Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
AEQ75Y48 Single Output: Baseplate DC-DC Converter Module
Industry Standard ¼ Brick: 36V-75V Input / 1.8V @ 75A Output Current
The AEQ75Y48 series is the latest addition to Astec’s quarter brick size offerings. At 1.8V, it delivers 75A maximum output
current at 89% Efficiency. It provides tight regulation and exhibits clean and monotonic output start up characteristics. The
new modules come with industry standard features such as Input UVLO, OCP, OVP, OTP, Output Trim, differential output
Sense pins. It also comes standard with 2 pairs of output power pins (add suffix “-3” for single pair output pin option) and
offers baseplate construction for optimum user flexibility.
Electrical Parameters
Input
Input Range
Input Surge
Efficiency
36-75 VDC
100V / 100ms
1.8V @ 89% (Typ)
Control
Enable
TTL compatible
(Positive and Negative Enable Options)
Output
Special Features
•
•
•
•
•
•
•
•
Industry Standard ¼ Brick Footprint
Redundant output power pins (with single
pair option)
Positive and Negative Enable Options
Regulation to Zero Load
High Capacitive Load Start-up
Output Trim
Input Under-Voltage Lockout
Low profile
Environmental Specifications
•
•
•
-40ºC to 105ºC Operating Temperature
-55ºC to 125ºC Storage Temperature
MTBF > 1 million hours
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
Load Current
Line/Load Regulation
Ripple and Noise
Output Voltage
Adjust Range
Transient Response
Remote Sense
Over Current
Protection
1.8V @ 75A max
< 1% VO
100mVPK-PK max
±10% VO
< 100mV deviation (Typ)
50% to 75% Load Change
100µsec settling time (Typ)
+10%VO
120% IO,MAX
Safety
UL + cUL 60950, Recognized
EN60950 through TUV-PS
SHEET 1 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Electrical Specifications
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
Input to Baseplate
Output to Baseplate
Operating Ambient Temperature
Storage Temperature
Operating Humidity
Maximum Enable Voltage
Max Output Power
Device
Symbol
Min
Typ
Max
Unit
All
All
VIN
VI N, trans
0
0
-
75
100
Vdc
Vdc
1500
-
-
Vdc
TA
TSTG
-
-40
-55
10
-
PO
-
-
105
125
85
25
135
ºC
ºC
%
Vdc
W
All
All
All
All
All
STANDARD TEST CONDITION on a single module unless otherwise specified.
TA
Airflow
+VIN
Enable
-VIN
-VOUT
-VOUT
-Sense
Trim
+Sense
+Vout
+Vout
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
PIN 9
PIN 10
25°C (Ambient Air)
400LFM
+48Vdc input supply
Dependent on model series
Return pin for +VIN
Connected to Load Return [Optional Pin]
Connected to Load Return
Connected to -VOUT
Open
Connected to +VOUT
Connected to +Load
Connected to +Load [Optional Pin]
SHEET 2 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Electrical Specifications (continued)
INPUT SPECIFICATION
Parameter
Operating Input Voltage
Min
36
36
Typ
48
48
Max
75
62
Unit
VDC
34
32
-
34.8
33.5
-
35.5
34.5
4.5
Vdc
-
3
4
W
II1
-
10
20
mAPK-PK
Device
All
Symbol
VO,SET
Min
1.770
Typ
1.800
Max
1.830
Unit
Vdc
All
-
-
0.10
0.30
%Vo
Load: IO = IO, Min to IO, Max
All
-
-
0.05
0.20
%Vo
Temperature: Ta = -40 ºC to +85ºC
All
-
-
15
50
mV
Ripple and Noise3
RMS (5Hz to 20MHz)
Peak-to-Peak: (5Hz to 20MHz)
All
-
-
25
30
100
mVRMS
mVp-p
Output Current4
All
IO
0
-
75
A
External Load Capacitance
Capacitor ESR
Output Current-limit Inception5
VOUT = 90% VO,SET
Over Voltage Protection Range5
All
-
All
IO
4
78
80
25,000
90
µF
mΩ
A
2.1
-
2.9
V
-
110
-
°C
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) @ 25 ºC
Input Reflected Ripple Current2
Conditions: PO = PO,max; TA = 25 ºC
BW: 5Hz to 20MHz
Device
All
T1
All
All
Symbol
VIN
IIN,max
All
All
A
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
Over Temperature Range6
AEQ (referenced to avg Baseplate temp)
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
All
AEQ
TBP
SHEET 3 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS
Parameter
Efficiency
VIN = VIN-NOM; TA=25°C
Turn-On Response Time
VIN = VIN-MIN to VIN-MAX
Switching Frequency
Dynamic Response:
CO = 0uF
Peak Deviation
Load Change from IO = 50% to 75% of
IO, Max:
Settling Time to VO, Nom
Peak Deviation
Load Change from IO = 50% to 25% of
IO, Max:
Settling Time to output voltage setpoint
tolerance – Vo,SET
Output Overshoot
at T-on / T-off
Note:
Device
Symbol
Min
Typ
Max
Unit
All
η
88
89
-
%
All
All
-
440
-
15
520
ms
KHz
∆IO/∆t
-
0.09
0.1
1.1
A/µs
All
Vpk
-
4
8
%Vo,SET
ts
-
100
300
µs
Vpk
-
4
8
%Vo,SET
ts
-
100
300
µs
-
-
-
4
%Vo
All
All
1. An input line fuse is recommended for use.
2. External input capacitance required. See Input Ripple Current test measurement setup on Figure 1.
3. Refer to Figure 2 for output ripple measurement setup.
4. Appropriate Thermal Derating applies. See Figure 6.
5. Over current and over voltage protections are all in auto recovery mode. The converter will shutdown
during fault condition then will attempt to auto restart.
6. Output of the module will be terminated once the operating temperature reaches the OTP threshold.
Normal operation resumes once the temperature falls below the OTP threshold.
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 4 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Electrical Specifications (continued)
FEATURE SPECIFICATION
Parameter
Output Enable ON/OFF
Negative Enable ("N" suffix)
Enable Pin voltage for Module OFF
Module ON
Positive Enable (No suffix)
Enable Pin voltage for Module ON
Module OFF
Enable Pin current
Module at ON State
Module at OFF State (Leakage)
Output Voltage Remote Sensing7, 9
Output Voltage Trim Range8, 9
Note:
Device
Symbol
Min
Typ
Max
Unit
N
suffix
-
2.95
0
-
20.0
0.8
V
V
No
suffix
-
0
2.95
-
0.8
20.0
V
V
All
-
-
-
1
50
mA
µA
All
All
-
90
-
10
110
%VO
%VO
7. 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 8 (+Sense) and Pin 6 (-Sense) should
be connected to Pin 9 (+Vout) and Pin 5 (Return) respectively at the point where regulation is desired.
8. Refer to Equation (1) and (2) and Figures 3 and 4 for the Output Trim Adjust configuration.
9. The combination of remote sense and Trim adjust cannot exceed 110% of VO, NOM.
ISOLATION SPECIFICATION
Parameter
Isolation Capacitance
Isolation Resistance
MTBF
Telcordia SR332 (Parts Stress)
TA = 40°C; IO = 30A; Airflow = 200LFM
Device
All
All
Min
10
Typ
2.70
1,029,514
Max
-
Unit
nF
MΩ
Hrs
SAFETY APPROVAL
The AEQ75Y48 series have been certified through:
• UL + cUL 60950, Third Edition - Recognized
• EN 60950 through TUV-PS
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 5 OF 12
Technical Reference Notes
AEQ75Y48 Series
(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: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 6 OF 12
Technical Reference Notes
AEQ75Y48 Series
(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 converter have been designed to turn-on once
VIN is in the voltage range of 34-35.5VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 32-34.5
VDC.
OUTPUT VOLTAGE ADJUST/TRIM
The converter comes with a TRIM pin (PIN 7), 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 (Pin7) and
+SENSE PIN (Pin 8). Please refer to Equation (1) for the
required external resistance and output adjust
relationship.
-Vin
-Vout
-Sense
Enable
Rload
Vadj
Radj_up
+Sense
Equation (1):
Radj_up
+Vin
+Vout
5.1⋅ Vo(100 + ∆%) − 510 − 10.2 ⋅ kΩ
1.225⋅ ∆%
∆%
Figure 3. External resistor configuration to increase the outputs
To DECREASE the output, external Radj_down resistor
should be connected between TRIM PIN (Pin 7) and
-SENSE PIN (Pin 6). 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: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 7 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Basic Operation and Features (continued)
OUTPUT ENABLE
The converter 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 shutdown mode. The output of the converter is terminated under an OVP fault
condition (Vo > OVP threshold). The converter will automatically recover once the fault condition is removed.
OVER CURRENT PROTECTION (OCP)
The Over Current Protection circuit comes in shutdown mode. The converter shuts down once the output current reaches the
OCP range. The converter will automatically recover once the fault condition is removed.
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: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 8 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Performance Curves
Power Dissipation vs. Output Current, T B=45°C
22
Efficiency vs. Output Current, T B = 45°C
95%
20
90%
Power Dissipation [W]
18
Efficiecny [%]
85%
80%
75%
70%
65%
Vin = 36Vdc
14
12
10
8
Vin = 36Vdc
6
Vin = 48Vdc
4
Vin = 48Vdc
60%
16
Vin = 75Vdc
2
Vin = 75Vdc
0
55%
0
20
40
Output Current [A]
0
60
Figure 5. Efficiency vs. Load Current at Baseplate
Temperature, TB = 45ºC.
15
30
45
Output Current [A]
60
75
Figure 6. Power Dissipation vs. Load Current at Baseplate
Temperature, TB = 45ºC.
Output Current vs. Temperature
75
Current [A]
60
45
30
0 LFM (0 m/s)
100 LFM (0.5 m/s)
15
200 LFM (1m/s)
400 LFM (3 m/s)
0
25
35
45
55
65
Ambient Temperature [°C]
75
Figure 7. Output Power Derating Curves at VIN = 48Vdc.
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
85
Figure 8. Output Ripple Waveform at VIN = 48Vdc,
TA = 25ºC, IO = 75A.
SHEET 9 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Performance Curves (continued)
Performance Curves (continued)
Figure 9. Output Transient Response (50% to 75% Step
Change) at VIN = 48Vdc, TA = 25ºC.
Figure 10. Output Transient Response (25% to 50% Step
Change) at VIN = 48Vdc, TA = 25ºC.
Figure 11. Enable Turn On Characteristic at VIN = 48Vdc,
TA = 25ºC.
Figure 12. Output Startup Waveform at VIN = 48Vdc,
TA = 25ºC, IO = 75A.
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 10 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Mechanical Specifications
Parameter
Dimension
Device
All
Weight
Symbol
L
W
H
AEQ
PIN ASSIGNMENT
1
2
3
4
5
Min
-
Typ
2.30 [58.42]
1.48 [37.59]
0.44 [9.10]
Max
-
Unit
in [ mm ]
in [ mm ]
in [ mm ]
-
54 [1.90]
-
g [oz]
+VIN
ENABLE
-VIN
-VO [Optional]
-VO
6
7
8
9
10
-SENSE
TRIM
+SENSE
+VO
+VO [Optional]
MOUNTING HOLE (2X)
M3 X 0.5 THROUGH
MAXIMUM SCREW TOURQUE 3.9 LBS(0.44 N-m)
2.30
[58.4]
1.86
[47.3]
1.03
[26.1]
1.45
[36.8]
0.21
[5.3]
PIN SIDE DOWN
SIDE VIEW
0.44
[11.2]
0.22
[5.6]
0.20 (TYP)
[5.1]
0.15
[3.8]
0.43
[10.9]
0.15
[3.8]
0.30
[7.6]
2.00
[50.8]
1.88
[47.7]
0.43
[10.9]
0.30
[7.6]
4
3
0.60
[15.2]
2
10
1
PIN SIDE UP
Ø 0.040 (1.02) DIA PINS (6 PLCS)
5
6
7
8
9
0.45
[11.4]
0.60
[15.2]
Ø 0.060 (1.52) DIA PINS (4 PLCS)
Figure 13. AEQ75Y48 (Baseplate) Mechanical Outline Drawing
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 11 OF 12
Technical Reference Notes
AEQ75Y48 Series
(Single Output Quarter Brick)
Mechanical Specifications
SOLDERING CONSIDERATIONS
The AEQ75Y48 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
Part Number
AEQ75Y48
AEQ75Y48-3
AEQ75Y48N
AEQ75Y48N-3
AEQ75Y48N-TI1
Construction
Baseplate
Baseplate
Baseplate
Baseplate
Baseplate
Vout / Iout / Enable Logic
1.8V / 75A; Positive Enable
1.8V / 75A; Positive Enable
1.8V / 75A; Negative Enable
1.8V / 75A; Negative Enable
1.8V / 75A; Negative Enable
Pin Length
5.0 mm
5.0 mm
5.0 mm
5.0 mm
3.7 mm
Pin Out Option
Pins 4 & 10: Present
Pins 4 & 10: Omitted
Pins 4 & 10: Present
Pins 4 & 10: Omitted
Pins 4 & 10: Present
Note: 1 – Tuned version for specific customer application.
Please call 1-888-41-ASTEC for further inquiries
or visit us at www.astecpower.com
MODEL: AEQ75Y48 SERIES
JULY 21, 2005 - REVISION 01
SHEET 12 OF 12