hello,
we have a new design with a lt1934.
We are using the preferred parts but I can hear a high frequency whistle.
Is this high frequency noise "normal"?
How can we avoid the noise?
What did I do wrong?
I have been oriented with the design of your DC544A evaluation kit.
We use the following parts:
Coil: SRU1038A - I test 100uH and 47uH nothing changed.
Output capacitor: Panasonic 8volt 100uF ESR 35m 8TPE100MAZB
Input capacitor: SMD size 1210 X7R 50V 2,2uF 10%
Input voltage: 24V
Output voltage: 3,3V
Consumers @3,3V: PIC18F27K40-I/ML, SN65C3232EP
Schematic see DC544A
Board layout: IC102 LT1934
Thanks a lot!
