Delta Electronics Power Supply Q48DC User Manual

FEATURES  
Š
High efficiency: 88%@ ±12.1V/2.7A  
Š
Size: 57.9mm x 36.8mm x 9.7mm  
(2.28”×1.45”×0.38”)  
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Industry standard pin out  
Fixed frequency operation  
Input UVLO, Output OCP, OVP, OTP  
2250V isolation  
No minimum load required  
Adjustable output voltage  
ISO 9001, TL 9000, ISO 14001, QS9000,  
OHSAS18001 certified manufacturing  
facility  
Š
UL/cUL 60950-1 (US & Canada), and TUV  
(EN60950-1) - pending  
Delphi Series Q48DC, 65W Quarter Brick Dual Output  
DC/DC Power Modules: 48V in, ±12.1V, 2.7A Output  
OPTIONS  
The Delphi Series Q48DC second generation Quarter Brick, 48V  
input, positive and negative bipolar dual output, and isolated DC/DC  
converters are the latest offering from a world leader in power system  
and technology and manufacturing Delta Electronics, Inc. The  
Q48DC product family is the second generation in the bipolar dual  
output series and it provides even more cost effective solution of  
positive and negative bipolar output (output voltage is 12.1V) and up  
to 65 watts of power in an industry standard quarter brick package  
size. Both output channels can be used independently. With creative  
design technology and optimization of component placement, these  
converters possess outstanding electrical and thermal performance,  
as well as extremely high reliability under highly stressful operating  
conditions. All models are fully protected from abnormal input/output  
voltage, current, and temperature conditions. The Delphi Series  
converters meet all safety requirements with basic insulation.  
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Positive On/Off logic  
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Output OVP hiccup available  
APPLICATIONS  
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Telecom / DataCom  
Wireless Networks  
Optical Network Equipment  
Server and Data Storage  
Industrial / Test Equipment  
PRELIMINARY DATASHEET  
DS_ Q48DC12003_03112008  
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ELECTRICAL CHARACTERISTICS CURVES  
10.2  
9.4  
8.6  
7.8  
7.0  
6.2  
5.4  
4.6  
3.8  
3.0  
90  
87  
84  
81  
78  
75  
72  
69  
66  
63  
60  
75Vin  
48Vin  
36Vin  
36Vin  
48Vin  
75Vin  
1.1  
0.3  
0.7  
1.1  
1.5  
1.9  
2.3  
2.7  
0.3  
0.7  
1.5  
1.9  
2.3  
2.7  
OUTPUT CURRENT(A)  
OUTPUT CURRENT(A)  
Figure 1: Efficiency vs. load current for minimum, nominal, and  
Figure 2: Power dissipation vs. load current for minimum,  
maximum input voltage at 25°C. Io1=Io2.  
nominal, and maximum input voltage at 25°C. Io1=Io2.  
2.5  
2.3  
2.1  
1.9  
1.7  
1.5  
1.3  
1.1  
0.9  
0.7  
0.5  
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
INPUT V OLTA GE (V )  
Figure 3: Typical input characteristics at room temperature  
(Io=full load).  
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ELECTRICAL CHARACTERISTICS CURVES  
Figure 5: Turn-on transient at full rated load current (resistive  
load) (10 ms/div). Vin=48V. Top Trace: Vout; 5V/div; Bottom  
Trace: ON/OFF input: 5V/div.  
Figure 4: Turn-on transient at zero load current (10ms/div).  
Vin=48V. Top Trace: Vout: 5V/div; Bottom Trace: ON/OFF input:  
5V/div.  
Figure 7: Turn-on transient at full rated load current (resistive  
load) (10 ms/div). Vin=48V. Top Trace: Vout; 5V/div; Bottom  
Trace: Vin input: 50V/div.  
Figure 6: Turn-on transient at zero load current (10ms/div).  
Vin=48V. Top Trace: Vout: 5V/div; Bottom Trace: Vin input:  
50V/div.  
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ELECTRICAL CHARACTERISTICS CURVES  
Figure 9: Output voltage response to step-change in load  
current Iout2 (75%-50%-75% of Io, max; di/dt = 0.1A/µs,  
200uS/DIV). Vin=48V. Load cap: 10µF, tantalum capacitor and  
1µF ceramic capacitor. Top trace: Vout (100mV/div), Bottom  
trace: Iout (1A/div). Scope measurement should be made using  
a BNC cable (length short than 20 inch). Position the load  
between 51 mm and 76 mm (2inch and 3 inch) from the module.  
Figure 8: Output voltage response to step-change in load  
current Iout1 (75%-50%-75% of Io, max; di/dt = 0.1A/µs,  
200uS/DIV)). Vin=48V. Load cap: 10µF, tantalum capacitor  
and 1µF ceramic capacitor. Top trace: Vout (100mV/div),  
Bottom trace: Iout (1A/div). Scope measurement should be  
made using a BNC cable (length short than 20 inch). Position  
the load between 51 mm and 76 mm (2inch and 3 inch) from  
the module.  
D
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ELECTRICAL CHARACTERISTICS CURVES  
Figure 11: Input Terminal Ripple Current, i , at full rated output  
current and nominal input voltage with 12µH source impedance  
and 33µF electrolytic capacitor (500 mA/div).  
Figure 10: Test set-up diagram showing measurement points  
for Input Terminal Ripple Current and Input Reflected Ripple  
Current.  
c
Note: Measured input reflected-ripple current with a simulated  
source Inductance (LTEST) of 12 μH. Capacitor Cs offset  
possible battery impedance. Measure current as shown above.  
Figure 12: Input reflected ripple current, i , through a 12µH  
s
source inductor at nominal input voltage and rated load current  
(20 mA/div).  
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ELECTRICAL CHARACTERISTICS CURVES  
CopperStrip  
Vo(+)  
SCOPE RESISTIV  
10u  
1u  
LOAD  
Vo(-)  
Figure 13: Output voltage noise and ripple measurement  
test setup.  
Figure 14: Output voltage ripple at nominal input voltage  
(Vin=48V) and rated load current (Io1=Io2=2.7A,20 mV/div). Load  
capacitance: 1µF ceramic capacitor and 10µF tantalum capacitor.  
Bandwidth: 20 MHz. (See Figure 13). Scope measurement should  
be made using a BNC cable (length short than 20 inch). Position  
the load between 51 mm and 76 mm (2inch and 3 inch) from the  
module.  
13  
12  
11  
10  
9
8
7
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
8
9
LOAD CURRENT(A)  
Figure 15: Output voltage vs. load current showing typical  
current limit curves and converter shutdown points.  
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DESIGN CONSIDERATIONS  
Do not ground one of the input pins without grounding  
one of the output pins. This connection may allow a  
non-SELV voltage to appear between the output pin and  
ground.  
Input Source Impedance  
The impedance of the input source connecting to the  
DC/DC power modules will interact with the modules  
and affect the stability. A low ac-impedance input source  
is recommended. If the source inductance is more than  
a few μH, we advise adding a 10 to 100 μF electrolytic  
capacitor (ESR < 0.7 at 100 kHz) mounted close to  
the input of the module to improve the stability.  
The power module has extra-low voltage (ELV) outputs  
when all inputs are ELV.  
This power module is not internally fused. To achieve  
optimum safety and system protection, an input line fuse  
is highly recommended. The safety agencies require a  
normal-blow fuse with 7A maximum rating to be installed  
in the ungrounded lead. A lower rated fuse can be used  
based on the maximum inrush transient energy and  
maximum input current.  
Layout and EMC Considerations  
Delta’s DC/DC power modules are designed to operate  
in a wide variety of systems and applications. For design  
assistance with EMC compliance and related PWB  
layout issues, please contact Delta’s technical support  
team. An external input filter module is available for  
easier EMC compliance design. Application notes to  
assist designers in addressing these issues are pending  
release.  
Soldering and Cleaning Considerations  
Post solder cleaning is usually the final board assembly  
process before the board or system undergoes electrical  
testing. Inadequate cleaning and/or drying may lower the  
reliability of a power module and severely affect the  
finished circuit board assembly test. Adequate cleaning  
and/or drying is especially important for un-encapsulated  
and/or open frame type power modules. For assistance  
on appropriate soldering and cleaning procedures,  
please contact Delta’s technical support team.  
Safety Considerations  
The power module must be installed in compliance with  
the spacing and separation requirements of the  
end-user’s safety agency standard, i.e., UL60950,  
CAN/CSA-C22.2 No. 60950-00 and EN60950:2000 and  
IEC60950-1999, if the system in which the power  
module is to be used must meet safety agency  
requirements.  
When the input source is 60 Vdc or below, the power  
module meets SELV (safety extra-low voltage)  
requirements. If the input source is a hazardous voltage  
which is greater than 60 Vdc and less than or equal to 75  
Vdc, for the module’s output to meet SELV requirements,  
all of the following must be met:  
Š
The input source must be insulate from any  
hazardous voltage, including the ac mains, with  
reinforced insulation.  
Š
One Vi pin and one Vo pin are grounder, or all the  
input and output pins are kept floating.  
Š
Š
The input terminals of the module are not operator  
accessible.  
If the metal baseplate is grounded the output must  
be also grounded.  
Š
A SELV reliability test is conducted on the system  
where the module is used to ensure that under a  
single fault, hazardous voltage does not appear at  
the module’s output.  
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FEATURES DESCRIPTIONS  
Over-Current Protection  
Vi(+)  
Vo(+)  
The modules include an internal output over-current  
protection circuit, which will endure current limiting for  
an unlimited duration during output overload. If the  
output current exceeds the OCP set point, the modules  
will automatically shut down (hiccup mode).  
Trim  
Rtn  
ON/OFF  
The modules will try to restart after shutdown. If the  
overload condition still exists, the module will shut down  
again. This restart trial will continue until the overload  
condition is corrected.  
Vo(-)  
Vi(-)  
Figure 16: Remote on/off implementation  
Over-Voltage Protection  
The modules include an internal output over-voltage  
protection circuit, which monitors the voltage on the  
output terminals. If this voltage exceeds the over-voltage  
set point, the module will shut down and latch off. The  
over-voltage latch is reset by either cycling the input  
power or by toggling the on/off signal for one second.  
Over-Temperature Protection  
The over-temperature protection consists of circuitry  
that provides protection from thermal damage. If the  
temperature exceeds the over-temperature threshold  
the module will shut down.  
The module will try to restart after shutdown. If the  
over-temperature condition still exists during restart, the  
module will shut down again. This restart trial will  
continue until the temperature is within specification.  
Remote On/Off  
The remote on/off feature on the module can be either  
negative or positive logic. Negative logic turns the  
module on during a logic low and off during a logic high.  
Positive logic turns the modules on during a logic high  
and off during a logic low.  
Remote on/off can be controlled by an external switch  
between the on/off terminal and the Vi(-) terminal. The  
switch can be an open collector or open drain.  
For negative logic if the remote on/off feature is not  
used, please short the on/off pin to Vi(-). For positive  
logic if the remote on/off feature is not used, please  
leave the on/off pin to floating.  
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FEATURES DESCRIPTIONS (CON.)  
If the external resistor is connected between the TRIM and  
Rtn the output voltage set point increases (Fig.18). The  
external resistor value required to obtain a percentage  
output voltage change % is defined as:  
Output Voltage Adjustment (TRIM)  
To increase or decrease the output voltage set point,  
the modules may be connected with an external  
resistor between the TRIM pin and either the Vo(+) or  
Vo(-). The TRIM pin should be left open if this feature  
is not used.  
197  
Rtrim up =  
(KΩ)  
Δ
Ex. When Trim-up +5%(12 .1V×1.05=12.71V)  
197  
Vo(+)  
Rtrim up =  
= 39.4  
(
KΩ  
)
5
Rtrim-down  
When using trim, the output voltage of the module is usually  
increased, which increases the power output of the module  
with the same output current.  
Trim  
Rtn  
Care should be taken to ensure that the maximum output  
power of the module remains at or below the maximum rated  
power.  
Vo(-)  
Figure 17: Circuit configuration for trim-down (decrease  
output voltage)  
If the external resistor is connected between the TRIM  
and Vo(+) pins, the output voltage set point decreases  
(Fig.17). The external resistor value required to obtain  
a percentage of output voltage change % is defined  
as:  
749  
Rtrim down =  
9.46 (KΩ)  
Δ
Ex. When Trim-down -25%(12.1V×0.75=9.08V)  
749  
25  
Rtrim down =  
9.46 (KΩ) = 20.5(KΩ)  
Vo(+)  
Trim  
Rtn  
Rtrim-up  
Vo(-)  
Figure 18: Circuit configuration for trim-up (increase output  
voltage)  
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THERMAL CONSIDERATIONS  
THERMAL CURVES  
Thermal management is an important part of the system  
design. To ensure proper, reliable operation, sufficient  
cooling of the power module is needed over the entire  
temperature range of the module. Convection cooling is  
usually the dominant mode of heat transfer.  
Hence, the choice of equipment to characterize the thermal  
performance of the power module is a wind tunnel.  
Thermal Testing Setup  
Delta’s DC/DC power modules are characterized in heated  
vertical wind tunnels that simulate the thermal  
environments encountered in most electronics equipment.  
This type of equipment commonly uses vertically mounted  
circuit cards in cabinet racks in which the power modules  
are mounted.  
Figure 20: Temperature measurement location  
* The allowed maximum hot spot temperature is defined at 124℃  
Q48DC12003(Standard) Output Current vs. Ambient Temperature and Air Velocity  
Output Current(A)  
@Vin = 48V (Transverse Orientation)  
The following figure shows the wind tunnel characterization  
setup. The power module is mounted on a test PWB and is  
vertically positioned within the wind tunnel. The space  
between the neighboring PWB and the top of the power  
module is constantly kept at 6.35mm (0.25’’).  
3.0  
2.5  
Natural  
Convection  
2.0  
100LFM  
1.5  
Thermal Derating  
200LFM  
1.0  
0.5  
0.0  
Heat can be removed by increasing airflow over the  
module.To enhance system reliability, the power module  
should always be operated below the maximum operating  
temperature. If the temperature exceeds the maximum  
module temperature, reliability of the unit may be affected.  
25  
30  
35  
40  
45  
50  
55  
60  
65  
70  
75  
80  
85  
Ambient Temperature ()  
PWB  
MODULE  
FACING PWB  
Figure 21: Output current vs. ambient temperature and air velocity  
@Vin = 48V(Transverse Orientation)  
AIR VELOCITY  
AND AMBIENT  
TEMPERATURE  
MEASURED BELOW  
THE MODULE  
50.8 (2.0”)  
AIR FLOW  
12.7 (0.5”)  
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)  
Figure 19: Wind Tunnel Test Setup  
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MECHANICAL DRAWING  
Pin No. Name  
Function  
1
2
3
4
5
6
7
+Vin  
ON/OFF  
-Vin  
-Vout  
GND  
Trim  
Positive input voltage  
Remote ON/OFF  
Negative input voltage  
Negative output voltage  
Ground  
Output voltage trim  
Positive output voltage  
+Vout  
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PART NUMBERING SYSTEM  
Q
48  
D
C
120  
03  
N
R
F
A
Product  
Type  
Q - Quarter  
Input  
Voltage  
48V  
Number of  
Outputs  
D - Dual  
Product  
Series  
C - 2nd  
generation of  
bipolar dual  
output  
Output  
Voltage  
120 - 12.1V  
Output  
Current  
ON/OFF  
Logic  
Pin  
Length  
Option Code  
03 - 2.7A N - Negative R - 0.150”  
A - Standard  
Functions  
F- RoHS 6/6  
(Lead Free)  
Brick  
Output  
P - Positive  
MODEL LIST  
MODEL NAME  
INPUT  
OUTPUT  
EFF @ 100% LOAD  
±12.1V  
Q48DC12003NR A  
36V~75V  
2.4A  
2.7A  
88%  
USA:  
Telephone:  
East Coast: (888) 335 8201  
West Coast: (888) 335 8208  
Fax: (978) 656 3964  
Europe:  
Phone: +41 31 998 53 11  
Fax: +41 31 998 53 53  
Asia & the rest of world:  
Telephone: +886 3 4526107 ext 6220  
Fax: +886 3 4513485  
WARRANTY  
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon  
request from Delta.  
Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its  
use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted  
by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications  
at any time, without notice.  
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