BD85506F - Documentation

BD85506F is a 2-channel secondary side Synchronous Rectification (SR) controller for LLC with enhanced abnormality detection function on the secondary side. This IC has a function to detect FET abnormalities such as body diode rectification operation. In addition, it incorporates a high-accuracy overvoltage detection circuit, contributing to improved safety and reduction of external components. For efficiency, the OFF threshold voltage of the synchronous rectifier FET can be adjusted with a resistor. Moreover, by providing the Source monitor pin of each FET, it is possible to monitor the voltage between Drain and Source, and further improvement in efficiency is possible. In the burst operation at light load of the primary side controller, the synchronous rectification operation is automatically placed in the standby state, suppressing the switching power and the circuit current of the IC itself and reducing standby power consumption. The built-in multipurpose comparator can also be used as a low consumption shunt regulator in addition to the abnormality detection comparator. The operating power supply voltage ranges from 5.0 V to 32 V, covering various output voltage lineups. Additionally, by adopting a process with a high withstand voltage of 120 V(Max), it is possible to directly monitor the Drain voltage.

* This is a standard-grade product.
For Automotive usage, please contact Sales.

Application Note

Thermal Resistance
The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.
Part Explanation
For ICs