Technical Reference Notes
ALQ15XX48X Series
(Open Frame Dual Output Quarter Brick)
ALQ15 Dual Output Open-Frame DC-DC Converter Module
Industry Standard
¼
Brick: 36V-75V Input / 60W Output Power
The ALQ15 series is Astec's latest dual output; high-density converter offering that comes in an industry standard ¼ brick
open-frame package. With its independently controlled output rails, the module effectively minimizes cross regulation, which
has been an issue to most dual converters available in the market. The ALQ15 series has been designed to deliver 60W of
clean, well-regulated, low noise DC power for today's demanding loads at respectable efficiency levels: 3.3V-2.5V
combination @ 87.5% (60W output power). Output combinations currently available are 5.0V/3.3V - 3.3V/2.5V - 3.3V/1.8V -
2.5V/1.5V, with each output rail able to deliver 15A max (5V@12A). The module comes with standard feature sets such as
output enable with positive or negative options; output voltage-adjust; over current, over voltage and over temperature
protection. In addition, it is also being offered at both 5mm (std) and 3.7mm pin lengths.
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
5.0V/3.3V @ 89% (Typ at 60W)
3.3V/2.5V @ 87%
3.3V/1.8V @ 86%
2.5V/1.5V @ 84%
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Special Features
•
•
•
•
•
•
•
•
•
•
Tight Regulation
Low Ripple and Noise at < 30mV
PK-PK
Industry Standard ¼ Brick Footprint
Positive and Negative Enable Options
Regulation to Zero Load
High Capacitive Load Start-up
Fixed Switching Frequency
Output Trim
Input Under-Voltage Lockout
Basic Insulation
Output
Load Current
15A max per channel (60W max)
5V @ 12A max
Line/Load Regulation < 10mV (Typ)
Ripple and Noise
30mV
PK-PK
max
Output Voltage
Adjust Range
±10% Vo
Transient Response 3% V
O
deviation max (3.3V)
50% to 75% Load Change
220
µ
sec typical settling time
(for 3.3V)
Over Current
Protection
130% I
O,max
typical
Environmental Specifications
•
•
•
-40ºC to 85ºC Operating Temperature
-40ºC to 125ºC Storage Temperature
Designed for > 1 million hours MTBF
Safety
UL + cUL 60950, Recognized (Pending)
EN60950 through TUV-PS (Pending)
MODEL: ALQ15 SERIES
JANUARY 24, 2003 - REVISION B
SHEET 1 OF 19
Technical Reference Notes
ALQ15XX48X Series
(Open Frame Dual Output Quarter Brick)
ALQ15 SERIES
MODEL NAME
ALQ15AF48
ALQ15FG48
ALQ15FG48N-6D*
ALQ15FY48
ALQ15GM48
CONSTRUCTION
Open Frame
Open Frame
Open Frame
Open Frame
Open Frame
SUFFIX
"N"
No suffix
"-6"
V
OUT
/ I
OUT
5.0V-12A / 3.3V-15A
3.3V-15A / 2.5V-15A
3.3V-15A / 2.5V-15A
3.3V-15A / 1.8V-15A
2.5V-15A / 1.5V-15A
OPTIONS:
Negative Enable:
Positive Enable:
3.7mm (nominal) Pin Length:
* Check Part Numbering Scheme on Table 2 and the corresponding external trim
function on Table 1-D
MODEL: ALQ15 SERIES
JANUARY 24, 2003 - REVISION B
SHEET 2 OF 19
Technical Reference Notes
ALQ15XX48X Series
(Open Frame Dual Output Quarter Brick)
Electrical Specifications
STANDARD TEST CONDITION
on a single module unless otherwise specified.
TA:
+V
IN
:
ENABLE:
-V
IN
:
+V
OUT2
:
-V
OUT
:
TRIM:
+V
OUT1
:
Airflow
25ºC (Ambient Air)
PIN 1
48V ± 2V
PIN 2
Open (Positive Enable)
PIN 3
Return Pin for +VIN
PIN 4
Connect to Load 2
PIN 5
Return Pin for Load 1 & 2
PIN 6
Open
PIN 7
Connect to Load 1
Refer to the appropriate derating curve
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) :
Operating Ambient Temperature
1
Storage Temperature
Operating Humidity
I/O Isolation
Maximum Enable Voltage
Device
All
All
All
All
All
All
All
Symbol
V
I N, trans
T
A
T
STG
-
-
V
IN
Min
0
0
-40
-55
-
1500
Typ
-
-
-
-
-
-
Max
75
100
+85
125
85
-
TBD
Unit
Vdc
Vdc
ºC
ºC
%
Vdc
Vdc
NOTE: 1. Power Derating applies. Refer to Figures 15 to 18.
MODEL: ALQ15 SERIES
JANUARY 24, 2003 - REVISION B
SHEET 3 OF 19
Technical Reference Notes
ALQ15XX48X Series
(Open Frame Dual Output Quarter Brick)
Electrical Specifications (continued)
INPUT SPECIFICATION
Parameter
Operating Input Voltage
Maximum Input Current
2
Conditions: V
IN
= between 0 to V
IN,min
P
O
= P
O,max
; T
A
= 25 ºC
Input Reflected Ripple Current
3
Conditions: P
O
= P
O,max
; T
A
= 25 ºC
Standing Loss
Condition: V
IN
= V
IN,nom
; T
A
= 25 ºC
Device
All
AF
FG
FY
GM
All
All
Symbol
V
IN
I
IN,max
Min
36
-
Typ
48
-
Max
75
2.20
2.20
2.20
2.27
25
2.8
Unit
V
DC
A
I
I1
/ I
I2
-
-
-
10
-
mA
PK-PK
W
NOTE: 2. The power module is not internally fused. An input line fuse (e.g. Little fuse 3AB /322003 or 314003) is
recommended.
3. See Figure 1 for Input Reflected Ripple Current Test Setup.
OUTPUT SPECIFICATIONS
Parameter
Voltage Setpoint
Conditions: V
I
= V
IN,nom
; T
A
= 25 ºC;
V
O1
: I
O1
= I
O,max
; P
O
= 60W
V
O2
: I
O2
= I
O,max
; P
O
= 60W
Load Current
Device
AF
FG
FY
GM
5.0V
3.3V
2.5V
1.8V
1.5V
AF
FG
FY
GM
5.0V
3.3V
2.5V
1.8V
1.5V
Symbol
V
O1
/ V
O2
V
O1
/ V
O2
V
O1
/ V
O2
V
O1
/ V
O2
I
O1
/I
O2
I
O1
/I
O2
I
O1
/I
O2
I
O1
/I
O2
I
O1
/I
O2
P
O
P
O
P
O
P
O
Min
4.93 / 3.25
3.25 / 2.46
3.25 / 1.76
2.46 / 1.47
0
0
0
0
0
-
-
-
-
-
-
-
-
-
Typ
5.00 / 3.30
3.30 / 2.50
3.30 / 1.80
2.50 / 1.50
-
-
-
-
-
-
-
-
-
0.06
0.03
0.03
0.03
0.03
Max
5.08 / 3.35
3.35 / 2.54
3.35 / 1.84
2.54 / 1.53
12.0
15.0
15.0
15.0
15.0
60
60
60
60
0.15
0.10
0.10
0.10
0.10
Unit
Vdc
A
Combined Output Power
P
O
= P
O1
+ P
O2
W
Line Regulation:
Conditions: V
IN
= V
IN, min
to V
IN, max
;
I
O1
= I
O, max
, I
O2
= I
O, min
V
IN
= V
IN, min
to V
IN, max
;
I
O1
= I
O, min
, I
O2
= I
O, max
%Vo
MODEL: ALQ15 SERIES
JANUARY 24, 2003 - REVISION B
SHEET 4 OF 19
Technical Reference Notes
ALQ15XX48X Series
(Open Frame Dual Output Quarter Brick)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Load Regulation
Conditions: I
O
= 1A to I
O,max
;
V
IN
=V
IN,nom
Cross Regulation
4
Conditions: V
IN
= V
IN,nom
, I
O
= I
O,max
Temperature
Conditions: T
A
= -40 ºC to +65 ºC;
V
IN
= V
IN,nom
; I
O
= I
O,max
Output Ripple and Noise:
Peak-to-Peak
5
Conditions: I
O
= I
O,max
; V
IN
=V
IN,nom
;
BW = 20 MHz;
T
A
=25
o
C
External Load Capacitance
6
Over Current Limit Inception
Conditions: Vo = 90% V
O,nom
;
I
O2
= I
O,min;
V
IN
= V
IN,nom
Characteristics: Hiccup mode,
auto-recovery
Output Short Circuit
Conditions: V
IN
= V
IN,nom
; I
O2
= 0A
T
A
= 25 ºC
4
Device
5.0V
3.3V
2.5V
1.8V
1.5V
All
Symbol
Min
-
-
-
-
-
-
Typ
0.06
0.12
0.20
0.26
0.33
-
Max
0.15
0.30
0.40
0.60
0.70
0.15
Unit
%Vo
%Vo
All
5.0
3.3
2.5
1.8
1.5
All
All
5.0V
I
O,OCP
I
O,OCP
-
-
-
-
-
-
-
16.5
13.2
-
12
12
12
18
18
-
-
-
1.75
25
25
25
30
30
10000
25
22
%Vo
mV
PK-PK
µF
A
All
I
OPK
I
ORMS
I
ODC
I
INS
η
η
η
η
-
-
-
28
5
1
150
90.5
88.5
87.5
85.0
375
A
PK
A
RMS
A
mA
%
Efficiency
Conditions: V
IN
= V
IN,nom
; T
A
= 25 ºC
P
O
= P
O,max
, balanced
current loading
Switching Frequency
Note: Can be determined from output
ripple waveform
AF
FG
FY
GM
All
89.0
87.0
86.0
83.0
-
89.5
87.7
86.5
84.0
300
KHz
NOTE: 4. Channel under test shall follow the specified conditions while the other channel is set to min load, 0A.
5. Channel under test shall be set to full load with the other channel set to I
O, min
- See Fig 2 for the
recommended output ripple and noise test setup.
6. Refer to YSC plots on Fig 19 and 20 to determine loop stability at various output load impedance.
MODEL: ALQ15 SERIES
JANUARY 24, 2003 - REVISION B
SHEET 5 OF 19
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