cranwell Publish time 2021-7-18 18:40:57

DSO5102 IC U12_5 Hot

Edited by cranwell at 2021-7-19 08:40

U12_6 on schematic,    U908 on board,   KA78R05 is running at 245 deg F(Almmost max allowable temp).   Scope does not pass self callibration.stops step 2/380Xc00.

The large IC will fry the adjacent capacitors.    5V measures 4.98 at TP901.   TP901 mjeasures 8 Ohms to Ground.   Input to the IC is 13.5 V

Lifting the output of U908 (Pin 2) the buss resistance to ground is still 8 ohms and the IC does not overheat.



How hot should IC get during operation ?   The spec sheet specifies Max 1.5W w/o heatsinc.   The device is dissipating 5W from my calculations.

Should the BUSS be passing 625 Ma ?(5/8)

Any ideas to troubleshoot ?








Pages: [1]
View full version: DSO5102 IC U12_5 Hot