Synchronous rectifier controllers IR1161L and IR11688S. Free Technical Library News

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IR1161L and IR11688S synchronous rectifier controllers

16.12.2016

Infineon has introduced to the market a new line of synchronous rectifier controllers for the secondary side of switching power converters, meeting the latest energy efficiency requirements. By using the IR1161L and IR11688S in conjunction with the latest generation of MOSFET switches OptiMOS and StrongIRFET, significant efficiency gains can be achieved over the Schottky diode circuit.

The controllers belong to the SmartRectifier family. During operation, the drain-source voltage is constantly measured, which allows you to determine the direction and amplitude of the current through the transistor. Thus, switching is achieved at its values close to zero. By constantly monitoring the Vds voltage, no current is allowed to flow through the parasitic diode of the transistor, which contributes to a significant reduction in power losses. It is also worth noting the MOT (minimum on time) function, which ensures that there are no reverse (negative) currents through the MOSFET. Reliability and noise immunity are achieved through the use of double-pulse suppression circuits, which allows you to work without problems in fixed and variable frequency modes.

The IR1161L drives one n-channel MOSFET and can operate in discontinuous current mode (DCM), edge conduction mode in flyback circuit (CrCM flyback), and resonant half-bridge circuits. The microcircuit finds application in chargers and AC-DC adapters.

The IR11688 can drive two n-channel MOSFETs and is used in resonant half-bridge converter circuits. The microcircuit provides protection against simultaneous switching on of both transistors, as well as an energy-saving mode that reduces its own consumption current to hundreds of microamperes when operating at a small load. The controller is used in compact power supplies of medium and high power.

Features of IR1161L and IR11688:

- transistor drain voltage control up to 200 V;
- maximum switching frequency 500 kHz for IR1161L and 400 kHz for IR11688;
- adjustable time MOT (minimum on time);
- protection against latch at low supply and control voltages;
- low current consumption;
- turn-on time delay 50 ns;
- supply voltage range from 4,75 V to 18 V.

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