1.We are trying to design a power supply circuit for telecom application with an input voltage of -48V to -60V and requires output power of +12V/2A.
2.Can you suggest if we can use LT8709 part in our design and also share us if any evaluation board details available with you.
There is LTspice simulation of a 5V design that you can start with. Please use this along with datasheet to modify to your liking.
LT8709 Demo Circuit - Negative Inverting Regulator with Output Current Monitor & Power Good (-4.5V to -42Vin to 5V @ 4A)