Technical Reference Notes
AEH/ALH80 Series
The AEH/ALH80 series is part of Astec's next generation single output, high-density industry standard half bricks. It operates
from a 36V to 75V DC Bus and comes in three different Isolated Logic Output voltages (ILO) well suited for DPA
applications. It’s designed to handle 80A maximum output current for 1.8V, 1.5V and 1.2V at high levels of efficiency. It
provides tight regulation and exhibits clean and monotonic output start up characteristics. The AEH/ALH80 comes with
industry standard features such as Input UVLO, OCP, OVP, OTP, output Trim, differential output Sense pins. It comes either
with baseplate or open frame construction, with double pair or single pair (option) output pins.
AEH/ALH80 Single Output Baseplate/Open-Frame DC-DC Converter Module
Industry Standard
½
Brick: 36V-75V Input / 80A Output Current
PRELIMINARY
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
1.8V @ 87.0%
1.5V @ 85.5%
1.2V @ 83.0%
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
Special Features
•
•
•
•
•
•
•
•
•
Industry Standard ½ Brick Footprint
Positive and Negative Enable Options
Regulation to Zero Load
High Capacitive Load Start-up
Fixed Switching Frequency at 400kHz
Output Trim
Input Under-Voltage Lockout
Low profile / open-frame
Double pair or single pair output pins option
Load Current
Line/Load Regulation
Ripple and Noise
Output Voltage
Adjust Range
Transient Response
Remote Sense
Over Current
Protection
80A max
< 1% V
O
50mV
PK-PK
(Typ)
±10% V
O
5% V
O
deviation (Typ)
50% to 75% Load Change
250µsec settling time (Typ)
+10%V
O
120% I
O,MAX
Environmental Specifications
•
•
•
-40ºC to 85ºC Operating Temperature
-40ºC to 125ºC Storage Temperature
MTBF > 1 million hours
Safety
UL + cUL 60950, Recognized (Pending)
EN60950 through TUV-PS (Pending)
MODEL: AEH/ALH80 SERIES
MAY 19, 2003 - REVISION A (PRELIMINARY)
SHEET 1 OF 16
Technical Reference Notes
AEH/ALH80 Series
AEH/ALH80 Series
MODEL NAME
AEH80Y48
AEH80M48
AEH80K48
ALH80Y48
ALH80M48
ALH80K48
CONSTRUCTION
Baseplate adapted
Baseplate adapted
Baseplate adapted
Open Frame; Low Profile
Open Frame; Low Profile
Open Frame; Low Profile
SUFFIX
"N"
No suffix
“-3”
No suffix
V
OUT
/ I
OUT
1.8V / 80A
1.5V / 80A
1.2V / 80A
1.8V / 80A
1.5V / 80A
1.2V / 80A
OPTIONS:
Negative Enable:
Positive Enable (Default):
Single Pair Output Pins:
Redundant Output Pins (Default):
MODEL: AEH/ALH80 SERIES
MAY 19, 2003 - REVISION A (PRELIMINARY)
SHEET 2 OF 16
Technical Reference Notes
AEH/ALH80 Series
Electrical Specifications
STANDARD TEST CONDITION
on a single module unless otherwise specified.
T
A
Airflow
+V
IN
Enable
-V
IN
-V
OUT
-Sense
Trim
+Sense
+Vout
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
25°C (Ambient Air)
Refer to Figures 21 to 24
Return pin for +V
IN
Dependent on model series
48V
±
2V
Connected to Load
Connected to +V
OUT
Open
Connected to -V
OUT
Connected to Load (return)
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
1
Continuous
Transient (100ms)
Isolation Voltage
Input to Output
Operating Ambient Temperature
Storage Temperature
Operating Humidity
Maximum Enable Voltage
Max Output Power
Device
All
All
All
All
All
All
All
Y (1.8V)
M (1.5V)
K (1.2V)
Symbol
V
I N, trans
T
A
T
STG
-
P
O
P
O
P
O
V
IN
Min
0
0
1500
-40
-40
-
-
-
-
Typ
-
-
-
-
-
-
-
-
-
Max
75
100
-
+85
125
85
25
144
120
96
Unit
Vdc
Vdc
Vdc
ºC
ºC
%
Vdc
W
W
W
MODEL: AEH/ALH80 SERIES
MAY 19, 2003 - REVISION A (PRELIMINARY)
SHEET 3 OF 16
Technical Reference Notes
AEH/ALH80 Series
Electrical Specifications (continued)
INPUT SPECIFICATION
Parameter
Device
Symbol
Min
Typ
Max
Operating Input Voltage
All
V
IN
36
48
75
Input Under-Voltage Lock-out
All
T_ON Threshold
34.0
34.8
35.5
T_OFF Threshold
32.5
33.5
34.5
1
Maximum Input Current
-
-
Y (1.8V)
5.2
I
IN,max
Conditions: V
IN
=V
IN,min
-
-
M (1.5V)
4.4
I
O
= I
O,max
; T
A
= 25 ºC
-
-
K (1.2V)
3.6
Max P
DISS
@ I
O
= 0A (V
IN
= V
IN,NOM
)
All
-
-
5
2
Input Reflected Ripple Current
-
-
15
All
I
I1
/ I
I2
Conditions: P
O
= P
O,max
; T
A
= 25 ºC
BW: 5Hz to 20MHz
Note: 1. An input line fuse is recommended for use.
2. External input capacitance required. See Input Ripple Current test measurement setup on Fig 1.
OUTPUT SPECIFICATIONS
Parameter
Output Voltage Set point
V
IN
= V
IN, min
to V
IN, max;
I
O
=I
O,Max
Output Regulation
Line: V
IN
= V
IN, Min
to V
IN,
Load: I
O
= I
O, Min
to I
O, Max
Temperature: Ta = -40 ºC to
+85ºC
Ripple and Noise
3
Peak-to-Peak: (5Hz to 20MHz)
Output Current
4
External Load Capacitance
Capacitor ESR
Output Current-limit Inception
V
OUT
= 90% V
O,SET5
Over Voltage Protection Range
6
Over Temperature Range
7
(AVG PCB TEMPERATURE)
Unit
V
DC
Vdc
A
W
mA
PK-PK
Device
1V8 (Y)
1V5 (M)
1V2 (K)
Max
Symbol
V
O,SET
Min
1.770
1.475
1.180
-
-
-
-
-
Typ
1.800
1.500
1.200
0.3
0.1
0.1
0.3
-
50
-
-
-
-
2.40
1.90
1.50
-
87.0
85.5
83.0
Max
1.830
1.525
1.220
0.6
0.4
0.4
0.7
1.0
100
80
50,000
-
100
2.90
2.50
2.10
120
-
-
-
Unit
Vdc
Vdc
Vdc
%Vo
All
1V8 (Y)
All
1V2 (K)
All
All
All
All
All
1V8 (Y)
1V5 (M)
1V2 (K)
All
1V8 (Y)
1V5 (M)
1V2 (K)
η
η
η
-
I
O
-
I
O
-
0
-
4
83
2.20
1.80
1.44
110
86.0
84.5
82.0
mVp-p
A
µF
mΩ
A
V
°C
%
%
%
Efficiency
V
IN
= V
IN-NOM
; I
O
= I
O,MAX
T
A
=25°C
MODEL: AEH/ALH80 SERIES
MAY 19, 2003 - REVISION A (PRELIMINARY)
SHEET 4 OF 16
Technical Reference Notes
AEH/ALH80 Series
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Turn-On Response Time
V
IN
= V
IN-MIN to
V
IN-MAX
Switching Frequency
Dynamic Response:
∆I
O
/∆t=0.1A / uS
C
O
= 0uF
Load Change from I
O
= 50% to 75% of
I
O, Max
:
Peak Deviation Settling Time to V
O, Nom
Load Change from I
O
= 50% to 25% of
I
O, Max
:
Peak Deviation Settling Time to V
O, Nom
Output Overshoot
at T-on / T-off
Passive Resistive Full Load
Output Enable ON/OFF
Negative Enable ("N" suffix)
Enable Pin voltage for Module ON
Module OFF
Positive Enable (No suffix)
Enable Pin voltage for Module ON
Module OFF
Output Voltage Remote Sensing
8,10
Output Voltage Trim Range
9,10
Note:
Device
All
All
Symbol
-
-
-
All
-
-
All
All
-
-
-
Min
-
360
-
-
-
-
-
-
Typ
4
400
0.1
-
-
-
-
0
Max
10
440
-
200
500
200
500
4
Unit
ms
KHz
A/µs
mV
µs
mV
µs
%Vo
N suffix
-
-
-
-
-
-0.7
2.95
2.95
-0.7
-
90
-
-
-
-
-
1.2
10.0
10.0
1.2
10
110
V
V
V
%V
O
%V
O
No suffix
All
All
3. See Figure 2 for Ripple and Noise test measurement setup. Output ripple may exceed max limits at high
line condition.
4. Appropriate Thermal Derating applies. See Figures 17 to 22 for the Thermal Derating Curves
5. In an event of an over current condition - the converter will be latched off. Restart is possible either by
cycling the input voltage or toggling the Enable signal for 100ms. Consult factory for Auto restart
option.
6. The OVP mode is latching. The converter will be latched off once the sensed voltage across the output
pins exceeds the threshold limits. Restart is possible by either cycling the input voltage or toggling the
Enable signal for 100ms.
7. Output of the module will be terminated once the operating temp reaches the OTP range. Normal
operation resumes once the temperature falls below the OTP range.
8. The sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur
along the connection between the output pins to the load. Pin 9 (+Sense) and Pin 7 (-Sense) should be
connected to Pin 10/11 (+Vout) and Pin 5/6 (Return) respectively at the point where regulation is desired.
9. Refer to Equation (1) and (2) and Figures 3 and 4 for the Output Trim Adjust configuration.
10. The combination of remote sense and Trim adjust cannot exceed 110% of V
O, NOM
.
MODEL: AEH/ALH80 SERIES
MAY 19, 2003 - REVISION A (PRELIMINARY)
SHEET 5 OF 16
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