Dorado MV, Page 1
Part No. 01-002 Rev. 1.0110702
PRELIMINARY
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
DORADO MV
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
The Dorado MV is available with an optional
low profile heatsink for improved thermal
performance.
24V or 48V Input,
8.0V, 12.0V DC, 8A Output
15.0V DC, 6A Output
Dorado MV, Page 2
Part No. 01-002 Rev. 1.0110702
PRELIMINARY
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
30 grams
MTBF
Telcordia (Bellcore)
2,000,000 hours
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
4
A
Input Capacitance
2
F
Input Hysteresis, Low Line
2
V
DC
Output Characteristics
Regulation Over Line, Load & Temperature
98
102
%V
NOM
Voltage Ripple
20
mV
RMS
Voltage Ripple, 20MHz BW
100
mV
PP
Current Range
0
8
A
Output Transient Response, 50% to 75% load change, 1A/
sec
5
%V
OUT
Settling Time to
1%
400
S
Turn-on Time to 98%Vnom
300
mS
Output Overshoot at Turn-on
1
%V
OUT
Trim Range
60
110
%V
OUT
Overvoltage Protection, Non-latching
130
%V
OUT
Isolation
Isolation Test Voltage, Input/Output (Basic)
2000
V
DC
Isolation Resistance
10
M
Features
Overtemperature Protection, Thermal Sensor, Non-latching*
117
C
Switching Frequency, Fixed
300
kHz
*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 MV, Page 3
Part No. 01-002 Rev. 1.0110702
PRELIMINARY
Undervoltage Lockout
30
32
36
34
40
38
Input Voltage (V)
Input Curr
ent
Voltage
Rising
Voltage
Falling
Overvoltage Lockout
75
76
78
77
80
79
Input Voltage (V)
Input Curr
ent
Voltage
Rising
Voltage
Falling
CoolConverter
TM
Galaxy's proprietary CoolConverter
TM
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
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.
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 100k
.
Application Notes
Dorado MV, Page 4
Part No. 01-002 Rev. 1.0110702
PRELIMINARY
Output Over Voltage Protection:
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 over-
voltage 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.
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 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.
Trim-down (%)
Trim-down
R
TRIM-DOWN
=
100
2
5.11k
%
{ }
Trim-up (for 3.3V)
R
TRIM-UP
=
V
O
(100+
%)
(100+
2%)
5.11k
1.225%
%
{
}
External Output Trimming
Application Notes
+ Sense
Trim
Sense
Dorado MV, Page 5
Part No. 01-002 Rev. 1.0110702
PRELIMINARY
GMDW12V08 Operation
18
16
14
12
10
8
6
4
2
0
0
6.0
8.0
Output Current (A)
Power Dissipation (W)
2.0
4.0
36V Vin
48V Vin
75V Vin
89
87
85
83
81
79
77
75
0
2.0
6.0
8.0
Output Current (A)
Ef
ficiency (%)
36V Vin
48V Vin
75V Vin
4.0
20.0mV
20.0mV
1
2
Ch1
5.00V
Ch2 5.00 V
M 20.0ms A Ch2 2.70V
T
T
[
]
2
1
Ch1
200mV
Ch2
100mV
M 1.00ms A
Ch2
96.0mV
T
T
[
]
Transient Response
Power Dissipation
Efficiency
Start-up
Voltage Ripple
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