 mAof load current.
Becauseofits small die size, the LM3411 has been made
availablein the sub-miniature 5-lead SOT23-5 surface
mount package. This packageis idealfor usein space criti-
cal applications.
Althoughits main applicationisto providea precision output
voltage(no trimming required) and maintain very good regu-
lationin isolated DC/DC converters,it can alsobe used with
other typesof voltage regulatorsor power semiconductorsto
providea precision output voltage without precision resistors trimming.
Features
Fixed voltagesof 3.3V and 5.0V with initial toleranceof
±1%for standard grade and ±0.5%forA grade Custom voltages available (3V–17V) Wide output current range,20 μA–15 mA Low temperature coefficient Availablein 5-lead SOT23-5 surface mount package
(tape and reel)
Applications
Secondary controllerfor isolated DC/DC PWM switching
regulators systems Use with LDO regulatorfor high-precision fixed output
regulators Precision monitoring applications Use with many typesof regulatorsto increase precision
and improve performance
Typical Application and Functional Diagram

DS011987-1
Basic Isolated DC/DC Converter

DS011987-2
LM3411 Functional Diagram

July 2000
LM341
Precision
Secondary
Regulator/Driver
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