North America (USA): 1-888-41-ASTEC
Europe (UK): 44 (1384) 842-211
Asia (HK): 852-2437-9662
1
Special Features
Electrical Specs
Special Features
25 Amps
High efficiency (88% Typical)
-40C to +85C Ambient Air Operation
Industry standard package
0.8" x 2.3" x 0.34"
High capacitive load limit on start-up
ON/OFF Enable
Remote sense compensation
Basic insulation
Regulation to zero load
Fixed frequency switching
Input
Input Range
18 to 36 VDC
Input Surge
50V /100ms
Efficiency
88%@3.3V Typ
Output
Line Regulation
0.1%
Load Regulation
10mV Typ
Output Voltage
1%
Setpoint
Noise/Ripple
40mV Typ
Remote sense
Up to 10% of Vo
Transient Response
5%Vo (typ) deviation
50% to 75% Load change
100s (typ) recovery time
Overvoltage Protection
125% typ
Current Limit
110% nominal output
Switching Frequency
660kHz typ
Control
Voltage Adjust
90 to 110% Vo
Enable
TTL compatible
(positive & negative enable options)
Ambient air operating temperature range:
-40C to +85C
Storage temperature: -40C to +125C
Overtemperature protection: 115C PCB
temperature (Typical)
MTBF: > 1 million hours
UL,cUL 60950
TUV
EN60950
Environmental
Total Power:
82W
Input Voltages:
24V
No. of Outputs:
Single
Safety
Astec Industry Standard
ALO25
High Efficiency 1/8 Brick
EUROPE
Astec House, Waterfront Business Park
Merry Hill, Dudley
West Midlands, DY5 1LX, UK
Telephone: 44 (1384) 842-211
Facsimile: 44 (1384) 843-355
AMERICAS
5810 Van Allen Way
Carlsbad, CA 92008
Telephone: 760-930-4600
Facsimile: 760-930-0698
2
Ordering Information
www.astecpower.com
ASIA
Units 2111-2116, Level 21
Tower1, Metroplaza
223, Hing Fong Road
Fwai Fong, New Territories
Hong Kong
Telephone: 852-2437-9662
Facsimile: 852-2402-4426
Input
Output
Output
Efficiency
Model Number
Voltage
Voltage
Current
18V to 36V
3.3V
25A
88% Typ
ALO25F24(N) - (6)(S)
NOTES:
Efficiency values taken at nominal input full load condition, 25
o
C ambient temperature.
OPTIONS
"N" = Negative logic enable (without "N" = positive enable)
"S" = SMT (default is TH)
"6" = 3.7mm pin length option (default pin length is 5mm nominal)
2.30 [58.4]
2.00 [50.8]
0.15 [3.8]
E
- Vin
0.70 [17.8]
0.40 [10.2]
0.10 [2.5]
+ Vin
+ Sense
0.80 [20.3]
0.70 [17.7]
0.04 [1.0](6X)
0.32 [8.1]
PIN SIDE DOWN
PIN SIDE UP
-Output
-Sense
Trim
0.06 [1.6](2X)
0.55 [14.0]
0.40 [10.1]
0.25 [6.3]
0.10 [2.5]
+ Output
0.20 [5.0] NOM.
SIDE VIEW
ALO25F24
Single Output
1. + Vin
2. Enable
3. - Vin
4. - Vout
5. - Sense
6. Trim
7. + Sense
8. Output Rtn
Notes:
1. 20 MHz bandwidth. External 10 uF tant. capacitor
in parallel with 1 uF ceramic capacitor placed
across the output and secondary return ground.
2. Efficiency measurements are typical values taken
at full load, nominal line and T
A
= 25C.
3. All specifications are typical at nominal line, full
load and T
A
= 25C unless otherwise noted.
4. All specifications subject to change without notice.
5. Mechanical drawings are for reference only.
Dimensions are in inches [mm]. Pin placement
tolerance 0.005 [0.127]. Mechanical Tolerance
0.02 [0.5], recommended surface mount pads (min:
0.080 x 0.112 [2.03 x 2.84] / max: 0092 x 0.124
[2.34 x 3.15]); through hole pin diameter (Pins 4 &
8)
=
0.062 [1.57], others
=
0.04 [1.0] (6X).
6. Safety approval for 3.3V version is available.
7. Technical Reference Notes should be consulted for
detailed information when available.
8. Warranty 1yr.
Astec Industry Standard
0.80 [20.3]
2.30 [58.4]
Through Hole
Surface Mount
Astec reserves the right to make changes to the information
contained herein without notice and assumes no liability as a
result of its use or application. (REV02: MARCH 7, 2005)
0.07 [1.7]
0.22 [5.5]
0.35 [8.9]
0.01 [0.4]
PIN SIDE DOWN
PIN SIDE DOWN
PIN SIDE UP
SIDE VIEW
0.70 [17.8]
0.40 [10.2]
0.10 [2.5]
0.06 [1.4]
2.19 [55.7]
0.70 [17.8]
0.55 [14.0]
0.40 [10.2]
0.25 [6.3]
0.10 [2.5]
PIN SIDE UP
SIDE VIEW
Pin Assignments
PDF 
ZIP