Taurus Series, Page 1
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
The Taurus half brick is the first
CoolConverter
TM
in the Galaxy family of
high-efficiency DC/DC converters.
Industry Standard Pinout and Footprint
Typical Efficiency:
93% at 3.3V, 20A; 91% at 3.3V, 40A
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
Optional Baseplate or Low Profile Heatsink
for Improved Thermal Performance
Header with M3 Metal Inserts for Mechanical
Connection to PCB
Two Year Warranty
TAURUS Series
48V Input, 1.5V, 1.8V, 2.0V, 2.5V, 3.3VDC, 40A Output
or 5.0VDC, 30A Output
Control Functions
Uses Patented Power Supply Control
and Architecture
Microprocessor Controlled
Primary-side Enable, Choice of Logic
Protection Features
Over Temperature Protection
Over Voltage Protection
Over/Under Input Voltage Protection
Over Current Protection
Typical Characteristics
Output Setpoint Accuracy:
1%
Load Regulation:
0.25%
Line Regulation:
0.25%
Regulation over Line, Load, and Temperature:
2%
Low Output Ripple
Output Trim
The open-frame Taurus is available with an
optional baseplate or low profile heatsink.
Taurus Series, Page 2
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
General Specifications
V
IN
= 48V
DC
, T
A
@25
C, 300 LFM airflow, V
OUT
= 3.3V, 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
36
48
75
V
DC
Input Current (Model Dependent)
6.5
A
Input Capacitance
4.4
F
Input Hysteresis, Low Line
2
V
DC
Output Characteristics
Regulation Over Line, Load & Temperature
98
102
%V
NOM
Voltage Ripple
15
mV
RMS
Voltage Ripple, 20MHz BW
50
mV
PP
Current Range
0
40
A
Current Limit Inception
41
48
A
Short Circuit Current, Peak (see Note below)
50
A
Output Transient Response, 50% to 75% load change, 1A/
sec
125
mV
Settling Time to
1%
300
S
Turn-on Time to 98% Vnom
30
mS
Output Overshoot at Turn-on
1
%V
OUT
Trim Range
90
110
%V
OUT
Overvoltage Protection, Latching
130
%V
OUT
Isolation
Isolation Test Voltage, Input/Output (Basic)
2000
V
DC
Isolation Resistance
10
M
Features
Overtemperature Protection, Thermal Sensor, Latching*
117
C
Switching Frequency, Fixed
200
kHz
Notes: 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. For specific output voltage specifications, see the corresponding detailed data sheet.
*PCB less than 130
C.
General Specifications
Operating Temperature
-40
C to +100C
Storage Temperature
55
C to +125C
Relative Humidity
10% to 95% RH,
Non-condensing
Vibration
2 to 9Hz, 3mm disp.,
9 to 200Hz 1g
Material Flammability
UL V-0
Weight
55 grams
MTBF Telcordia (Bellcore)
1,600,000 hours
Approvals and Standards
UL and c-UL Recognized Component,
TUV, UL60950, CSA 22.2 No. 950,
IEC/EN60950**
EMC Characteristics:
Designed to meet emission and immunity
requirements per EN55022, CISPR22,
Class B and CISPR24.
** An external fuse shall be used to comply with the requirements.
Taurus Series, Page 3
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
CoolConverter
TM
Family
Galaxy's
C
OOL
C
ONVERTER
TM
Family features:
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 compared to planar magnetics and metal
baseplate designs.
Higher reliability than planar transformer designs that can
suffer from via fatigue from thermal cycling, and metal
baseplate designs with board to board interconnects that are
subject to mechanical stress on electrical connections.
Application Notes
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 semiconductor 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 below
1.0V with respect to the INPUT pin to enable the
converter. The pull-down must be able to sink
100
A. 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 standard part number. The ON/OFF pin has a
built-in pull-up resistor of approximately 100k
to
+5V.
70
35
72
36
74
37
76
38
78
39
80
40
48Vin:
24Vin:
30
15
32
16
34
17
36
18
38
19
40
20
48Vin:
24Vin:
Taurus Series, Page 4
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
APPLICATION NOTES
Output Over Voltage Protection:
The output voltage is constantly monitored by the
microprocessor and a redundant secondary side
crowbar circuit that is set to a higher trip point than
the microprocessor protection. If the output voltage
exceeds the over-voltage specification, 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 advanced
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 shutdown 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.
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,
connect the required trim resistor from the Trim pin
to the Sense pin. See diagram below.
External Output Trimming
+ Sense
Trim
Sense
Trim-down (%)
Trim-up (%)
Trim-down
Trim-up (for 3.3V)
R
TRIM-UP
=
Vo (100+
%)
(100+
2%)
k
1.225%
%
{
}
R
TRIM-DOWN
=
100
2 k
%
{
}
Taurus Series, Page 5
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
GPTW3V340 OPERATION
Efficiency
Power Dissipation
Load Current (A)
Load Current (A)
Ambient Air Temperature (deg C)
Transient Response
Voltage Ripple
Start-up Waveform
Thermal Derating Curves
V
OUT
Efficiency (%)
Power Dissipation (W)
2
1
Ch1
5.00mV
Ch2 1.00 V
B
W
B
W
M 4.00ms A Ch1 2.60V
T
Ch2 Max
3.30V
Ch2 +Over
1.212%
Ch2 High
3.26V
0
10
20
30
40
50
60
70
40
35
30
25
20
15
10
5
0
Iout (A)
300 LFM, Low Profile Heat Sink
200 LFM, Low Profile Heat Sink
300 LFM, Metal Plate
200 LFM, Metal Plate
300 LFM, Open Frame
200 LFM, Open Frame
100
98
96
94
92
90
88
86
84
82
80
0
10
20
30
40
36V Vin
48V Vin
75V Vin
36V Vin
48V Vin
75V Vin
V
OUT
I
OUT
20
10
Taurus Series, Page 6
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
MOUNTING INSERT
CONNECTED TO CASE PIN
MOUNTING INSERT
M3 X 0 .5 4 PLACES
B
B
B
B
A
A
A
A
A
.20
2.40
.19
2.28
1
.
900
0
2.000
1.700
1.500
1.300
1.000
.700
.500
.300
0
2.000
1.700
1.300
.700
.300
0
*NON-STANDARD PIN OUT
(CASE)
PIN 11
PIN 10 *
PIN 9
PIN 8
PIN 7
PIN 6 *
PIN 5
PIN 4
PIN 3
* PIN 2
PIN 1
BOTTOM VIEW
SIDE VIEW
.50
.50
.010
.20
0
Pin Configuration --Bottom View
Pin No.
Function
Pin Dia. (in.)
1
Input
0.040
2*
Case Ground Pin
0.040
3
On/Off
0.040
4
+ Input
0.040
5
+ Output
0.080
6*
+ Output
0.080
7
+ Sense
0.040
8
Trim
0.040
9
Sense
0.040
10*
Output
0.080
11
Output
0.080
Notes:
1. "A" = 0.040 dia. pins
2. "B" = 0.080 dia. pins
3. Optional pins marked*
4. Mechanical tolerances
x.xxx in. =
0.005 in.
x.xx in. =
0.01 in.
5. Pin material: brass with tin/lead plating over nickel
6. Workmanship: Meets or exceeds IPC-A-610B Class II
Package Detail
Taurus Series, Page 7
WWW.GALAXYPWR.COM
Part No. 99001 Rev. 5.0090803
**T (Tuned Model) Option
Designed for higher di/dt and
I applications, the
transient response has been modified to take
advantage of the capacitance on the customer's
PCB. This unit requires a minimum load
capacitance of 5600
F with an impedance
magnitude of less than 0.005
at 15kHz. It offers a
minimum 3X improvement in the peak response
compared to a standard unit.
Standard Model
Output
Max Typical Efficiency
Number
Voltage
Current
Half Load
Full Load
48V Input Models (Designated W)
GPTW5V030*
5.0V
30A
92%
90%
GPTW3V340*
3.3V
40A
93%
91%
GPTW2V540*
2.5V
40A
91%
88%
GPTW2V040*
2.0V
40A
90%
86%
GPTW1V840*
1.8V
40A
89%
84%
GPTW1V540*
1.5V
40A
88%
83%
Standard Model
Output
Max Typical Efficiency
Number
Voltage
Current
Half Load
Full Load
24V Input Models (Designated C)
GPTC5V030*
5.0V
30A
91%
89%
GPTC3V340*
3.3V
40A
92%
90%
GPTC2V540*
2.5V
40A
90%
87%
GPTC2V040*
2.0V
40A
89%
85%
GPTC1V840*
1.8V
40A
88%
83%
GPTC1V540*
1.5V
40A
87%
82%
* Options:
P
= Positive Logic Version; High = On
H = Extra Power Pins, Non-standard Pinout
E
= 0.18" Pins (
.01")
M = 0.145" Pins (
.01")
S
= 0.12" Pins (
.01")
RG = Heatsink Ready (incl. Plate + Case Ground Pin), or
with heatsink:
G00X = Case Ground Pin + Heatsink
T
= Tuned model**
Heatsinks optional, consult factory.
ORDERING INFORMATION
Galaxy Power Inc. warrants to the original purchaser that the products conform to this data sheet and are free from
material and workmanship defects for a period of two (2) years from the date of manufacture, if this product is used
within specified conditions. Galaxy Power Inc. reserves the right to make changes to the product(s) or information
contained herein without notice. No liability is assumed as a result of their use or application. No rights under any
patent accompany the sale of any such products or information. For additional details on this limited warranty
consult the factory.
Heatsink Part Numbers
Part
Typical Thermal Performance
Number
Height
Natural Convection
Forced Convection
Power Dissipation
Thermal Resistance
001
0.25"
5W
5.8
C/W
002
0.50"
7W
3.2
C/W
003
1.00"
11W
2.0
C/W
004
0.13"
TBD
TBD
Copyright 2000 Galaxy Power, Inc. Specifications subject to change without notice.
155 Flanders Road Westborough, MA 01581
508-870-9775 Fax: 508-870-9796
email: info@galaxypwr.com
website: http://www.galaxypwr.com
Ordering Information
Example Part No.:
GPTW3V340
48V input
3.3V @ 40A output
Negative Logic
0.20" pin length
Open Frame
Options Code:
(All options shown)
GPTW 3V3 40 P H S R G T 00X
Part Number
(from chart above)
Options:
Positive Logic Version
Extra Power Pins
Optional Pin Length
E = 0.18"
M = 0.145"
S = 0.12"
Heatsink-ready plate (requires G)
Case Ground Pin
Tuned Model
Heatsink (does not require R, must have G)
001 = 0.25"
002 = 0.50"
003 = 1.00"
004 = 0.13"
PDF 
ZIP