Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
ALQ50 Single Output Open-Frame DC-DC Converter Module
Industry Standard ¼ Brick: 36V-75V Input / 50A Output Current
PRELIMINARY
The ALQ50 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 50A of output current for 2.5V and below at high levels of efficiency (3.3V @ 90.5%). It provides tight
regulation and exhibits clean and monotonic output start up characteristics. The ALQ50’s come with industry standard features
such as Input UVLO, OCP, OVP, OTP, Output Trim, differential output Sense pins. With its 0.36” low profile and open frame
construction, it offers optimum board mounting flexibility.
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
3.3V @ 90.5% (Typ)
2.5V @ 90.0%
1.8V @ 89.0%
1.2V @ 86.5%
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
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 480kHz
Output Trim
Input Under-Voltage Lockout
Low profile / open-frame
Load Current
Line/Load Regulation
Ripple and Noise
Output Voltage
Adjust Range
Transient Response
Remote Sense
Over Current
Protection
2.5V @ 50A max
< 1% VO
60mVPK-PK max
±10% VO
5% VO deviation (Typ)
50% to 75% Load Change
250µsec settling time (Typ)
+10%VO
120% IO,MAX
Environmental Specifications
•
•
•
-40ºC to 85ºC Operating Temperature
-40ºC to 125ºC Storage Temperature
MTBF > 1 million hours
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
Safety
UL + cUL 60950, Recognized (Pending)
EN60950 through TUV-PS (Pending)
SHEET 1 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
ALQ50 Series
THIS SPECIFICATION COVERS THE REQUIREMENTS FOR A NEW ¼-BRICK SIZE
50A SINGLE OUTPUT HIGH EFFICIENCY DC/DC CONVERTER.
MODEL NAME
ALQ40F48
ALQ50G48
ALQ50Y48
ALQ50K48
CONSTRUCTION
Open Frame; Low Profile
Open Frame; Low Profile
Open Frame; Low Profile
Open Frame; Low Profile
OPTIONS:
Negative Enable:
Positive Enable:
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
VOUT / IOUT
3.3V / 40A
2.5V / 50A
1.8V / 50A
1.2V / 50A
SUFFIX
"N"
No suffix
SHEET 2 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Electrical Specifications
STANDARD TEST CONDITION on a single module unless otherwise specified.
TA
Airflow
+VIN
Enable
-VIN
-VOUT
-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 +VIN
Dependent on model series
48V ± 2V
Connected to Load
Connected to +VOUT
Open
Connected to -VOUT
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 Voltage1
Continuous
Transient (100ms)
Isolation Voltage
Input to Output
Operating Ambient Temperature
Storage Temperature
Operating Humidity
Maximum Enable Voltage
Max Output Power
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
Device
Symbol
Min
Typ
Max
Unit
All
All
VIN
VI N, trans
0
0
-
75
100
Vdc
Vdc
TA
TSTG
-
1500
-40
-40
-
-
PO
PO
PO
PO
-
-
+85
125
85
25
132
125
90
60
Vdc
ºC
ºC
%
Vdc
W
W
W
W
All
All
All
All
All
F (3.3V)
G (2.5V)
Y (1.8V)
K (1.2V)
SHEET 3 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Electrical Specifications (continued)
INPUT SPECIFICATION
Parameter
Operating Input Voltage
Input Under-Voltage Lock-out
T_ON Threshold
T_OFF Threshold
Maximum Input Current1
Conditions: VIN =VIN,min
IO = IO,max; TA = 25 ºC
Max PDISS @ IO = 0A (VIN = VIN,NOM)
Input Reflected Ripple Current2
Conditions: PO = PO,max; TA = 25 ºC
BW: 5Hz to 20MHz
Note:
Device
All
All
F (3.3V)
G (2.5V)
Y (1.8V)
K (1.2V)
3V3 (F)
2V5 (G)
1V8 (Y)
1V2 (K)
All
Symbol
VIN
IIN,max
II1/ II2
Min
36
Typ
48
Max
75
Unit
VDC
33
32
-
-
35
34
4.4
4.3
3.2
2.3
5
5
3.3
2.5
10
Vdc
A
W
mAPK-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
VIN = VIN, min to VIN, max;
IO =IO,Max
Output Regulation
Line: VIN = VIN, Min to VIN,
Max
Load: IO = IO, Min to IO, Max
Temperature: Ta = -40 ºC to
+85ºC
Ripple and Noise4
Peak-to-Peak: (5Hz to 20MHz)
Output Current3
External Load Capacitance
Capacitor ESR
Output Current-limit Inception
VOUT = 90% VO,SET5
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
Device
3V3 (F)
2V5 (G)
1V8 (Y)
1V2 (K)
Symbol
VO,SET
Min
3.260
2.465
1.770
1.180
Typ
3.300
2.500
1.800
1.200
Max
3.340
2.535
1.830
1.220
Unit
Vdc
Vdc
Vdc
Vdc
All
1V2 (K)
All
1V2 (K)
All
-
-
-
%Vo
-
-
-
-
-
-
±0.20
±0.30
±0.20
±0.30
±1.00
1V2
1V8/2V5
3V3
3V3
All
All
-
-
IO
0
0
4
41
52
25
35
45
-
50
75
100
40
50
25,000
52
68
mVp-p
mVp-p
mVp-p
A
3V3
All
IO
µF
mΩ
A
SHEET 4 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Over Voltage Protection Range7
Over Temperature Range6
Device
3V3 (F)
2V5 (G)
1V8 (Y)
1V2 (K)
All
Symbol
Min
3.9
3.0
2.0
1.4
110
Typ
4.1
3.2
2.4
1.6
-
Max
4.9
3.9
2.9
2.1
120
Unit
3V3 (F)
2V5 (G)
1V8 (Y)
1V2 (K)
η
η
η
η
89.5
89.0
88.0
85.5
90.5
90.0
89.0
86.5
-
%
%
%
%
All
All
2V5
-
440
490
480
540
15
520
590
ms
KHz
KHz
-
-
0.1
-
A/µs
V
°C
(AVG PCB TEMPERATURE)
Efficiency
VIN = VIN-NOM; IO = IO,MAX
TA=25°C
Turn-On Response Time
VIN = VIN-MIN to VIN-MAX
Switching Frequency
Dynamic Response:
∆IO/∆t=0.1A / uS
CO = 0uF
Load Change from IO = 50% to 75% of
IO, Max:
Peak Deviation Settling Time to VO, Nom
1V2/1V8
2V5/3V3
All
-
-
100
125
250
140
165
500
mV
Load Change from IO = 50% to 25% of
IO, Max:
Peak Deviation Settling Time to VO, Nom
Output Overshoot
at T-on / T-off
Passive Resistive Full Load
1V2/1V8
2V5/3V3
All
All
-
-
100
115
250
-
140
150
500
5
mV
Note:
µs
µs
%Vo
3. Appropriate Thermal Derating applies. See Appendix B for the Thermal Derating Curves
4. See Figure 2 for Ripple and Noise test measurement setup.
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. 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.
7. 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.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 5 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Electrical Specifications (continued)
FEATURE SPECIFICATION
Parameter
Output Enable ON/OFF10
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 Sensing11,13
Output Voltage Trim Range12,13
Note:
Device
Symbol
Min
Typ
Max
Unit
N
suffix
-
0
2.95
-
1.2
20.0
V
V
No
suffix
All
All
-
2.95
0
90
-
20.0
1.2
10
110
V
%VO
%VO
10. See Appendix A.3 for the recommended/ appropriate Module Enable configuration.
11. 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 7 (+Sense) and Pin 5
(-Sense) should be connected to Pin 8 (+Vout) and Pin 4 (Return) respectively at the point where
regulation is desired.
12. Refer to Equation (1) and (2) and Figures 3 and 4 for the Output Trim Adjust configuration.
13. The combination of remote sense and Trim adjust cannot exceed 110% of VO, NOM.
ISOLATION SPECIFICATION
Parameter
Device
Symbol
Min
Typ
Max
Unit
Isolation Capacitance
All
-
-
2.70
-
nF
Isolation Resistance
All
-
10
-
-
MΩ
SAFETY APPROVAL
The ALQ50 series have been certified through:
• UL + cUL 60950, Third Edition - Recognized (PENDING)
• EN 60950 through TUV-PS (PENDING)\
• Basic Insulation
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 6 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Electrical Specifications (continued)
TO OSCILLOSCOPE
Vi(+)
Ltest
12 uH
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100 kHz
BATTERY
33 uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(-)
Note: Measure the input reflected ripple current with a simulated source
inductance (Ltest) of 12uH. Capacitor Cs offsets possible battery/
source impedance. Measure current as shown above.
Figure 1. Input Reflected Ripple Current Measurement Setup.
COPPER STRIP
Vo(+)
1 uF
10 uF
SCOPE
RESISTIVE
LOAD
Vo(-)
Note: Use a 1µF 50V X7R ceramic capacitor and a 10µF 25V tantalum cap.
Scope measurement should be made using a BNC probe socket positioned
about 76mm (3 in.) away from the module’s output terminals. The ext.
capacitors should be placed between the BNC socket and the module’s
output terminals, with a minimum distance of 51mm (2in.) from the latter.
Figure 2. Peak to Peak Output Noise Measurement Setup.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 7 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Basic Operation and Features
INPUT UNDER VOLTAGE LOCKOUT
To prevent any instability to the converter, which may affect the end system, the ALQ50 series have been designed to turn-on
once VIN is in the voltage range of 33-35 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 3234 VDC.
OUTPUT VOLTAGE ADJUST/TRIM
The converter comes with a TRIM pin (PIN 6), which is used to adjust the output by as much as 90% to 110% of its set point.
This is achieved by connecting an external resistor as described below.
To INCREASE the output, external Radj_up resistor
should be connected between TRIM PIN (Pin6) and
+SENSE PIN (Pin 7). Please refer to Equation (1) for the
required external resistance and output adjust
relationship.
-Vin
-Vout
-Sense
Enable
Rload
Vadj
Radj_up
+Sense
3.3V/2.5V/1.8V
Equation (1a):
Radj_up
+Vin
5.1⋅ Vo( 100 + ∆%) − 510 − 10.2 ⋅ kΩ
1.225⋅ ∆%
∆%
Figure 3. External resistor configuration to increase the outputs
1.2V
Equation (1b):
Radj_up
+Vout
5.1⋅ Vo( 100 + ∆%) − 510 − 10.2 ⋅ kΩ
0.6⋅ ∆%
∆%
To DECREASE the output, external Radj_down resistor
should be connected between TRIM PIN (Pin 6) and
-SENSE PIN (Pin 5). Please refer to Equation (2) for the
required external resistance and output adjust
relationship.
-Vin
-Sense
Radj_down
Enable
Equation (2)
Radj_down
-Vout
Vadj
Rload
+Sense
510 − 10.2 ⋅ kΩ
∆%
+Vin
+Vout
Figure 4. External resistor configuration to increase the outputs
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 8 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Basic Operation and Features (continued)
OUTPUT ENABLE
The ALQ50 series comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive
(no part number suffix required) and a Negative (suffix “N” required) Enable Logic options are being offered. Please refer to
Table 2 for the Part Numbering Scheme.
For Positive Enable, the converter is turned on when the Enable pin is at logic HIGH or left open. The unit turns off when the
Enable pin is at logic LOW or directly connected to -VIN. On the other hand, the Negative Enable version turns unit on when
the Enable pin is at logic LOW or directly connected to -VIN. The unit turns off when the Enable pin is at Logic HIGH.
OUTPUT OVER VOLTAGE PROTECTION (OVP)
The Over Voltage Protection circuit comes in latching mode. The converter is latched off if the output voltage exceeds the
OVP threshold limits. The OVP latch is reset either by cycling the input voltage or toggling the Enable signal for 100ms.
OVER CURRENT PROTECTION (OCP)
The Over Current Protection circuit comes in latching mode. The converter is latched off if the load current on the output
reaches the OCP threshold limit. The OCP latch can be reset either by cycling the input voltage or toggling the Enable signal
for 100ms. Consult factory for Auto-restart option.
OVER TEMPERATURE PROTECTION (OTP)
The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature reaches the OTP
range. This feature prevents the unit from overheating and consequently going into thermal runaway, which may further
damage the converter and the end system. Such overheating may be an effect of operation outside the given power thermal
derating conditions. Restart is possible once the temperature of the sensed location drops to less than 110°C.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 9 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Performance Curves
ALQ40F48 (3.3V) SERIES
Efficiency VS. Load Current, T A=25°C
Power Dissipation vs Output Current, T A=25°C
95%
20
Power Dissipation (Watts)
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36Vdc
60%
Vin = 48Vdc
55%
Vin = 36 Vdc
16
Vin = 48 Vdc
Vin = 75 Vdc
12
8
4
Vin = 75Vdc
0
50%
0
10
20
30
Output Current (Amps)
0
40
10
20
30
Output Current (Amps)
40
Figure 5. Efficiency vs. Load Current Curves at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Figure 6. Power Dissipation vs. Load Current at TA=25°C
for different input voltages with 300LFM airflow directed
from Pins 3 to 1.
Efficiency vs Load Current, T A=85°C
Power Dissipation vs Output Current, T A=85°C
95%
Power Dissipation (Watts)
20
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36V
60%
Vin = 48V
55%
Vin = 36 Vdc
Vin = 48 Vdc
16
Vin = 75 Vdc
12
8
4
Vin = 75V
0
50%
0
10
20
30
Output Current (Amps)
40
Figure 7. Efficiency vs. Load Current Curves at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
0
10
20
30
Output Current (Amps)
40
Figure 8. Power Dissipation vs. Load Current at TA=85°C
for different input voltages with 300LFM airflow directed
from Pins 3 to 1.
SHEET 10 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Performance Curves (continued)
ALQ50G48 (2.5V) SERIES
Efficiency vs Output Current, T A= 25°C
Power Dissipation vs Output Current, T A= 25°C
95%
20
Power Dissipation (Watts)
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36Vdc
60%
Vin = 48Vdc
55%
Vin = 36 Vdc
Vin = 48 Vdc
16
Vin = 75 Vdc
12
8
4
Vin = 75Vdc
0
50%
0
10
20
30
40
Output Current (Amps)
0
50
10
20
30
40
Output Current (Amps)
50
Figure 9. Efficiency vs. Load Current Curves at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Figure 10. Power Dissipation vs. Load Current at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Efficiency vs Output Current, T A= 85°C
Dissipation vs Output Current, T A= 85°C
20
Power Dissipation (Watts)
95%
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36 Vdc
60%
Vin = 48 Vdc
55%
Vin = 36 Vdc
16
Vin = 48 Vdc
Vin = 75 Vdc
12
8
4
Vin = 75 Vdc
0
50%
0
10
20
30
40
Output Current (Amps)
50
Figure 11. Efficiency vs. Load Current Curves at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
0
10
20
30
40
50
Output Current (Amps)
Figure 12. Power Dissipation vs. Load Current at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
SHEET 11 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Performance Curves (continued)
ALQ50Y48 (1.8V) SERIES
Power Dissipation vs Output Current, T A=25°C
Efficiency VS. Load Current, T A=25°C
20
Power Dissipation (Watts)
95%
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36Vdc
60%
Vin = 48Vdc
55%
Vin = 36 Vdc
Vin = 48 Vdc
16
Vin = 75 Vdc
12
8
4
Vin = 75Vdc
0
50%
0
10
20
30
40
Output Current (Amps)
0
50
10
20
30
40
Output Current (Amps)
50
Figure 13. Efficiency vs. Load Current Curves at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Figure 14. Power Dissipation vs. Load Current at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Efficiency vs Output Current T A= 85°C
Dissipation vs Output Current, T A= 85°C
20
Power Dissipation (Watts)
95%
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36 Vdc
60%
Vin = 48 Vdc
55%
Vin = 36 Vdc
Vin = 48 Vdc
16
Vin = 75 Vdc
12
8
4
Vin = 75 Vdc
50%
0
0
10
20
30
40
50
Output Current (Amps)
Figure 15. Efficiency vs. Load Current Curves at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
0
10
20
30
Output Current (Amps)
40
50
Figure 16. Power Dissipation vs. Load Current at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
SHEET 12 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Performance Curves (continued)
ALQ50K48 (1.2V) SERIES
Efficiency vs Output Current, T A= 25°C
Power Dissipation vs Output Current, T A= 25°C
95%
20
Power Dissipation (Watts)
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36Vdc
60%
Vin = 48Vdc
55%
Vin = 36 Vdc
16
Vin = 48 Vdc
Vin = 75 Vdc
12
8
4
Vin = 75Vdc
0
50%
0
10
20
30
40
Output Current (Amps)
0
50
10
20
30
40
50
Output Current (Amps)
Figure 17. Efficiency vs. Load Current Curves at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Figure 18. Power Dissipation vs. Load Current at TA=25°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
Efficiency vs Output Current, T A= 85°C
Dissipation vs Output Current, T A= 85°C
95%
20
Power Dissipation (Watts)
90%
Efficiency
85%
80%
75%
70%
65%
Vin = 36 Vdc
60%
Vin = 48 Vdc
55%
Vin = 36 Vdc
Vin = 48 Vdc
16
Vin = 75 Vdc
12
8
4
Vin = 75 Vdc
50%
0
0
10
20
30
40
50
Output Current (Amps)
Figure 19. Efficiency vs. Load Current Curves at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
0
10
20
30
40
Output Current (Amps)
50
Figure 20. Power Dissipation vs. Load Current at TA=85°C
for different input voltages with 300 LFM airflow directed
from Pins 3 to 1.
SHEET 13 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Performance Curves (continued)
CURRENT VS. TEMPERATURE CURVES
2.5V DERATING, 48V Input
40
50
35
45
Output Current (A)
Output Current (A)
3.3V DERATING, 48V Input
30
25
20
15
0 LFM (0 m/ s)
10
100 LFM (0.5m/ s)
200 LFM (1.0 m/ s)
5
40
35
30
25
0 LFM (0 m/s)
20
100 LFM (0.5m/s)
200 LFM (1 m/s)
15
400 LFM (2.0 m/s)
400 LFM (2 m/ s)
0
10
25
35
45
55
65
75
Ambient Temperature (°C)
85
Figure 21. ALQ40F48 (3.3V) Output Derating curves at
various airflow conditions directed across PIN 3 to 1 with
the module mounted vertically.
25
50
45
45
Output Current (A)
Output Current (A)
85
1.2V DERATING, 48V Input
50
40
35
30
25
0 LFM (0 m/ s)
100 LFM (0.5m/ s)
200 LFM (1.0 m/ s)
15
45
55
65
75
Ambient Temperature (°C)
Figure 22. ALQ50G48 (2.5V) Output Derating curves at
various airflow conditions directed across PIN 3 to 1 with
the module mounted vertically.
1.8V DERATING, 48V Input
20
35
40
35
30
25
0 LFM (0 m/ s)
20
100 LFM (0.5m/ s)
200 LFM (1.0 m/ s)
15
400 LFM (2.0 m/s)
400 LFM (2.0 m/ s)
10
10
25
35
45
55
65
75
Ambient Temperature (°C)
85
Figure 23. ALQ50Y48 (1.8V) Output Derating curves at
various airflow conditions directed across PIN 3 to 1 with
the module mounted vertically.
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
25
35
45
55
65
75
Ambient Temperature (°C)
85
Figure 24. ALQ50K48 (1.2V) Output Derating curves at
various airflow conditions directed across PIN 3 to 1 with
the module mounted vertically.
SHEET 14 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Mechanical Specifications
Parameter
Dimension
Device
All
Symbol
L
W
H
Weight
Min
-
Typ
2.30 [58.42]
1.48 [37.59]
0.36 [9.10]
Max
-
Unit
in [ mm ]
in [ mm ]
in [ mm ]
-
PIN ASSIGNMENT
1
2
3
4
g [oz]
+VIN
ENABLE
-VIN
-VO
5
6
7
8
0.36
[9.1]
[58.4]
-SENSE
TRIM
+SENSE
+VO
0.20[5.0] MIN
0.24[6.0] MAX
0.06Ø[1.5Ø] 2 PLACES
1
1.48
[37.6]
8
7
6
5
4
2
3
0.04Ø [1.0Ø] 6 PLACES
SIDE VIEW
PIN SIDE DOWN
2.00
[50.8]
0.15
[3.8]
0.44
0.74 [11.2]
1.04
[18.8]
[26.4]
PIN ASSIGNMENT
0.44
0.59
[11.2]
[15.0]
C
L
0.74 0.89
[18.9] [22.7] 1.04
[26.5]
1
2
3
4
5
6
7
8
+ VIN
Enable
-VIN
-Vout
-Sense
Trim
+ Sense
+ Vout
Figure 25. ALQ50 Series Mechanical Outline Drawing
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 15 OF 16
Technical Reference Notes
ALQ40/50 Series
(Open Frame Single Output Quarter Brick)
Mechanical Specifications (continued)
SOLDERING CONSIDERATIONS
The ALQ50 series converters are compatible with standard wave soldering techniques. When wave soldering, the
converter pins should be preheated for 20-30 seconds at 110°C and wave soldered at 260°C for less than 10 seconds.
When hand soldering, the iron temperature should be maintained at 425°C and applied to the converter pins for less
than 5 seconds. Longer exposure can cause internal damage to the converter. Cleaning can be performed with cleaning
solvent IPA or with water.
PART NUMBERING SCHEME FOR ORDERING
OUTPUT
VOLTAGE
ALQ40 / 50
x
ENABLE LOGIC
48
F = 3.3V
G = 2.5V
Y = 1.8V
K = 1.2V
y
N
= Negative Enable
“Blank” = Positive Enable (Default)
Please call 1-888-41-ASTEC for further inquiries
or visit us at www.astecpower.com
MODEL: ALQ50 SERIES
APRIL 21, 2003 - REVISION A (PRELIMINARY)
SHEET 16 OF 16