Special Features
Electrical Specs
240 Watts
AK80A
High efficiency - up to 87%
500 KHz fixed frequency
85C baseplate operating
temperature (with no derating)
Low output ripple and noise
Excellent transient response
High reliability - over 1 million hours MTBF
Wide input voltage range
TTL compatible enable control
Parallelable
Adjustable output voltage and current limit
Temperature monitor output
Overtemperature and short circuit
protection
Regulation to zero load
Operating temperature (baseplate):
0C to +85C
Storage temperature: -40C to +105C
Overtemperature protection: 90C typical
MTBF: > 1 million hours (50C baseplate)
UL
UL 1950
E132002
CSA
CSA22.2-234
LR53982C
CSA22.2-950
VDE
IEC950
20366-3336-1002 & 1008
EN
60950
CE
CEMark (LVD)
Input
Input Range
18 to 36 VDC
Efficiency
83% typical @
5V;
87% typical
@ 12V;
87% typical
@ 15V
Output
Load Regulation
0.3% typical down to no load
Line Regulation
0.1% typical
Noise/Ripple
100 mV typical (output below 5V)
2% typical (output 5V and over)
Remote sense
Up to 0.5V
Output Voltage
Adjust Range
10% of nominal output
Transient Response
10% typical deviation with 300s
recovery (25-75% full load)
Current Share Accuracy
5% typical
Overvoltage Protection
130% nominal Vo
Current Limit
115% Io max
Control
Voltage Adjust
90 to 110% Vo
Enable
TTL compatible (low to enable)
Current Limit Adjust
20 to 100% Io rated
Clock Input
(external sync)
3.5 to 5Vp-p @ 1MHz 10%
Clock Output
(internal clock)
4.4 to 5.5Vp-p @ 1MHz 0.5%
Power
Good/Identification
High (Vo) = power good
Temperature
Monitor Output
10 mV/K (2.73V = 0C)
Notes
Nominal values apply with sense pins connected and other control
pins unconnected.
Specifications subject to change without notice.
Environmental
Total Power:
240 Watts
Input Voltages:
24V
No. of Outputs:
Single
Safety
A
s
t
e
c
Int
egrat
ed
Pow
e
r
America's (USA): 1-888-41-ASTEC
Europe (UK): 44 (1384) 842-211
Asia (HK): 852-2437-9662
52
W9959_02_DCDC_001-073_73 2/8/02 3:55 PM Page 52
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
Output
Output
Model Number
Voltage
Voltage
Current
24V
3.3V
40A
AK80A-024L-033F40
24V
5V
30A
AK80A-024L-050F30
24V
12V
14A
AK80A-024L-120F14
24V
15V
12A
AK80A-024L-150F12
24V
24V
8A
AK80A-024L-240F08
Please contact Astec for information on other output voltages, power ranges and configurations.
Input
Output
Control Pins
31. +ve
21. +ve
1. +SENSE
32. ve
22. +ve
2. PG/ID
23. +ve
3. V ADJ
24. +ve
4. -SENSE
26. -ve
5. S COM
27. -ve
6. C SHARE
28. -ve
7. CLK OUT
29. -ve
8. CLK IN
9. ENABLE
10. C LIM ADJ
11. TEMP MON
12. PRI AUX
Pin Assignments
Secondary
side
controls
Primary
side
controls
AK80A
A
s
t
e
c
Int
egrat
ed
Pow
e
r
THERMAL BASE PLATE
*
2 INPUT PINS
4 SECONDARY SIDE
CONTROL PINS
8 OUTPUT PINS
116.8 (4.60)
61.0 (2.40)
29
2
1
28
27
26
24
23
22
21
5
8
32
31
AMPSSTM POWER MODULE
12.7
(0.50)
3
4
12
9
8 PRIMARY SIDE
CONTROL PINS
Load
+ SENSE
SENSE
C SHARE
1
4
+ SENSE
SENSE
C SHARE
CLK OUT
5
CLK IN
+ O/P
O/P
3
2
12
8
1
4
5
3
2
9
12
8
9
ENABLE
ENABLE
S COM
S COM
Load
+ SENSE
SENSE
+ O/P
O/P
18 to 36V
or
36 to 72V
+ I/P
I/P
9
8
1
4
Current limit adjust
Output voltage adjust
Enable
(close to enable)
Temperature monitor output
(e.g. to fan control circuit)
PG/ID goes high (to Vo) to indicate power good.
Resistance between PG/ID and +O/P
with no power applied indicates nominal
O/P voltage, where 1K Ohm = 1 volt
(eg 3K3 = 3.3 V).
3
2
12
5
53
www.astec.com
W9959_02_DCDC_001-073_73 2/8/02 3:55 PM Page 53
PDF 
ZIP