STMicroelectronics is introducing a new family of 150V POWER SCHOTTKY diodes, intended for 12V and more secondary rectification, in applications such as desktops, file servers or adaptors for notebook
The document introduces a new family of 150V Power Schottky diodes from STMicroelectronics designed for secondary rectification in Switch Mode Power Supplies (SMPS) with outputs between 12V and 24V. It compares these diodes against traditional 200V bipolar diodes to demonstrate improvements in design optimization, power density, efficiency, and reliability.
The note provides detailed technical analysis through two specific examples: a 24V/48W Flyback converter and a 12V/96W Forward converter. It calculates conduction losses, reverse losses, and thermal limits to quantify the efficiency gains achieved by replacing bipolar diodes with Schottky technology. Additionally, it examines switching behavior, including turn-on characteristics and turn-off spike voltages in continuous mode operation.
| Voltage Rating | 150V |
|---|---|
| Application Output Voltage | 12V and more secondary rectification |
| Target Applications | desktops, file servers or adaptors for notebook |
| Switching Frequency Limit | lower than 100kHz |
In a typical application, a 150V Schottky can be used up to 175°C due to low reverse current values.
A snubber circuit is necessary because the high spike voltage caused by leakage inductance and recovery charge can exceed the breakdown voltage without it.