Lambda Vega 450 - Page 10

Vega Customer Applications Manual Section 2 - Analogue Primary Options
Rev. A3: October 2003 Page 10 of 48
AC FAIL
Ic max 5mA
Vce max 30V
Warning time to DC output fall 5mS min (see timing diagrams below)
Vce saturated Less than 0.4V
The signal can be configured in two ways:
Either:
Or:
PIN 1
PIN 2
This provides an opto-isolated output which provides a minimum of
5mS warning before loss of output power due to either loss of AC
input or over temperature of the converter.
PIN 1 (AC FAIL SIGNAL)
PIN 2
RES
AC PRESENT
AC LOST
OUTPUT VOLTAGE
AC FAIL SIGNAL
>1s
>
5ms
5V AUX
5V
0V AUX
0V
AC LOST
OUTPUT VOLTAGE
AC FAIL SIGNAL
>
5ms
5V
PIN 1
PIN 2 (AC FAIL SIGNAL)
RES
AC PRESENT
5V AUX
0V AUX
0V