DORADO MV DC/DC CONVERTERS
POWER PRODUCTS
24V Input – 12VDC – 8A Output
GMDC12V08
GMDC12V08 – 1/4 Brick Dorado MV Series
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Industry standard pinout and footprint
High efficiency: 86% at 12V, 8A; 88% at 12V, 4A
Very low common-mode noise for a commercial DC/DC converter
Constant switching frequency
Remote sense
Single board design
Optional low profile heat sink for improved thermal performance
Header with M3 metal inserts for mechanical connection to PCB
Optional low profile
Control Functions
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Uses innovative control and power
topology for lower parts count
Microprocessor controlled
Primary-side enable, choice of logic
Industry standard output trim
Typical Characteristics
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Protection Features
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Over temperature protection
Over voltage protection
Over current protection
Over/Under input voltage protection
Output setpoint accuracy: ± 1.5%
Load regulation: ± 0.25%
Line regulation: ± 0.25%
Regulation over line, load and temperature: ± 3%
Low output ripple
Ordering Information
Standard Model Number
Input Voltage
Output Voltage
Max Current
24V
12V
8A
GMDC12V08*
* Options:
P = Positive Logic Version;
High = On
Example Part Number:
(All options)
E = 0.18" Pins (± .01")
M = 0.145" Pins (± .01")
Dorado MV Heat Sink
Part Numbers
S = 0.12" Pins (± .01")
R = Heat Sink-Ready
Typical Thermal Performance
Part
Number
Height
Natural Convection
Power Dissipation†
Forced Convection
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 heat sink to ambient
‡ @ 300'/min.
GMDC12V08 P S R 0 0 X
Part Number
Options:
Positive Logic Version
Optional Pin Lengths
E = 0.18"
M = 0.145"
S = 0.12"
Heat Sink-Ready
Heat Sink
001 = 0.25"
002 = 0.50"
003 = 1.00"
004 = 0.13"
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 1
POWER PRODUCTS
DORADO MV DC/DC CONVERTERS
24V Input – 12VDC – 8A Output
GMDC12V08
Input Specifications
Parameter
Operating Input Voltage
Min
Typical
Max
Units
18
24
36
VDC
4
A
Input Current
Input Capacitance
6
µF
Input Hysteresis, Low Line
1
VDC
VIN = 24VDC, TA@25˚ C, 300 LFM Airflow, VOUT = 12VDC, IOUT = 8A unless otherwise noted.
Available output power depends on ambient temperature and good thermal management.
(See application graphs for limits.)
Output Specifications
Parameter
Min
Max
Units
103
%VNOM
Voltage Ripple
20
mV RMS
Voltage Ripple, 20MHz BW
60
mV P–P
8
A
Regulation Over Line, Load & Temperature
Current Range
Current Limit Inception
Typical
97
0
105
120
Output Transient Response, 50% to 75% Load Change, 1A/µsec
%IOUT
5
%VOUT
Settling Time to ± 1%
400
µS
Turn-on Time to 98% Vnom
300
mS
Output Overshoot at Turn-on
0
%VOUT
110
%VOUT
Trim Range
60
Over Voltage Protection, Latching
©2006 Bel Fuse Inc.
125
%VOUT
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 2
DORADO MV DC/DC CONVERTERS
POWER PRODUCTS
24V Input – 12VDC – 8A Output
GMDC12V08
Isolation Specifications
Parameter
Min
Isolation Test Voltage, Input/Baseplate/Output (Basic)
2000
VDC
10
MΩ
Isolation Resistance
Typical
Max
Units
Features
Parameter
Min
Typical
Over Temperature Protection, Thermal Sensor1
Switching Frequency, Fixed
Max
Units
117
˚C
300
kHz
1.PCB less than 130˚ C.
Approvals and Standards
General Specifications
Operating Temperature
Storge Temperature
Relative Humidity
Vibration
Material Flammability
Weight
-40˚ C to + 100˚ C
-55˚ C + 125˚ C
10% to 95% RH, Non-condensing
2 to 9 Hz, 3mm disp., 9 to 200 Hz, 1g
UL V-0
30 grams
MTBF Telcordia (Bellcore)
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.
2.0 million hours
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 3
POWER PRODUCTS
DORADO MV DC/DC CONVERTERS
24V Input – 12VDC – 8A Output
GMDC12V08
Application Notes
CoolConverter™
Bel Power’s Proprietary CoolConverter™
• 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 results from lower capacitance
in the transformer from balanced winding design.
Protection and Control
Over Voltage Hysteresis
1.0
Normalized
Output Voltage
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 to below 1.0V with respect to the
–INPUT pin to enable the converter. The pull-down must be
able to sink 100µA. 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
100kΩ to +5V.
0
76.5
77
77.5
78
78.5
79
79.5
80
80.5
Input Voltage (V)
Under Voltage Hysteresis
©2006 Bel Fuse Inc.
Normalized
Output Voltage
1.0
Output Over Voltage Protection
The output voltage is constantly monitored by the
microprocessor with a redundant secondary-side
measurement circuit that both shuts down the duty cycle and
triggers the microprocessor to shut down. If the output voltage
exceeds the over voltage specification, the microprocessor
will latch the converter off. To turn the converter on required
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 nonlatching is required, consult factory.
0
30
31
32
33
34
35
36
Input Voltage (V)
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 4
37
DORADO MV DC/DC CONVERTERS
POWER PRODUCTS
24V Input – 12VDC – 8A Output
GMDC12V08
CoolConverter™
Protection and Control
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.
Trim-up
Rtrim-UP
{
=
12 (100+∆%) _ (100+2∆%)
1.25∆%
∆%
}
5.11kΩ
12.0V Trim-up
Safety
An external input fuse must always be used to meet these
safety requirements.
Trim Resistance (kΩ)
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.
10000
1000
100
External Output Trimming
0
1
2
3
4
5
6
7
8
9
10
Increase in Output Voltage (%)
+Sense
Trim
Up
Trim
10K
Trimpot
Trim
Down
Trim-down
–Sense
Rtrim-DOWN =
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 the diagrams at right.
{
}
100 _ 2
∆%
5.11kΩ
Trim-down
Trim Resistance (kΩ)
1000
100
10
0
1
2
3
4
5
6
7
8
9
10
Decrease in Output Voltage (%)
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 5
DORADO MV DC/DC CONVERTERS
POWER PRODUCTS
24V Input – 12VDC – 8A Output
GMDC12V08
Efficiency Data
Power Dissipation
Start Up
Voltage Ripple
1.VOUT 12mV/div 20µS/div
1. VOUT 12V/div 80ms/div
2. IOUT 8A/div
Transient Response
Line/Load Regulation
Output Voltage (V)
12.100
12.060
12.020
11.980
18V Vin
24V Vin
36V Vin
11.940
11.900
0
4
8
Output Current (A)
1. VOUT 200mV/div 1µs/div
2. Enable 100mV/div
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
page 6
DORADO MV DC/DC CONVERTERS
24V Input – 12VDC – 8A Output
POWER PRODUCTS
GMDC12V08
Mechanical
GMDC12V08
Pin Configuration – Bottom View
Pin
Function
Pin Dia. (In.)
1
+ Input
0.040
2
On/Off
0.040
3
– Input
0.040
4
– Output
0.060
5
– Sense
0.040
6
Trim
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
4. "A" = 0.040" dia. pins
5. "B" = 0.060" dia. pins
6. Min. screw length for heat sink attachment
= 4.5mm + heat sink flange + locking hardware
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other
hazardous substances from electronic products. These parts are not however compatible with
the higher temperatures associated with lead free solder processes and must be soldered using
a reflow profile with a peak temperature of no more than 240˚C.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 11.06
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
page 7