TECHNICAL SPECIFICATIONS

FEATURES

High efficiency 92% @54V/1.5A

Size:
57.9x36.8x9.8mm (2.28”x1.45”x0.39”)
(w/o Heat Spreader)
57.9x36.8x12.7mm (2.28”x1.45”x0.50”)
(with Heat Spreader)

Standard footprint

Industry standard pin out

Fixed frequency operation

Input UVLO, Output OCP, OVP, OTP

2250V isolation and basic insulation

No minimum load required

ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility

UL/cUL 60950-1 (US & Canada), and TUV
(EN60950-1) - pending
Delphi Series Q48SA, 80W Quarter Brick Family
DC/DC Power Modules: 36~75V in, 54V/1.5A out
The Delphi Q48SA series quarter Brick, 36~75V input, single output,
OPTIONS

Positive, negative, or no On/Off

OTP and Output OVP, OCP mode,
isolated DC/DC converter is the latest offering from a world leader in
Auto-restart (default) or latch-up
power system and technology and manufacturing ― Delta Electronics,
Inc. This product family operates from a wide 36~75V input voltage
range and provides up to 80 watts of power in an industry standard
footprint and pinout. With creative design technology and optimization
of component placement, these converters possess outstanding
electrical and thermal performances, 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.
PRELIMINARY DATASHEET
DS_Q48SA54001_05172013
APPLICATIONS

Telecom / Datacom

Wireless Networks

Optical Network Equipment

Server and Data Storage

Industrial / Testing Equipment
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted;
PARAMETER
NOTES and CONDITIONS
Q48SA54001 (Standard)
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient (100ms)
100ms
Operating Case Temperature (Open-frame Version)
Please refer to Figure 20
Operating Case Temperature (Heat spreader Version)
Please refer to Figure 22
Storage Temperature
Input/Output Isolation Voltage
1 minute
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
No-Load Input Current
Off Converter Input Current
Vin=48V
2
Inrush Current(I t)
Input Reflected-Ripple Current
P-P thru 12µH inductor, 5Hz to 20MHz
Input Voltage Ripple Rejection
120 Hz
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Vin=48V, Io=Io.max, Tc=25°C
Output Voltage Regulation
Over Load
Io=Io,min to Io,max
Over Line
Vin=36V to 75V
Over Temperature
Tc=-40°C to 100°C
Total Output Voltage Range
over sample load, line and temperature
Output Voltage Ripple and Noise
5Hz to 20MHz bandwidth, Full load
Peak-to-Peak
(high frequency low ESR external capacitor required)
RMS
(high frequency low ESR external capacitor required)
Operating Output Current Range
Output over current protection
Hiccup mode
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
48V, 220µF electrolytic& 1µF Ceramic load cap, 0.1A/µs
Positive Step Change in Output Current
25% Io.max to 50% Io.max
Negative Step Change in Output Current
50% Io.max to 25% Io.max
Settling Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
External Output Capacitance
Full load; 5% overshoot of Vout at startup
EFFICIENCY
100% Load
Vin=48V
60% Load
Vin=48V
ISOLATION CHARACTERISTICS
Input to Output
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On)
Von/off at Ion/off=1.0mA
Logic High (Module Off)
Von/off at Ion/off=0.0 µA
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
Von/off at Ion/off=1.0mA
Logic High (Module On)
Von/off at Ion/off=0.0 µA
ON/OFF Current (for both remote on/off logic)
Ion/off at Von/off=0.0V
Leakage Current (for both remote on/off logic)
Logic High, Von/off=15V
Output Voltage Trim Range
Pout<=max rated power
Output Over-Voltage Protection (Hiccup Mode)
Over full temp range; % of nominal Vout
GENERAL SPECIFICATIONS
MTBF
Io=80% of Io, max; Tc=40°C
Weight
Over-Temperature Shutdown (Openframe Version)
Please refer to Figure 20
Over-Temperature Shutdown (Heat spreader Version)
Please refer to Figure 22
DS_Q48SA54001_05172013
Typ.
-40
-40
-55
36
48
32
29
2
Max.
Units
80
100
115
114
125
2250
Vdc
Vdc
°C
°C
°C
Vdc
75
Vdc
35
32
4
3.5
Vdc
Vdc
Vdc
A
mA
mA
2
As
mA
dB
50
8
1
10
50
52.7
53.5
54.2
Vdc
+20
+20
+802.5
+267.5
0.02
55.1
mV
mV
%Vo/°C
V
100
30
200
50
1.5
2.25
mV
mV
A
A
51.9
0
1.65
750
750
TBD
100
100
100
220
mV
mV
µs
200
200
2200
92.0
91.5
ms
ms
µF
%
%
2250
1000
Vdc
MΩ
pF
350
kHz
10
-0.7
3.5
1.2
15
V
V
0
3.5
1.2
15
1.5
85
57
100
65
V
V
mA
uA
%Vo
V
TBD
43
125
126
M hours
grams
°C
°C
2
ELECTRICAL CHARACTERISTICS CURVES
8
100
1
95
7
80
POWER DISSIPATION (W)
1
85
EFFICIENCY (%)
90
75
48Vin
36Vin
70
75Vin
65
60
6
5
4
3
75Vin
2
48Vin
1
55
36Vin
0
50
10
20
30
40
50
60
70
80
90
100
10
20
30
40
50
60
70
80
90
100
OUTPUT CURRENT(A%)
OUTPUT CURRENT(A%)
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C.
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
3.0
2.7
INPUT CURRENT (A) 1
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0.0
30
35
40
45
50
55
60
65
70
75
INPUT VOLTAGE (V)
Figure 3: Typical full load input characteristics at room
temperature.
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3
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full rated load current (20ms/div).
Top Trace: Vout; 10V/div; Bottom Trace: ON/OFF input: 5V/div.
Figure 5: Turn-on transient at zero load current (20 ms/div).
Top Trace: Vout: 10V/div; Bottom Trace: ON/OFF input:5V/div.
For Input Voltage Start up
Figure 6:Turn-on transient at full rated load current (20 ms/div).
Top Trace: Vout; 10V/div; Bottom Trace: input voltage: 50V/div.
DS_Q48SA54001_05172013
Figure 7: Turn-on transient at zero load current (20 ms/div).
Top Trace: Vout; 10V/div; Bottom Trace: input voltage: 50V/div.
4
ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Output voltage response to step-change in load
current (50%-25% of Io, max; di/dt = 0.1A/µs). Load cap: 220µF
aluminum capacitor and 1µF ceramic capacitor. TOP Trace:
Vout (200mV/div),Bottom Trace: Iout (500mA/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 9: Output voltage response to step-change in load
current (25%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
220µF aluminum capacitor and 1µF ceramic capacitor. TOP
Trace: Vout (200mV/div), Bottom Trace: Iout (500mA/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: 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.
Figure 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (200mA/div，2us/div).
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5
ELECTRICAL CHARACTERISTICS CURVES
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20mA/div，2us/div).
Figure 13: Output voltage noise and ripple measurement test
setup.
60
54
OUTPUT VOLTAGE(V) 1
48
42
36
30
24
18
12
6
0
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
LOAD CURRENT(A)
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=1.5A)(50mV/div, 2us/div)
Load capacitance: 1µF ceramic capacitor and 220µF
electrolytic
capacitor.
Bandwidth:
20MHz.
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_Q48SA54001_05172013
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
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 10μF to 100μF 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
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., UL60950-1,
CAN/CSA-C22.2, No. 60950-1 and EN60950-1+A11 and
IEC60950-1, if the system in which the power module is
to be used must meet safety agency requirements.
Basic insulation based on 75 Vdc input is provided
between the input and output of the module for the
purpose of applying insulation requirements when the
input to this DC-to-DC converter is identified as TNV-2
or SELV. An additional evaluation is needed if the
source is other than TNV-2 or SELV.
When the input source is SELV circuit, 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:
DS_Q48SA54001_05172013

The input source must be insulated from the ac
mains by reinforced or double insulation.

The input terminals of the module are not operator
accessible.

If the metal baseplate / heatspreader is grounded
the output must be also grounded.

A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the
module’s output.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to
the end-use installation, as the spacing between the
module and mounting surface have not been
evaluated.
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.
7
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).
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.
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. The default OVP operation is hiccup
mode. Under hiccup mode, the modules will try to restart
after shutdown. If the over voltage condition still exists,
the module will shut down again. This restart trial will
continue until the over-voltage condition is corrected.
Also, an optional latch-off mode for OVP is available. 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.
Figure 16: 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
Vout (-). The TRIM pin should be left open if this
feature is not used.
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.
DS_Q48SA54001_05172013
Figure 17: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and sense (-) pin, the output voltage set point increases
(Fig. 17). The external resistor vvalue required to obtain
output voltage change ∆U is defined as:
Rtrimup 
127.5
 4.7( K)
U
Ex. When Trim-up 5%，∆U is 5%*Vnormal = 0.05*53.5 =
2.675
Rtrimup 
127.5
 4.7  42.96K
2.675
8
THERMAL CONSIDERATIONS
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.
Figure 18: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and sense(+), Vout decreases (Fig. 18). The external
resistor value required to obtain output voltage change
∆U is defined as:
Rtrim down 
51 * 51
 55.7( K)
U
Ex. When Trim-down 15%，∆U is 15%*Vnormal =
0.15*53.5 = 8.025
Rtrimdown 
51 * 51
 55.7  268.4( K)
8.025
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’’).
PWB
FACING PWB
When using trim-up, 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.
MODULE
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
Thermal Derating
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.
DS_Q48SA54001_05172013
9
THERMAL CURVES
Figure 20: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125℃
Output Power(W)
Q48SA54001 (standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=48V (Transverse Orientation)
Figure 22: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 126℃
Output Power(W)
80
Q48SA54001 (standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=48V (Transverse Orientation,With Heatspreader)
80
Natural
Convection
70
70
60
Natural
Convection
60
100LFM
50
50
200LFM
40
40
30
30
20
20
10
10
100LFM
0
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 21: Output current vs. ambient temperature and air velocity Figure 23: Output current vs. ambient temperature and air velocity
@Vin=48V(Transverse Orientation, Openframe)
@Vin=48V(Transverse Orientation, With Heat spreader)
DS_Q48SA54001_05172013
10
MECHANICAL DRAWING (WITHOUT HEAT SPREADER)
Pin No.
1
2
3
4
5
6
7
8
9
Name
+Vin
ON/OFF
Case
-Vin
-Vout
-Sense
Trim
+Sense
+Vout
Function
Positive input voltage
Remote ON/OFF
Optional
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
Pin Specification:
Pins 1-4,6-8
Pins 5 & 9
1.00mm (0.040”) diameter
2. 1.50mm (0.059”) diameter
All pins are copper with Tin plating.
DS_Q48SA54001_05172013
11
MECHANICAL DRAWING (WITH HEAT SPREADER)
DS_Q48SA54001_05172013
12
PART NUMBERING SYSTEM
Q
48
S
A
540
01
N
N
Form
Input
Number of
Product
Output
Output
ON/OFF
Pin
Factor
Voltage
Outputs
Series
Voltage
Current
Logic
Length
S - Single
A - Advanced
540 - 54V
01- 1.5A
Q - Quarter
Brick
48 36~75V
NNegative
F
H
Option Code
R - 0.170” Space- RoHs 5/6 H - with Heatspreader
F- RoHS 6/6
N - 0.145”
(Lead Free)
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
Q48SA54001NNFH
36V~75V
3.5 A
54V
1.5A
92%
Q48SA54001NN H
36V~75V
3.5 A
54V
1.5A
92%
* Standard OCP, OVP, OTP operations are auto-restart or hiccup.
CONTACT: www.deltaww.com/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: [email protected]
Europe:
Phone: +31-20-655-0967
Fax: +31-20-655-0999
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107
ext 6220~6224
Fax: +886 3 4513485
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.
DS_Q48SA54001_05172013
13