Part Number: LM27761EVM Other Parts Discussed in Thread: LM27761 , LM339A According to the data sheet, the formula for Vout is -1.22*(R1+R2)/R2
where Vfb should be (1.22) between 1.202V and 1.238V
So I choose R1=115K and R2=499K to get Vout=-1.5V…
Hi Stephen,
The setup in general looks ok but do you have connected the thermal pad to GND?
Otherwise I would recommend to use our EVM https://www.ti.com/tool/LM27761EVM for testing this device.
Best regards, Sepp
Hello Joselito,
I tried to start up the LM27761EVM slowly as described in the thread. Vin of 5V was ramped up within 1.25ms. The output voltage was generated without any problems.
Best regards,
Andreas.
Hello user,
Thanks for your question and sorry for the late answer.
The topic of current limiting resistor on EN pin is strictly dependent on the specific device implementation.
Referring to the EVM ( Using the LM27761EVM Evaluation Module ), you…
Hi,
Did you replace LDO output capacitor or charge pump output capacitor? If you have not replaced charge pump output capacitor, that is one thing you could try. You might have to also increase value of the flying capacitor. Another thing is DC bias…
