Flyback, Forward & Isolated Controllers
Analog Devices’ growing portfolio of primary and secondary side controllers provides a simple and cost-effective replacement of dc-to-dc converter bricks used in backplane power conversion. The primary side switching regulator controllers are configurable in flyback controllers, single- or dual-transistor forward converters, push-pull converters, or full-bridge converters up to 1.5 kW. Similarly, the secondary side controllers provide synchronous rectification, drive, or postregulation.
Product Selection Table
Latest Resources
Product Selector Card
LT Journal
- 560V Input, No-Opto Isolated Flyback Converter PDF
- Simple, Fast Pulse Source Outpaces Expensive Lab Equipment PDF
- Active Clamp Synchronous Controllers for Forward Converters with 6.5V to 100V+ Inputs PDF
- Increase Current Capability and Simplify Thermal Design of Flyback Converters with Secondary-Side Synchronous Rectifier Driver in a 5-Pin SOT-23 PDF
- 100V Micropower No-Opto Isolated Flyback Converter in 5-Lead TSOT-23 PDF
- Two Wide Input Range Monolithic Switching Regulators Make it Easy to Fit Boost, Flyback, SEPIC and Inverting Topologies into Tight Spaces PDF
- Two High Power Monolithic Switching Regulators Include Integrated 6A, 42V or 3.3A, 42V Power Switches PDF
- January 2009 - Primary-Side Sensing Takes Complexity out of Isolated Flyback Converter Design PDF
- June 2009 - Two New Controllers for Boost, Flyback, SEPIC and Inverting DC/DC Converters Accept Inputs up to 100V PDF
- Mar 2007 - Isolated Forward Controllers Offer Buck Simplicity and Performance PDF
- Mar 2007 - Current Mode Flyback DC/DC Controller Provides Tremendous Design Flexibility PDF
- Oct 2007 - Compact Controller is a Basic Building Block for Wide Array of DC/DC Conversion Solutions PDF
- Sep 2006 Simple, High Efficiency, Multi-Output, Isolated Flyback Supply with Excellent Regulation PDF
- Mar 2006 High Voltage Boost/LED Controller Provides 3000:1 PWM Dimming Ratio PDF
- Mar 2006 Tiny Controller Makes It Easy to Charge Large Capacitors PDF
- March 2005 - Efficient and Reliable Drive for Synchronous MOSFET Rectifiers PDF
- Feb 2004 Triple-Output Telecom Housekeeping Converter Small Enough for a Postage Stamp Board PDF
- Sep 2003 Synchronous, Phase Modulated, Full Bridge Converter Targets Isolated High Power Applications PDF
- Nov 2000 Phase-Shift Full-Bridge Controller Enables Efficient, Isolated Power Conversion for High Power Applications PDF
- Dec 2002 A Simple Solution to Low Noise, Isolated Power Conversion PDF
- May 2002 Simple Isolated Telecom Flyback Circuit Provides Regulation Without Optocoupler PDF
- Sep 2001 The LTC1871 Achieves the Industry's Highest Efficiency for Single-Ended Boost, Flyback and SEPIC Topologies PDF
- Isolated Power Supplies Made Easy
- How to Design an Isolated, High Frequency, Push-Pull DC/DC Converter
Application Notes
- AN118 - High Voltage, Low Noise, DC/DC Converters PDF
- AN126 - 2-Wire Virtual Remote Sensing for Voltage Regulators - Clairvoyance Marries Remote Sensing PDF
- AN125 - Using the LTM2881 as an Isolated 5V Power Supply PDF
- AN84 - Linear Technology Magazine Circuit Collection, Volume IV PDF
- AN73 - LT1339 Design Manual PDF
Technical Articles
- DC/DC Converter, Capacitor Charger Takes Inputs from 4.75V to 400V
- Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution
- LTC3723-1 130W Isolated Push-Pull Converter for PoE Applications with 93.5% Peak Efficiency
- LT8310/LT1431 92W Isolated Forward Converter with Opto Feedback; VIN = 48V, VOUT = 54V@1.7A
- LT8310/LT1431 81W Isolated Forward Converter with Opto Feedback; VIN = 12V/24V, VOUT = 54V @ 1.5A
- LT3798/LT8309 5V, 2A Energy Star Compliant Isolated Converter
- No-Opto Flyback DC/DC Converters & Snubber Protection Circuits
- No-Opto Isolated Flyback Converters
- Differences Between the Ćuk Converter and the Inverting Charge Pump Converter
- Monolithic Converter Delivers High Output Voltages
- LT3753 9V-15V Input to 54V/3A Isolated Forward Converter
- LT3752/LT8311 48Vin, 24Vout Active Clamp Forward Converter with High Light Load Efficiency
- 19V-29V input to 48V/2A Isolated Forward Converter using LT3753
- LT3752/LT8311 240W Isolated Forward Converter
- Miniature Isolated Solution Using LT8301 and Coupled Inductor
- LTspice: Simple Steps for Simulating Transformers
- Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V
- The Low Output Voltage Ripple Zeta DC/DC Converter Topology
Videos
- How To Design a Simple Isolated Flyback Converter - LT3573
- LTC3765/LTC3766 Video Product Brief
- Isolated Flyback Controller with PFC Controls Voltage or Current
- Simple and Efficient Sub-2W Isolated Power Supply
- LT3757 2.9V to 40V Boost, SEPIC, Flyback or Inverting Controller
- Design a Simple, Efficient and Reliable Forward Converter
- LT3798 Video Product Brief
- LT8302 Video Product Brief
- Active Clamp Synchronous Forward Controllers
- LT3999 Video Product Brief
- Simple, Compact and Efficient Isolated Power with Low IQ No Opto Flyback ICs
- LT8471 Video Product Brief
Design Notes
- DN559 - 560V Input, No-Opto Isolated Flyback Converter PDF
- DN545 - Monolithic Converter Delivers High Output Voltages PDF
- DN338 - Power over Ethernet Isolated Power Supply Delivers 11.5W at 90% Efficiency PDF
- DN405 - Versatile Current Source Safely and Quickly Charges Everything from Large Capacitors to Batteries PDF
- DN344 - Flyback Controller Improves Cross Regulation for Multiple Output Applications PDF
- DN377 - Isolated Converters Have Buck Simplicity and Performance PDF
- DN299 - Multiple Output Isolated Power Supply Achieves High Efficiency with Secondary Side Synchronous Post Regulator PDF
- DN371 - High Efficiency 2-Phase Boost Converter Minimizes Input and Output Current Ripple PDF
- DN347 - Simple Circuit Replaces and Improves on Power Modules at Less Than Half the Price PDF
- DN316 - Ultralow Noise Switching Power Supplies Simplify EMI Compliance PDF
- DN525 - Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution PDF
- DN509 - Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V PDF
- DN1022 - Negative Buck Converter with Short-Circuit Protection and Shutdown PDF
- DN481 - 2-Phase, Dual Output Synchronous Boost Converter Solves Thermal Problems in Harsh Environments PDF
- DN458 - Buck Converter Eases the Task of Designing Auxiliary Low Voltage Negative Rails PDF
- DN410 - Flyback Controller Simplifies Design of Low Input Voltage DC/DC Converters PDF
- DN406 - Versatile High Power LED Driver Controller Simplifies Design PDF
- DN1011 - Simple High Efficiency Isolated Flyback Supply Without Optoisolator PDF
- DN1000 - Secondary Side Dual Output Controller Tightly Regulates Two Isolated Outputs PDF
Flyback, Forward & Isolated Controllers
| SortOrder | Part# | Number of Outputs | Vin (min) (V) | Vin (max) (V) | Output Power (typ) (W) | Topology | Monolithic | Comments | Price (1000+) ($ US) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ADP1071-2 | 1 | 4.5 | 60 | - | Flyback | Yes | Flyback controller with integrated isolation and SR drive | $3.50 (ADP1071-2ARWZ) |
| 2 | ADP1071-1 | 1 | 450m | 6 | - | Flyback | Yes | Flyback controller with integrated isolation and SR drive | $3.50 (ADP1071-1ARWZ) |
| 3 | ADP1074 | 1 | 1 | 60 | - | Flyback, Forward | No | Isolated, Synchronous Forward Controller with Active Clamp and iCoupler | $3.96 (ADP1074ARWZ) |
| 4 | LTC1871X | 1 | 2.5 | 36 | 50 | Boost, Flyback, Inverting, Sepic | No | Wide Input Range, Boost, Flyback and SEPIC Controller, 175C Max Junction Temp | $125.00 (LTC1871XMS#PBF) |
| 5 | LT8315 | 1 | 18 | 560 | 15 | Flyback | Yes | 560VIN Micropower No-Opto Isolated Flyback Converter with 630V/300mA Switch | $4.10 (LT8315EFE#PBF) |
| 6 | LT8303 | 1 | 5.5 | 100 | 5 | Flyback | Yes | 100VIN Micropower No-Opto Isolated Flyback Converter with 150V/450mA Switch | $3.15 (LT8303ES5#TRPBF) |
| 7 | LT8304 | 1 | 3 | 100 | 24 | Flyback | Yes | 100VIN Micropower No-Opto Isolated Flyback Converter with 150V/2A Switch | $3.55 (LT8304ES8E#PBF) |
| 8 | LT8331 | 1 | 4.5 | 100 | 15 | Boost, Flyback, Inverting, Sepic | Yes | Low IQ Boost/SEPIC/Flyback/Inverting Converter with 0.5A, 140V Switch | $2.95 (LT8331EMSE#PBF) |
| 9 | LT8310 | 1 | 6 | 100 | 150 | Forward | No | 100VIN Forward Converter Controller | $2.99 (LT8310EFE#PBF) |
| 10 | LT3999 | 1 | 2.7 | 36 | 10 | Push-Pull | Yes | Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control | $2.75 (LT3999EDD#PBF) |
| 11 | LT8471 | 2 | 2.6 | 50 | 20 | Boost, Buck, Flyback, Inverting, Sepic, Zeta | Yes | Dual, Multitopology (Buck/Boost/SEPIC/Inverter/Flyback) | $3.75 (LT8471EFE#PBF) |
| 12 | LT8309 | 1 | 4.5 | 40 | 80 | Flyback Synchronous Rectifier | No | Secondary-Side Synchronous Rectifier Driver | $1.82 (LT8309ES5#TRPBF) |
| 13 | LT8301 | 1 | 2.7 | 42 | 6 | Flyback | Yes | 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/1.2A Switch | $2.76 (LT8301ES5#TRPBF) |
| 14 | LT3753 | 1 | 8.5 | 100 | 400 | Forward | No | Active Clamp Synchronous Forward Controller | $3.19 (LT3753EFE#PBF) |
| 15 | LT3752-1 | 1 | 10 | 400 | 400 | Forward | No | Active Clamp Synchronous Forward, Internal Housekeeping Controller, Vin 400V+ | $3.39 (LT3752EFE-1#PBF) |
| 16 | LT3752 | 1 | 6.5 | 100 | 400 | Forward | No | Active Clamp Synchronous Forward, Internal Housekeeping Controller, Up to 100Vin | $3.39 (LT3752EFE#PBF) |
| 17 | LT8302 | 1 | 2.8 | 42 | 18 | Flyback | Yes | 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch | $3.47 (LT8302ES8E#PBF) |
| 18 | LT8300 | 1 | 6 | 100 | 2.5 | Flyback | Yes | 100Vin Micropower No-Opto Isolated Flyback Converter with 150V/260mA Switch | $3.01 (LT8300ES5#TRPBF) |
| 19 | LT3957A | 1 | 3 | 40 | 30 | Boost, Flyback, Inverting, Sepic | Yes | Multi-topology Converter 5A, 40V Switch, Improved Load Transient Over LT3957 | $2.95 (LT3957AEUHE#PBF) |
| 20 | LT3798 | 1 | 10 | 38 | 80 | Flyback | No | Isolated No Opto-Coupler Flyback Controller with Active PFC | $2.25 (LT3798EMSE#PBF) |
| 21 | LTC3766 | 1 | 8 | 75 | 500 | Forward | No | High Efficiency, Secondary-Side Synchronous Forward Controller | $3.88 (LTC3766EGN#PBF) |
| 22 | LTC3765 | 1 | 8 | 75 | 500 | Forward | No | Active Clamp Forward Controller and Gate Driver | $2.56 (LTC3765EMSE#PBF) |
| 23 | LT3511 | 1 | 4.5 | 100 | 2.5 | Flyback | Yes | Monolithic High Voltage Isolated Flyback Converter | $2.95 (LT3511EMS#PBF) |
| 24 | LT3748 | 1 | 5 | 100 | 80 | Flyback | No | 100V Isolated Flyback Controller | $3.12 (LT3748EMS#PBF) |
| 25 | LT3575 | 1 | 3 | 40 | 14 | Flyback | Yes | Isolated Flyback Converter without an Opto-Coupler | $2.97 (LT3575EFE#PBF) |
| 26 | LT3958 | 1 | 5 | 80 | 50 | Boost, Flyback, Inverting, Sepic | Yes | High Input Voltage, Boost, Flyback, SEPIC and Inverting Converter | $3.05 (LT3958EUHE#PBF) |
| 27 | LT3581 | 1 | 2.3 | 22 | 20 | Boost, Flyback, Inverting, Sepic | Yes | 3.3A Boost/Inverting DC/DC Converter | $2.45 (LT3581EDE#PBF) |
| 28 | LT3579-1 | 1 | 2.5 | 16 | - | Boost, Inverting, Sepic | Yes | 6A Boost/Inverting DC/DC Converter with Fault Protection, Dual Phase Capable | $3.30 (LT3579EUFD-1#PBF) |
| 29 | LT3579 | 1 | 2.5 | 16 | 60 | Boost, Flyback, Inverting, Sepic | Yes | 6A Boost/Inverting DC/DC Converter with Fault Protection | $3.30 (LT3579EUFD#PBF) |
| 30 | LT3512 | 1 | 4.5 | 100 | 4.5 | Flyback | Yes | Monolithic High Voltage Isolated Flyback Converter | $3.15 (LT3512EMS#PBF) |
| 31 | LT3758A | 1 | 5.5 | 100 | 50 | Boost, Flyback, Inverting, Sepic | No | Multi-Topology Controller - Improved Load Transient Over LT3758 | $2.35 (LT3758AEDD#PBF) |
| 32 | LT3757A | 1 | 2.9 | 40 | 50 | Boost, Flyback, Inverting, Sepic | No | Multi-Topology Controller - Improved Load Transient Over LT3757 | - |
| 33 | LT3574 | 1 | 3 | 40 | 3 | Flyback | Yes | Isolated Flyback Converter Without an Opto-Coupler | $2.76 (LT3574EMS#PBF) |
| 34 | LT3751 | 1 | 5 | 24 | 60 | Capacitor Charger, Flyback | No | Capacitor Charger Controller with Regulation | $3.65 (LT3751EUFD#PBF) |
| 35 | LT3573 | 1 | 3 | 40 | 7 | Flyback | Yes | Isolated Flyback Converter Without an Opto-Coupler | $2.76 (LT3573EMSE#PBF) |
| 36 | LTC3805-5 | 1 | 4.5 | 75 | 50 | Boost, Flyback | No | Adjustable Frequency Current Mode Flyback, LTC3805-5 4.5V Turn On Voltage | $1.39 (LTC3805EDD-5#PBF) |
| 37 | LTC3873-5 | 1 | 4 | 75 | 50 | Boost, Flyback, Sepic | No | No RSENSE Boost, LTC3873-5 5V to 75V During Start-Up | $1.25 (LTC3873EDDB-5#TRPBF) |
| 38 | LTC3873 | 1 | 8.8 | 75 | 50 | Boost, Flyback, Sepic | No | No RSENSE Boost, LTC3873 9V to 75V During Start-Up | $1.25 (LTC3873EDDB#TRPBF) |
| 39 | LTC1871-1 | 1 | 2.5 | 36 | 50 | Boost, Flyback, Inverting, Sepic | No | No RSENSE Current Mode Boost, LTC1871-1 Lower Burst Mode Threshold | $2.65 (LTC1871EMS-1#PBF) |
| 40 | LTC3803-3 | 1 | 9.2 | 75 | 15 | Flyback | No | SOT-23 Flyback Controller, LTC3803-3 8.7V Turn On Voltage, 300kHz | $1.12 (LTC3803ES6-3#TRPBF) |
| 41 | LT3837 | 1 | 4.5 | 20 | 80 | Flyback | No | Isolated No-Opto Synchronous Flyback Controller | $3.10 (LT3837EFE#PBF) |
| 42 | LTC3805 | 1 | 8.8 | 75 | 50 | Boost, Flyback, Sepic | No | Adjustable Frequency Current Mode Flyback, LTC3805 8.4V Turn On Voltage | $1.39 (LTC3805EDD#PBF) |
| 43 | LTC3783 | 1 | 3 | 36 | 25 | Boost, Flyback, LED Driver, Sepic | No | PWM LED Driver and Boost, Flyback and SEPIC Converter | $2.85 (LTC3783EDHD#PBF) |
| 44 | LTC3725 | 1 | 9 | 75 | 300 | Forward | No | Single-Switch Forward Controller and Gate Driver | $2.56 (LTC3725EMSE#PBF) |
| 45 | LT3825 | 1 | 14 | 75 | 80 | Flyback | No | Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range | $3.10 (LT3825EFE#PBF) |
| 46 | LT3750 | 1 | 3 | 24 | 60 | Capacitor Charger, Flyback | No | Capacitor Charger Controller | $3.50 (LT3750EMS#PBF) |
| 47 | LTC3706 | 1 | 5 | 30 | 300 | Secondary Side Controller | No | Secondary-Side Synchronous Forward Controller with Polyphase Capability | $3.88 (LTC3706EGN#PBF) |
| 48 | LTC3705 | 1 | 18 | 80 | 300 | Forward | No | 2-Switch Forward Controller and Gate Driver | $2.63 (LTC3705EGN#PBF) |
| 49 | LTC3726 | 1 | 9 | 75 | 300 | Secondary Side Controller | No | Secondary-Side Synchronous Forward Controller | $3.19 (LTC3726EGN#PBF) |
| 50 | LTC3803-5 | 1 | 5.7 | 75 | 15 | Flyback | No | SOT-23 Flyback Controller, LTC3803-5 4.8V Turn On Voltage, 200kHz | $1.12 (LTC3803ES6-5#TRPBF) |
| 51 | LT1952-1 | 1 | 8.3 | 25 | 300 | Flyback, Forward | No | Single Switch Synchronous Forward Controller, LT1952-1: 400µA; VIN On/Off = 7.75V/6.5V | $3.30 (LT1952EGN-1#PBF) |
| 52 | LT1952 | 1 | 15.75 | 25 | 300 | Flyback, Forward | No | Single Switch Synchronous Forward Controller, LT1952: 460µA; VIN On/Off = 14.25V/8.75V | $3.30 (LT1952EGN#PBF) |
| 53 | LTC3721-1 | 1 | 10.7 | 75 | 750 | Push-Pull | No | Push-Pull PWM Controller | $4.45 (LTC3721EGN-1#PBF) |
| 54 | LTC3803 | 1 | 9.2 | 75 | 15 | Flyback | No | SOT-23 Flyback Controller, LTC3803 8.7V Turn On Voltage, 200kHz | $1.12 (LTC3803ES6#TRPBF) |
| 55 | LTC3723-2 | 1 | 10.7 | 75 | 300 | Push-Pull | No | Synchronous Push-Pull PWM Controllers, LTC3723-2 Voltage Mode | $4.55 (LTC3723EGN-2#PBF) |
| 56 | LTC3723-1 | 1 | 10.7 | 75 | 300 | Push-Pull | No | Synchronous Push-Pull PWM Controllers, LTC3723-1 Current Mode | $4.55 (LTC3723EGN-1#PBF) |
| 57 | LT1950 | 1 | 3 | 25 | 300 | Flyback, Forward | No | Boost, flyback and forward controller. transformer and MOSFET protection | $2.90 (LT1950EGN#PBF) |
| 58 | LTC3806 | 1 | 10 | 75 | 60 | Flyback | No | Synchronous Flyback DC/DC Controller | $3.40 (LTC3806EDE#PBF) |
| 59 | LTC3722-2 | 1 | 10.5 | 75 | 4k | Full Bridge | No | Synchronous Dual Mode Full Bridge Controllers, LTC3722-2 Current Mode | $5.50 (LTC3722EGN-2#PBF) |
| 60 | LTC3722-1 | 1 | 10.5 | 75 | 4k | Full Bridge | No | Synchronous Dual Mode Full Bridge Controllers, LTC3722-1 Current Mode | $5.50 (LTC3722EGN-1#PBF) |
| 61 | LTC1871-7 | 1 | 2.5 | 36 | 50 | Boost, Flyback, Inverting, Sepic | No | LTC1871-7 Drives 6V-gate N-Channel MOSFETs | $2.65 (LTC1871EMS-7#PBF) |
| 62 | LT3781 | 1 | 8 | 72 | 300 | Forward | No | Bootstrap start dual transistor synchronous forward controller | $4.95 (LT3781EG#PBF) |
| 63 | LT3439 | 1 | 2.8 | 20 | 10 | Push-Pull | Yes | Slew Rate Controlled Ultralow Noise1A Isolated DC/DC Transformer Driver | $3.50 (LT3439EFE#PBF) |
| 64 | LTC1871 | 1 | 2.5 | 36 | 50 | Boost, Flyback, Inverting, Sepic | No | No RSENSE Current Mode Boost, Flyback and SEPIC Controller | $2.65 (LTC1871EMS#PBF) |
| 65 | LT1681 | 1 | 9 | 72 | 300 | Forward | No | Dual transistor synchronous forward controller | $5.00 (LT1681ESW#PBF) |
| 66 | LTC1922-1 | 1 | 3.8 | 10.3 | 300 | Full Bridge | No | Synchronous phase modulated full-bridge controller. adaptive DirectSense zero voltage switching | $5.50 (LTC1922EG-1#PBF) |
| 67 | LT1737 | 1 | 5 | 22 | 25 | Flyback | No | High Power Isolated Flyback Controller | $2.90 (LT1737CS#PBF) |
| 68 | LT1725 | 1 | 16 | 75 | 50 | Flyback | No | General Purpose Isolated Flyback Controller | $2.90 (LT1725CS#PBF) |
| 69 | LT1680 | 1 | 4 | 60 | 300 | Boost | No | High input voltage, Synchronizable | $4.00 (LT1680CN#PBF) |
| 70 | LT1425 | 1 | 2.8 | 20 | 6 | Flyback | Yes | Isolated flyback, 5% accurate Vout | $2.90 (LT1425CS#PBF) |
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