Technical Reference Notes
AEO_ALO04/12/20/25x48 Series
(Single Output 8
th
Brick)
AEO/ALO Single Output 8
th
Brick: Baseplate or Open-Frame Module
The AEO_ALO04/12/20/25x48 series is Astec’s Low Current 8
th
Brick industry standard offering. Operating from an input
voltage range of 36V to 75V, the series provides 7 configured outputs starting from 1.2V all the way up to 12V. It delivers up
to 25A max current for 1.8V and lower voltages at impressive levels of efficiency. It provides tight regulation and exhibits
clean and monotonic output start up characteristics. The AEO_ALO series comes with industry standard features such as Input
UVLO; non-latching OCP, OVP and OTP; Output Trim; Differential Remote Sense pins. Both baseplate (AEO) and open
frame (ALO) construction are available as well as TH and SMT termination. With its wide operating temperature range of
-40°C to 85°C ambient, the converters are deployable into almost any environment.
Electrical Parameters
Input
Input Range
Input Surge
36-75 VDC
100V / 100ms
Control
Enable
TTL compatible
(Positive or Negative Logic Enable Options)
Output
Load Current
Line/Load Regulation
Ripple and Noise
Output Voltage
Adjust Range
Transient Response
Remote Sense
Over Current
Protection
Over Voltage
Protection
Over Temperature
Protection
Up to 25A max (V
O
≤
1.8V)
< 1% V
O
20mV
P-P
typical at 1.8V
±10% V
O
2% Typical deviation
50% to 75% step load
250µs settling time (Typ)
+10%V
O
120% (Typ)
130% (Typ)
110
°C
Special Features
•
•
•
•
•
•
•
•
Industry Standard 8
th
Brick Footprint
Baseplate or Open frame construction
Low Ripple and Noise
Regulation to zero load
High Capacitive Load Start-up
Fixed Switching Frequency
Industry standard features: Input UVLO;
Enable; non-latching OVP, OCP and OTP;
Output Trim, Differential Remote Sense
Meets Basic Insulation
Environmental Specifications
•
•
•
-40ºC to 85ºC Operating Temperature
-55ºC to 125ºC Storage Temperature
MTBF > 1 million hours
Safety
UL + cUL 60950, Recognized
EN60950 through TUV-PS
MODEL: AEO_ALO04/12/20/25x48 SERIES
AUGUST 25, 2005 - REVISION G
SHEET 1 OF 26
Technical Reference Notes
AEO_ALO04/12/20/25x48 Series
(Single Output 8
th
Brick)
Electrical Specifications
ABSOLUTE MAXIMUM RATINGS
Stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. Functional
operation of the device is converter is not implied at these or any other conditions in excess of those given in the
operational section of the specs. Exposure to absolute maximum ratings for extended period can adversely affect
device reliability.
Parameter
Input Voltage
Continuous
Transient (100ms)
I/O Isolation
Input-to-Output
Operating Temperature
Storage Temperature
Operating Humidity
Max Voltage at Enable Pin
Max Output Power
1
Device
All
Symbol
Vin
Vin
trans
-
T
A
T
STG
-
P
O, MAX
Min
-0.3
-
1500
-40
-55
10
-0.6
-
-
-
-
-
-
-
Typical
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Max
75
100
-
85
125
85
25
48.0
60.0
66.0
50.0
45.0
37.5
30.0
Unit
Vdc
All
All
All
All
All
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
Vdc
ºC
ºC
%
Vdc
W
INPUT SPECIFICATIONS
Parameter
Operating Input Voltage Range
Input Under-Voltage Lock-out
T_ON Threshold
T_OFF Threshold
Max Input Current
2
Device
All
All
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
Iin
max
Symbol
V
IN
Min
36
33
31
-
-
-
-
-
-
-
-
-
-
-
-
-
Typical
48
34
32
-
-
-
-
-
-
-
-
-
-
-
-
-
Max
75
36
34
1.7
2.3
2.4
1.9
1.8
1.6
1.4
5.75
4.00
4.00
4.00
3.00
2.50
2.00
Unit
Vdc
Vdc
A
Standing Loss
Vin = Vin
nom
W
MODEL: AEO_ALO04/12/20/25x48 SERIES
AUGUST 25, 2005 - REVISION G
SHEET 2 OF 26
Technical Reference Notes
AEO_ALO04/12/20/25x48 Series
(Single Output 8
th
Brick)
Electrical Specifications (continued)
INPUT SPECIFICATIONS
Parameter
Input Ripple Current
3
Inrush Current
i
2
t
OUTPUT SPECIFICATIONS
Parameter
Output Voltage Set point
V
IN
= V
IN, MIN
to V
IN, MAX
I
O
= I
O, MAX
Device
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
All
Symbol
V
O, SET
Min
11.80
4.90
3.25
2.45
1.76
1.47
1.17
-
-
-
Typical
12.00
5.00
3.30
2.50
1.80
1.50
1.20
0.1
0.1
0.5
Max
12.20
5.10
3.35
2.55
1.84
1.53
1.23
0.2
0.5
1.0
Unit
Vdc
Device
All
All
Symbol
I
I1
Min
-
-
Typical
10
0.01
Max
20
-
Unit
mAp-p
A
2
s
Output Regulation
Line
V
IN
= V
IN, MIN
to V
IN, MAX
Load
V
IN
= V
IN, NOM
I
O
= I
O, MIN
to I
O, MAX
Temp
V
IN
= V
IN, NOM
; I
O
= I
O, MAX4
Output Current
4
-
-
-
%
Output Ripple and Noise
5
Peak-to-Peak
I
O
= I
O, MAX
; V
IN
=V
IN, N OM
BWL = 20 MHz; T
A
=25
o
C
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2))
I
O
-
-
-
-
0
0
0
0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
50
40
40
20
20
20
20
4
12
20
20
25
25
25
120
90
75
75
60
60
60
A
mVp-p
MODEL: AEO_ALO04/12/20/25x48 SERIES
AUGUST 25, 2005 - REVISION G
SHEET 3 OF 26
Technical Reference Notes
AEO_ALO04/12/20/25x48 Series
(Single Output 8
th
Brick)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Output Current-limit Inception
V
O
= 90% V
O, NOM
; T
A
= 25ºC
V
IN
= V
IN, NOM
Non-latching / auto-recovery
Device
B (12V0)
A (5V0)
F (3V3)
G (2V5)
Y (1V8)
M (1V5)
K (1V2)
All
B (12V0)
Symbol
I
O, OCP
Min
5.0
16.0
23.5
23.5
27.0
27.0
27.0
-
-
4
92.0
92.0
90.0
89.0
88.5
87.0
85.0
13.8
5.80
3.80
2.90
2.10
1.75
1.38
110
110
-
-
-
-
-
-
-
380
-
90
-
Typical
-
-
-
-
-
-
-
-
-
Max
7.8
23.9
30.0
30.0
48.0
48.0
48.0
10,000
1,500
-
94.0
94.0
93.0
92.0
91.0
90.5
88.0
15.0
6.20
4.30
3.20
2.50
2.38
1.80
120
120
17
20
17
20
9
11
16
520
10
110
3
Unit
A
External Load Capacitance
I
O
= I
O, MAX
, resistive load
Capacitor ESR
Efficiency
V
IN
= V
IN, NOM
; I
O
= I
O, MAX
T
A
= 25ºC
C
EXT
µF
mΩ
%
B (12V)
A (5.0V)
F (3.3V)
G (2.5V)
Y (1.8V)
M (1.5V)
K (1.2V)
B (12V)
A (5.0V)
F (3.3V)
G (2.5V)
Y (1.8V)
M (1.5V)
K (1.2V)
AEO
ALO
All
5V, 12V
All
η
η
η
η
η
η
η
V
O, OVP
93.0
93.0
91.0
90.0
90.0
88.5
87.0
14.4
6.00
4.00
3.00
2.30
1.85
1.50
-
-
-
-
-
-
3
4
9
450
-
0
Output Over Voltage Protection
Non-latching / autorecovery
V
Over Temperature Protection
Input to Output Turn-On Delay
V
IN
= V
IN, NOM
I
O
= I
O, MAX
Enable to Output Turn-On Delay
V
IN
= V
IN, NOM
I
O
= I
O, MAX
Output Voltage Rise Time
10% to 90% of V
O
V
IN
= V
IN, NOM
I
O
= I
O, MAX
Switching Frequency
Output Voltage Remote Sensing
Output Voltage Trim Range
6
Output Voltage Overshoot
°C
ms
ms
-
-
-
-
-
-
-
F
SW
-
-
All
5V
12V
All
All
All
All
ms
kHz
%V
O
%V
O
%Vo
MODEL: AEO_ALO04/12/20/25x48 SERIES
AUGUST 25, 2005 - REVISION G
SHEET 4 OF 26
Technical Reference Notes
AEO_ALO04/12/20/25x48 Series
(Single Output 8
th
Brick)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Dynamic Response
di/dt = 0.1 A/µs
Peak Deviation
∆I
O
= 50% to 75% of Io
max
Settling Time
Vref = Vo
nom
Peak Deviation
∆I
O
= 50% to 25% of Io
max
Settling Time
Vref = Vo
nom
Output Enable ON/OFF
Open collector TTL compatible
Positive Enable: Mod-ON
Mod-OFF
Negative Enable: Mod-ON
Mod-OFF
Device
Symbol
Min
Typical
Max
Unit
All
All
All
All
-
-
-
-
-
-
-
-
2
-
2
-
5
250
5
250
%
µs
%
µs
All
All
All
All
-
-
-
-
2.95
-0.5
-0.5
2.95
-
-
-
-
20
1.20
1.20
20
V
V
V
V
Note: 1. Derating curves for both openframe and baseplate modules are based on derated component junction
temperatures of 120°C or less where applicable.
2. An input line fuse is recommended for use (e.g. Littlefuse type 314 – 4A max, 250V min or equivalent).
3. Refer to Figure 1 for Input Ripple Current test measurement setup.
4. Output derating applies at elevated temperature.
5. Refer to Figure 2 for output ripple measurement setup.
6. Refer to the output trim equations provided (Equations 1 and 2).
SAFETY AGENCY / MATERIAL RATING / ISOLATION
Parameter
Safety Approval
Material Flammability Rating
Parameter
Input to Output Capacitance
Input to Output Resistance
Input to Output Insulation Type
Device
All
All
Device
All
All
All
UL/cUL 60950, 3rd Edition – Recognized
EN 60950 through TUV
UL94V-0
Symbol
Min
Typical
Max
-
1000
-
-
TBD
-
-
Basic
-
Unit
pF
Ohms
-
MODEL: AEO_ALO04/12/20/25x48 SERIES
AUGUST 25, 2005 - REVISION G
SHEET 5 OF 26
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