Secondary-Side Synchronous Rectifier Driver
LT8309 Secondary-Side Synchronous Rectifier Driver
Features
n Works with DCM and BCM/CrCM Conduction Mode Flyback Topo...
Description
LT8309 Secondary-Side Synchronous Rectifier Driver
Features
n Works with DCM and BCM/CrCM Conduction Mode Flyback Topologies
n VCC: 4.5V to 40V n Supports Up to 150V MOSFETs n 26ns Turn-Off Propagation Delay n Accurate Minimum On and Off Timers for Reliable
Operation n Adjustable and Accurate Trip Point: +5mV to –30mV n 1Ω Gate Driver Pull-Down n SOT-23 5-Lead Package
Applications
n High Output Current Flybacks n High Efficiency Flybacks
Description
The LT®8309 is a secondary-side synchronous rectifier driver that replaces the output rectifier diode in a flyback topology. By replacing the diode with a N-channel MOSFET, applications are no longer restricted by the heat constraints of the output diode. The IC replicates the behavior of a diode by sensing the drain-to-source voltage to determine when the current becomes negative. The LT8309's low minimum on- and off-times help improve noise immunity. The fast propagation delay of 26ns allows applications to operate in discontinuous conduction mode (DCM) and critical conduction mode (CrCM). The gate driver features a 0.8Ω pull-down device for fast turn-offs. The 40V VCC rating allows the part to be driven from the output voltage or the rectified drain voltage of the MOSFET. A low quiescent current of 400µA maximizes efficiency at low output currents.
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