DELTA V48SC12008NRFA

FEATURES

High efficiency: 92.0% @ 12V/8.3A

Size:

Without heat spreader:

33.0x22.8x9.5mm (1.30”x0.90”x0.37”)

With heat spreader

33.0x22.8x12.7mm (1.30”x0.90”x0.50”)

Industry standard footprint and pinout

Fixed frequency operation

SMD or through-hole versions

Input UVLO

OTP and output OCP, OVP

Output voltage trim: -20%, +10%

Monotonic startup into normal and
pre-biased loads

1500V isolation and basic insulation

No minimum load required

No negative current during power or
enable on/off

ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS18001 certified manufacturing
Delphi Series V48SC, 1/16th Brick 100W
DC/DC Power Modules: 48V in, 12V, 8.3A out
The Delphi Series V48SC, 1/16
th
Brick, 48V input, 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 100 watts of power or 30A of
th
output current in the 1/16 brick form factor (1.3”x0.90”) and pinout.
facility

UL/cUL 60950-1 (US & Canada)
OPTIONS

SMD pins

Short pin lengths available

Positive remote On/Off

Open frame with heat-spreader
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. Typical efficiency of the 12V/8.3A
module is greater than 92.0%. All modules are protected from
abnormal input/output voltage, current, and temperature conditions.
For lower power needs, but in a similar small form factor, please check
APPLICATIONS
out Delta V36SE (50W), S48SP (36W or 10A) and S36SE (17W or 5A)

Optical Transport
series standard DC/DC modules.

Data Networking

Communications

Servers
DS_V48SC12008_04222013
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
NOTES and CONDITIONS
V48SC12008 (Standard)
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient (100ms)
Operating Ambient Temperature
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
2
Inrush Current (I t)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output Over Current Protection
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Delay Time, From On/Off Control or Input
Start-Up Rise Time, From On/Off Control or Input
Maximum Output Capacitance
EFFICIENCY
100% Load
60% Load
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)
Logic High (Module Off)
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
Logic High (Module On)
ON/OFF Current (for both remote on/off logic)
ON/OFF Current (for both remote on/off logic)
Leakage Current (for both remote on/off logic)
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection
GENERAL SPECIFICATIONS
MTBF
Weight
weight
100ms
-40
-55
Max.
Units
80
100
85
125
1500
Vdc
Vdc
°C
°C
Vdc
36
48
75
Vdc
32.5
29.5
1.5
34.5
31.5
3
35.5
33.5
4
4
12
Vdc
Vdc
Vdc
A
mA
mA
With 100uF external input capacitor
1
As
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
20
mA
dB
12
12.18
Vdc
±5
±5
±180
±12
±12
mV
mV
mV
V
100% Load, 36Vin
60
8
Vin=48V, Io=Io.max, Tc=25°C
Io=Io, min to Io, max
Vin=36V to 75V
Tc=-40°C to125°C
Over sample load, line and temperature
5Hz to 20MHz bandwidth
max load on output, 20MHz bandwidth
10uF tantalum + 1uF ceramic capacitor
max load on output, 20MHz bandwidth
10uF tantalum + 1uF ceramic capacitor
Output Voltage 10% Low
-60
11.82
11.64
From On/Off Control or Input to 10%Vo
From 10%Vo to 90% Vo
Full load; 5% overshoot of Vout at startup;
12.36
100
mV
8.3
140
300
300
200
Vin=48V
Vin=48V
92.0
92.0
1500
Von/off
Von/off
Ion/off at Von/off=0.0V
Ion/off at Von/off=2.4V
Logic High, Von/off=5V
Max rated current guaranteed at full trim range
Max rated current guaranteed at full remote sense
range
Over full temp range; % of nominal Vout
Per Telecordia SR-332, 80% load, 25°C, 48Vin,
300LFM
Open frame
ms
ms
µF
%
%
1000
Vdc
MΩ
pF
420
kHz
10
Von/off
Von/off
A
%
mV
mV
us
15
40
3300
0
2
mV
30
0
110
load capacitor10uF tantalum + 1u ceramic 0.1A/uS
Frequency= 250Hz
50% Io.max to 75% Io.max
75% Io.max to 50% Io.max
With heat-spreader
Refer to Figure 22 for Hot spot location
Over-Temperature Shutdown (Hot Spot)
(48Vin,80%Io, 200LFM,Airflow from Vout+ to Vin+)
Over-Temperature Shutdown (NTC Resistor)
Refer to Figure 22 for NTC resistor location
Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spot’s temperature is just for reference.
DS_V48SC12008_04222013
Typ.
0
2.4
0.7
5
V
V
0
2.4
0.7
5
1
-20
10
V
V
mA
uA
uA
%
10
%
110
140
%
4.9
M hours
15
grams
24
grams
132
°C
125
°C
2
ELECTRICAL CHARACTERISTICS CURVES
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.
Figure 3: Typical full load input characteristics at room
temperature
DS_V48SC12008_04222013
3
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Start up
Figure 4: Turn-on transient at full rated load current (10
ms/div). Vin=48V. Top Trace: Vout, 5.0V/div; Bottom Trace:
ON/OFF input, 5V/div
Figure 5: Turn-on transient at zero load current (10 ms/div).
Vin=48V. Top Trace: Vout: 5.0V/div, Bottom Trace: ON/OFF
input, 5V/div
For Input Voltage Start up
Figure 6: Turn-on transient at full rated load current (10
ms/div). Vin=48V. Top Trace: Vout, 5.0V/div; Bottom Trace: Vin,
50V/div
Figure 7: Turn-on transient at zero load current (10 ms/div).
Vin=48V. Top Trace: Vout, 5.0V/div; Bottom Trace: Vin, 50V/div
Figure 8: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (0.15V/div, 200us/div), Bottom Trace: Iout (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
DS_V48SC12008_04222013
4
ELECTRICAL CHARACTERISTICS CURVES
is
ic
Vin+
+
+
Vin-
Cs: 220uF
100uF,
ESR=0.2 ohm @
25oC 100KHz
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 (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown above
Figure 10: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (200 mA/div, 1us/div)
Copper
Strip
Vo(+)
10u
1u
SCOPE
RESISTIVE
LOAD
Vo(-)
Figure 11: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 2us/div)
Figure 12: Output voltage noise and ripple measurement test
setup
Figure 13: Output voltage ripple at nominal input voltage and
rated load current (Io=7.5A)(50 mV/div, 1us/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_V48SC12008_04222013
5
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. Below is the reference design for an
input filter tested with V48SC120XXX to meet EN55022
(VDE0878) class A(both q. peak and average)
Figure 15 - EMI test negative line
Schematic and Components List
Figure 16 - EMI test positive line
Safety Considerations
Figure 14 - EMI test schematic
C1= 3.3uF/100 V
C2= 47uF/100 V
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,
CSA C22.2 NO. 60950-1 2nd and IEC 60950-1 2nd :
2005 and EN 60950-1 2nd: 2006+A11+A1: 2010, if the
system in which the power module is to be used must
meet safety agency requirements.
C3= 47uF/100 V
C4=C5=1nF/250Volt
T1=1mH, type P53910(Pulse)
Test Result:
At T = +25C , Vin = 48 V and full load.
Yellow line is quasi peak mode; Blue line is average mode.
DS_V48SC12008_04222013
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:
6

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.

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
Fast-acting 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.
For hiccup mode, the module 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.
For latch mode, the module will latch off once it
shutdown. The 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, and enter in auto-restart mode or
latch mode, which is optional, the default is auto-restart
mode.
For auto-restart mode, the module will monitor the
module temperature after shutdown. Once the
temperature is dropped and within the specification, the
module will be auto-restart.
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.
Vi(+)
Sense(+)
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 enter hiccup mode or latch
mode, which is optional, the default is hiccup mode.
For hiccup mode, the module will try to restart after
shutdown. If the over current condition still exists, the
module will shut down again. This restart trial will continue
until the over-current 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, and enter in hiccup
mode or latch mode, which is optional, the default is
hiccup mode.
DS_V48SC12008_04222013
Vo(+)
ON/OFF
Sense(-)
Vi(-)
Vo(-)
Figure 17: Remote on/off implementation
Remote Sense
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(–)] ≤ 10% × Vout
This limit includes any increase in voltage due to remote
sense compensation and output voltage set point
adjustment (trim).
7
FEATURES DESCRIPTIONS (CON.)
Vi(+)
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig. 19). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Vo(+)
Sense(+)
 511

Rtrim  down  
 10.22 K 


Sense(-)
Vi(-)
Vo(-)
Contact
Resistance
Contact and Distribution
Losses
Figure 18: Effective circuit configuration for remote sense
operation
Ex. When Trim-down -10% (12V×0.9=10.8V)
 511

Rtrim  down  
 10.22 K   40.88K 
 10

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
increase is the larger of either the remote sense or the
trim, 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.
Max rated current is guaranteed at full output voltage
remote sense range.
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
connect an external resistor between the TRIM pin and
SENSE(+) or SENSE(-). The TRIM pin should be left
open if this feature is not used.
Figure 20: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases
(Fig. 20). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
Rtrim  up 
5.11Vo (100   ) 511

 10.22K 
1.225

Ex. When Trim-up +10% (12V×1.1=13.2V)
Rtrim  up 
5.11  12  (100  10) 511

 10.22  489.31K 
1.225  10
10
Trim resistor can also be connected to Vo+ or Vo- but it
would introduce a small error voltage than the desired
value.
Figure 19: Circuit configuration for trim-down (decrease
output voltage)
The output voltage can be increased by both the remote
sense and the trim, however the maximum increase is
the larger of either the remote sense or the trim, 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.
DS_V48SC12008_04222013
Max rated current is guaranteed at full output voltage
8
trim range.
THERMAL CONSIDERATIONS
Thermal Derating
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.
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.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
THERMAL CURVES
HOT SPOT
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’’).
AIRFLOW
NTC RESISTOR
Figure 22: * Hot spot& NTC resistor temperature measurement
location. The allowed maximum hot spot temperature is defined at
120℃
V48SC12008(Standard) Output Power vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
Output Power (W)
PWB
FANCING PWB
100
90
Natural
Convection
MODULE
80
100LFM
70
60
200LFM
50
300LFM
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
50.8(2.00")
40
AIR FLOW
400LFM
30
20
500LFM
600LFM
10
0
25
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 23: Output Power vs. Ambient Temperature and Air
Velocity @ Vin=48V (Either Orientation)
Figure 21: Wind tunnel test setup
DS_V48SC12008_04222013
9
PICK AND PLACE LOCATION
RECOMMENDED PAD LAYOUT (SMD)
SURFACE-MOUNT TAPE & REEL
DS_V48SC12008_04222013
10
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Note: The temperature refers to the pin of V48SC, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
Temp.
Peak Temp. 240 ~ 245 ℃
217℃
Ramp down
max. 4℃/sec.
200℃
150℃
Preheat time
100~140 sec.
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
25℃
Time
Note: The temperature refers to the pin of V48SC, measured on the pin +Vout joint.
DS_V48SC12008_04222013
11
MECHANICAL DRAWING
Surface-mount module
DS_V48SC12008_04222013
Through-hole module
12
Through-hole module with heat spreader
For modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly onto system
boards; please do not subject such modules through reflow temperature profile.
All pins are copper alloy with Matte tin over Ni plated.
DS_V48SC12008_04222013
13
DS_V48SC12008_04222013
14
PART NUMBERING SYSTEM
V
48
Type of
Product
V - 1/16
Brick
S
Input Number of
Voltage Outputs
4836V~75V
S - Single
C
120
08
N
R
F
Product
Series
Output
Voltage
Output
Current
ON/OFF
Logic
Pin
Length/Type
C-Serial
number
120 – 12V
08 – 8.3A
N- Negative
P- Positive
R - 0.170”
N - 0.145”
K - 0.110”
M – SMD
A
Option Code
A - Standard Functions
F- RoHS 6/6
H – With heat spreader
(Lead Free)
Space- RoHS5/6
MODEL LIST
MODEL NAME
V48SC12008NRFA
INPUT
36~75V
OUTPUT
4A
12V
EFF @ 100% LOAD
8.3A
92%
Default remote on/off logic is negative and pin length is 0.170”
For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales office.
CONTACT: www.deltaww.com/dcdc
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
Europe:
Phone: +31 (0)20 655 09 67
Fax: +31 (0)20 655 09 99
Email: DCDC@delta-es.com
Asia & the rest of world:
Telephone: +886 3 4526107
Ext 6220~6224
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
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_V48SC12008_04222013
15