ISO1212: VCC1 is given 3.3V but output given is 1.2V

Sorry I mean voltage at Sense pin is 7,4V

Hi Choirul,

Thank you for reaching out to us.
Could you please share us the schematic that also includes the component values? I will first try to look at the schematic to see if there is any issue with schematic, thanks.

Regards,
Koteshwar Rao

I have check using OSC, the signal in Sense pin is only give half wave. I have been following any instruction in this forum, please need your help.

I want to detecting 120VAC. 

Choirul,

Would you be able to provide waveforms of Vsense and Vout? Also, C14, C15, C16, and C17 with values of 330nF may be too high. Could you try removing these capacitors to see if this helps?

Respectfully,

Lucas

Lucas,

G: Vsense
Y: Vout

Condition:

1. C14,C15,C16, C17 removed.

2. Input: around 114VAC

Is it proper to placing Rth before the bridge diode?

It's like the ISO1212 need more current in VSense that Rth limit the current. 

Choirul,

Yes it is proper to place Rthr before the rectifier as per figure 30 in the datasheet. It seems now that the device is functioning according to the waveform posted. Does there still seem to be a problem?

Respectfully,

Lucas

Hi Choirul,

Glad to hear that you were able to resolve the issue. Could you please tell us what was the cause of the issue and how did you resolve it? This will help us resolve the issue quickly if somebody else incurs the same problem. Thanks.

Regards,
Koteshwar Rao