Aries Series, Page 1
Part No. 99001 Rev. 2.2
WWW.GALAXYPWR.COM
The Aries Series are very high efficiency
non-isolated DC/DC Converters with:
Horizontal or Vertical Mount
Very High Efficiency
2.5V or 3.3V Output @ up to 24A
Fixed Frequency Operation
Trimmable Over Voltage Protection
Output Voltage Trim
Two Year Warranty
ARIES Series
5V Input, 3.3VDC, 24A Output,
3.25V Input, 2.5VDC, 24V Output
Control Functions
Remote Sense
Output Enable
Protection Features
Over Temperature Protection
Over Voltage Protection
Over Current Protection
Typical Characteristics
Output Setpoint Accuracy:
1%
Load & Line Regulation:
0.5%
Noise & Ripple: 90mVp-p
Total Regulation:
5%
Output Trim
Aries Series, Page 2
Part No. 99001 Rev. 2.2
WWW.GALAXYPWR.COM
General Specifications
Operating Air Temperature from 0
C to +45C with 500 LFM.
3.3V Output Unit
Input Characteristics
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Operating Input Range
V
I
I
O
= 24A
4.5
--
5.5
V
No Load Input Power
P
IL
V
I
= V
Inom
--
--
2
W
Input Current
I
I
V
I
= 5V, I
O
= 24A, V
O
= 3.3V
--
--
20
A
Efficiency
N
V
I
= 5V, I
O
= 24A, V
O
= 3.3V
88
--
--
%
Reflected Input Ripple (Note 1)
dI
I
V
I
= 5V, I
O
= 24A
--
--
5.2
A
PP
Switching Frequency
F
S
--
250
--
kHz
Output Characteristics
(Over the complete baseplate temperature and input voltage ranges.)
Output Voltage Set Point
V
O
V
I
= 5V, I
O
= 12 A
3.267
3.300
3.333
V
Rated Output Current
I
O
V
O
= V
O
nom (externally)
--
24
--
A
Load & Line Regulation
V
I
= 4.55.5V, I
O
= 0-24A
--
--
15
mV
Noise and Ripple
V
I
=5.0V, I
O
= 24A
--
60
90
mV
PP
Load Range
0
--
24
A
Total Regulation
V
I
= 4.55.5V, I
O
= 0-24A
3.135
3.300
3.465
V
(Load, Line, Temp, Drift)
Remote Sense Compensation
V
I
= 4.55.5V, I
O
= 24A
--
--
100
mV
(Round Trip)
Output Overvoltage Protection (Nom)
V
I
= 5V, I
O
= 12A, V
O
= 3.3V
3.8
--
4.2
V
See Note 3, Latching
Output Voltage Protection
t
OVP
V
I
= 5V, I
O
= 12A, V
O
= 3.3V
--
--
150
s
Response Time
Current Limit (Nom)
I
L
V
I
= 5V, V
O
= 3.3V
25
--
30
A
Short Circuit Output
V
SC
V
I
= 5V, I
O
= 42A
--
--
0.6
V
O
Voltage Compliance
Load Transient Response,
V
OPK
I
O
= 9-14A@0.05A/
s(di/dt),
--
--
80
mV
V
O
Deviation from Steady State
pos or neg step
Settling Time
V
O
= 3.3V
--
--
1200
s
Turn on Time
t
ON
V
I
= 4.55.5V, I
O
= 0-24A
--
--
10
ms
per figures 3, 4, & 5
External Load Capacitance (Note 2)
1000
--
9900
f
Notes: 1. Input filter capacitor Cin= 1000
F (330F, ESR 60m, 3 capacitors in parallel) Provide 3" loop between positive
terminal of Cin and Vin of the converter to measure reflected input ripple current.
2. The converter output voltage shall be stable when (30) 330
F (9900F total) tantalum (ESR 60m) capacitors are
connected across the output of the converter.
3. Adjustment pins J2-18 & 19 are normally left open; see Output Voltage Setting Table on page 5 if using OVP and
output voltage trim adjustment.
General Specifications
Operating Temperature
0
C to +45C Ambient Air Temp.
Storage Temperature
40
C to +100C
Relative Humidity
10% to 95% RH, Non-condensing
Vibration
10500Hz, 0.75g peak
Material Flammability
UL94V-0
Weight
100 grams typ. with heatsink
MTBF MIL-HDBK-217E
1,200,000 hours*
*Note: 50% load; 45
C ambient, 500LFM; calculated MTBF
Aries Series, Page 3
Part No. 99001 Rev. 2.2
WWW.GALAXYPWR.COM
General Specifications
Operating Air Temperature from 0
C to +45C with 200 LFM.
2.5V Output Unit
Input Characteristics
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Operating Input Range (See note 1)
V
I
I
O
= 24A
3.2
--
5.5
V
No Load Input Power
P
IL
V
I
= V
Inom
--
--
2
W
Input Current
I
I
V
I
= 3.43V, I
O
= 24A, V
O
= 2.5V
--
--
21.5
A
I
I
V
I
= 5V, I
O
= 24A, V
O
= 2.5V
--
--
15
A
Efficiency
N
V
I
= 3.43V, I
O
= 24A, V
O
= 2.5V
86
--
--
%
N
V
I
= 5V, I
O
= 24A, V
O
= 2.5V
83.5
--
--
%
Reflected Input Ripple
dI
I
V
I
= 3.43V, I
O
= 24A
--
--
3.0
A
PP
(See note 2)
dI
I
V
I
= 5V, I
O
= 24A
--
--
5.2
A
PP
Searching Frequency
F
S
--
250
--
kHz
Output Characteristics
Output Voltage Set Point
V
O
V
I
= 5V, I
O
= 12A
2.470
2.495
2.520
V
Rated Output Current
I
O
V
O
= V
O
nom (externally)
--
24
--
A
Load & Line Regulation
V
I
= 3.25.5V, I
O
= 0-24A
--
--
15
mV
Noise and Ripple
V
I
=5.0V, I
O
= 24A
--
60
90
mV
PP
Load Range
0
--
24
A
Total Regulation
V
I
= 3.25.5V, I
O
= 0-24A
2.370
2.495
2.620
V
(Load, Line, Temp, Drift)
Remote Sense Compensation
V
I
= 3.25.5V, I
O
= 24A
--
--
100
mV
(Round Trip)
Output Overvoltage Protection (Nom)
V
I
=3.43V, I
O
= 12A, V
O
= 2.5V
2.76
--
2.94
V
See note 4, Latching
Output Voltage Protection
t
OVP
V
I
= 3.43V, I
O
= 12A, V
O
= 2.5V
--
--
150
s
Response Time
Current Limit
I
L
V
I
= 5V, V
O
= 2.5V
25
--
30
A
Short Circuit Output
V
SC
V
I
= 5V, I
O
= 42A
--
--
0.6
V
O
Voltage Compliance
Load Transient Response,
V
OPK
I
O
= 9-14A@0.05A/
s(di/dt),
--
--
60
mV
V
O
Deviation from Steady State
pos or neg step
Settling Time
V
O
= 2.5V
--
--
1200
s
Turn on Time
t
ON
V
I
= 3.195.5V, I
O
= 0-24A
--
--
10
ms
per figures 3, 4, & 5
External Load Capacitance (note 3)
150
--
9,900
f
Notes: 1. Connector J1 pins 1, 2, 3, and 5 are all connected together. Connector J1 pin 4 is always connected to 3.3V rail.
2. Input filter capacitor Cin= 1000
F (330F, ESR = 60m, 3 capacitors in parallel) Provide 3" loop between positive
terminal of Cin and Vin of the converter, to measure reflected input ripple current.
3. The converter output voltage shall be stable when (30) 330
f (9900F total) tantalum (ESR 60m) capacitors are
connected across the output of the converter.
4. Adjustment pins J2-18 & 19 are normally left open; see Table IV if using OVP and output voltage trim adjustment.
Aries Series, Page 4
Part No. 99001 Rev. 2.2
WWW.GALAXYPWR.COM
General Specifications
Output Voltage Setting & Typical Output Voltage DC_OK_H Threshold -- 3.3V Output Unit
Trimmed Vout
V
OVP
Trip
R1
R2
Output Voltage
-1.2%
Typ
+1.2%
-1.2%
Typ
+1.2%
TRIM
OVP
DC_OK_H
Vo
Threshold
2.662
2.694
2.727
3.642
3.687
3.731
2.26K
10.6K
2.809
6%
2.919
2.954
2.989
3.660
3.705
3.749
4.32K
11.4K
2.823
6%
3.031
3.068
3.105
3.723
3.768
3.814
6.65K
15.4K
2.871
6%
3.154
3.192
3.231
3.819
3.865
3.912
14.7K
31.6K
2.945
6%
3.264
3.303
3.343
3.915
3.962
4.010
OPEN
OPEN
3.019
6%
Notes: 1. R1 and R2 are external to the converter and shall be 0.1% tolerance.
2. Connect R1 from connector J2 pin 18 to J2 pin 16 to adjust output.
Connect R2 from connector J2 pin 19 to J2 pin 16 to adjust OVP level.
3. Output Voltage Setting tolerance
1.2% at V1 = 5.0V & IO= 12A
Output Voltage Setting & Typical Output Voltage DC_OK_H Threshold -- 2.5V Output Unit
Output
V
OVP
Trip
R1
R2
Output Voltage
Voltage
Min
Typ
Max
DC_OK_H
Threshold
2.000
2.40
2.50
2.60
2.26K
10.6K
1.755
6%
2.200
2.46
2.52
2.64
4.32K
11.4K
1.775
6%
2.300
2.56
2.60
2.74
6.65K
15.4K
1.800
6%
2.400
2.66
2.70
2.84
14.7K
31.6K
1.895
6%
2.500
2.76
2.80
2.94
OPEN
OPEN
1.965
6%
Notes: 1. R1 and R2 are external to the converter and shall be 0.1% tolerance.
2. Connect R1 from connector J2 pin 18 to J2 pin 16 to adjust output.
Connect R2 from connector J2 pin 19 to J2 pin 1 to adjust OVP level.
3. Output Voltage Setting tolerance
1.0% at V1 = 3.43V & IO= 12A
Aries Series, Page 5
Part No. 99001 Rev. 2.2
WWW.GALAXYPWR.COM
2N7000
or
Equivalent
ON >5V
OFF
0.6V
ON/OFF
To ()
To V
ENABLE
Pin
Enable
5V
0.8V
Regulation Band
Time
V
OUT
90%
10%
T
ON
Time
TURN ON TIME FROM
V
ENABLE
GOING LOW
Application Notes
Control Signal Characteristics
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Enable_L
V
I
= 5V, I
O
= 24A
Enable_L Source Current
--
--
1.0
mA
Enable_L Voltage Low
--
--
0.8
V
Enable_L Voltage High
2.6
--
--
V
Enable_L Low (Turn On Delay)
--
--
10
ms
Enable_L Low (Output Voltage)
2.458
2.495
2.532
V
Bias Current (12 Volt)
I
bias
V
I
= 5V, I
O
= 24A
--
70
100
mA
DC_OK_H High
V
I
= 3.43V, I
O
= 24A, V
O
=
2.1V
3.3
--
--
V
DC_OK_H Low
V
I
= 3.43V, I
O
= 24A, V
O
=
1.8V
--
--
0.8
V
Fault_H High (OVP latched)
V
I
= 3.43V, I
O
= 24A
3.3
--
5
V
Fault_H Low
--
--
0.8
V
Fault_H Source Current
(OVP latched)
10
--
--
mA
Note: FaultH occurs when the output voltage level is over the OVP threshold, pass transistor in the converter is shorted when
input voltage is applied, or when a difference between input to output voltage exceeds 2.4 volts with the input voltage only at 3.3V
nominal and not at 5V nominal.
Enable L: This input signal is used to enable the output
of the converter when activated (active Low). The
signal is referenced to output side (-Sense) or GND.
Enable Circuit Turn-On Time
Turn-On Time
Output Load Conditions
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