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Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range
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LT3825
Isolated No-Opto
Synchronous Flyback Controller
with Wide Input Supply Range
DESCRIPTION FEATURES The LT®3825 is an isolated switching regulator controller
designed for medium power flyback topologies. A typical
application is 10W to 60W with input voltage limited only
by external power path components. A third transformer
winding provides output voltage feedback. Senses Output Voltage Directly from Primary Side Winding—No Opto-Isolator Required
n Synchronous Driver for High Efficiency
n Input Voltage Limited Only by External Power Components
n Accurate Output Regulation without User Trims
n Switching Frequency from 50kHz to 250kHz
n Synchronizable
n Load Compensatio Programmable Undervoltage Lockout
n Available in a Thermally Enhanced 16-Lead TSSOP Package
n The LT3825 is a current mode controller that regulates
output voltage based on sensing secondary voltage via a
transformer winding during flyback. This allows for tight
output regulation without the use of an opto-isolator,
improving dynamic response and reliability. Synchronous
rectification increases converter efficiency and improves
output cross regulation in multiple output converters. …