AC-DC Power Supplies
CHD250 Series
Signals & Controls
Characteristic
Notes & Conditions
Uncommitted isolated optocoupler transistor, normally off when AC is good (see fig.5)
Provides 5 ms warning of loss of output from AC failure off when AC is healthy.
Power Fail (AC-OK)
Inhibit
Uncommitted isolated optocoupler diode, powered diode inhibits the supply (see fig.6 & 7)
5V/0.5A Isolated supply present when AC applied.
Standby Supply (optional)
Remote Sense
Compensates for 0.25V per lead, 0.5V total drop.
Power Fail
Inhibit (High)
Inhibit (Low)
Figure 7
Figure 5
Figure 6
5 V
5 V
POWER SUPPLY
POWER SUPPLY
POWER SUPPLY
8V Max 3 mA
Pin 2 CON 4
5 mA 8 V Max
1K
Power Fail
Collector
Inhibit Hi
8 V Max
Pin 4 CON 4
Inhibit Hi
Pin 4
Transistor On: Input & Output Not OK
Transistor Off: Input & Output OK
CON 4
Power Fail
Emitter
Pin 1 CON 4
Inhibit Lo
Inhibit Lo
5 mA
Pin 3 CON 4
Pin 3 CON 4
VI RTN
VI RTN
Signal Connector
Pin 7 CON 4
Pin 7 CON 4
Signal Connector
Signal Connector
Environmental
Characteristic
Minimum
-20
Typical
Maximum
Units
°C
Notes & Conditions
See derating curve, fig.8. and Thermal
Considerations on page 8.
Operating Temperature
+70
+85
Storage Temperature
Cooling
-40
°C
Convection cooled
Non-condensing
Information Technology
Medical
Humidity
95
%RH
m
5000
4000
Operating Altitude
Shock
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
Vibration
Temperature Derating Curve
Figure 8
Standard & Covered (-C) versions
5 V Standby (-A & -AC) versions
300
Open Frame Convection
Covered Convection
250
217
200
Open Frame Convection
Covered Convection
220
165
125
126.5
110
108.5
82.5
0
0
-20
50
70
-20
50
70
Ambient Temperature (°C)
Ambient Temperature (°C)
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