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DORADO MV DC/DC CONVERTERS
24V Input - 12VDC - 8A Output GMDC12V08 - 1/4 Brick Dorado MV Series
* * * * * * * * * 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
POWER PRODUCTS
GMDC12V08
Control Functions
* * * * Uses innovative control and power topology for lower parts count Microprocessor controlled Primary-side enable, choice of logic Industry standard output trim
Typical Characteristics
* * * * * Output setpoint accuracy: 1.5% Load regulation: 0.25% Line regulation: 0.25% Regulation over line, load and temperature: 3% Low output ripple
Protection Features
* * * * Over temperature protection Over voltage protection Over current protection Over/Under input voltage protection
Ordering Information
Standard Model Number GMDC12V08* * Options: P = Positive Logic Version; High = On Input Voltage 24V Output Voltage 12V Max Current 8A S = 0.12" Pins ( .01") R = Heat Sink-Ready Example Part Number: (All options)
GMDC12V08 P S R 0 0 X
E = 0.18" Pins ( .01") M = 0.145" Pins ( .01") 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"
Specifications subject to change without notice. 11.06
Dorado MV Heat Sink Part Numbers
Part Number 001 002 003 004 Height 0.25" 0.50" 1.00" 0.13"
Typical Thermal Performance Natural Convection Power Dissipation 5W 7W 11W TBD @ 300'/min. Forced Convection Thermal Resistance 5.8 C/W 3.2 C/W 2.0 C/W TBD
@ 60 C rise heat sink to ambient
(c)2006 Bel Fuse Inc.
Bel Power Inc. 155 Flanders Road, Westborough, MA 01581 * Tel 508-870-9775 * Fax 508-870-9796 * www.belpower.com page 1
POWER PRODUCTS
GMDC12V08
DORADO MV DC/DC CONVERTERS
24V Input - 12VDC - 8A Output
Input Specifications
Parameter Operating Input Voltage Input Current Input Capacitance Input Hysteresis, Low Line 6 1 Min 18 Typical 24 Max 36 4 Units VDC A F 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 Regulation Over Line, Load & Temperature Voltage Ripple Voltage Ripple, 20MHz BW Current Range Current Limit Inception 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 Over Voltage Protection, Latching 60 125 0 105 120 5 400 300 0 110 Min 97 Typical Max 103 20 60 8 Units %VNOM mV RMS mV P-P A %IOUT %VOUT S mS %VOUT %VOUT %VOUT
(c)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 2
DORADO MV DC/DC CONVERTERS
24V Input - 12VDC - 8A Output
POWER PRODUCTS
GMDC12V08
Isolation Specifications
Parameter Isolation Test Voltage, Input/Baseplate/Output (Basic) Isolation Resistance Min 2000 10 Typical Max Units VDC M
Features
Parameter Over Temperature Protection, Thermal Sensor1 Switching Frequency, Fixed 1. PCB less than 130 C. 300 Min Typical Max 117 Units
C
kHz
General Specifications
Operating Temperature Storge Temperature Relative Humidity Vibration Material Flammability Weight MTBF Telcordia (Bellcore) -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 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.
(c)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
GMDC12V08
DORADO MV DC/DC CONVERTERS
24V Input - 12VDC - 8A Output
Application Notes
CoolConverterTM
Bel Power's Proprietary CoolConverterTM * 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
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 100A. 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 100k 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 nonlatching is required, consult factory.
Output Voltage
Over Voltage Hysteresis
1.0
Output Voltage
Normalized 0 76.5
77
77.5
78
78.5
79
79.5
80
80.5
Input Voltage (V)
Under Voltage Hysteresis
1.0 Normalized 0 30
31
32
33
34
35
36
37
Input Voltage (V)
(c)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 4
DORADO MV DC/DC CONVERTERS
24V Input - 12VDC - 8A Output
POWER PRODUCTS
GMDC12V08
CoolConverterTM
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. 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. Safety An external input fuse must always be used to meet these safety requirements. External Output Trimming +Sense
Trim Up
Trim-up
RTRIM-UP
=
{
12(100+%) 1.25%
_
(100+2%) %
}
5.11k
12.0V Trim-up
10000
Trim Resistance (k)
1000
100
0
1
2
3
4
5
6
7
8
9
10
Increase in Output Voltage (%)
Trim
Trim Down
10K Trimpot Trim-down RTRIM-DOWN =
-Sense
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.
Trim Resistance (k)
{
100 _ 2 %
}
5.11k
Trim-down
1000
100
10
0
1
2
3
4
5
6
7
8
9
10
Decrease in Output Voltage (%)
(c)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
POWER PRODUCTS
GMDC12V08
DORADO MV DC/DC CONVERTERS
24V Input - 12VDC - 8A Output
Efficiency Data
Power Dissipation
Start Up
Voltage Ripple
1. VOUT 12V/div 80ms/div 2. IOUT 8A/div
1. VOUT 12mV/div 20S/div
Transient Response Line/Load Regulation
12.100
Output Voltage (V)
12.060 12.020 11.980 11.940 11.900 0 4 8
18V Vin 24V Vin 36V Vin
Output Current (A)
1. VOUT 200mV/div 1s/div 2. Enable 100mV/div
(c)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 Mechanical
GMDC12V08
POWER PRODUCTS
GMDC12V08
Pin Configuration - Bottom View
Pin 1 2 3 4 5 6 7 8 Function + Input On/Off - Input - Output - Sense Trim + Sense + Output Pin Dia. (In.) 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 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 240C.
(c)2006 Bel Fuse Inc. Specifications subject to change without notice. 11.06
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
page 7

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