DC975A

DC975A demonstration circuit is a DC/DC converter for APD bias featuring the LT3482 in a 3mm x 3mm QFN package. This demo circuit is designed to convert a 3V-12V source to 80V at 2mA. The circuit runs at 1.1MHz but can be easily programmed to run at 650KHz (inductor and other components might need to change for such case). The LT3482 features a 48V, 260mA switch, integrated Schottky diodes and a high side current monitor which provides a current proportional to the APD current. This current can be used as a reference to digitally program the output via the CTRL pin. This circuit is specifically designed for APD bias and is optimized for performance, solution size and profile. To further reduce the solution size, inductors such as Taiyo Yuden BRL2012B type can be used though efficiency will suffer about 10%. Typical applications include APD bias, PIN diode bias, optical receivers and modules, fibre optic network equipment etc.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party