EMH250PS12 Datasheet, PDF (8/9 Pages) XP Power Limited – 250/350 Watts EMH Series

Signals & Controls Dual Outputs
EMH350
Signals Description & Compatibility
Model
EMH350PDxx-U
EMH350PDxx-EF
Remote
Sense
Fan Supply 5 V Standby
Functions
AC OK/
Inhibit V1 &
Power Fail
V Fan
Current Share
Variable Speed
Fan Control
PMBus
Contact
Sales
Characteristic
Signals & Control
Remote Sense
12 V Fan Supply (V3)
5V Standby
AC OK/Power Fail
Inhibit
Current Share
Variable Speed Fan Control
Notes & Conditions
Compensates for 0.5 V total voltage drop
12 V/0.6 A supply, present when AC supplied, inhibit turns fan supply off.
5 V/2 A supply, always present when AC supplied
AC OK is an open collector transistor, referenced to negative sense, providing a minimum of 3 ms warning of loss of output
regulation. The transistor is normally off when AC is healthy. See fig. 4.
The inhibit high pin should be pulled below 0.4 V to switch V1 & V Fan (V3) off. Open circuit or 2-8 V maximum to switch
the output on. See fig. 5.
Connecting pin 9 (-01 & -02 models) of like voltage units (3 maximum) will force the current to share between the outputs.
Units share current within 10% of each other at full load. See fig. 6.
Only available for -EF models. Varies the speed of the integral fans depending input voltage, output power & ambient tem-
perature within the unit.
AC OK/Power Fail
Figure 4.
Inhibit
Figure 5.
POWER SUPPLY
Max 30 V 10 mA
5 V Standby
Pin 3 or 4
1K
AC OK Collector
Pin 11
AC OK Emitter
Pin 8 (-sense)
Transistor On (<0.8 V):
AC OK
Transistor Off (>4.5 V):
AC NOT OK
Inhibit Hi
Pin 10
Inhibit Lo
Pin 8 (-sense)
POWER SUPPLY
J2 Logic Connector
Signals Connector
Parallel Load & Current Share
Figure 6.
EMH350PDXX (1)
V1 Output
-
+
Current
Share
EMH350DSXX (2)
V1 Output
-
+
Current
Share
EMH350PDXX (3)
V1 Output
-
+
+ _Sense
- ^Sense
-
+
Load
-
+
V2 Output
EMH350PDXX (1)
-
+
V2 Output
EMH350DSXX (2)
-
+
V2 Output
EMH350PDXX (3)