Dorado, Page 1 Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
Industry's Lowest Cost High-efficiency
DC/DC Converter
Industry Standard Quarter Brick Pinout and
Footprint
Typical Efficiency: 83% at 3.3V, 15A
Low Profile
Very Low Common-mode Noise for a
Commercial DC/DC Converter
Constant Switching Frequency
Remote Sense
Uses Innovative Control and Power Topology
for Lower Parts Count
Single Board Design
Optional Low Profile Heatsink for Improved
Thermal Performance
Header with M3 Metal Inserts for Mechanical
Connection to PCB
Two Year Warranty
DORADO
Control Functions
Microprocessor Controlled
Primary-side Enable, Choice of Logic
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
Industry Standard Output Trim
The Dorado is available with an optional low profile
heatsink for improved thermal performance.
24V or 48V Input, 1.5V, 1.8V, 2.0V, 2.5V, 3.3V DC,
20A Output or 5.0V DC, 15A Output
Dorado, Page 2 Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
General Specifications
Operating Temperature -40°C to +100°C
Storage Temperature -55°C to +125°C
Relative Humidity 10% to 95% RH,
Non-condensing
Vibration 2 to 9Hz, 3mm disp.,
9 to 200Hz 1g
Material Flammability UL V-0
Weight 30 grams
MTBF Telcordia (Bellcore) 2,000,000 hours
General Specifications
VIN = 48VDC, TA@25
°
C, 300 LFM Airflow, VOUT = 3.3V, IOUT = 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 VDC
Input Current 4A
Input Capacitance 2 µF
Input Hysteresis, Low Line 2 VDC
Output Characteristics
Regulation Over Line, Load & Temperature 98 102 %VNOM
Voltage Ripple 20 mV RMS
Voltage Ripple, 20MHz BW 100 mV P–P
Current Range 0 20 A
Current Limit Inception 22 27 A
Short Circuit Current, Peak (see Note below) 30 A
Output Transient Response, 50% to 75% load change, 1A/µsec 5 %VOUT
Settling Time to ±1% 300 µS
Turn-on Time to 98%Vnom 30 mS
Output Overshoot at Turn-on 1 %VOUT
Trim Range 60 110 %VOUT
Overvoltage Protection, Latching 130 %VOUT
Isolation
Isolation Test Voltage, Input/Output (Basic) 2000 VDC
Isolation Resistance 10 MΩ
Features
Overtemperature Protection, Thermal Sensor, Latching* 117 °C
Switching Frequency, Fixed 300 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
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.
Dorado, Page 3 Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
Undervoltage Lockout
30 32 3634 4038
Input Voltage (V)
Input Current
Voltage
Rising
Voltage
Falling
Overvoltage Lockout
75 76 7877 8079
Input Voltage (V)
Input Current
Voltage
Rising
Voltage
Falling
CoolConverter™
Galaxy’s proprietary CoolConverter™ provides:
•Patent Pending 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.
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 1.0 V
with respect to the –INPUT pin to enable the converter.
For Positive logic, the ON/OFF pin is brought to greater
than 4.0 V with respect to the –INPUT pin. To request
the Positive logic version, add the suffix (P) to the
standard part number. The positive version has a built-
in pull up resistor of approximately 100 kΩ.
Application Notes
Dorado, Page 4 Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
Output Over Voltage Protection:
The output voltage is constantly monitored by the
microprocessor and a parallel regulation path with an
independent reference. 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 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.
Trim-down (%)
Trim-down
RTRIM-DOWN =100 – 2 5.11kΩ
∆%
{ }
Trim-up
RTRIM-UP =VO(100+∆%) – (100+2∆%) 5.11kΩ
1.225∆% ∆%
{ }
External Output Trimming
Application Notes
+ Sense
Trim
–
Sense
Dorado, Page 5 Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
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PIN 2
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Pin Function Pin Dia. (in.)
1– Input 0.040
2On/Off 0.040
3+ Input 0.040
4+ Output 0.060
5+ Sense 0.040
6Trim 0.040
7– Sense 0.040
8– Output 0.060
Notes:
1. Mechanical tolerances
x.xxx in. = ±0.005 in.
x.xx in. = ±0.01 in.
2. Pin material: brass with tin/lead plating over nickel
3. Workmanship: Meets or exceeds IPC-A-610B Class II
PACKAGE DETAIL
Dorado, Page 6 Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
ORDERING INFORMATION
Standard
Model Output Max Efficiency
Number Voltage Current Half Load Full Load
48V Input Models (Designated W)
GPDW5V015R* 5.0V 15A TBD
GPDW3V320R* 3.3V 20A
GPDW2V520R* 2.5V 20A
GPDW2V020R* 2.0V 20A
GPDW1V820R* 1.8V 20A
GPDW1V520R* 1.5V 20A
Standard Model Output Max Efficiency
Number Voltage Current Half Load Full Load
24V Input Models (Designated C)
GPDC5V015R* 5.0V 15A TBD
GPDC3V320R* 3.3V 20A
GPDC2V520R* 2.5V 20A
GPDC2V020R* 2.0V 20A
GPDC1V820R* 1.8V 20A
GPDC1V520R* 1.5V 20A
* Options:
P=Positive Logic Version: High = On
M= 0.145" Pins (
±
.01")
S=0.12" Pins (
±
.01")
R=Heatsink Ready
T=Tuned model**
L=Low Profile (0.465" height)
Heatsinks optional, consult factory.
**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 5600µF with an impedance
magnitude of less than 0.005Ω at 15kHz. It
offers a minimum 3X improvement in the peak
response compared to a standard unit.
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
*@ 60
°
C rise heatsink to ambient ** @ 300'/min.
Ordering Information
Example Part No:
GPDW3V320R
48V Input
3.3V@20A Output
Negative Logic
0.20" Pin Length
Heatsink Ready
Options Code:
GPDW3V320 P S R T 00X L
Part No.
Options:
Positive Logic Version
Optional Pin Lengths
M = 0.145"
S = 0.12"
Heatsink Ready
Tuned Model
Heatsink
Low Profile 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.
© Copyright 2002 Galaxy Power. Specifications subject to change without notice.
155 Flanders Road Westborough, MA 01581
508-870-9775 Fax: 508-870-9796
e–mail: galaxy@galaxypwr.com
website: http://www.galaxypwr.com