I have interfaced the uln2803a with an addressable latch. the load that the 2803 is driving is 1.2A so i have paralleled three of the arrays. my problem is that the device driving the 2803 can't support the current requirements and the voltage is dropping, causing the latch to shut down. is this due to the internal resistors' parallel network? if so would it be a good idea to have a 2n4400 to help out?