LT3798 - Isolated No Opto-Coupler Flyback Controller with Active PFC

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.

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

Typical Application

Applications

Offline 5W to 100W+ Applications
High DC VIN Isolated Applications
Offline Bus Converter (12V, 24V or 48V Outputs)

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LT3798EMSE#PBF	MS-16E	E	$3.22	$2.25
LT3798EMSE#TRPBF	MS-16E	E		$2.31
LT3798HMSE#PBF	MS-16E	H	$4.11	$2.88
LT3798HMSE#TRPBF	MS-16E	H		$2.94
LT3798IMSE#PBF	MS-16E	I	$3.70	$2.59
LT3798IMSE#TRPBF	MS-16E	I		$2.65
LT3798MPMSE#PBF	MS-16E	MP	$9.99	$6.99
LT3798MPMSE#TRPBF	MS-16E	MP		$7.05