Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
AEQ15AF48 - 5V/3.3V Dual Output DC-DC Converter Module
Industry Standard ¼ Brick w/ Baseplate: 36V-75V Input; 60W Output Power
The AEQ15 series is among Astec's dual output; high-density converter offering that comes in an industry standard ¼ brick
baseplate package. The AEQ15 series has been designed to deliver 60W of clean, well-regulated DC power for today's
demanding loads at high efficiency levels (89% typical for 30W/30W power split between rails). The 5V rail is capable of
delivering 12A max and the 3.3V rail is capable of delivering 15A max for a maximum output power of 60W. The module
comes with industry standard feature sets such as output enable with positive or negative logic options; input UVLO, output
trim, over current, over voltage and over temperature protection.
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
89% (typ. at balanced load)
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
Load Current
Special Features
Regulation (Typ)
•
Ripple and Noise
•
•
•
•
•
•
•
Industry Standard ¼ Brick Footprint with
Baseplate
High Efficiency @ 89% (60W full load)
Positive and Negative Logic Enable Options
High Capacitive Load Start-up
Fixed Switching Frequency for EMI
predictability
Output Trim
Input Under-Voltage Lockout
Basic insulation
Output Voltage
Adjust Range
Transient Response
Over Current
Protection
5V @ 12A max
3.3V @ 15A max
60W Total Output Power
± 4% VO (5V)
± 3% VO (3V3)
80mVPK-PK max (5V output)
60mVPK-PK max (3.3V output)
±10% VO,NOM
2% VO deviation (Typ)
50% to 75% Load Change
< 100µsec settling time (Typ)
120% IO,MAX
Switching Frequency 360kHz
Environmental Specifications
Safety
•
•
•
UL 1950, 3rd Edition
CSA C22.2 No 950-95
EN60950 through TUV-PS
-40ºC to 100ºC Base plate Temperature
-40ºC to 125ºC Storage Temperature
MTBF > 1 million hours
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
SHEET 1 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
AEQ15 Series
THIS SPECIFICATION COVERS THE REQUIREMENTS FOR A NEW ¼-BRICK SIZE
12A-15A/ DUAL CHANNEL HIGH EFFICIENCY DC/DC CONVERTER.
MODEL NAME
AEQ15AF48
AEQ15AF48-6
AEQ15AF48N
AEQ15AF48N-6
CONSTRUCTION
Baseplate; 5mm pin length
Baseplate; 3.7mm pin length
Baseplate; 5mm pin length
Baseplate; 3.7mm pin length
OPTIONS:
Negative Enable:
Positive Enable:
5mm (default) pin length:
3.7mm pin length:
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
VOUT / IOUT
5V / 12A; 3.3V / 15A
5V / 12A; 3.3V / 15A
5V / 12A; 3.3V / 15A
5V / 12A; 3.3V / 15A
SUFFIX
"N"
No suffix
No Suffix
“-6”
SHEET 2 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Electrical Specifications
STANDARD TEST CONDITION on a single module unless otherwise specified.
Ta
+VIN
Enable
-VIN
+VOUT 2
O/P Return
Trim
+Vout 1
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
25°C (Ambient Air)
48Vdc
Dependent on model series
Input return
Load 2
Secondary Return
Open
Load 1
ABSOLUTE MAXIMUM RATINGS
Stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. Functional
operation of the 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
Input to Case
Output to Case
Operating baseplate temperature
Storage Temperature
Operating Humidity
Max Output Power
Note:
Device
Symbol
Min
Typ
Max
Unit
All
All
VIN
VI N, trans
0
0
-
75
100
Vdc
Vdc
TA
TSTG
PO
-40
-55
-
-
1500
500
500
+100
+125
85
60
Vdc
Vdc
Vdc
ºC
ºC
%
W
All
All
All
All
All
1. An input line fuse is recommended (Littelfuse type 312003, rated 3A, 250V or equivalent).
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
SHEET 3 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
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
No Load Input Power
VIN = 48Vdc
Input Reflected Ripple Current2
Conditions: PO = PO,max; TA = 25 ºC
BW: 5Hz to 20MHz
Note:
Device
All
All
All
Symbol
VIN
Min
36
Typ
48
Max
75
Unit
VDC
IIN,max
30
-
34.5
32.5
-
35
2.25
Vdc
Vdc
A
-
-
3.5
W
-
-
260
mAPK-PK
All
All
II1/ II2
2. External input capacitance required. See Input Reflected Ripple Current test measurement setup on Fig 1.
OUTPUT SPECIFICATIONS
Parameter
Output Voltage Set point
VIN = VIN, min to VIN, max;
IO =IO1 + IO2 = 6A + 9A; TA = 25°C
Output Current
Output Regulation
Line: VIN = VIN, Min to VIN, max
IO1 = 6A; IO2 = 9A
Load: (1. VIN = 48Vdc; IO2 = IO,min:
IO1 = IO,min to IO,max.
2.VIN = 48Vdc; IO1 = 3.5A;
IO2 = 1-13A) TA =25°C @
300LFM
Ripple and Noise3
Peak-to-Peak: (5Hz to 20MHz)
External Load Capacitance
Output Current-limit Inception4
VOUT = 90% VO,SET
Output Short Circuit Current5
Efficiency
Conditions: IO=IO1+IO2=6A+9A;
VIN = 48Vdc; TA = 25°C
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
Device
All
Symbol
VO,SET1
VO,SET2
Min
4.93
3.25
Typ
5.00
3.30
Max
5.08
3.35
Unit
Vdc
All
IO1
IO2
1
1
-
12
15
A
A
All
VO1
VO2
4.80
3.20
-
5.20
3.40
Vdc
Vdc
VO1
VO2
4.80
3.20
-
5.20
3.40
Vdc
Vdc
VO1
VO2
IO1
IO2
All
13
18
-
-
80
60
10,000
18
24
150
mVPK-PK
mVPK-PK
µF
A
A
IO,max
All
89
90
-
%
All
All
All
SHEET 4 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Switching Frequency
Dynamic Response5
Device
All
All
Symbol
∆IO/∆t
Min
310
-
Typ
360
-
Max
400
1
Load Change from: IO = 50% to 75% of
IO, Max
Peak Deviation Settling Time to VO, Nom
-
2
6
-
250
500
Load Change from: IO = 50% to 25% of
IO, Max
Peak Deviation Settling Time to VO, Nom
Turn on time5
Condition: IO=IO,max; VO within 1%; the
other channel @ min load
Output Overshoot5
Condition: IO=IO,max; the other channel
@ min load
-
2
6
-
250
1
500
5
µs
ms
All
Unit
KHz
A/10µs
%Vo
µs
%Vo
All
-
-
-
5
%Vo
Device
Symbol
Min
Typ
Max
Unit
-
0
1.8
-
2.5
5.0
V
V
-
1.8
0
-
5.0
2.5
V
VO1
VO2
5.7
3.8
115
1.0
50.0
6.5
4.3
mA
µA
V
V
ºC
110
%VO
FEATURE SPECIFICATION
Parameter
Output Enable ON/OFF
Negative Enable ("N" suffix)
Enable Pin voltage for Module ON
Module OFF
Positive Enable (No “N”suffix)
Enable Pin voltage for Module ON
Module OFF
Enable Pin Current
Logic Low
Logic High (ILKG @ Enable = 5V)
Output Over Voltage Clamp
(Auto Recovery; Hiccup Mode)
Over Temperature trip point (baseplate
temperature)
Output Voltage Trim Range6
Note:
N
suffix
No
suffix
All
All
All
All
90
3. VIN = 48Vdc; IO = IO,max; the other channel at min load. See Figure 2 for Ripple test measurement setup.
4. Hiccup Mode; the other channel at min load.
5. The other channel at min load.
6. See appropriate Trim Equation and configuration on Figures 3 and 4.
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
SHEET 5 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Electrical Specifications (continued)
ISOLATION SPECIFICATION
Parameter
Isolation Capacitance
Isolation Resistance
Device
All
All
Symbol
-
Min
10
Typ
680
-
Max
-
Unit
pF
MΩ
SAFETY APPROVAL
The AEQ15AF48 series have been certified through:
• UL 1950
• CSA22.2 No 950-95
• EN 60950 through TUV-PS
• Basic Insulation
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
SHEET 6 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
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: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
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Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Basic Operation and Features
INPUT UNDER VOLTAGE LOCKOUT
To prevent any instability to the converter, which may affect the end system, the AEQ15 series have been designed to turn-on
once VIN is in the voltage range of 34.5-36 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to
30 – 32.5 VDC.
OUTPUT VOLTAGE ADJUST/TRIM
The converter comes with a TRIM pin (PIN 6), which is used to adjust both outputs simultaneously 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 voltages, external Radj_up resistor should be connected between TRIM PIN (Pin6) and +Vo2 (Pin 4).
Please refer to Equation (1) for the VO,adj and Radj_up relationship.
Equation (1)
where: %VO,adj = percent change in o/p voltage
Figure 3. External Trim resistor setup to increase o/p.
To DECREASE the output voltages, external Radj_down resistor should be connected between TRIM PIN (Pin 6) and O/P Return
(Pin 5). Please refer to Equation (2) for the VO,adj and Radj_down relationship.
Equation (2)
Figure 4. External Trim resistor setup to decrease o/p.
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
SHEET 8 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Basic Operation and Features (continued)
OUTPUT ENABLE
The AEQ15 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 Negative (suffix “N” required) Enable Logic option is being offered (see Part Numbering Scheme
in Table 1).
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 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 will shut down the entire converter if any of the two output voltages exceeds the OVP
threshold limits. The converter will automatically recover once the fault is removed.
OUTPUT OVER CURRENT PROTECTION (OCP)
The Over Current Protection circuit will shutdown the converter if any of the load current of either output reaches the OCP
threshold limits. The unit will automatically recover by going into a hiccup mode until the cause of the over current condition
is removed. Note that in Figures 5 and 6, Channel 1 is 3.3V and Channel 2 is 5V.
Figure 5. IO2 (5V) = OCP, IO1 (3V3) = 1A.
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
Figure 6. IO2 (5V) = 1A, IO1 (3V3) = OCP.
SHEET 9 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Basic Operation and Features (continued)
OVER TEMPERATURE PROTECTION (OTP)
The Over Temperature Protection circuit will shutdown the converter once the sensed location 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 baseplate temperature drops to less than 105°C.
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JUNE 16, 2003 - REVISION 01
SHEET 10 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Performance Curves
EFFICIENCY
Efficiency vs. 3.3V Load Current
95%
90%
90%
85%
85%
Efficiency [%]
Efficiency [%]
Efficiency vs. 5V Load Current
95%
80%
75%
70%
36Vin
65%
80%
75%
70%
36Vin
65%
48Vin
48Vin
60%
55%
10%
75Vin
25%
40%
55%
70%
85%
100%
5V Load [%IO1,MAX]
Figure 7. Efficiency Curve vs. 5V Load Current (3.3V
load fixed at 1A; TBASEPLATE = 45ºC.
60%
55%
10%
75Vin
25%
40%
55%
70%
85%
100%
3.3V Load [%IO2,MAX]
Figure 8. Efficiency Curve vs. 3.3V Load Current (5V
load fixed at 1A; TBASEPLATE = 45ºC.
STARTUP CHARACTERISTIC
Figure 9. Output startup characteristic at 48VIN (CH1),
3.3V at 1A load (CH2), 5V at 1A load (CH3).
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
Figure 10. Output startup characteristic when enable pin
is activated (CH1), 3.3V at 1A load (CH2), 5V at 1A
load (CH3).
SHEET 11 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Performance Curves (continued)
CURRENT VS. TEMPERATURE CURVES
O/P Current vs. Temperature (3V3@1A fixed)
O/P Current vs. Temperature (5V@1A fixed)
16
14
14
3.3V Load Current, A
5V Load Current, A
12
10
8
6
0 LFM
100 LFM
200 LFM
300 LFM
400 LFM
4
2
12
10
8
6
0 LFM
100 LFM
200 LFM
300 LFM
400 LFM
4
2
0
0
25
40
55
70
Baseplate Temp. ºC
85
100
Figure 11. 5V output current vs. Baseplate temperature
curves when 3.3V load = 1A (min load), VIN = 48V.
25
40
55
70
Baseplate Temp. ºC
85
100
Figure 12. 3.3V output current vs. Baseplate temperature
curves when 5V load = 1A (min load), VIN = 48V.
O/P Current vs. Temperature (5V@6A fixed)
3.3V Load Current, A
10
8
6
4
0 LFM
100 LFM
200 LFM
300 LFM
400 LFM
2
0
25
40
55
70
Baseplate Temp. ºC
85
100
Figure 13. 3.3V output current vs. Baseplate temperature
curves when 5V load = 6A, VIN = 48V.
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JUNE 16, 2003 - REVISION 01
SHEET 12 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Performance Curves (continued)
OUTPUT RIPPLE
Figure 14. Output ripple at VIN = 48V, 5V (CH2) at 1A
load, 3.3V (CH1) at 1A load.
Figure 15. Output Ripple at VIN = 48V, 5V (CH2) at 1A
load, 3.3V (CH1) at 15A load.
Figure 16. Output Ripple at VIN = 48V, 5V (CH2) at 12A
load, 3.3V (CH1) at 1A load.
Figure 17. Output Ripple at VIN = 48V, 5V (CH2) at 6A
load, 3.3V (CH1) at 9A load.
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SHEET 13 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Mechanical Specifications
Parameter
Dimension
Weight
PIN ASSIGNMENT
1
2
3
4
Device
All
Symbol
L
W
H
+VIN
Enable
-VIN
+VOUT2
Min
-
Typ
2.30 [58.42]
1.50 [38.10]
0.50 [12.70]
5
6
7
Max
60 [2.1]
Unit
in [ mm ]
in [ mm ]
in [ mm ]
g [oz]
O/P RTN
TRIM
+VOUT1
NOTE: Pin diameters are 0.04” (1.02mm) in all positions
Figure 18. AEQ15 Series Mechanical Outline Drawing
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JUNE 16, 2003 - REVISION 01
SHEET 14 OF 15
Technical Reference Notes
AEQ15AF48 Series
(Dual Output Quarter Brick - Baseplate)
Mechanical Specifications (continued)
SOLDERING CONSIDERATIONS
The AEQ15AF48 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.
AEQ15
OUTPUT
VOLTAGE 1
OUTPUT
VOLTAGE 2
w
x
A = 5.0V
F = 3.3V
ENABLE LOGIC
48
PIN LENGTH OPTION
y
z
N = Negative
“Blank” = 5mm (Standard)
“Blank” = Positive
“-6” = 3.7mm
Table 2 PART NUMBERING SCHEME FOR ORDERING
Please call 1-888-41-ASTEC for further inquiries or
visit us at www.astecpower.com
MODEL: AEQ15AF48 SERIES
JUNE 16, 2003 - REVISION 01
SHEET 15 OF 15