Eighth-brick
48V Input, 2.0VDC, 40A Output
Mars
Quarter-brick
The Mars CoolConverter™ is the most
cost-effective 100W quarter-brick on
the market.
Industry Standard Pinout and Footprint
No Heat Sink Required
Very Low Common-mode Noise for a
Commercial DC/DC Converter
Two-stage Input Filter
Constant Switching Frequency
Remote Sense
Single Board Design
Very Low Parts Count
Optional Baseplate or Low Profile Heatsink
for Improved Thermal Performance
Header with M3 Metal Inserts for Mechanical
Connection to PCB
Two Year Warranty
Half-brick
The Mars Series of quarter-
brick DC/DC converters offers
high current performance with
high efficiency at low cost.
GAMW2V040 Features:
48V Input
2.0VDC, 40A Output
High Efficiency:
87% at 2.0V, 40A
89% at 2.0V, 20A
3-Quarter-brick
Control Functions
Uses Patented Power Supply Control
and Architecture
Microprocessor Controlled
Primary-side Enable, Choice of Logic
SIP
Protection Features
Over Temperature Protection
Over Voltage Protection
Over Current Protection
Over/Under Input Voltage Protection
Typical Characteristics
Output Setpoint Accuracy:
±
1%
Load Regulation:
±
0.2%
Line Regulation:
±
0.2%
Regulation over Line, Load, and
Temperature:
±
2%
Low Output Ripple
Output Trim
ISO 9001 CERTIFIED ORGANISATION
®
Certified to ISO 9001:2000
Part No. 02-GAM-04 Rev. 1.0 – 042805
WWW.GALAXYPWR.COM
Telephone: 508-870-9775
Fax: 508-870-9796
GAMW2V040 – 1
Galaxy Power Inc.
155 Flanders Road
Westborough, MA 01581
e-mail: info@galaxypwr.com
General Specifications
V
IN
= 48V
DC
, T
A
@25° C, 300 LFM Airflow, V
OUT
=2.0V
DC
, I
OUT
= Full Load unless otherwise noted.
Available output power depends on ambient temperature and good thermal management. (See application graphs for limits.)
Input Characteristics
Parameter
Min
Typ
Max
Units
Operating Input Voltage
Input Current
Input Capacitance
Input Hysteresis, Low Line
36
48
3
2
75
2.9
V
DC
A
µF
V
DC
Output Characteristics
Regulation Over Line, Load & Temperature
Voltage Ripple
Voltage Ripple, 20MHz BW
Current Range
Current Limit Inception
Short Circuit Current, Peak
1
Output Transient Response, 50% to 75% load change, 1A/µsec
2
Settling Time to
±
1%
Turn-on Time to 98%Vnom
Output Overshoot at Turn-on
Trim Range
Overvoltage Protection, Latching
70
130
2250
10
110
250
0
110
0
41.2
1.960
2.040
20
60
40
56
60
18
300
25
V
mV
RMS
mV
P–P
A
%I
o MAX
A
%V
OUT
µS
mS
%V
OUT
%V
OUT
%V
OUT
V
DC
MΩ
°
C
kHz
Isolation
Isolation Test Voltage, Input/Output (Basic)
Isolation Resistance
Features
Overtemperature Protection, Thermal Sensor, Latching3
Switching Frequency, Fixed
Notes:
1. During short circuit, converter will shut down and attempt to restart once per second. The average current during this condition will be very low
and the device can be safely left in this condition continuously.
2. Limited by output energy storage. For improved performance see Tuned (T) model information.
3. PCB less than 130° C
General Specifications
Operating Temperature
Storage Temperature
Relative Humidity
Vibration
Material Flammability
Weight
MTBF
Telcordia (Bellcore)
–40° C to +100° C
–55° C to +125° C
10% to 95% RH,
Non-condensing
2 to 9Hz, 3mm disp.,
9 to 200Hz, 1g
UL V-0
35 grams
TBD
Approvals and Standards
UL and c-UL Recognized Component, TUV**,
UL60950, CSA 22.2 No. 950, IEC/EN 60950
EMC Characteristics:
Designed to meet emission and immunity
requirements per EN55022, CISPR 22, Class B,
and CISPR 24.
** An external fuse shall be used to comply with the requirements.
GAMW2V040 – 2
WWW.GALAXYPWR.COM
155 Flanders Road
Westborough, MA 01581
Telephone: 508-870-9775
Part No. 02-GAM-04 Rev. 1.0 – 042805
Galaxy Power Inc.
Fax: 508-870-9796
e-mail: info@galaxypwr.com
Application Notes
C
ool
C
onverter
™
Galaxy’s proprietary CoolConverter™ provides:
• Patented single-stage power conversion architecture,
control, and magnetic design allow unprecedented power
density and efficiency in an isolated power supply.
• An advanced microcontroller reduces parts count while
adding features, performance, and flexibility in the design.
• Low common-mode noise as a result of lower capacitance
in the transformer from balanced winding design.
Protection and Control
Valid Input Voltage Range:
The converter measures the input voltage and will
not allow operation outside of the input voltage
specification. As shown by the graphs, hysteresis is
added to both the high and low voltage to prevent
the converter from turning on and off repeatedly
when the voltage is held near either voltage extreme.
At low line this assures the maximum input current is
not exceeded; at high line this assures the semicon-
ductor devices in the converter are not damaged by
excessive voltage stress.
ON/OFF Logic Option:
The ON/OFF control logic can be either Negative
(standard) or Positive to enable the converter. For
Negative logic the ON/OFF pin is brought to below
1.0V with respect to the –INPUT pin to enable the
converter. The pull down must be able to sink
100µA. For Positive logic the ON/OFF pin is brought
to greater than 4.0V with respect to the –INPUT pin
and be limited to less than 10V. To request the
Positive logic version, add the suffix (P) to the stan-
dard part number. The ON/OFF pin has a built-in pull
up resistor of approximately 100kΩ to +5V.
Undervoltage Hysteresis
1.0
Output Voltage
Normalized
0
30
31
32
33
34
35
36
37
Input Voltage (V)
Overvoltage Hysteresis
1.0
Output Voltage
Normalized
0
76.5
77
77.5
78
78.5
79
79.5
80
80.5
Input Voltage (V)
Part No. 02-GAM-04 Rev. 1.0 – 042805
WWW.GALAXYPWR.COM
Telephone: 508-870-9775
Fax: 508-870-9796
GAMW2V040 – 3
Galaxy Power Inc.
155 Flanders Road
Westborough, MA 01581
e-mail: info@galaxypwr.com
Application Notes
Output Over Voltage Protection:
The output voltage is constantly monitored by the
microprocessor with a redundant secondary-side
measurement circuit that both shuts down the duty
cycle and triggers the microprocessor to shut down.
If the output voltage exceeds the over-voltage specifi-
cation, the microprocessor will latch the converter off.
To turn the converter on requires either cycling the
ON/OFF pin or power to the converter. This ad-
vanced feature prevents the converter from damaging
the load if there is a converter failure or application
error. If non-latching is required, consult factory.
Thermal Shutdown:
The printed circuit board temperature is measured
using a semiconductor sensor. If the maximum rated
temperature is exceeded, the converter is latched off.
To re-enable the converter requires cycling the ON/
OFF pin or power to the converter. If non-latching is
required, consult factory.
Control Options:
As the behavior of the circuit is determined by
firmware in the microcontroller, specific customer
requirements such as
• non-latching thermal protection
• custom valid input voltage range
• controlled delay from initiating an ON/OFF signal
for power sequencing
can be accomplished with no change to hardware.
The standard behavior was chosen based on system
design experience but we understand that customers
often have their own requirements.
Please consult Galaxy Power for your special needs.
Remote Sense:
The output voltage is regulated at the point where
the sense pins connect to the power output pins.
Total sense compensation should not exceed 0.4V or
10% of Vout, whichever is greater.
Safety:
An external input fuse must always be used to meet
these safety requirements.
External Output Trimming
+ Sense
Trim:
To trim the output voltage higher, connect the
required trim resistor from the Trim pin to the
+Sense pin. To trim the output voltage lower, con-
nect the required trim resistor from the Trim pin to
the –Sense pin.
Trim-up
R
TRIM-UP
=
{
2 (100+∆%) (100+2∆%)
1.225∆% –
∆%
2.0V Trim-up
}
5.11kΩ
1000
Trim Resistance (kΩ)
100
10
0
1
2
3
4
5
6
7
8
9
10
Increase in Output Voltage (%)
Trim-down
R
TRIM-DOWN
=
{
100
–2
∆%
Trim-down
}
5.11kΩ
1000
Trim Resistance (kΩ)
100
10
0
1
2
3
4
5
6
7
8
9
10
Decrease in Output Voltage (%)
Trim
– Sense
GAMW2V040 – 4
WWW.GALAXYPWR.COM
155 Flanders Road
Westborough, MA 01581
Telephone: 508-870-9775
Part No. 02-GAM-04 Rev. 1.0 – 042805
Galaxy Power Inc.
Fax: 508-870-9796
e-mail: info@galaxypwr.com
GAMW2V04o Operation
Efficiency
92
90
14
Power Dissipation
Power Dissipation (W)
12
10
8
6
4
2
0
0
5
10
15
20
25
Efficiency (%)
88
86
84
82
80
78
76
0
5
10
15
20
25
30
35
40
36V Vin
48V Vin
75V Vin
36V Vin
48V Vin
75V Vin
30
35
40
Output Current (A)
Output Current (A)
Start Up
Voltage Ripple
CH2
CH1
CH3
1) Vout 1V/div 4mS/div
2) Iout 10A/div
3) Enable 5V/div
1) Vout 20mV/div 2µS/div
10µF ext cap 20MHz BW
Transient Response
2.04
2.03
2.02
2.01
2.00
1.99
1.99
1.98
1.97
0
1) Vout 200mV/div 200µS/div
2) Iout 10A/div
Line/Load Regulation
Setpoint Accuracy 0.4450%
Line Regulation 0.0847%
Load Regulation 0.0498%
Line & Load Regulation 0.1121%
CH1
CH2
Output Voltage (V)
36V Vin
48V Vin
75V Vin
5
10
15
20
25
30
35
40
Output Current (A)
Part No. 02-GAM-04 Rev. 1.0 – 042805
WWW.GALAXYPWR.COM
Telephone: 508-870-9775
Fax: 508-870-9796
GAMW2V040 – 5
Galaxy Power Inc.
155 Flanders Road
Westborough, MA 01581
e-mail: info@galaxypwr.com
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