Hi all,
Is there any way to define the TPS5405's switching frequency using Rosc resistor so it remains fixed? I have placed 100k resistor and I have around 270kHz switching frequency when I measure it across Schottky diode. Any frequency above 270kHz is OK for my end circuit.
The problem begins when a relay turns on in my circuit (more current gets consumed) - so the switching frequency of TPS5405 drops and tends to interfere with another oscillator in my circuit that operates at 40-150kHz.
How can I stop TPS5405 from dropping the switching frequency below 270kHz or even more?
EDIT: I am using 1N5817 diode and 82uH coil from Coilcraft (MSS1048-823ML).
Thanks in advance!