UC2843A: How many V levels are there for the COMP pin to function normally as an error amplifier output.

Gabriel Wang1

Part Number: UC2843A

Tool/software:

Dear Expert

At present, the material is being analyzed in an open-loop state, and the PIN1 COMP pin feedback voltage output is 5.7V. Normal materials need to reach 6.8V. May I ask how many V levels are there for the COMP pin to function normally as an error amplifier output.

over 1 year ago

0 Hong Huang over 1 year ago

TI__Guru 74115 points

Hi,

Please provide your test circuit. There are no different levels based on the datasheet. We need to review your circuit and your test setup to decide what to do next.

0 Gabriel Wang1 over 1 year ago in reply to Hong Huang

Genius 4725 points

Dear Hong

Attached the sch ,pls give some suggestion:

0 Hong Huang over 1 year ago in reply to Gabriel Wang1

TI__Guru 74115 points

Hi,

Please describe how you make test to get COMP voltage. What voltage is applied to which part of the circuit and where your measurements are made, etc.

Also please provide the device top markings picture.

0 Gabriel Wang1 over 1 year ago in reply to Hong Huang

Genius 4725 points

Dear Hong

After powering on the machine, directly test the voltage difference between the following two pins with a multimeter.

0 Hong Huang over 1 year ago in reply to Gabriel Wang1

TI__Guru 74115 points

Hi,

What is FB pin voltage and VDD pin voltage, when COMP pin = 6.8V and 5.7V? Please measure these 3 voltages at the same time.

0 Hong Huang over 1 year ago in reply to Hong Huang

TI__Guru 74115 points

Hi,

As no communication for a long time, I will close this thread assuming no further support is needed.

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UC2843A: How many V levels are there for the COMP pin to function normally as an error amplifier output.