Delta Electronics Power Supply Series Q48DR User Manual

FEATURES  
High Efficiency: 88%@ 1.8V/15A, 3.3V/15A  
Standard footprint:57.9mmx36.8mmx8.5mm  
(2.28”×1.45”×0.33”)  
Industry standard pin out  
2:1 input voltage range  
Fixed frequency operation  
Fully protected: OTP, OCP, OVP, UVLO  
No minimum load required  
1500 V isolation and basic insulation  
Two independent power train and separate  
trim for each output  
ISO 9001, TL 9000, ISO 14001, QS9000,  
OHSAS18001 certified manufacturing  
facility  
UL/cUL 60950 (US & Canada) Recognized,  
and TUV (EN60950) Certified  
CE mark meets 73/23/EEC and 93/68/EEC  
directives  
Delphi Series Q48DR, 87W-100W, Quarter Brick  
Dual Output, DC/DC Power Modules:  
48V in, 1.8V and 3.3V, 15A out each channel  
OPTIONS  
Optional second trim pin for  
The Delphi Series Q48DR Quarter Brick Dual, 48V input, dual output,  
isolated DC/DC converters are latest offering from one of the world’s  
largest power supply manufacturers — Delta Electronics, Inc. This  
product family provides up to 100 watts of power or 15A of output current  
(each channel simultaneously) in an industry standard footprint. Both  
output channels can be used independently of each other with option to  
trim each channel either in the same direction or in reversion direction.  
With creative design technology and optimized circuit, these converters  
possess outstanding electrical and thermal performance, as well as  
extremely high reliability under highly stressful operating conditions. All  
the models are fully protected from abnormal input/output voltage,  
current, and temperature conditions. The Delphi Series converters meet  
all safety requirements with basic insulation.  
independent trim of the two outputs  
Positive On/Off logic  
Short pin lengths available  
APPLICATIONS  
Telecom/DataCom  
Wireless Networks  
Optical Network Equipment  
Server and Data Storage  
Industrial/Test Equipment  
DATASHEET  
DS_Q48DR1R833_03162007  
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ELECTRICAL CHARACTERISTICS CURVES  
Figure 1: Efficiency vs. load current Iout1 for minimum,  
Figure 2: Efficiency vs. load current Iout2 for minimum,  
nominal, and maximum input voltage at 25°C, for Iout2=7.5A.  
nominal, and maximum input voltage at 25°C, for Iout1=7.5A  
Figure 3: Efficiency vs. load current Iout1 and Iout2 for  
minimum, nominal, and maximum input voltage at 25°C, for  
Iout1=Iout2  
Figure 4: Power dissipation vs. load current for minimum,  
nominal, and maximum input voltage at 25°C. for Iout1=Iout2  
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DS_Q48DR1R833_03162007  
ELECTRICAL CHARACTERISTICS CURVES  
Vout2  
Vout1  
Vout2  
Vout1  
Figure 5: Turn-on transient at zero load current(2ms/div).  
Vin=48V. Negative logic turn on. Top Trace: Vout; 1V/div;  
Bottom Trace: ON/OFF input: 5V/div  
Figure 6: Turn-on transient at full rated load current (resistive  
load) (2 ms/div). Vin=48V. Negative logic turn on. Top Trace:  
Vout; 1V/div; Bottom Trace: ON/OFF input: 5V/div  
Vout2  
Vout1  
Vout2  
Vout1  
Figure 7: Turn-on transient at zero load current (2ms/div).  
Vin=48V. Positive logic turns on. Top Trace: Vout; 1V/div;  
Bottom Trace: ON/OFF input: 5V/div  
Figure 8: Turn-on transient at full load current (2ms/div).  
Vin=48V. Positive logic turns on. Top Trace: Vout; 1V/div;  
Bottom Trace: ON/OFF input: 5V/div  
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DS_Q48DR1R833_03162007  
ELECTRICAL CHARACTERISTICS CURVES  
Ch1  
Ch1  
Ch1  
Ch2  
Ch2  
Ch2  
Ch3  
Ch3  
Ch4  
Ch3  
Ch4  
Ch4  
6
Figure 9: Output voltage response to step-change in load  
Figure 10: Output voltage response to step-change in load  
current Iout2 (75%-50%-75% of Io, max; di/dt = 2.5A/µs) at  
current Iout1 (75%-50%-75% of Io, max; di/dt = 2.5A/µs) at  
Iout1=7.5A. Load cap: 470µF, 35mESR solid electrolytic  
Iout2=7.5A. Load cap: 470µF, 35mESR solid electrolytic  
capacitor and 1µF ceramic capacitor. Ch1=Vout2  
(100mV/div), Ch2=Iout2 (7.5A/div), Ch3=Vout1 (100mV/div),  
Ch4=Iout1 (7.5A/div) Scope measurement should be made  
using a BNC cable (length shorter than 20 inches). Position  
the load between 51 mm to 76 mm (2 inches to 3 inches)  
from the module.  
capacitor and 1µF ceramic capacitor. Ch1=Vout2 (100mV/div),  
Ch2=Iout2 (7.5A/div), Ch3=Vout1 (100mV/div), Ch4=Iout1  
(7.5A/div) Scope measurement should be made using a BNC  
cable (length shorter than 20 inches). Position the load between  
51 mm to 76 mm (2 inches to 3 inches) from the module.  
Ch1  
Ch1  
Ch1  
Ch2  
Ch2  
Ch2  
Ch3  
Ch3  
Ch4  
Ch3  
Ch4  
Ch4  
Figure 11: Output voltage response to step-change in load  
Figure 12: Test set-up diagram showing measurement points for  
current Iout2 and Iout1 (75%-50%-75% of Io, max; di/dt =  
Input Terminal Ripple Current and Input Reflected Ripple  
Current.  
2.5A/µs). Load cap: 470µF, 35mESR solid electrolytic  
Note: Measured input reflected-ripple current with a simulated  
capacitor and 1µF ceramic capacitor. Ch1=Vout2  
source Inductance (LTEST) of 12 µH. Capacitor Cs offset possible  
(100mV/div), Ch2=Iout2 (7.5A/div), Ch3=Vout1 (100mV/div),  
battery impedance. Measure current as shown above  
Ch4=Iout1 (7.5A/div) Scope measurement should be made  
using a BNC cable (length shorter than 20 inches). Position  
the load between 51 mm to 76 mm (2 inches to 3 inches)  
from the module.  
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DS_Q48DR1R833_03162007  
ELECTRICAL CHARACTERISTICS CURVES  
Figure 13: Input Terminal Ripple Current-ic, at full rated  
Figure 14: Input reflected ripple current-is, through a 12µH  
source inductor at nominal input voltage and rated load current  
(20 mA/div, 2us/div).  
output current and nominal input voltage with 12µH source  
impedance and 33µF electrolytic capacitor (500 mA/div,  
2us/div).  
CopperStrip  
Vo(+)  
SCOPE RESISTIV  
10u  
1u  
LOAD  
Vo(-)  
Figure 15: Output voltage noise and ripple measurement  
test setup  
Figure 16: Output voltage ripple at nominal input voltage and  
rated load current (Iout1=Iout2=15A)(20 mV/div, 1us/div). Top  
trace: Vout2(20mV/div), Bottom trace(20mV/div)  
Load capacitance: 1µF ceramic capacitor and 10µF tantalum  
capacitor. Bandwidth: 20 MHz. Scope measurements should be  
made using a BNC cable (length shorter than 20 inches). Position  
the load between 51 mm to 76 mm (2 inches to 3 inches) from  
the module.  
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DS_Q48DR1R833_03162007  
ELECTRICAL CHARACTERISTICS CURVES  
Figure 17: Output voltage vs. load current Iout1 showing  
typical current limit curves and converter shutdown points.  
Figure 18: Output voltage vs. load current Iout2 showing typical  
current limit curves and converter shutdown points.  
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DS_Q48DR1R833_03162007  
DESIGN CONSIDERATIONS  
Input Source Impedance  
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.  
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:  
The input source must be insulated from any  
hazardous voltages, including the ac mains, with  
reinforced insulation.  
One Vi pin and one Vo pin are grounded, or all the  
input and output pins are kept floating.  
The input terminals of the module are not operator  
accessible.  
If the metal baseplate is grounded the output must  
be also grounded.  
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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DS_Q48DR1R833_03162007  
FEATURES DESCRIPTIONS  
Over-Current Protection  
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).  
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.  
Figure 19: Remote on/off implementation  
Over-Voltage Protection  
Output Voltage Adjustment (TRIM)  
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.  
To increase or decrease the output voltage set point,  
the modules may be connected with an external  
resistor between the TRIM pin and either Vout1(+) or  
RTN. The TRIM pin should be left open if this feature  
is not used.  
The module will try to restart after shutdown. If the over-  
voltage condition still exists during restart, the module  
will shut down again. This restart trial will continue until  
the output voltage is within specification.  
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.  
Figure 20: Circuit configuration for trim-down (decrease  
output voltage)  
Remote On/Off  
If the external resistor is connected between the TRIM  
and Vout1(+) pin, the output voltage set point  
decreases (Fig. 20). The external resistor value is  
from the table below.  
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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DS_Q48DR1R833_03162007  
FEATURES DESCRIPTIONS (CON.)  
Figure 21: Circuit configuration for trim-up (increase output  
voltage)  
If the external resistor is connected between the TRIM  
and RTN, the output voltage set point increases (Fig.  
21). The external resistor value is from table below.  
Trim Resistor  
(Vout Increase)  
Δ [%] Rtrim-up [KΩ]  
Trim Resistor  
(Vout Decrease)  
Rtrim-down [KΩ]  
Δ [%]  
1
2
57.4  
25.5  
14.9  
9.57  
6.38  
4.26  
2.47  
1.60  
709  
0
1
2
70.2  
31.2  
18.2  
11.7  
7.80  
5.20  
3.34  
1.95  
867  
0
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10  
10  
The output voltage can be increased by the trim pin,  
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. Care should  
be taken to ensure that the maximum output power of  
the module remains at or below the maximum rated  
power.  
10  
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DS_Q48DR1R833_03162007  
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 23: Hot spot temperature measured point  
The allowed maximum hot spot temperature is defined at  
114℃  
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’’).  
Q48DR1R833(Standard) Output Load vs. Ambient Temperature and Air Velocity  
Output Load(%)  
@ Vin = 48V (Transverse Orientation)  
110%  
600LFM  
500LFM  
100%  
90%  
80%  
70%  
60%  
50%  
40%  
30%  
20%  
10%  
0%  
Natural  
Convection  
Thermal Derating  
100LFM  
Heat can be removed by increasing airflow over the  
module. The module’s hottest spot is less than +114°C.  
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.  
200LFM  
300LFM  
400LFM  
65  
20  
25  
30  
35  
40  
45  
50  
55  
60  
70  
75  
80  
85  
Ambient Temperature (  
)
Figure 24: Output load vs. ambient temperature and air velocity  
@Vin=48V(Transverse Orientation)  
PWB  
MODULE  
FACING PWB  
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 (Inche  
Figure 22: Wind tunnel test setup  
11  
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DS_Q48DR1R833_03162007  
MECHANICAL DRAWING  
Pin No. Name  
Function  
1
2
3
4
5
6
7
8
-Vin  
Negative input voltage  
Remote ON/OFF  
ON/OFF  
+Vin  
+Vout2  
TRIM  
Output RTN  
+Vout1  
Optional  
Positive input voltage  
Positive output voltage2  
Output voltage trim  
Positive output voltage1  
TRIM2  
Notes:  
Pins 1-8 are 1.00mm (0.040”) diameter  
All pins are copper with Tin plating.  
1
2
12  
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DS_Q48DR1R833_03162007  
PART NUMBERING SYSTEM  
Q
48  
D
R
1R8  
33  
N
R
F
A
Form Factor Input  
Number of  
Product  
Output  
Output  
ON/OFF Pin Length  
Option Code  
Voltage  
Outputs  
Series  
Voltage 1 Voltage 2  
Logic  
Q – Quarter  
Brick  
48 - 36-75V D-Dual Output R-Open frame 2R5-2.5V  
33-3.3V N-Negative  
R-0.170”  
(Default)  
N-0.145”  
K-0.110”  
A - Standard  
Functions  
(Default)  
B - with second  
trim pin  
F- RoHS 6/6  
(Lead Free)  
3R3-3.3V  
1R8-1.8V  
1R5-1.5V  
50-5.0V  
(Default)  
P-Positive  
MODEL LIST  
MODEL NAME  
Q48DR1R533NRFA  
Q48DR1R833NRFA  
Q48DR2R533NRFA  
Q48DR3R350NRFA  
INPUT  
EFF @ Full Load  
OUTPUT *  
36V~75V  
36V~75V  
36V~75V  
36V~75V  
2.8A  
2.9A  
3.3A  
3.8A  
1.5V/15A  
3.3V/15A  
87.5%  
88.0%  
88.0%  
88.5%  
1.8V/15A  
2.5V/15A  
3.3V/15A  
3.3V/15A  
3.3V/15A  
5.0V/10A  
USA:  
Asia & the rest of world:  
Telephone: +886 3 4526107 ext 6220  
Fax: +886 3 4513485  
Europe:  
Phone: +41 31 998 53 11  
Fax: +41 31 998 53 53  
Telephone:  
East Coast: (888) 335 8201  
West Coast: (888) 335 8208  
Fax: (978) 656 3964  
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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DS_Q48DR1R833_03162007  

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