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24V or 48V Input, 1.5V, 1.8V, 2.0V, 2.5V, 3.3V DC, 20A Output or 5.0V DC, 15A Output 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
The Dorado is available with an optional low profile heatsink for improved thermal performance.
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
Dorado, Page 1
PRODUCT PREVIEW
Part No. 01-002 Rev. 1.0-110802
General Specifications
VIN = 48VDC, TA@25C, 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 Input Current Input Capacitance Input Hysteresis, Low Line Output Characteristics Regulation Over Line, Load & Temperature Voltage Ripple Voltage Ripple, 20MHz BW Current Range Current Limit Inception Short Circuit Current, Peak (see Note below) Output Transient Response, 50% to 75% load change, 1A/sec Settling Time to 1% Turn-on Time to 98%Vnom Output Overshoot at Turn-on Trim Range Overvoltage Protection, Latching Isolation Isolation Test Voltage, Input/Output (Basic) Isolation Resistance Features Overtemperature Protection, Thermal Sensor, Latching* Switching Frequency, Fixed
36
48 2 2
75 4
VDC A F VDC %VNOM mV RMS mV P-P A A A %VOUT S mS %VOUT %VOUT %VOUT VDC M
98
102 20 100
0 22
20 27 30 5 300 30 1
60 130 2000 10
110
117 300
C 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 130C
General Specifications
Operating Temperature Storage Temperature Relative Humidity -40C to +100C -55C to +125C 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
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 2
PRODUCT PREVIEW
Part No. 01-002 Rev. 1.0-110802
Application Notes CoolConverterTM
Galaxy's proprietary CoolConverterTM 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.
Input Current
Overvoltage Lockout
Voltage Rising Voltage Falling
75
76
77
78
79
80
Input Voltage (V)
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 builtin pull up resistor of approximately 100 k.
Undervoltage Lockout
Input Current
Voltage Rising Voltage Falling
30
32
34
36
38
40
Input Voltage (V)
Dorado, Page 3
PRODUCT PREVIEW
Part No. 01-002 Rev. 1.0-110802
Application Notes
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.
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
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.
Trim-down (%)
RTRIM-DOWN =
{
100 -2 %
}
5.11k
Trim-up
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.
RTRIM-UP =
Safety:
An external input fuse must always be used to meet these safety requirements.
{
VO(100+%) (100+2%) - 5.11k 1.225% %
}
External Output Trimming
+ Sense
Trim
- Sense
Dorado, Page 4
PRODUCT PREVIEW
Part No. 01-002 Rev. 1.0-110802
PACKAGE DETAIL
MOUNTING INSERT CONNECTED TO CASE PIN 1.030 PIN 1 .815 1.45 PIN 2 .515 PIN 3 .215 0 .210 BOTTOM VIEW .210 A A B A A 2.28
1.030 .815 .665 .515 .365 .215 0 MOUNTING INSERT M3 X 0.5 4 PLACES PIN 8 PIN 7 PIN 6 PIN 5 PIN 4
Pin
Function
Pin Dia. (in.)
0
2.000 PIN TO PIN .20 0 .50 (opt. L = .465) SIDE VIEW .030 .50
1.860
.070
1 2 3 4 5 6 7 8
- Input On/Off + Input + Output + Sense Trim - Sense - Output
0.040 0.040 0.040 0.060 0.040 0.040 0.040 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
Dorado, Page 5
PRODUCT PREVIEW
Part No. 01-002 Rev. 1.0-110802
ORDERING INFORMATION
Standard Model Number Output Voltage Max Current Efficiency Half Load Full Load Standard Model Number Output Voltage Max Current Efficiency Half Load Full Load
48V Input Models (Designated W) GPDW5V015R* 5.0V 15A GPDW3V320R* 3.3V 20A GPDW2V520R* 2.5V 20A GPDW2V020R* 2.0V 20A GPDW1V820R* 1.8V 20A GPDW1V520R* 1.5V 20A Heatsink Part Numbers
Part Number Height
TBD
24V Input Models (Designated C) GPDC5V015R* 5.0V 15A GPDC3V320R* 3.3V 20A GPDC2V520R* 2.5V 20A GPDC2V020R* 2.0V 20A GPDC1V820R* 1.8V 20A GPDC1V520R* 1.5V 20A
TBD
Typical Thermal Performance Natural Convection Forced Convection Power Dissipation* Thermal Resistance**
001 002 003 004
0.25" 0.50" 1.00" 0.13"
5W 7W 11W TBD
5.8C/W 3.2C/W 2.0C/W TBD
** @ 300'/min.
* 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 5600F 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.
*@ 60C rise heatsink to ambient
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.
155 Flanders Road Westborough, MA 01581 508-870-9775 Fax: 508-870-9796 e-mail: galaxy@galaxypwr.com website: http://www.galaxypwr.com
Dorado, Page 6
(c) Copyright 2002 Galaxy Power. Specifications subject to change without notice.
PRODUCT PREVIEW
Part No. 01-002 Rev. 1.0-110802

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