Special Features
Electrical Specs
15 Watts
AK42A Dual
Surface mount
High power density 15W/Cu. in.
Full power capability without
external heat sink
Input differential and
common mode filtering
Hot insertable with inrush current limit
Ability to limit inrush current in
an external input capacitor
Input undervoltage lockout with hysteresis
Output overvoltage protection
Remote shutdown
Loadsharing on dual outputs
Operating ambient temperature range:
-40 to +75 C (no derating)
Cooling method: Convection
MTBF: 7.5 MHrs
Storage temperature: -55 to +125 C
UL
1950
IEC
950
CSA
C22.2-9.50
CB
52719-106
Input
Input Range:
36 to 75 VDC for 48V
18 to 36 VDC for 24V
Maximum Inrush
Current Limit:
1.0 A Max.
Maximum External
Capacitor to Limit
Inrush Current to 1.0 A:
4.0mF
Low Input Shutdown:
34.0 +/- 2.0 V for 48V
17.0V +/- 1.0V for 24 V
Auto Recovery:
37.0V +/- 2.0 V for 48V
18.5V +/- 1.0 V for 24V
Hysteresis:
3 V +/- 1 V for 48V
1.5V +/- 0.5V for 24V
Efficiency:
85%
Enable:
Open Circuit or up to 0.5V max.
Disable:
4V min., 75V max.
Output
Voltage Tolerance:
3% for single output
5% for dual output
Noise/Ripple:
75mV rms max.
Output Voltage
Adjust Range:
10% for single output
dual output non adjustable
Output Voltage
Protection
Self-limiting Clamp, 140% max.
Short Circuit
Protection
Continuous Auto Start
Switching Frequency:
200kHz nominal
Environmental
Total Power:
15 Watts
Input Voltages:
48V, 24 VDC
No. of Outputs:
Dual
Safety
A
s
t
e
c
C
o
n
v
e
n
tional
Pow
e
r
America's (USA): 1-888-41-ASTEC
Europe (UK): 44 (1384) 842-211
Asia (HK): 852-2437-9662
68
W9959_02_DCDC_001-073_73 2/8/02 3:56 PM Page 68
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
Ordering Information
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 Voltage
Output 1
Output 2
Maximum
Model Number
Voltage
Voltage
Power
Dual Output- 15 Watts Total Output Power
18-36
3.3V
2.5V
13.2W/10W
AK42A-024L-033D025SM
18-36
5V
3.3V
15W/13.2W
AK42A-024L-050D033SM
36-75
3.3V
2.5V
13.2W/10W
AK42A-048L-033D025SM
36-75
5V
3.3V
15W/13.2W
AK42A-048L-050D033SM
Dual Output
1. NC
2. V out 1
3. V out 1
4. V out 1
5. V out 1
6. V out 2
7. V out 2
8. V out 2
9. V out 2
10. GND
11. GND
12. GND
13. GND
14. GND
15. Reserved
16. +V in
17. +V in
18. CAP
19. CAP Inrush - consult TRN
20. CAP Inrush - consult TRN
21. CAP Inrush - consult TRN
22. CAP Inrush - consult TRN
23. CAP Inrush - consult TRN
24. CAP Inrush - consult TRN
25. CAP Inrush - consult TRN
26. Reserved / NC
27. Shutdown
28. -V in
29. -V in
30. -V in
Maximum Weight:
Dual Output:
30 grams
Notes:
1. All specifications are typical at nominal input and
full load unless otherwise noted.
2. Specification subject to change without notice.
3. Mechanical drawings for reference only.
4. Minimum Load: 0.2 A (min 15%).
5. Max. Capacitive Load: 330 m.
6. Warranty: 1 yr
Pin Assignments
AK42A
A
s
t
e
c
C
o
n
v
e
n
tional
Pow
e
r
Derating Curve
(T
ref
<105C)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
20
30
40
50
60
70
80
90
100
110
Ambient Temperature (C)
T
ref
between pins 26&27
Output Power/Max. Rated Output
Power
Free Convection
(50LFM)
200LFM
400LFM
600LFM
NOTES:
1. All dimensions in mm
and (inches)
2. Basic Tolerances:
.X 0.05 (0.02)
.XX 0.25 (0.010)
3.18
(0.125)
12.70
MAX
(.500)
47.90
(1.886)
49.12
(1.934)
50.8
(2.00)
35.43
(1.395
6.34
(0.250)
1.27 REF
(0.050)
2.54 TYP
(0.100
38.10
(1.500)
39.6
30.63
(1.56)
(1.206)
2.97
(0.117)
2.54 TYP
(0.100)
48.01
(1.890)
3.56 TYP
(0.140)
1.27 TYP
(0.050)
30
16
15
1
69
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