Hi,
I am using the LM2587 to obtain a +12V,-12V and 5V supply.
The circuit is the same as Fig. 29 of the datasheet.
However, I am facing the following problem :
As I slowly increase Vin, initially nothing happens. However, after Vin reaches 5V, the input current
suddenly increases (about 2-2.5A) and hits the current limit of the input supply.
Any ideas what may be the problem?
I have double-checked the circuit so I am pretty sure there are no errors in the PCB as such or with
components.
Initially, I am operating without connecting any external load-resistor. Do I need to operate with a load
resistor connected always?