North America (USA): 1-888-41-ASTEC Europe (UK): 44 (1384) 842-211Asia (HK): 852-2437-9662
1
Special Features
Electrical Specs
Special Features
25 Amps
• High Efficiency
• -40°C to +85°C Ambient Air Operation
• 1.30” x 0.9" x 0.35" TH or SMT package
• High capacitive load limit on start-up
• Industry standard feature sets: UVLO, OVP,
OCP, OTP, On/Off Enable, Remote Sense,
Output Trim
• Basic Insulation
• Regulation to zero load
• Fixed frequency switching
• EU Directive 2002/95/EC compliant for RoHS
Input
Input Range 36 to 75 VDC
Input Surge 100V /100ms
Efficiency 88%@1.8V (Typical)
Output
Line Regulation ±0.1%VO
Load Regulation ±0.1%VO
Noise/Ripple135mV Typ
Remote sense Up to 10% of Vo
Transient Response 3%Vo (typ) deviation
50% to 75% Load change
80µs settling time (typ)
Overvoltage Protection 125% VOtyp (autorecovery)
Over Current protection 115% IOtyp (autorecovery)
Over Temperature 115ºC average PCB temperature
Protection (autorecovery)
Switching Frequency Fixed Frequency
Isolation Voltage 1500 Vdc
Control
Voltage Adjust 90 to 110% Vo
Enable TTL compatible
(Positive or Negative enable options)
Ambient air operating temperature range:
-40°C to +85°C
Storage temperature: -40°C to +125°C
Overtemperature protection: 115°C PCB
temperature (Typical)
MTBF: > 1 million hours
UL,cUL 60950-1
TUV EN60950-1
Environmental
Total Power: 60W
Input Voltages: 48
No. of Outputs: Single
Safety
Astec Industry Standard
ALD25
PIN SIDE DOW N
0.35
[8.8]
1.30
[33.0]
0.04Ø [1.0Ø ](6X)
0.22
[5.5]
0.90
[22.9]
0.03
[0.8]
0.19
[4.8]
0.062 Ø
[1.57Ø ] (2
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 Efficiency2Model Number
Voltage Voltage Current
36V to 75V 5.0V 12A 91% Typ ALD12A48(N) - (6)(S)(L)
36V to 75V 3.3V 18A 90% Typ ALD18F48(N) - (6)(S)(L)
36V to 75V 2.5V 20A 89% Typ ALD20G48(N)- (6)(S)(L)
36V to 75V 1.8V 25A 88% Typ ALD25Y48(N) - (6)(S)(L)
36V to 75V 1.5V 25A 85% Typ ALD25M48(N)- (6)(S)(L)
36V to 75V 1.2V 25A 83% Typ ALD25K48(N) - (6)(S)(L)
NOTES:
Efficiency values taken at nominal input full load condition, 25oC ambient temperature.
OPTIONS
(N) : "N" = designates Negatve Logic Enable (default is Positive Enable with no suffix “N” required)
(6) : “-6” = 3.7mm nominal pin length (default is 5mm nominal pin length with no suffix “-6” required)
(S) : “-S” = Surface Mount Termination (default is thru hole termination with no sufix “-S required)
(L) : “L” = RoHS compliant (RoHS 6) / “Blank” - RoHS compliant with Lead (PB) in solder exemption (RoHS 5)
Pin Assignments
ALD25
Single Output
1. + Vin
2. Enable
3. - Vin
4. - Vout
5. - Sense
6. Trim
7. + Sense
8. +Vout
Notes:
1. Measured at 20MHz bandwidth with external 10 µF
tant. capacitor in parallel with 0.1 µF ceramic
capacitor placed across +Vout and -Vout; 33µF e-cap
or equivalent placed across +Vin and -Vin.
2. Efficiency measurements taken at full load, nominal
line and TA= 25 °C.
3. All specifications are typical at nominal line, full load
and TA= 25 °C unless otherwise noted.
4. Mechanical drawings are for reference only.
Dimensions are in inches [millimeters]. Mechanical
tolerance: ± 0.002[0.5], recommended surface mount
pads: ∅ = 0.11[2.79] ± 0.005 [0.13]; through hole pin
diameter (Pins 4 & 8) ∅ = 0.062 [1.57], others ∅ =
0.04 [1.0] (6X).
5. Technical reference Notes should be consulted for
detailed information when available.
6. All specifications subject to change without notice.
7. Warranty 1 yr.
Astec Industry Standard
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. (REV08: MARCH 05, 2006)
Pin 1 Pin 8
TH Termination
0.60
[15.2]
0.30
[7.6]
0.15
[3.8]
0.10
[2.5]
SIDE VIEW
PINSIDE UP
0.60
[15.2]
0.45
[11.4]
0.30
[7.6]
0.15
[3.8]
0.15
[3.8]
1.10
[27.9] 0.10
[2.5]
PIN SIDE UP
SMT Termination
0.90 [22.9]
PIN SIDE DOW N
1.30 [33.0]
See A
PIN LENGTH A
Std Pin Length: 0.189 [4.8] MIN
0.205 [5.2] MAX
“-6” Option: 0.137 [3.5] MIN
0.152 [3.9] MAX
0.06 [1.4]
0.30 [7.6]
0.30 [7.6]
0.10 [2.5]
0.15 [3.8]
0.60 [15.2]
0.45 [11.4]
0.15 [3.8]
0.30 [7.6]
0.15 [3.8]
1.10 [27.9]
PIN SIDE UP
