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Flyback Synchronous Rectifier Driver Provides 10A Output Current
Most prior solutions use a signal transformer driven from the primary-side to control the synchronous rectifier; however the LT8309 senses the drain-to-source voltage of the MOSFET for activation. This technique not only eliminates a transformer, but allows the LT8309 to work with Linear Technology’s growing line of no-opto-coupler products required for output voltage feedback boundary conduction mode (BCM)/critical conduction mode (CrCM) flyback converters, making it highly versatile for many types of applications.
The LT8309 operates from a 4.5V to 40V input voltage range. Its 500µA quiescent current maximizes light load efficiency. The strong 1Ω pull-down gate driver provides fast device turn-off and its low minimum on- and off-times improve noise immunity. Additional features include a mere 22ns propagation delay, adjustable and accurate trip voltage along with the ability to drive 150V rated MOSFETs.
The LT8309 is available in a SOT-23 package. Pricing starts at $1.82 each in 1,000-piece quantities. For more information, visit www.linear.com/product/LT8309.
Summary of Features: LT8309
- Synchronous Rectification
- High Output Current - Up to 10A
- Higher Efficiency & Better Thermal Performance
- Works with BCM/CrCM Architectures
- Wide 4.5V to 40V Input Voltage Range
- Supports Up to 150V MOSFETs
- 22ns Turn-Off Propagation Delay
- Accurate Minimum On- & Off-Times for Reliable Operation
- Adjustable & Accurate Trip Point: -5mV to -30mV
- 1 Ohm Gate Driver Pull-Down
- SOT23 5-Lead Package
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