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DATA SHEET
6.3
VSB UNDERVOLTAGE DETECTION
Both main and standby outputs are monitored. LED and PWOK_H pin signal if the output voltage exceeds ±5% of its nom i-
nal voltage. Output undervoltage protection is provided on the standby output only. When V SB falls below 75% of its nominal
voltage, the main output V 1 is inhibited.
6.4
CURRENT LIMITATION
MAIN OUTPUT
The main output exhibits a substantially rectangular output characteristic controlled by a software feedback loop. If it runs in
current limitation and its voltage drops below ~10.0 VDC for more than 200 ms, the output will latch off (standby remains on).
Figure 19 - Current Limitation on V 1 (V i = 230VAC)
12
10
8
6
4
2
0
0
20
40
60
80
100
Main Output Current [A]
A second current limitation circuit on V 1 will immediately switch off the main output if the output current increases beyond the
peak current trip point. The supply will re-start 4 ms later with a soft start, if the short circuit persists ( V 1 < 10.0V for >200 ms)
the output will latch off; otherwise it continuous to operate (hardware current limit triggers).
The latch can be unlocked by disconnecting the supply from the AC mains or by toggling the PSON_L input.
The main output current limitation will decrease if the ambient (inlet) temperature increases beyond 45°C or if the AC input
voltage is too low (see Figure 20 and Figure 21 ). Note that the actual current limitation on V 1 will begin at a current level ap-
proximately 4 A higher than what is shown in Figure 20 . (See also TEMPERATURE AND FAN CONTROL for additional in-
formation.)
STANDBY OUTPUT
The standby output exhibits a substantially rectangular output characteristic down to 0V (no hiccup mode / latch off). If it runs
in current limitation and its output voltage drops below the UV threshold, then the main output will be inhibited (standby re-
mains on). The current limitation of the standby output is independent of the AC input voltage, but is derated with the ambient
temperature (only for reverse airflow).
80
70
60
50
40
Figure 20 - Derating on V1 vs. Vi and Ta for
PFE850-12-054NA
80
70
60
50
40
Figure 21 - Derating on V 1 vs. V i and T a for
PFE850-12-054RA
30
20
Ta < 45°C
Ta < 55°C
30
20
Ta < 45°C
Ta < 55°C
10
0
Ta < 65°C
10
0
Ta < 65°C
90
115
140
165
190
215
240
265
90
115
140
165
190
215
240
265
Input AC Voltage [VAC]
Input AC Voltage [VAC]
PFE850-12-054xA
8
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