Delta Electronics Delphi Q48DR User manual

DATASHEET
DS_Q48DR1R833_03162007
Delphi Series Q48DR, 87W-100W, Quarter Brick
Dual Output, DC/DC Power Modules:
48V in, 1.8V and 3.3V, 15A out each channel
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.
APPLICATIONS
 Telecom/DataCom
 Wireless Networks
 Optical Network Equipment
 Server and Data Storage
 Industrial/Test Equipment
OPTIONS
 Optional second trim pin for
independent trim of the two outputs
 Positive On/Off logic
 Short pin lengths available
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
1

DS_Q48DR1R833_03162007
TECHNICAL SPECIFICATIONS (TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS Q48DR1R833NRFA
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient (100ms) <100ms 100 Vdc
Operating Temperature Please refer to figure 27 for measuring point -40 114 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 1500 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 48 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 33 34 35 Vdc
Turn-Off Voltage Threshold 31 32 33 Vdc
Lockout Hysteresis Voltage 1 2 3 Vdc
Maximum Input Current 100%load, 36Vin 2.9 A
No-Load Input Current 100 150 mA
Off Converter Input Current 5 10 mA
Inrush Current(I2t) 0.015 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 10 mA
Input Voltage Ripple Rejection 120Hz 50 dB
OUTPUT CHARACTERISTICS
Vout 1 1.771 1.800 1.829
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25 ℃Vout 2 3.247 3.300 3.353 Vdc
Output Voltage Regulation
Io1=Io, min to Io, max, Io2=0A Vout 1
Over Load Io2=Io, min to Io, max, Io1=0A Vout 2 ±5 ±10 mV
Vout 1
Over Line Vin=36V to 75V,Io1=Io2=full load Vout 2 ±3 ±10 V
Cross Regulation Worse Case ±5 ±10 mV
Over Temperature Tc=-40 ℃to 85 ℃±15 ±50
Vout 1 1.746 1.854 V
Total Output Voltage Range Over sample load, line and temperature Vout 2 3.201 3.399 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Vout 1 40 80
Peak-to-Peak Io1, Io2 Full Load, 1µF ceramic, 10µF tantalum Vout 2 40 80 mV
Vout 1 10 30
RMS Io1, Io2 Full Load, 1µF ceramic, 10µF tantalum Vout 2 10 30 mV
Vout 1 0 15
Operating Output Current Range Vout 2 0 15 A
Vout 1 100% 150%
Output DC Current-Limit Inception Vout 2 100% 150%
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
Vout 1 100
Positive Step Change in Output Current Iout1from 50% Io, max to 75% Io, max Vout 2 100 mV
Vout 1 100
Negative Step Change in Output Current Iout2 from 75% Io, max to 50% Io, max Vout 2 100 mV
Cross dynamic Each channel independence 20 mV
Settling Time (within 1% Vout nominal) 150 US
Turn-On Transient
Start-up Time, From On/Off Control 10 15 MS
Start-up Time, From Input 10 15 mS
Vout 1 10000
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup Vout 2 10000 µF
EFFICIENCY
100% Load Iout1, Iout2 full load, 48vdc Vin 88 %
60% Load Iout1, Iout2 60% of full load, 48vdc Vin 88 %
ISOLATION CHARACTERISTICS
Input to Output 1500 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 3000 pF
FEATURE CHARACTERISTICS
Switching Frequency 350 kHz
ON/OFF Control, (Logic Low-Module ON)
Logic Low Von/off at Ion/off=1.0mA 0 0.8 V
Logic High Von/off at Ion/off=0.0 µA 18 V
ON/OFF Current Ion/off at Von/off=0.0V 1 mA
Leakage Current Logic High, Von/off=15V 50 uA
Output Voltage Trim Range Pout ≦max rated power -10 +10 %
Output Over-Voltage Protection Over full temp range; %of nominal Vout 115 122 130 %
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C,300FLM 3.0 M hours
Weight 26.5 grams
Over-Temperature Shutdown Please refer to figure 27 for measuring point 122 °C
2

ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current Iout1 for minimum,
nominal, and maximum input voltage at 25°C, for Iout2=7.5A. Figure 2: Efficiency vs. load current Iout2 for minimum, 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
3
DS_Q48DR1R833_03162007

DS_Q48DR1R833_03162007
4
ELECTRICAL CHARACTERISTICS CURVES
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
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
Vout2
Vout1
Vout2
Vout1
Vout2
Vout1
Vout2
Vout1

DS_Q48DR1R833_03162007
5
ELECTRICAL CHARACTERISTICS CURVES
F
te
igure 9: Typical full load input characteristics at room
mperature
I
F
cu
o
ca
C
m
th mm (2
inches to 3 inches) from the module.
igure 10: Output voltage response to step-change in load
rrent Iout2 (75%-50%-75% of Io, max; di/dt = 0.1A/µs) at
ut1=7.5A. Load cap: 10µF, tantalum capacitor and 1µF ceramic
pacitor. Ch1=Vout2 (100mV/div), Ch2=Iout2 (7.5A/div),
h3=Vout1 (100mV/div), Ch4=Iout1 (7.5A/div) Scope
easurement should be made using a BNC cable (length shorter
an 20 inches). Position the load between 51 mm to 76
F
c
Io
c
(
S
(l n 20 inches). Position the load between
51 mm to 76 mm (2 inches to 3 inches) from the module.
igure 11: Output voltage response to step-change in load
urrent Iout1 (75%-50%-75% of Io, max; di/dt = 0.1A/µs) at
ut2=7.5A. Load cap: 10µF, tantalum capacitor and 1µF
eramic capacitor. Ch1=Vout2 (100mV/div), Ch2=Iout2
7.5A/div), Ch3=Vout1 (100mV/div), Ch4=Iout1 (7.5A/div)
cope measurement should be made using a BNC cable
ength shorter tha
c F : Output voltage response to step-change in load
u
0.
ca 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.
igure 12
rrent Iout2 and Iout1 (75%-50%-75% of Io, max; di/dt =
1A/µs). Load cap: 10µF, tantalum capacitor and 1µF ceramic
pacitor. Ch1=Vout2 (100mV/div), Ch2=Iout2 (
ELECTRICAL CHARACTERISTICS CURVES
6
Figure 9: Output voltage response to step-change in load
current Iout2 (75%-50%-75% of Io, max; di/dt = 2.5A/µs) at
Iout1=7.5A. Load cap: 470µF, 35m
Ω ESR 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.
Figure 10: Output voltage response to step-change in load
current Iout1 (75%-50%-75% of Io, max; di/dt = 2.5A/µs) at
Iout2=7.5A. Load cap: 470µF, 35m
Ω ESR 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.
Figure 11: Output voltage response to step-change in load
current Iout2 and Iout1 (75%-50%-75% of Io, max; di/dt =
2.5A/µs). Load cap: 470µF, 35m
Ω ESR 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.
Figure 12: Test set-up diagram showing measurement points for
Input Terminal Ripple Current and Input Reflected Ripple
Current.
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
Ch4
Ch3
Ch2
Ch1
Ch3
Ch2
Ch1
Ch4
Ch3
Ch2
Ch1
Ch4
Ch3
Ch2
Ch1
Ch4
Ch3
Ch2
Ch1
Ch4
Ch3
Ch4
Ch2
Ch1

DS_Q48DR1R833_03162007
6
ELECTRICAL CHARACTERISTICS CURVES
Figure 13: Input Terminal Ripple Current-ic, at full rated
output current and nominal input voltage with 12µH source
impedance and 33µF electrolytic capacitor (500 mA/div,
2us/div).
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).
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTI
V
LOAD
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.

DS_Q48DR1R833_03162007
7
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.

DS_Q48DR1R833_03162007
8
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 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.
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.
DESIGN CONSIDERATIONS
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 Ωat 100 kHz)
mounted close to the input of the module to improve the
stability.
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.
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.

DS_Q48DR1R833_03162007
9
Figure 19: Remote on/off implementation
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 Vout1(+) or
RTN. The TRIM pin should be left open if this feature
is not used.
Figure 20: Circuit configuration for trim-down (decrease
output voltage)
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.
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.
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.
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.
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.

DS_Q48DR1R833_03162007
10
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.
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.
Trim Resistor
(Vout Increase)
Δ[%] Rtrim-up [KΩ]
1 57.4
2 25.5
3 14.9
4 9.57
5 6.38
6 4.26
7 2.47
8 1.60
9 709
10 0
Trim Resistor
(Vout Decrease)
Δ[%] Rtrim-down [KΩ]
1 70.2
2 31.2
3 18.2
4 11.7
5 7.80
6 5.20
7 3.34
8 1.95
9 867
10 0