LT3798 - Isolated No Opto-Coupler Flyback Controller with Active PFC
Features
- Isolated PFC Flyback with Minimum Number of External Components
- VIN and VOUT Limited Only by External Components
- Active Power Factor Correction
- Low Harmonic Distortion
- No Opto-Coupler Required
- Constant-Current and Constant-Voltage Regulation
- Accurate Regulated Voltage and Current (±5% Typical)
- Energy Star Compliant (<0.5W No Load Operation)
- Thermally Enhanced 16-lead MSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT®3798 is a constant-voltage/constant-current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, allowing compliance with most Harmonic Current Emission requirements.
The LT3798 is well suited for a wide variety of off-line applications. The input range can be scaled up or down, depending mainly on the choice of external components. Efficiencies higher than 86% can be achieved with output power levels up to 100W. In addition, the LT3798 can easily be designed into high DC input applications.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT3798EMSE#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3798EMSE#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LT3798HMSE#PBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3798HMSE#TRPBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LT3798IMSE#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3798IMSE#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LT3798MPMSE#PBF | MS-16E | MSE | MP | 05-08-1667 | Yes |
| LT3798MPMSE#TRPBF | MS-16E | MSE | MP | 05-08-1667 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- 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 | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3798EMSE#PBF | MS-16E | E | $3.22 | $2.25 | Yes | |
| LT3798EMSE#TRPBF | MS-16E | E | $2.31 | Yes | ||
| LT3798HMSE#PBF | MS-16E | H | $4.11 | $2.88 | Yes | |
| LT3798HMSE#TRPBF | MS-16E | H | $2.94 | Yes | ||
| LT3798IMSE#PBF | MS-16E | I | $3.70 | $2.59 | Yes | |
| LT3798IMSE#TRPBF | MS-16E | I | $2.65 | Yes | ||
| LT3798MPMSE#PBF | MS-16E | MP | $9.99 | $6.99 | Yes | |
| LT3798MPMSE#TRPBF | MS-16E | MP | $7.05 | Yes | ||
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC1817B | LT3798EMSE Isolated Demo Board VIN = 90VAC to 265VAC, VOUT = 24V @ 2A High Voltage | $200.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3798HMSE#PBF | MS-16E | H | $4.11 | $2.88 | Yes | |
| LT3798HMSE#TRPBF | MS-16E | H | $2.94 | Yes | ||
| LT3798IMSE#PBF | MS-16E | I | $3.70 | $2.59 | Yes | |
| LT3798IMSE#TRPBF | MS-16E | I | $2.65 | Yes | ||
| LT3798MPMSE#PBF | MS-16E | MP | $9.99 | $6.99 | Yes | |
| LT3798MPMSE#TRPBF | MS-16E | MP | $7.05 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Offline 5W to 100W+ Applications
- High DC VIN Isolated Applications
- Offline Bus Converter (12V, 24V or 48V Outputs)
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Design Tools
LTspice
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LT3798
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.
