North America (USA): 1-888-41-ASTEC Europe (UK): 44 (1384) 842-211Asia (HK): 852-2437-9662
1
Special Features
Electrical Specs
Special Features
50 Amps
•Industry standard Quarter Brick package
1.48" x 2.30" x 0.38"
•Openfrmae low profile construction
•High capacitive load start-up
•Regulation to zero load
•Fixed frequency switching for EMI predictability
•Industry Standard Features: Input UVLO with
hysteresis, Enable, OCP, OCP, OTP, Output
Voltage Trim, Differential Remote Sense
•Meets Basic Insulation
Input
Input Range 36 to 75 VDC
Input Surge 100V /100ms
Efficiency 3.3V @ 91% (typical)
Output
Line / Load < 0.3% Vo (typical)
Regulation
Output Current up to 50A max
(3.3V at 40A max)
Noise/Ripple140mVPK-PK (typical)
Remote sense Up to 10% of Vo
Transient Response 100mV (typ) deviation
50% to 75% Load change
250µs (typ) recovery
Overvoltage Protection 130% typ for Vo < 3.3V
125% typ for 3.3V
Over Current Protection 120% Iout typ (autorecovery)
Over Temperature 115C average PCB temperature
Protection (autorecovery)
Switching Frequency 480kHz
540kHz (2.5V output)
Isolation Voltage 1500Vdc
Control
Voltage Voltage Trim ±10% VO,NOM
Enable Postive or Negative Logic options
Operating Ambient Temperature: -40°C to +85°C
Storage Temperature: -40°C to +125°C
MTBF: > 1 million hours
UL, cUL 60950
TUV EN60950
Environmental
Total Power: 132W
Input Voltages: 48V
No. of Outputs: Single
Safety
ALQ50
High Efficiency Quarter 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 Efficiency2Model Number
Voltage Voltage Current
36V to 75V 3.3V 40A 91% Typ ALQ40F48(N)
36V to 75V 2.5V 50A 90% Typ ALQ50G48(N)
36V to 75V 1.8V 50A 89% Typ ALQ50Y48(N)
36V to 75V 1.2V 50A 86% Typ ALQ50K48(N)
OPTIONS:
(N) :"N" = designates Negative Logic Enable (default is Positive Enable with no suffix “N” required)
2.30
[58.4]
1.48
[37.6] [1.0Ø] 6 PLACES
[1.5Ø] 2 PLACES
0.04Ø
0.36
[9.1]
PIN SIDE DOWN SIDE VIEW
0.06Ø
0.24 MAX
[6.0]
[5.0]
0.20 MIN
1
2
3 4
5
6
7
8
Pin Assignments
Single Output
1. +Vin
2. Enable (On/Off)
3. -Vin
4. -Vout
5. -Sense
6. Trim
7. +Sense
8. +Vout
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 TA= 25°C.
3. All specifications are typical at nominal line, full load
and TA= 25°C unless otherwise noted.
4. All specifications subject to change without notice.
5. Mechanical drawings are for reference only.
Dimensions are in inches [millimeters]. Pin
placement tolerance ± 0.005 [0.127]. Mechanical
Tolerance ± 0.02 [0.5]. ∅ = 0.060” for Pins 4&8, the
rest are ∅ = 0.40”.
6. Technical Reference Notes should be consulted for
detailed information when available.
7. Warranty 1yr.
Astec reserves the right to make changes to the information
contained herein without notice and assumes no liability as a
result of its use and application. (REV 07: OCTOBER 19, 2004)
PIN SIDE DOWN
1.04
[26.4]
0.44
[11.2]
0.15
[3.8]
L
C
0.74
[18.8] 1.04
[26.5]
0.89
[22.7]
0.74
[18.9]
0.59
[15.0]
2.00
[50.8]
0.44
[11.2]
PIN SIDE UP
