CMH250 Datasheet, PDF (4/8 Pages) XP Power Limited – 250 W Convection-cooled

CMH250 Series
AC-DC Power Supplies
Signals & Controls - Optional
Characteristic
Remote Sense
5 V Standby Supply (V2)
Optional 12 V Fan Supply (V3)
AC OK/Power Fail
Inhibit
Current Share
I²C
Model
CMH250PSXX
CMH250PSXX-01
CMH250PSXX-50
Power Fail
Figure 5
Remote Sense
P
P
P
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
J2 Logic Connector
Notes & Conditions
Compensates for 0.5 V total voltage drop. Also fitted to standard version.
5 V/2 A supply, always present when AC supplied
12 V/0.6 A supply, present when AC supplied, inhibit turns supply off. Also fitted to standard version.
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. 5.
The inhibit high pin should be pulled below 0.4 V to switch V1 & V Aux (V2) off. Open circuit or 2-8 V maximum to
switch the output on. See fig. 6.
Connecting pin 9 (-01 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. 7.
The I²C compatible interface can be added to the CMH250 and is used for monitoring the unit output voltage, current,
internal temperature and other data points. Adjustment of the output voltage and current limit set point and
identification of the unit model number and serial number are also possible. Contact sales for details.
Aux Supply V2
P
P
P
Signal Options
5 V Standby V3 AC OK/Power Fail
P
P
P
Inhibit V1 &
V Fan
P
Current Share
P
PMBus
P
Inhibit (High)
Figure 6
POWER SUPPLY
Inhibit Hi
Pin 10
Inhibit Lo
Pin 8 (-sense)
Parallel & Current Share
Figure 7
CMH250PSXX (1)
V1 Output
-
+
Current
Share
CMH250PSXX (2)
V1 Output
-
+
Current
Share
Pin 9
CMH250PSXX (3)
V1 Output
-
+
+ _Sense
- ^Sense
Signals Connector
-
+
Load
Environmental
Characteristic
Operating Temperature
Storage Temperature
Cooling
Humidity
Operating Altitude
Shock
Vibration
Minimum
Typical
Maximum
Units
Notes & Conditions
-40
+70
°C
See derating curve, fig.8. and Thermal Considerations on page 8.
-40
+85
°C
Convection-cooled
95
%RH
Non-condensing
5000
4000
m
Information Technology
Medical
±3 x 30g shocks in each plane, total 18 shocks. 30g = 11ms (±0.5msec), half sine. Conforms to EN60068-2-27 & EN60068-2-47
Single axis 10 - 500 Hz at 2g sweep and endurance at resonance in all 3 planes. Conforms to EN60068-2-6
Temperature Derating Curve
Figure 8
100
50
0
-40 -20 0
+50
+70
Ambient Temperature (ºC)
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