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Power ManagementSwitching
RegulatorFlyback,
Forward and Isolated Controllers
Space
& Harsh EnvironmentExtended
Temperature Plastic (H & MP)Extended
Temperature (H & MP) Switching Regulators

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Info

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Support

LTC4366-1/LTC4366-2 - High Voltage
Surge Stopper

LT8310 - 100VIN Forward Converter Controller

Features

Input Voltage Range: 6V to 100V

Duty Mode Control Regulates an Isolated Output without an
Opto

High Efficiency Synchronous Control

Short-Circuit (Hiccup Mode) Overcurrent Protection

Programmable OVLO and UVLO with Hysteresis

Programmable Frequency (100kHz to 500kHz)

Synchronizable to an External Clock

Positive or Negative Polarity Output Voltage Feedback with a Single
FBX Pin

Programmable Soft-Start

Low Shutdown Current < 1μA

Available in FE20 TSSOP with HV Pin Spacing

Typical Application

Description

The LT®8310 is a simple-to-use resonant reset forward converter controller
that drives the gate of a low side N-channel MOSFET from an internally regulated
10V supply. The LT8310 features duty mode control that generates a stable,
regulated, isolated output using a single power transformer. With the addition
of output voltage feedback, via opto-coupler (isolated) or directly wired
(nonisolated), current mode regulation is activated, improving output accuracy
and load response. The flexibility to choose transformer turns ratio makes high
step-down or step-up ratios possible without operating at duty cycle
extremes.

The user can program the switching frequency from 100kHz to 500kHz to
optimize efficiency, performance or external component size. A synchronous
output is available for controlling secondary side synchronous rectification to
improve efficiency. User programmable protection features include monitors on
input voltage (UVLO and OVLO) and switch current (overcurrent limit). The LT8310
soft-start feature helps protect the transformer from flux saturation.

Packaging
For complete and up to date package information and drawings,
please refer to our packaging page

TSSOP-20

Order Info

Part numbers ending in PBF are lead
free. Please contact LTC marketing for information on lead based finish
parts.

Part numbers containing TR or TRM are shipped in tape
and reel or 500 unit mini tape and reel, respectively

Please refer to our general
ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number

Package

Pins

Temp

Price (1-99)

Price (1k)*

RoHS Data

LT8310EFE#PBF

TSSOP

20

E

$3.94

$2.99

View

LT8310EFE#TRPBF

TSSOP

20

E

$3.05

View

LT8310HFE#PBF

TSSOP

20

H

$4.79

$3.60

View

LT8310HFE#TRPBF

TSSOP

20

H

$3.66

View

LT8310IFE#PBF

TSSOP

20

I

$4.37

$3.31

View

LT8310IFE#TRPBF

TSSOP

20

I

$3.37

View

LT8310MPFE#PBF

TSSOP

20

MP

$13.11

$9.60

View

LT8310MPFE#TRPBF

TSSOP

20

MP

$9.66

View

Buy
Now • Request
Samples

* The USA list pricing shown is
for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the
stated volume), and is subject to change. International prices may differ due to
local duties, taxes, fees and exchange rates. For volume-specific price or
delivery quotes, please contact your local Linear Technology sales
office or authorized distributor.

Demo Boards
Linear Technology offers many demo boards free of charge to
qualified customers. Contact your local
sales office or distributor to inquire about a demo board. Certain demo
boards are also available for sale via credit card on this website. Demo boards
are for evaluation purposes only. It remains the customer’s responsibility to
verify proper and reliable operation in the actual end application.

Part Number

Description

Price

Documentation

DC1963A

LT8310EFE Demo Board | Isolated Forward Converter, 36V ≤
VIN ≤ 72V; VOUT = 12V @ 6A

Contact
Factory

View

DC2015A

LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤
72V; VOUT = 12V @ 12A

Contact
Factory

View

Buy
Now

Click
here to view our complete list of demo boards

Applications

Industrial, Automotive and Military Systems

48V Telecommunication Isolated Power Supplies

Isolated and Nonisolated DC/DC Converters

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Controller

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates,
new document releases and LTspice model announcements for your favorite
products. If you do not have a MyLinear account you may Sign
Up Now.

Email Address

Password

Forgot your password? Click here.
Need
help? Email [email-masked] with questions and
comments.

Design Tools

LTspiceIV

LTspice® IV is a
powerful, fast and free simulation tool, schematic capture and waveform viewer
with enhancements and models for improving the simulation of switching
regulators. Click here to download
LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

Step 1: If you have not installed LTspice on this
computer, download and install LTspice
IV

Step 2: Once LTspice is installed, click on the link(s)
below to launch the simulation

LT8310/LT1431
Demo Circuit - 72 Watt Isolated Nonsynchronous Forward Converter with Opto
Feedback (36-72V to 12V @ 6A)

LT8310/LT1431
Demo Circuit - 81 Watt Isolated Nonsynchronous Forward Converter with Opto
Feedback (10.8-26.4V to 54V @ 1.5A)

Step 3: If LTspice IV does not automatically open after
clicking the link above, you can instead run the simulation by right clicking
on the link and selecting "Save Target As." After saving the file to your
computer, start LTspice and open the demonstration circuit by selecting 'Open'
from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit
our Demo Circuits
Collection.

Models for the following parts are available in LTspice
IV:
LT8310

Technical Support

For immediate technical assistance, contact
your local sales office or distributor or call 1-800-4-LINEAR (US
customers only) or 408-432-1900.

For less urgent requests, please complete our Technical
Support Request Form. Please allow 2-3 business days for
reply.

Order Now

Order
Now

Request
Samples

Documentation

Datasheet

LT8310
- 100VIN Forward Converter Controller

Press Release

100V
Synchronous Forward Controller Regulates Output Voltage without an
Opto-Coupler

LTspice

LT8310/LT1431
Demo Circuit - 72 Watt Isolated Nonsynchronous Forward Converter with Opto
Feedback (36-72V to 12V @ 6A)

LT8310/LT1431
Demo Circuit - 81 Watt Isolated Nonsynchronous Forward Converter with Opto
Feedback (10.8-26.4V to 54V @ 1.5A)

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