blackshadow
New Member
guys,
i'm a little bit lost with my very simple adjustable voltage regulator circuit using LM1084.
manual and simulation based analysis shows that the circuit MUST work with proper regulation at any loads.
but in actual circuit, this is not happening
AT NO LOAD:
Vin=11.57V (drop from 12V due to supply resistance)
Vout=6.5 (this is as expected per manual and simulations)
WITH LOAD (1.49A)
Vin=10.87V
Vout=4.77V
Per simulation using LT spice (included in the circuit attached), for any load, Vout should be regulated to 6.50V.
the minimum load current is around 5mA which is typical per datasheet.
What went wrong? I'm using a heatsink on top of a fan. I really can't think of any other issue here. I already used 3 LM1084's are are all the same.
i'm a little bit lost with my very simple adjustable voltage regulator circuit using LM1084.
manual and simulation based analysis shows that the circuit MUST work with proper regulation at any loads.
but in actual circuit, this is not happening
AT NO LOAD:
Vin=11.57V (drop from 12V due to supply resistance)
Vout=6.5 (this is as expected per manual and simulations)
WITH LOAD (1.49A)
Vin=10.87V
Vout=4.77V
Per simulation using LT spice (included in the circuit attached), for any load, Vout should be regulated to 6.50V.
the minimum load current is around 5mA which is typical per datasheet.
What went wrong? I'm using a heatsink on top of a fan. I really can't think of any other issue here. I already used 3 LM1084's are are all the same.