trungkstn
Newbie level 5
Hi, I have some problem with ACPL-C87 ().
I intend use ACPL-C87 for measuring voltage with scheme like this
AC (220V/50Hz) --> Bridge rectity --> resistive divider (R1 = 1.5 MOhm + R2 = 10 kOhm) --> ACPL-C87.
Based on datasheet of ACPL-C87, I use resitor 10 kOhm. Voltage on R2 about 2V peak to peak, 1/2 cycle 50Hz. But when i supply 5V for IC ACPL-C87, voltage on R2 i measured reach to 4V peak to peak 1/2 cycle 50Hz.
I don't know why voltage on R2 changed?
Can you plain and show me a solution to solve this problem?
Thank you.
I intend use ACPL-C87 for measuring voltage with scheme like this
AC (220V/50Hz) --> Bridge rectity --> resistive divider (R1 = 1.5 MOhm + R2 = 10 kOhm) --> ACPL-C87.
Based on datasheet of ACPL-C87, I use resitor 10 kOhm. Voltage on R2 about 2V peak to peak, 1/2 cycle 50Hz. But when i supply 5V for IC ACPL-C87, voltage on R2 i measured reach to 4V peak to peak 1/2 cycle 50Hz.
I don't know why voltage on R2 changed?
Can you plain and show me a solution to solve this problem?
Thank you.