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L7987 parts selection

PZha.1
Associate III

HI Sir,

 

"Could you please check the following switching frequency waveform images?
 
The setup is: 24V input, 12V output (max load ~1.8A), R-FSW = 68kΩ, inductor = 15μH, and COMP configured as 680Ω + 33nF (parallel with 1nF) — see the images below.
 
This 12V output powers both a mini PC and a 200Hz PWM backlight circuit.
 
Which value should we use for R15: 680Ω, 10kΩ, or another resistance?"

PZha1_1-1766666083421.png

DB32-24in-12out1.43A-R15 680ohm.png

DB32-24in-12out1.02A-R15 680ohm.png

DB32-24in-12out1.43A-R15 10K .png

DB32-24in-12out1.02A-R15 10K.png

    

 

 

 

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