DORADO MV
24V or 48V Input,
8.0V, 12.0V DC, 8A Output
15.0V DC, 6A Output
The Dorado MV is available with an optional
low profile heatsink for improved thermal
performance.
Industry's Lowest Cost High-efficiency
DC/DC Converter
Industry Standard Quarter Brick Pinout and
Footprint
Typical Efficiency: 86% at 12V, 8A
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
Control Functions
Microprocessor Controlled
Primary-side Enable, Choice of Logic
Industry Standard Output Trim
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
Dorado MV, Page 1
PRELIMINARY
Part No. 01-002 Rev. 1.0–110702
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
Input Current
Input Capacitance
Input Hysteresis, Low Line
36
48
75
4
VDC
A
µF
VDC
102
%VNOM
Voltage Ripple
20
mV RMS
Voltage Ripple, 20MHz BW
100
mV P–P
8
A
5
%VOUT
Settling Time to ±1%
400
µS
Turn-on Time to 98%Vnom
300
mS
Output Overshoot at Turn-on
1
%VOUT
110
%VOUT
2
2
Output Characteristics
Regulation Over Line, Load & Temperature
98
Current Range
0
Output Transient Response, 50% to 75% load change, 1A/µsec
Trim Range
60
Overvoltage Protection, Non-latching
130
%VOUT
Isolation
Isolation Test Voltage, Input/Output (Basic)
Isolation Resistance
2000
VDC
10
MΩ
Features
Overtemperature Protection, Thermal Sensor, Non-latching*
°C
117
Switching Frequency, Fixed
300
kHz
*PCB less than 130°C
General Specifications
Operating Temperature
Storage Temperature
Relative Humidity
Approvals and Standards
-40°C to +100°C
-55°C to +125°C
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
Dorado MV, Page 2
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.
PRELIMINARY
Part No. 01-002 Rev. 1.0–110702
Application Notes
CoolConverter™
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.
Protection and Control
Overvoltage Lockout
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
Valid Input Voltage Range:
Voltage
Rising
Voltage
Falling
75
77
78
79
80
Input Voltage (V)
Undervoltage Lockout
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.
For Positive logic, the ON/OFF pin is brought to greater
than 4.0V with respect to the –INPUT pin. To request
the Positive logic version, add the suffix (P) to the
standard part number. The Enable pin has a built-in pull
up resistor of approximately 100kΩ.
Input Current
ON/OFF Logic Option:
Dorado MV, Page 3
76
PRELIMINARY
Voltage
Rising
Voltage
Falling
30
32
34
36
38
40
Input Voltage (V)
Part No. 01-002 Rev. 1.0–110702
Application Notes
Output Over Voltage Protection:
Trim-down
The output voltage is constantly monitored by the
microprocessor and a redundant secondary-side circuit
that is set to a higher trip point than the microprocessor
protection. If the output voltage exceeds the overvoltage specification, the microprocessor will restart
every 4 seconds and limit voltage with a separate
reference circuit. This advanced feature prevents the
converter from damaging the load if there is a converter
failure or application error.
Thermal Shutdown:
The printed circuit board temperature is measured
using a semiconductor sensor. If the maximum rated
temperature is exceeded, the converter is turned off. It
will then restart every 4 seconds.
Trim-down (%)
RTRIM-DOWN =
Remote Sense:
{
100
–2
∆%
}
5.11kΩ
Trim-up (for 3.3V)
The output voltage is regulated at the point where the
sense pins connect to the power output pins. Total sense
compensation should not exceed 1V.
Safety:
An external input fuse must always be used to meet
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 following diagrams.
RTRIM-UP =
{
}
VO(100+∆%) (100+2∆%)
–
5.11kΩ
1.225∆%
∆%
External Output Trimming
+ Sense
Trim
– Sense
Dorado MV, Page 4
PRELIMINARY
Part No. 01-002 Rev. 1.0–110702
GMDW12V08 Operation
Power Dissipation
89
18
87
16
Power Dissipation (W)
Efficiency (%)
Efficiency
85
83
81
36V Vin
48V Vin
75V Vin
79
77
14
12
10
8
6
36V Vin
48V Vin
75V Vin
4
2
0
75
0
4.0
2.0
8.0
6.0
2.0
0
Output Current (A)
6.0
8.0
Output Current (A)
Transient Response
[
4.0
Voltage Ripple
]
T
T
1
2
Ch1 200mV
Ch2
100mV
M 1.00ms A
Ch2
96.0mV
20.0mV
20.0mV
Start-up
[
]
T
T
1
2
Ch1 5.00V
Dorado MV, Page 5
Ch2
5.00 V
M 20.0ms A
PRELIMINARY
Ch2
2.70V
Part No. 01-002 Rev. 1.0–110702
PACKAGE DETAIL
2.28
MOUNTING INSERT
CONNECTED TO CASE PIN
1.030
1.45
1.030
PIN 1 .815
A
PIN 2 .515
A
B
A
A
PIN 3 .215
0
.210
.815
.665
.515
.365
.215
PIN 8
PIN 7
PIN 6
PIN 5
PIN 4
0
BOTTOM VIEW
MOUNTING INSERT
M3 X 0.5 4 PLACES
.210
0
1.860
.070
Pin
Function
Pin Dia. (in.)
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
2.000
PIN TO PIN
.20
0
.50
(opt. L = .465)
.030
.50
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
SIDE VIEW
Dorado MV, Page 6
PRELIMINARY
Part No. 01-002 Rev. 1.0–110702
ORDERING INFORMATION
Standard Model
Number
Output
Voltage
Max
Current
48V Input Models (Designated W)
GMDW8V08R
8V
8A
GMDW12V08R
12V
8A
GMDW15V06R
15V
6A
Typical Efficiency
Half Load
Full Load
86
TBD
Height
001
0.25"
5W
5.8°C/W
002
003
004
0.50"
1.00"
0.13"
7W
11W
TBD
3.2°C/W
2.0°C/W
TBD
Typical Thermal Performance
Natural Convection
Forced Convection
Power Dissipation*
Thermal Resistance**
*@ 60°C rise heatsink to ambient
Max
Current
Typical Efficiency
Half Load
Full Load
TBD
TBD
TBD
* Options:
P = Positive Logic Version: High = On
M = 0.145" Pins (±.01")
S = 0.12" Pins (±.01")
R = Heatsink Ready
L = Low Profile (0.465" height)
Heatsink Part Numbers
Part
Number
Output
Voltage
24V Input Models (Designated C)
GMDC8V08R
8V
8A
GMDC12V08R
12V
8A
GMDC15V06R
15V
6A
TBD
88
Standard Model
Number
** @ 300'/min.
Ordering Information
Example Part No:
GMDW12V08R
48V Input
12V@8A Output
Negative Logic
0.20" Pin Length
Heatsink Ready
Options Code:
GMDW12V08 P S R 00X L
Part No.
Options:
Positive Logic Version
Optional Pin Lengths
M = 0.145"
S = 0.12"
Heatsink Ready
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: [email protected]
website: http://www.galaxypwr.com
Dorado MV, Page 7
PRELIMINARY
Part No. 01-002 Rev. 1.0–110702
© Copyright 2002 Galaxy Power. Specifications subject to change without notice.