I have had some failure recently using TC7662 charge pumps to create negative voltages for an automotive application.
ICL7662 had been what I was using before but has been backordered so I used the compatible TC7662 with some resulting failures.
Questions: What is the difference between ICL and TC in the name designation?
My failure appear to happen at start-up, so I think I may have a latch-up issue.
The TC7662 data sheet has a note:
rate of rise of the input voltage to less than 2V/μsec.
What is the reason for this, and would an automotive battery require a capacitor?
ICL7662 had been what I was using before but has been backordered so I used the compatible TC7662 with some resulting failures.
Questions: What is the difference between ICL and TC in the name designation?
My failure appear to happen at start-up, so I think I may have a latch-up issue.
The TC7662 data sheet has a note:
If the voltage supply driving the TC7662B has a large
source impedance (25-30 ohms), then a 2.2
source impedance (25-30 ohms), then a 2.2
μF capacitor
from pin 8 to ground may be required to limit the
from pin 8 to ground may be required to limit the
rate of rise of the input voltage to less than 2V/μsec.
What is the reason for this, and would an automotive battery require a capacitor?