LT8310 - 100Vin Forward Converter Controller

LT8310 - 100VIN Forward Converter Controller

Features

Input Voltage Range: 6V to 100V
Duty Mode Control Regulates an Isolated = Output without an=20 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=20 FBX Pin
Programmable Soft-Start
Low Shutdown Current < 1=CE=BCA
Available in FE20 TSSOP with HV Pin Spacing

Typical Application

Description

The LT=C2=AE8310 is a simple-to-use resonant reset forward converter = controller=20 that drives the gate of a low side N-channel MOSFET from an internally = regulated=20 10V supply. The LT8310 features duty mode control that generates a = stable,=20 regulated, isolated output using a single power transformer. With the = addition=20 of output voltage feedback, via opto-coupler (isolated) or directly = wired=20 (nonisolated), current mode regulation is activated, improving output = accuracy=20 and load response. The flexibility to choose transformer turns ratio = makes high=20 step-down or step-up ratios possible without operating at duty cycle=20 extremes.

The user can program the switching frequency from 100kHz to 500kHz to = optimize efficiency, performance or external component size. A = synchronous=20 output is available for controlling secondary side synchronous = rectification to=20 improve efficiency. User programmable protection features include = monitors on=20 input voltage (UVLO and OVLO) and switch current (overcurrent limit). = The LT8310=20 soft-start feature helps protect the transformer from flux = saturation.

Packaging

For complete and up to date package information and = drawings,=20 please refer to our packaging page = =20

TSSOP-20

=20

Order Info

Part numbers ending in PBF are lead=20 free. Please contact LTC marketing for information on lead based = finish=20 parts.
Part numbers containing TR or TRM are shipped in tape=20 and reel or 500 unit mini tape and reel, respectively
Please refer to our general=20 ordering information or the product datasheet for more = details

=20

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*	RoHS Data
LT8310EFE#= PBF	TSSO= P	20	E	$3.94	$2.99	View
LT8310EFE#TRPBF	TSSO= P	20	E		$3.05	View
LT8310HFE#= PBF	TSSO= P	20	H	$4.79	$3.60	View
LT8310HFE#TRPBF	TSSO= P	20	H		$3.66	View
LT8310IFE#= PBF	TSSO= P	20	I	$4.37	$3.31	View
LT8310IFE#TRPBF	TSSO= P	20	I		$3.37	View
LT8310MPF= E#PBF	TSSO= P	20	MP	$13.11	$9.60	View
LT8310MPFE#TRPBF	TSSO= P	20	MP		$9.66	View
Buy=20 Now =E2=80=A2 Request=20 Samples

^* The USA list = pricing shown is=20 for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit = for the=20 stated volume), and is subject to change. International prices may = differ due to=20 local duties, taxes, fees and exchange rates. For volume-specific price = or=20 delivery quotes, please contact your local Linear Technology sales=20 office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of = charge to=20 qualified customers. Contact = your local=20 sales office or distributor to inquire about a demo board. Certain = demo=20 boards are also available for sale via credit card on this website. Demo = boards=20 are for evaluation purposes only. It remains the customer=E2=80=99s = responsibility to=20 verify proper and reliable operation in the actual end application. =

=20

Part Number	Description	Price	Documentation
DC1963A=20	LT8310EFE Demo Board \| Isolated Forward = Converter, 36V =E2=89=A4=20 VIN =E2=89=A4 72V; VOUT =3D 12V @ 6A	Contact=20 Factory	View
DC2015A	LT8310EFE/LT8311EFE Isolated Demo Board \| 36V = =E2=89=A4 VIN =E2=89=A4=20 72V; VOUT =3D 12V @ 12A	Contact=20 Factory	View
Buy=20 Now

Click=20 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

Product Notifications

Please login to your MyLinear account for notifications of datasheet = updates,=20 new document releases and LTspice model announcements for your favorite=20 products. If you do not have a MyLinear account you may Sign=20 Up Now.

Forgot your password? Click here.
= Need=20 help? Email mylinear@linear.com with = questions and=20 comments.

Design Tools

LTspiceIV

LTspice^=C2=AE = IV is a=20 powerful, fast and free simulation tool, schematic capture and waveform = viewer=20 with enhancements and models for improving the simulation of switching=20 regulators. Click here to = download=20 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=20 IV
Step 2: Once LTspice is installed, click on the = link(s)=20 below to launch the simulation
- LT8310/LT1431=20 Demo Circuit - 72 Watt Isolated Nonsynchronous Forward Converter = with Opto=20 Feedback (36-72V to 12V @ 6A)
- LT8310/LT1431=20 Demo Circuit - 81 Watt Isolated Nonsynchronous Forward Converter = with Opto=20 Feedback (10.8-26.4V to 54V @ 1.5A)
Step 3: If LTspice IV does not automatically open = after=20 clicking the link above, you can instead run the simulation by right = clicking=20 on the link and selecting "Save Target As." After saving the file to = your=20 computer, start LTspice and open the demonstration circuit by = selecting 'Open'=20 from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please = visit=20 our Demo Circuits=20 Collection.

Models for the following parts are available in LTspice=20 IV:
LT8310

Technical Support

For immediate technical assistance, contact=20 your local sales office or distributor or call 1-800-4-LINEAR (US=20 customers only) or 408-432-1900.
For less urgent requests, please complete our Technical=20 Support Request Form. Please allow 2-3 business days for=20 reply.

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