Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
ALQ25 Single Output Open-Frame DC-DC Converter Module
Industry Standard
¼
Brick: 36V-75V Input / 5V Output
The ALQ25 series is Astec's next generation single output, high-density standard quarter brick offering. It operates from a 36V
to 75V DC Bus and comes in different Isolated Logic Output voltages (ILO) well suited for DPA applications. It’s designed to
conservatively handle 25A of output current for 5V and at high levels of efficiency (5V @ 91%). It provides tight regulation
and exhibits clean and monotonic output start up characteristics. The ALQ25’s come with industry standard features such as
Input UVLO, OCP, OVP, OTP, Output Trim, differential output Sense pins.
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
91% (Typ)
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
Load Current
Load Regulation
Ripple and Noise
Output Voltage
Adjust Range
Transient Response
5.0V @ 25A max
Line Regulation 0.2 % Vo
0.4 % V
O
150mV
PK-PK
max for 5V
Special Features
•
•
•
•
•
•
•
•
Industry Standard ¼ Brick Footprint
Positive and Negative Enable Options
Regulation to Zero Load
High Capacitive Load Start-up
Fixed Switching Frequency at 200kHz
Output Trim
Input Under-Voltage Lockout
Low profile / open-frame
Remote Sense
Over Current
Protection
±10% V
O
5% V
O
deviation (Typ)
50% to 75% Load Change
400µsec settling time (Typ)
µ
+10% V
O
140% I
O,MAX
Environmental Specifications
•
•
•
-40ºC to 85ºC Operating Temperature
(200LFM)
-40ºC to 120ºC Storage Temperature
MTBF > 1 million hours
Safety
UL + cUL 60950, Recognized (Pending)
EN60950 through TUV-PS (Pending)
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
SHEET 1 OF 15
Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
ALQ25 Series
THIS SPECIFICATION COVERS THE REQUIREMENTS FOR A NEW ¼-BRICK SIZE
25A SINGLE OUTPUT HIGH EFFICIENCY DC/DC CONVERTER.
MODEL NAME
ALQ25A48
ALQ25A48N
ALQ25A48-7
ALQ25A48N-7
OPTIONS:
Negative Enable:
Positive Enable:
5.8mm pin option
V
OUT
/ I
OUT
CONSTRUCTION
5.0V/25A
5.0V/25A
5.0V/25A
5.0V/25A
SUFFIX
"N"
No suffix
-7
Serial No. Prefix
B737
B742
C511
C514
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
SHEET 2 OF 15
Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
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)
See derating curve
48V
±
2V
Dependent on model series
Return pin for +V
IN
Connected to Load (return)
Connected to -V
OUT
Open
Connected to +V
OUT
Connected to Load
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
(200LFM)
Storage Temperature
Operating Humidity
Max Output Power
Device
All
All
All
All
All
All
A (5.0V)
Symbol
V
IN
V
I N, trans
Min
0
0
-
-40
-40
-
-
Typ
-
-
-
-
-
-
-
Max
80
100
1500
+85
120
85
125
Unit
Vdc
Vdc
Vdc
ºC
ºC
%
W
T
A
T
STG
-
P
O
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
SHEET 3 OF 15
Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
INPUT SPECIFICATION
Parameter
Operating Input Voltage
Input Under-Voltage Lock-out
T_ON Threshold
T_OFF Threshold
Maximum Input Current
1
Conditions: V
IN
=V
IN,min
I
O
= I
O,max
; T
A
= 25 ºC
Max P
DISS
@ I
O
= 0A (V
IN
= V
IN,NOM
)
Input Reflected Ripple Current
2
Conditions: P
O
= P
O,max
; T
A
= 25 ºC
BW: 5Hz to 20MHz
Note:
Device
All
All
31
30
-
34
33
-
36
35
6
Vdc
A
Symbol
V
IN
Min
36
Typ
48
Max
75
Unit
V
DC
A (5.0V)
I
IN,max
A (5.0V)
-
-
7.5
W
All
I
I1
/ I
I2
-
-
260
mA
PK-PK
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
Device
A (5.0V)
Symbol
V
O,SET
Min
4.9
Typ
5.0
Max
5.1
Unit
Vdc
Max
A (5.0V)
A (5.0V)
-
-
-
-
0.1
0.2
0.2
0.4
%Vo
%Vo
% /
°C
mVp-p
Temperature: Ta = -40 ºC to
+85ºC
Ripple and Noise
3
Peak-to-Peak: (5Hz to 20MHz)
Output Current
4
External Load Capacitance
Output Current-limit Inception
V
OUT
= 90% V
O,SET
A (5V)
-
-
-
-
0.02
150
A (5V)
A (5V)
A (5V)
I
O
-
I
O
0
470
27.5
-
-
-
25
8000
35
A
µF
A
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
SHEET 4 OF 15
Technical Reference Notes
ALQ25 Series
(Open Frame Single Output Quarter Brick)
OUTPUT SPECIFICATIONS
Parameter
Over Voltage Protection Range
Device
A (5.0V)
Symbol
Min
6
Typ
Max
7
Unit
V
Over Temperature Range
(AVG PCB TEMPERATURE)
All
A (5.0V)
η
110
89
-
91
120
-
-
-
-
20
°C
%
Efficiency
V
IN
= V
IN-NOM
; I
O
= I
O,MAX
T
A
=25°C
Turn-On Response Time
V
IN
= V
IN-MIN to
V
IN-MAX
Switching Frequency
Dynamic Response
5
:
∆I
O
/∆t=0.1A / uS
All
All
-
-
-
-
-
-
200
ms
KHz
-
0.1
-
A/µs
mV
µs
Load Change from I
O
= 10% to 100% of
I
O, Max
:
Peak Deviation Settling Time to V
O, Nom
5V
-
-
-
-
-
-
500
250
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
Note:
5V
All
-
-
-
-
-
-
-
-
250
400
-
mV
µs
%Vo
5
3. See Figure 2 for Ripple and Noise test measurement setup.
4. Appropriate Thermal Derating applies. See Figure 13 for the Thermal Derating Curves
5. The Dynamic Deviation and Recovery time are defined as below
MODEL: ALQ25 SERIES
Dec 1, 2003 - REVISION B
SHEET 5 OF 15
