FEATURES
High efficiency: 92.5 % @12V/18A
Size: 57.9x36.8x10.8mm (2.28”x1.45”x0.43”)
Industry standard pin out
Fixed frequency operation
Fully protected: OTP, OVP, OCP, UVLO
No minimum load required
Wide output trim range: -20~+10%
Remote sense
Fast transient response
Basic insulation and 2250V isolation
ISO 9001, TL 9000, ISO 14001, QS9000,
UL/cUL 60950-1 (US & Canada) recognized,
CE mark meets 73/23/EEC and 93/68/EEC
(w/o heatspreader)
57.9x36.8x12.7mm (2.28”x1.45”x0.50”)
(with heatspreader)
OHSAS18001 certified manufacturing facility
TUV (EN60950-1) certified
directives
Delphi Series Q48SP, 216W Quarter Brick Family
DC/DC Power Modules: 48V in, 12V/18A out
The Delphi Series Q48SP Quarter Brick, 48V input, 12V single output,
isolated, DC/DC converters are the latest offering from a world leader in
power systems technology and manufacturing ― Delta Electronics, Inc.
This product family provides up to 216 watts of power or up to 18A of
output current in an industry standard footprint. 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.
models are fully protected from abnormal input/output voltage, current,
and temperature conditions. The Q48SP Delphi Series converters meet all
safety requirements with basic insulation.
All
OPTIONS
Latched over current protection
Positive remote on/off
Short lead lengths
APPLICATIONS
Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_Q48SP12017_05302008
1
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, V
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient (100ms, non-operating) 100ms 100 Vdc
Operating Temperature Refer to Figure 22 for the measuring point -40 120 °C
Storage Temperature
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current 100% Load, 36Vin 7 A
No-Load Input Current 140 mA
Off Converter Input Current 11 mA
Inrush Current (I2t) 1 A2S
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 10 mA
Input Voltage Ripple Rejection 120 Hz 50 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=Io.max, Ta=25C 11.8 12 12.2 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max 6 24 mV
Over Line Vin=36V to 75V 6 24 mV
Over Temperature Ta=-40C to135C 32 60 mV
Total Output Voltage Range over sample load, line and temperature 11.6 12.4 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 150 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 50 mV
Operating Output Current Range 0 18 A
Output DC Current-Limit Inception Output Voltage 10% Low 19 21 24 A
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
Positive Step Change in Output Current 50% Io,max to 75% Io,max 300 mV
Negative Step Change in Output Current 75% Io,max to 50% Io,max 300 mV
Settling Time (within 1% Vout nominal) 400 uS
Turn-On Transient
Start-Up Time, From On/Off Control 8 mS
Start-Up Time, From Input 6 mS
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 0 `1500 µF
EFFICIENCY
100% Load 92.5 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1000 pF
FEATURE CHARACTERISTICS
Switching Frequency 300 kHz
ON/OFF Control, (Logic Low-Module ON)
Logic Low Von/off at Ion/off=1.0mA 0 1 V
Logic High Von/off at Ion/off=0.0 µA 2 15 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 (not available on Exxx code) Across Pins 9 & 5, Pout <= max rated power -20 +10 %
Output Voltage Remote Sense Range (not available on Exxx) Pout <= max rated power 0.5 V
Output Over-Voltage Protection Over full temp range; % of nominal Vout 13.5 16.5 V
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C 2.40 M hours
Weight 45 grams
Over-Temperature Shutdown Refer to Figure 22 for the measuring point 130 °C
=48Vdc, nominal Vout unless otherwise noted; mounted on board.)
in
NOTES and CONDITIONS Q48SP12017NRFA
Min. Typ. Max. Units
-0.5 80 Vdc
-40 105 °C
36 48 75 Vdc
33 34 36 Vdc
30 32 34 Vdc
1 2 3 Vdc
DS_Q48SP12017_05302008
2
ELECTRICAL CHARACTERISTICS CURVES
94
92
90
88
86
84
82
80
78
EFFICIENCY(%)
76
74
72
70
24681012141618
36V 48V 75V
OUTPUT CURRENT(A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C.
20
18
16
14
12
10
8
LOSS(W)
6
4
2
0
2 4 6 8 10 12 14 16 18
36V 48V 75V
OUTPUT CURRENT(A)
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 3: Turn-on transient at zero load current. Top Trace:
Vout; 5V/div; Bottom Trace: ON/OFF input: 2V/div
DS_Q48SP12017_05302008
Figure 4: Turn-on transient at load full rated current. Top Trace:
Vout: 5V/div; Bottom Trace: ON/OFF input: 2V/div
3
ELECTRICAL CHARACTERISTICS CURVES
A
A
Figure 5: Output voltage response to step-change in load
current (50%-75% of Io, max: di/dt =0.1A/µs). Load cap:1µF
ceramic capacitor and 10uF Tantalum capacitor. Top Trace:
Vout (200mV/div), Bottom Trace: Iout (5
/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.
7.0
6.5
6.0
5.5
5.0
4.5
4.0
INPUT CURREN (A)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
30 35 40 45 50 55 60 65 70 75
Io=17A Io=10.2A Io =1.7A
INPUT VOLTAGE (V)
Figure 6: Output voltage response to step-change in load current
(75%-50% of Io, max; di/dt = 0.1A/µs). Load cap: 10uf tantalum
capacitor and 1µF ceramic capacitor. Top Trace: Vout
(200mV/div), Bottom Trace: Iout (5
/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..
14
12
10
8
OUTPUT VOLTAGE (V) )
6
4
2
Vin=48V Vin=36V Vin=75V
0
0 2 4 6 8 10 12 14 16 18
LOAD CURRENT (A)
Figure 7: Typical input characteristics at room temperature Figure 8:Output characteristics at room temperature
DS_Q48SP12017_05302008
4
ELECTRICAL CHARACTERISTICS CURVES
)
Figure 9: 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 (L
offset possible battery impedance. Measure current as
shown above.
of 12 μH. Capacitor Cs
TEST
Figure 10: Input reflected ripple current, i
source inductor at nominal input voltage and rated load current
(20 mA/div).
through a 12µH
c
DS_Q48SP12017_05302008
5
ELECTRICAL CHARACTERISTICS CURVES
E
Copper Strip
Vo(+)
10u 1u
Vo(-)
Figure 11: Output voltage noise and ripple measurement
test setup
SCOPE RESISTIV
LOAD
Figure 12: Output voltage ripple at 36V input voltage and rated
load current (50 mV/div). Load capacitance: 1µF ceramic
capacitor and 10µF tantalum capacitor. Bandwidth: 25 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.
Figure 13: Output voltage ripple at 48V input voltage and
rated load current (50 mV/div). Load capacitance: 1µF
ceramic capacitor and 10µF tantalum capacitor. Bandwidth:
25 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_Q48SP12017_05302008
Figure 14: Output voltage ripple at 75V input voltage and rated
load current (50 mV/div). Load capacitance: 1µF ceramic
capacitor and 10µF tantalum capacitor. Bandwidth: 25 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.
6
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 100 μF
electrolytic capacitor (ESR < 0.7 Ω at 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 to release.
Safety Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the enduser’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.
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.
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 20A 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.
DS_Q48SP12017_05302008
7
FEATURES DESCRIPTIONS
n
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 and latch off.
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 overvoltage set point, the module will shut down and latch
off. Cycling the input power for one second can reset
the over-voltage latch.
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 overtemperature 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 floating.
Vo(+)Vi(+)
Sense(+)
ON/OFF
Sense(-)
Vi(-)
Vo(-)
Figure 15: Remote on/off implementation
Remote Sense
(Not applicable to Q48SP120017Exxx)
Remote sense compensates for voltage drops on the
output by sensing the actual output voltage at the point
of load. The voltage between the remote sense pins
and the output terminals must not exceed the output
voltage sense range given here:
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5V
This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).
Vi(+)
Vo(+)
Sense(+)
Sense(-)
Vi(-)
Contact
Resistance
Vo(-)
Contact and Distributio
Losses
Figure 16: Effective circuit configuration for remote sense
operation
If the remote sense feature is not used to regulate the
output at the point of load, please connect SENSE(+)
to Vo(+) and SENSE(–) to Vo(–) at the module.
The output voltage can be increased by both the
remote sense and the trim; however, the maximum
allowed increase is the larger of either the remote
sense spec or the trim spec, not the sum of both.
When using remote sense and 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 does not exceed the maximum rated
power.
8
DS_Q48SP12017_05302008
FEATURES DESCRIPTIONS (CON.)
K
Output Voltage Adjustment (TRIM)
(Not applicable to Q48SP120017Exxx)
To increase or decrease the output voltage set point,
connect an external resistor between the TRIM pin
and either the SENSE(+) or SENSE(-). The TRIM pin
should be left open if this feature is not used.
Figure 17: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) pins, the output voltage set point
increases (Fig. 17). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
511
)100(11.5(
(_ Ω−
= K
upRtrim
Vo
225.1
−
=Δ
VadjVnom
100)( ×
Vnom
Vo=Nominal voltage
Ex. When trim up to 13.2V from 12V
upRtrim
=−
3.489
⇒
5000
4500
4000
3500
3000
2500
2000
1500
1000
Trim resistor value (K) )
Figure 18: Trim UP resistor selection
Ω=
500
0
12345678910
Trim-Up percentage
Δ+×
−
Δ
Δ
()
+×
10225.1
×
511
101001211.5
22.10
−−
10
Figure 19: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and SENSE (-) the output voltage set point decreases
(Fig. 19). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
()
511
=Δ k)22.10
(Rtrim_down
Δ
Ω−
Ex. When trim down to 9.6V from 12V
511
20
))(22.10
550
500
450
400
350
300
250
200
150
100
50
Trim-resistor value (K) )
0
110100
Trim-Down percentage
Figure 20: Trim DOWN resistor selection
The output voltage can be increased by both the remote
sense and the trim, however the maximum allowed
increase is the larger of either the remote sense spec or
the trim spec, not the sum of both.
When using remote sense and 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.
Ω=Ω−=− KKdownRtrim 33.1522.10
DS_Q48SP12017_05302008
9
THERMAL CONSIDERATIONS
A
Y
g
p
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.
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’’).
Thermal Derating
Heat can be removed by increasing airflow over the
module. The module’s maximum hot spot temperature
is pending to release and the measured location is
illustrated in Figure 22. 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.
THERMAL CURVES
Figure 22: Temperature measurement location
The allowed maximum hot spot temperature is defined at 120
Output Current(A)
20
18
16
14
12
10
8
6
4
2
0
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Figure 23: Output current vs. ambient temperature and air
velocity@ Vin=48V (Transverse orientation)
Q48SP12017(Standard) Output Current vs. Ambient Temperature and Air Velocity
Natural
Convection
100LFM
@Vin = 48V (Transverse Orientation)
200LFM
300LFM
600LFM
500LFM
400LFM
Ambient Temperature (℃)
℃
FACING PWB
AIR VELOCIT
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Fi
ure 21: Wind tunnel test setu
DS_Q48SP12017_05302008
PWB
MODULE
50.8 (2.0”)
IR FLOW
12.7 (0.5”)
10
MECHANICAL DRAWING (WITHOUT HEATSPERADER)
Pin No. Name Function
1
2
3
4
5
6
7
8
9
Notes:
1
2
3
DS_Q48SP12017_05302008
-Vin
CASE
ON/OFF
+Vin
+Vout
+SENSE
TRIM
-SENSE
-Vout
Pins 1-4, 6-8 are 1.00mm (0.040”) diameter
Pins 5 and 9 are 1.50mm (0.060”) diameter
All pins are copper with Tin plating
Negative input voltage
Case ground pin
Remote ON/OFF
Positive input voltage
Positive output voltage
Positive remote sense
Output voltage trim
Negative remote sense
Negative output voltage
11
Mechanical Drawing (FOR Q48SP12017Exxx)
DS_Q48SP12017_05302008
12
MECHANICAL DRAWING (WITH HEATSPREADER)
DS_Q48SP12017_05302008
13
PART NUMBERING SYSTEM
Q 48 S P 120 17 N R F A
Form
Factor
Q - Quarter
Brick
Input
Voltage
48 -
36~75V
Number of
Outputs
S - Single P - 200W
Product
Series
series
Output
Voltage
120 - 12V 18A N - Negative
Output
Current
ON/OFF
Logic
P - Positive
E - Negative and
no trim, no sense
pins
Pin
Length
R - 0.170”
N - 0.145”
K - 0.110”
Option Code
F- RoHS 6/6
(Lead Free)
Space - RoHs
5/6
A - Std. Function
with case pin
B - w/o case pin
H - With
heatspreader and
case pin
MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
Q48SP12017NRFA 36V~75V 7A 12V 18A 92.5%
Q48SP12017NRFH 36V~75V 7A 12V 18A 92.5%
Q48SP12017ERFB 36V~75V 7A 12V 18A 92.5%
Q48SP12017ERFH 36V~75V 7A 12V 18A 92.5%
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
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
Europe:
Telephone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: DCDC@delta-es.tw
.
Asia & the rest of world:
Telephone: +886 3 4526107 x6220
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
DS_Q48SP12017_05302008
14
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