50 USA: 1-888-41-ASTEC Europe (UK): 01384-842211 Asia (HK): 852-2437-9662
SPECIAL FEATURES
• Active power factor correction
• IEC EN6100-3-2 compliance
• Remote sense & remote inhibit
• Power fail
• Single wire current sharing
• Built-in EMI filter
• Low output ripple
• 2 Supervisory outputs 5 V and 12 V
• Overvoltage protection
• Overload protection
• Thermal overload protection
• DC power good
• Optional top with fan cover -CF
• Optional end fan cover -CEF
ENVIRONMENTAL
Operating temperature: 0° to 50°C ambient
derate each output at 2.5% per degree from
50° to 70°C
Electromagnetic susceptibility: Designed to
meet IEC 801, -2, -3, -4, -5, -6, Level 3
Humidity: Operating; non-condensing
5% to 95%
Vibration: Three orthogonal axes, sweep at
1 oct/min, 5 min. dwell at four major resonances
0.7 G peak 5 Hz to 500 Hz, operational
Storage temperature: -40° to 85°C
Temperature coefficient: ±.04% per °C
MTBF demonstrated: >550,000 hours at full
load and 25°C ambient conditions
ELECTRICAL SPECIFICATIONS
Input
Input range ........................... 85-264 V AC; 120-370 VDC
Frequency ............................ 47-440 Hz
Inrush current.......................20 A max., cold start @ 25°C
Efficiency.............................. 75% typical at full load
EMI filter ............................... FCC Class B conducted and radiated
CISPR 22 Class B conducted and radiated
EN55022 Class B conducted and radiated
VDE 0878 PT3 Class B conducted and
radiated
Power factor ......................... 0.99 typical
Safety ground
leakage current .................... <0.5 mA @ 50/60 Hz, 264 VAC input
Output
Maximum power................... With cover: 250 W with 30 CFM forced air .
(-C) (-CF) (CEF)
Adjustment range ................. ±5% minimum
Supervisory output ............... 5 V @ 100 mA regulated; 12V @ 500 mA
Hold-up time......................... 20 ms @ 250 W load, 115 VAC nominal line
Overload protection.............. Short circuit protection on all outputs. Case
overload protected @ 110-145% above
peak rating
Overvoltage protection ......... 5 V output: 5.7 to 6.7 VDC. Other outputs
10% to 25% above nominal output
Logic Control
Power failure ........................ TTL logic signal goes high 50-150 msec
after 5 V output. It goes low at least 4 msec
before loss of regulation
Remote on/off....................... Requires an external contact (N.O or N.C)
to inhibit outputs
DC OK.................................. TTL logic goes high 50-50 msec after the
output. It goes low when there is loss of
regulation.
Remote sense ...................... Compensates for 0.5 V lead drop min. Will
operate without remote sense connected.
Reverse connection protected.
SAFETY
VDE0805/EN60950 (IEC950) 11774-3336-1262
ULUL1950E132002
CSACSA 22.2-234 Level 5LR53982C
NEMKOEN 60950/EMKO-TUEP95103843
(74-sec) 203
BABTEN60950/BS7002PS/606027
CB Certificate and report 2241
CE Mark (LVD)
LPS 250
250 Watts
Total Power
200 - 250 Watts
Input Voltages
85 - 264 VAC
120 - 370 VDC
LPS 250 Series
# of Outputs
Single
Power Fax: 760-930-0881 51
Low Power
LOW
Power
ASTEC AMERICA
5810 Van Allen Way
Carlsbad, CA 92008
Telephone: 760-930-4600
Facsimile: 760-930-0698
ASTEC EUROPE
Astec House, Waterfront Business Park
Merry Hill, Dudley
West Midlands, DY5 1LX, UK
Telephone: 01384-842211
Facsimile: 01384-843355
ASTEC ASIA
6F., China Dyeing Works Building
382-392 Castle Peak Road
Tsuen Wan, N.T., Hong Kong
Telephone: 852-2437-9662
Facsimile: 852-2402-4426
Doc No: 1026 • REV 5.7.99
LPS250
DRAWINGS
Model Output Minimum Maximum Load with Peak Regulation2Ripple
Number Voltage Load 30 CFM Forced Air Load1P/P (PARD)3
LPS252-C 5 V (3-6 V) 1.50 A 50 A 60 A ±2% 50 mV
LPS253-C 12 V (6-12 V) 0.63 A 21 A 25 A ±2% 120 mV
LPS254-C 15 V (12-24 V) 0.50 A 16.7 A 20 A ±2% 150 mV
LPS255-C 24 V ( 24-48 V) 0.32 A 10.4 A 12.5 A ±2% 240 mV
1. Peak current lasting <30 seconds with a maximum 10% duty cycle.
2. At 25°C including initial tolerance, line voltage, load currents and output voltages adjusted to factory settings.
3. Peak-to-peak with 20 MHz bandwidth and 10 µF in parallel with a 0.1 µF capacitor at rated line voltage and load ranges.
4. If optional CF or CEF fans are not used, 30CFM forced air cooling needs to be provided and is required through the length of
the power supply . Not convection rated.
5. Output voltage adjustment requires a minimum load.
Note: -CF suffix added to the model number indicates cover with top fan. -CEF suf fix added to the model number indicates
cover with dual end mounted fan cover and AC inlet.
ORDERING INFORMATION
PIN ASSIGNMENTS
Connector
SK1 PIN 1 Neutral
PIN 2 Line
PIN 3 Ground
SK3 PIN 1 + Remote sense
PIN 2 - Remote sense
PIN 3 Remote inhibit (N.O)
PIN 4 Remote inhibit (N.C)
PIN 5 Common
PIN 6 Current sharing
PIN 7 Power Fail
PIN 8 DC Power Good
SK4 PIN 1 + Fan’s power source (12 V @ 500 mA)
PIN 2 - Fan’s power source (12 V @ 500 mA)
SK5 PIN 1
+ Supervisory output supply (5 V @ 100 mA)
PIN 2
- Supervisory output supply (5 V @ 100 mA)
SK7 PIN 1 + Fan’s power source (12 V @ 500 mA)
PIN 2 - Fan’s power source (12 V @ 500 mA)
Mating Connectors
SK3 Molex 22-01-1084
PINS:08-70-0057
SK4 Molex 22-01-3027
PINS: 08-50-0114
SK5 Molex 22-01-3027
PINS: 08-50-0114
SK7 Molex 22-01-3027
PINS: 08-50-0114
NOTES
1. Specifications subject to change without notice.
2. All dimensions in inches (mm), tolerance is ±.02”.
3. Specifications are at factory settings.
4. To enable normally closed remote inhibit, cut jumper J1.
5. Mounting maximum insertion depth is 0.15”.
6. Warranty: 1 year
7. Weight: 2.6 lb / 1.19 kg
5.0 (127.0) 2.0
(50.8)
1.18 (30.0)
9.0
(228.6)
6.64
(168.6)
3.42 (87.0)
.79
(20)
SK3
SK1
12345678
3 2 1
SK5
+ve -ve
Terminal
O/P ADJ.
SK4
FAN
#6-32 UNC (8 places)
5.46
(138.6)
8.52
(216.4)
M3 (4 places)
3.68
(93.6)
3.15
(80)
2.17
(55)
3.0
(76.2)
.39
(10) 1.46
(37.0)
Optional
(-CF)
Cover 
with Fan
Optional 
(-CEF) 
Cover 
with fans
10.26
(260.6)
SK7
AC Inlet
.24 (6.1)
6-32 (2 places)
Main Output
6-32 (3 places)