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Datasheet Linear Technology LT3439EFE#PBF

ManufacturerLinear Technology
SeriesLT3439
Part NumberLT3439EFE#PBF

Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver

Datasheets

  • Download » Datasheet PDF, 196 Kb, File uploaded: Sep 18, 2017
    LT3439: Slew Rate Controlled Ultralow Noise 1A Isolated DC/DC Transformer Driver Data Sheet
    Docket ↓
    LT3439
    Slew Rate Controlled
    Ultralow Noise1A Isolated
    DC/DC Transformer Driver U FEATURES
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    в–  DESCRIPTIO The LTВ®3439 is a push-pull DC/DC transformer driver that
    reduces conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by
    controlling the output switch voltage and current slew
    rates. Slew rates are user adjustable to optimize output
    noise versus efficiency. The LT3439 can reduce high
    frequency harmonic content by as much as 40dB with only
    a minor decrease in efficiency. Reduced Conducted and Radiated EMI
    Single Resistor Control of Output Switch Voltage
    and Current Slew Rates
    Cross Conduction Prevention Circuitry
    Two 1A Current Limited Power Switches ...

Prices

ProviderNamePrice
AliExpressMAX513AEEE EL4430CS LT3439EFE LT3439 OPA551UA OPA5518,90 $
More about terms of delivery »

Packaging

PackageTSSOP-16
Package CodeFE
Package Index05-08-1663 (BA)

Parametrics

Demo BoardsDC511A
Design ToolsLTspice File
Export Controlno
FeaturesLow EMI, Adjustable Slew Rate, Resistor Set Frequency, External Synchronization
Frequency250 kHz
Frequency Adjust Range20kHz - 250kHz
Frequency Sync Range20kHz - 300kHz
Integrated Inductorno
Ishutdown5 µA
Isupply12 mA
Monolithicyes
Number of Outputs1
Operating Temperature Range0 to 85 °C
Polyphaseno
Switch Current1 A
Synchronousno
TopologyPush-Pull
Vin Max20 V
Vin Min2.8 V
Vout Min2.8 V

Eco Plan

RoHSCompliant

Application Notes

  • Download » Application Notes - AN118 PDF, 2.6 Mb, File published: Mar 28, 2008
    High Voltage, Low Noise, DC/DC Converters
    Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high voltage, low current bias. Additionally, the high voltage must be pristinely free of noise; well under a millivolt is a common requirement with a few hundred microvolts sometimes necessary. Normally, switching regulator configurations cannot achieve this performance level without employing special techniques. One aid to achieving low noise is that load currents rarely exceed 5mA. This freedom permits output filtering methods that are usually impractical.
    Docket ↓
    Application Note 118
    March 2008
    High Voltage, Low Noise, DC/DC Converters
    A Kilovolt with 100 Microvolts of Noise
    Jim Williams This publication describes a variety of circuits featuring
    outputs from 200V to 1000V with output noise below 100ВµV
    measured in a 100MHz bandwidth. Special techniques
    enable this performance, most notably power stages
    optimized to minimize high frequency harmonic content.
    Although sophisticated, all examples presented utilize
    standard, commercially available magnetics—no custom
    components are required. This provision is intended to
    assist the user in quickly arriving at a produceable design.
    Circuits and their descriptions are presented beginning
    with the next ink.
    BEFORE PROCEEDING ANY FURTHER, THE READER
    IS WARNED THAT CAUTION MUST BE USED IN THE
    CONSTRUCTION, TESTING AND USE OF THE TEXT’S
    CIRCUITS. HIGH VOLTAGE, LETHAL POTENTIALS ARE
    PRESENT IN THESE CIRCUITS. EXTREME CAUTION
    MUST BE USED IN WORKING WITH, AND MAKING
    CONNECTIONS TO, THESE CIRCUITS. REPEAT: THESE
    CIRCUITS CONTAIN DANGEROUS, HIGH VOLTAGE ...

Design Notes

  • Download » Design Notes - DN316 PDF, 94 Kb, File published: Jul 2, 2003
    Ultralow Noise Switching Power Supplies Simplify EMI Compliance
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    advertisement Ultralow Noise Switching Power Supplies Simplify
    EMI Compliance – Design Note 316
    David Canny
    Introduction
    Most electronic products must pass electromagnetic
    interference (EMI) compliance tests—such as the FCC
    Part 15 rules in the US—before they can be released
    into the market. When a company’s product fails EMI
    compliance tests, the company loses control of the
    development process, shipping dates begin to slip,
    projected revenues diminish and expenses start piling
    up. Furthermore, excessive noise can interfere with
    sensitive electronics within the product itself. So it is
    essential that electronic products are designed from
    the beginning with EMI attenuation in mind. Often the
    EMI compliance problem lies in the product’s switching power supply. In these cases, the best solution is
    prevention by using an ultralow noise switching power
    supply in the initial design, rather than adding shields
    and п¬Ѓlters to the product after the fact. Circuit Description
    Figure 1 shows the LTВ®3439, one of several low noise
    switchers available from Linear Technology. Ultralow
    noise and low EMI are achieved by controlling both
    the output switch voltage and current slew rates. This ...

Articles

  • Download » Articles - LT Journal PDF, 181 Kb, File published: Nov 1, 2002
    A Simple Solution to Low Noise, Isolated Power Conversion
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    DESIGN IDEAS A Simple Solution to Low Noise,
    Isolated Power Conversion by Tom Sheehan
    Introduction
    the turns ratio. Rectifiers on the secondary side generate the DC output
    voltage. The output capacitor is for
    hold up and filtering. If required, an
    additional inductor and capacitor can
    be added to reduce the output noise
    even further.
    Control of the voltage and current
    slew rate is maintained via two control loops. One loop controls the
    output switch dV/dt and the other
    loop controls the output switch dI/dt.
    Output slew control is achieved by
    comparing the two currents generated by these slewing events to a
    current set by the external resistor
    RSL.
    The frequency of the internal oscillator can be set from 20kHz to 250kHz
    with an external resistor and capacitor, RT and CT. Each output switch is
    driven at half the frequency of the
    oscillator. The SYNC pin can be used
    to synchronize the switching to an
    external clock. A SHDN pin can be ...

Moldel Line

Series: LT3439 (2)

Manufacturer's Classification

  • Power Management > Switching Regulator > Ultralow Noise Regulators | Flyback, Forward and Isolated Controllers

Other Names:

LT3439EFEPBF, LT3439EFE PBF

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