Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
GMDW12V08
DORADO MV DC/DC CONVERTERS
48V Input – 12VDC – 8A Output
Control Functions
page 1
GMDW12V08 – 1/4 Brick Dorado MV Series
Ordering Information
• Industry standard pinout and footprint
• High efficiency: 86% at 12V, 8A; 88% at 12V, 4A
• Low profile
• 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
• 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
† @ 60˚ C rise heat sink to ambient ‡ @ 300'/min.
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
Dorado MV Heat Sink
Part Numbers
Standard Model Number Input Voltage Output Voltage Max Current
GMDW12V08* 48V 12V 8A
* Options:
P = Positive Logic Version;
High = On
R = Heat Sink-Ready
L = Low Profile
(0.465" height)
M = 0.145" Pins (± .01")
S = 0.12" Pins (± .01"
Example Part Number:
(All options)
GMDW12V08 PSR 00X L
Part Number
Options:
Positive Logic Version
Optional Pin Lengths
M = 0.145"
S = 0.12"
Heat Sink-Ready
Heat Sink
001 = 0.25"
002 = 0.50"
003 = 1.00"
004 = 0.13"
Low Profile
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
GMDW12V08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
DORADO MV DC/DC CONVERTERS
48V Input – 12VDC – 8A Output
page 2
Input Specifications
Parameter Min Typical Max Units
Operating Input Voltage 36 48 75 VDC
Input Current 4 A
Input Capacitance 2 µF
Input Hysteresis, Low Line 2 VDC
VIN = 48VDC, TA@25˚ C, 300 LFM Airflow, VOUT = 12VDC, IOUT = Full load unless otherwise noted.
Available output power depends on ambient temperature and good thermal management.
(See application graphs for limits.)
Output Specifications
Parameter Min Typical Max Units
Regulation Over Line, Load & Temperature 98 102 %VNOM
Voltage Ripple 20 mV RMS
Voltage Ripple, 20MHz BW 100 mV P–P
Current Range 0 8 A
Current Limit Inception 110 125 %IOUT
Output Transient Response, 50% to 75% Load Change, 1A/µsec 5 %VOUT
Settling Time to ± 1% 400 µS
Turn-on Time to 98% Vnom 300 mS
Output Overshoot at Turn-on 1 %VOUT
Trim Range 60 110 %VOUT
Over Voltage Protection, Non-Latching 125 %VOUT
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
GMDW12V08
DORADO MV DC/DC CONVERTERS
48V Input – 12VDC – 8A Output
page 3
General Specifications
Operating Temperature -40˚ C to + 100˚ C
Storge Temperature -55˚ C + 125˚ C
Relative Humidity 10% to 95% RH, Non-condensing
Vibration 2 to 9 Hz, 3mm disp., 9 to 200 Hz, 1g
Material Flammability UL V-0
Weight 30 grams
MTBF Telcordia (Bellcore) 2.0 million 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.
Isolation Specifications
Parameter Min Typical Max Units
Isolation Test Voltage, Input/Baseplate/Output (Basic) 2000 VDC
Isolation Resistance 10 MΩ
1. PCB less than 130˚ C.
Features
Parameter Min Typical Max Units
Over Temperature Protection, Thermal Sensor, Non-latching1117 ˚ C
Switching Frequency, Fixed 300 kHz
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
GMDW12V08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
DORADO MV DC/DC CONVERTERS
48V Input – 12VDC – 8A Output
page 4
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.
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 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.
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 non-
latching is required, consult factory.
• An advanced microcontroller reduces parts count while
adding features, performance and flexibility in the design.
Under Voltage Hysteresis
1.0
0
30 34 37
Input Voltage (V)
Output Voltage
Normalized
3632 33 3531
Over Voltage Hysteresis
1.0
0
76.5 78.5 80.5
Input Voltage (V)
Output Voltage
Normalized
79.577.5 78 807977
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
GMDW12V08
DORADO MV DC/DC CONVERTERS
48V Input – 12VDC – 8A Output
page 5
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. 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 these
safety requirements.
External Output Trimming
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.
CoolConverter™
Trim-down
+Sense
Trim
–Sense
Trim
Up
Trim
Down
10K
Trimpot
Increase in Output Voltage (%)
10000
1000
100
012 3 4 5 6 7 8 9 10
Trim Resistance (kΩ)
12.0V Trim-up
Decrease in Output Voltage (%)
1000
100
10
012 3 4 5 6 7 8 9 10
Trim Resistance (kΩ)
Trim-down
RTRIM-UP = 12 (100+∆%) _ (100+2∆%) 5.11kΩ
1.225∆% ∆%
{ }
RTRIM-DOWN = 100 _ 2 5.11kΩ
∆%
{ }
Trim-up
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
GMDW12V08
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 • Tel 508-870-9775 • Fax 508-870-9796 • www.belpower.com
DORADO MV DC/DC CONVERTERS
48V Input – 12VDC – 8A Output
page 6
Efficiency Data Power Dissipation
Start Up Voltage Ripple
Transient Response
1. VOUT 5V/div 20mS/div
2. Enable 5V/div
1. VOUT 20mV/div 2µS/div
1. VOUT 200mV/div 1ms/div
2. Enable 100mV/div
Line/Load Regulation
12.000
12.040
12.080
12.120
12.160
12.200
0 4 8
Output Current (A)
Output Voltage (V)
36V Vin
48V Vin
75V Vin
CORPORATE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
FAR EAST
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
EUROPE
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
©2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
POWER PRODUCTS
DORADO MV DC/DC CONVERTERS
GMDW12V08
48V Input – 12VDC – 8A Output
page 7
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
Pin Configuration – Bottom View
Mechanical
GMDW12V08
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.
