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”)
Š
Š
Š
Š
Š
Š
Š
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.
Š
Positive On/Off logic
Š
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
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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 Ω 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
Email: [email protected]
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
Email: [email protected]
Email: [email protected]
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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