CPFE1000FI SERIES
POWER SUPPLY
OPERATION MANUAL
7
19 August 2020
7. Over Voltage Protection (OVP)
The CPFE1000FIxx is equipped with OVP feature. The unit will shut down if the voltage on the output is between 125%
and 145% of nominal output voltage.
The output voltage will recover within 20 seconds after the OVP condition is removed.
If OVP occurs while the OTW signal is HIGH, the unit will not try to recover until after the OTW signal goes LOW.
8. Over Temperature Protection (OTP)
The CPFE1000FIxx is equipped with an OTP feature. Upon detection of an over temperature condition (OTP trip point =
95°C, typical), the OTP circuit will shut down the output. The output voltage will recover after the baseplate has been
allowed to cool and the OTW signal goes LOW.
The output voltage will recover within 20 seconds after the OTW signal goes LOW.
9. Remote Sensing (+S, -S terminals)
This unit has remote sensing terminals to compensate for voltage line drop from the output terminals to the output load.
When remote sensing is not required, leave the sense terminals disconnected.
Note that line drop (voltage drop due to wiring) compensation voltage range must be such that the output voltage is
within the output voltage adjustment range and that the voltage between -V and -S must be within 0.5V.
Consider power loss due to line drop and use this unit within the maximum allowable output power. Reduce the effect
of noise induced into the remote sensing lines by using shielded lines, a twist pair, or a parallel pattern, etc.
When remote sensing lines are long, add the electrolytic capacitor as shown in Fig 9-1. (if needed)
Fig. 9-1 Remote Sensing is used
