LT3002

RECOMMENDED FOR NEW DESIGNS

36V 10W No-Opto Isolated Flyback Converter

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $3.30

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Overview

4V to 36V Input Voltage Range
3.6A, 65V Internal DMOS Power Switch
Low Quiescent Current
Quasi-Resonant Boundary Mode Operation at Heavy Load
Low Ripple Burst Mode^® Operation at Light Load
Minimum Load < 0.5% (Typ) of Full Output

No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation
Accurate EN/UVLO Threshold and Hysteresis
Temperature Compensation for Output Diode
Output Short-Circuit Protection
Thermally Enhanced 8-Lead SO Package

The LT3002 is a monolithic micropower isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature compensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 3.6A, 65V DMOS power switch is integrated along with all the high voltage circuitry and control logic into a thermally enhanced 8-lead SO package.

The LT3002 operates from an input voltage range of 4V to 36V and delivers up to 10W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.

Applications

Isolated Automotive, Industrial, Medical Power Supplies
Isolated Auxiliary/Housekeeping Power Supplies

Part Models: 4
1ku List Price: Starting From $3.30

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3002ES8E#PBF	8-Lead SOIC (Narrow 0.15 Inch w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3002ES8E#TRPBF	8-Lead SOIC (Narrow 0.15 Inch w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3002IS8E#PBF	8-Lead SOIC (Narrow 0.15 Inch w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3002IS8E#TRPBF	8-Lead SOIC (Narrow 0.15 Inch w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 1

LT3002 Demo Circuit - µPower No-Opto Isolated Flyback Converter (10-30V to 12V @ 1A)

Models for the following parts are available in LTspice:

LT3002

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LT3002 Demo Board | Micropower No-Opto Isolated Flyback Converter with 65V/3.5A Switch

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Product Details

Demonstration circuit 3077A is a compact no-opto isolated flyback converter featuring the LT3002. The DC3077A outputs 12V and maintains tight regulation with a load current from 5mA up to 1.1A over an input voltage from 10V to 30V. The output current capability increases with the input voltage, as shown in the Performance Summary table.

Transformer leakage inductance causes a voltage spike on the primary side after the power switch turns off. The leakage inductance spike is limited within the MOSFET’s voltage rating of 65V with an RC snubber and a TVS clamp which damp the ringing and clamp the MOSFET drain voltage to a safe level.

The Performance Summary table summarizes the performance of the demo board at room temperature. The DC3077A demo circuit can be easily modified for different applications with some pre-designed transformers.

The LT3002 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 3077A.