DATASHEET
DS_L36SA12004_08052011
FEATURES
High Efficiency: 87.5% @ 12V/4A
Size: 49.6mm x 39.4mm x 8.9mm
(1.95”x1.55”x0.35”)
Industry standard pin out
Fixed frequency operation
Input UVLO, OTP, Output OCP, OVP, (auto
recovery)
Pre-bias start up
2250V isolation and basic insulation
No minimum load required
4:1 Input voltage range
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950 (US & Canada) Recognized
APPLICATIONS
Telecom /Datacom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
OPTIONS
Positive On/Off logic
Remote Sense Pin
Delphi Series L36SA, 2 x 1.6, 50W Family
DC/DC Power Module: 18~75V in, 12V/4A out
The Delphi Series L36SA, 2” x 1.6”, 18~75V input, single output, isolated
DC/DC converter is the latest offering from a world leader in power
systems technology and manufacturing - Delta Electronics, Inc. This
L36SA series provides up to 50 watts of power or 15A of output current
(3.3V) in an industry standard 2” x 1.6” form factor and pinout. The Delphi
L36SA series operates from a wide 18~75V (4:1) input voltages. 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. An
optional heat spreader is available for extended operation.
DS_L36SA12004_08052011
2
TECHNICAL SPECIFIC ATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS L36SA 12004 (Standard)
Min. Typ. Max. Units
ABSO L UTE MAX IMUM RAT I NGS
Input Voltage
Continuous 80 Vdc
Maximum input voltage 100 Vdc
Operating Hot Spot Temperature Refer to Figure21 for measuring point -40 130 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHAR AC TE RI STIC S
Operating Input Voltage 18 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 16 17 18 Vdc
Turn-Off Voltage Threshold 15 16 17 Vdc
Lockout Hysteresis Voltage 0.75 1 1.5 Vdc
Maximum Input Current 100% Load, 18Vin 4 A
No-Load Input Current 60 mA
Off Converter Input Current 4 mA
Inrush Current(I2t) 1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 20 mA
Input Voltage Ripple Rejection 120 Hz 60 dB
OUT PUT C H AR ACTE R IS T I CS
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 11.880 12.000 12.120 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max ±5 ±10 mV
Over Line Vin=18V to 75V ±5 ±10 mV
Over Temperature Ta=-40°C to 85°C ±30 mV
Total Output Voltage Range Over sample load, line and temperature 11.82 12.18 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 50 100 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 15 30 mV
Operating Output Current Range 0 4 A
Output over current protection 110 150 %
DYNAMI C CHAR ACTE RIST IC S
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 120 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 120 mV
Settling Time (within 1% Vout nominal) 200 us
Turn-On Transient
Start-Up Time, From On/Off Control 12 ms
Start-Up Time, From Input 12 ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 470 µF
EFFICIENCY
100% Load 87.5 %
60% Load 86 %
ISOL AT ION C HARACTE RI ST I C S
Input to Output 2250 Vdc
Isolation Resistance 100 MΩ
Isolation Capacitance 1500 pF
FEATURE CHAR ACTERISTICS
Switching Frequency 300 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off at Ion/off=1.0mA 0.7 V
Logic High (Module Off) Von/off at Ion/off=0.0 µA 2.4 18 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off at Ion/off=1.0mA 0.7 V
Logic High (Module On) Von/off at Ion/off=0.0 µA 2.4 18 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 1 mA
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 50 uA
Output Voltage Trim Range Vin = 18V ~ 60V 10.44 13.56 V
(Across Pins 9 & 5, Pout ≦ max rated power) Vin = 61V ~ 75V 11.3 13.56 V
Output Voltage Remote Sense Range (option) Pout ≦ max rated power 10 %
Output Over-Voltage Protection Over full temp range; % of nominal Vout 14.4 V
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C 2.98 M hours
Weight 24.2 Grams
Over-Temperature Shutdown Refer to Figure21 for measuring point 136 °C
DS_L36SA12004_08052011
3
50
60
70
80
90
0.51 1.522.533.54
OUTPUT CURRENT ( A )
EFFICIENCY (
%
1
2
3
4
5
6
7
8
9
0.511.522.533.54
OUTPUT CURRENT ( A )
LOSS (W)
0
0. 3
0. 6
0. 9
1. 2
1. 5
1. 8
2. 1
2. 4
2. 7
3
3. 3
16 21 26 31 36 41 46 51 56 61 66 71
I NPUT VOLTAGE(V)
INPUT CU RRENT(
A
ELECTRIC AL CHARACTERISTICS CURVES
Fig ur e 1: Ef ficiency vs. load c urrent 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
75Vin
18Vin
48Vin
24Vin
18Vin
24Vin
48Vin
75Vin
DS_L36SA12004_08052011
4
ELECTRIC AL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V.Top Trace: Vout, 5V/div; Bottom
Trace: ON/OFF input, 5V/div
Figure 5: Turn-on transient at zero load current (5 ms/div).
Vin=48V.Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input,
5V/div
For Positi ve Remot e On/ O ff Logi c
Figure 6: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V.Top Trace: Vout, 5V/div; Bottom
Trace: ON/OFF input, 5V/div
Figure 7: Turn-on transient at zero load current (5 ms/div).
Vin=48V.Top Trace: Vout, 5V/div, Bottom Trace: ON/OFF input,
5V/div
DS_L36SA12004_08052011
5
ELECTRIC AL CHARACTERISTICS CURVES
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 (100mV/div,500us/div), Bottom Trace: I out (2
A
/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 (75%-50%-75% of Io, max; di/dt = 2.0A/µs). Load cap:
330µF, 35m
Ω
ESR solid electrolytic capacitor and 1µF ceramic
capacitor. Top Trace: Vout (100mV/div, 500us/div), Bottom
Trace: I out (2A/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. Me asure current as shown above
DS_L36SA12004_08052011
6
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIV
E
LOAD
ELECTRIC AL CHARACTERISTICS CURVES
Figur e 11: 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 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 2us/ d iv).
Figure 13: Output voltage noise and ripple measurement test
setup
0 0
DS_L36SA12004_08052011
7
output current range
0
1
2
3
4
5
6
7
8
9
10
11
12
13
02.55
Out put c ur r e nt ( A)
Output voltage (V)
ELECTRIC AL CHARACTERISTICS CURVES
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=4A)(20 mV/div, 2us/div)
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capa ci tor. Bandw i d t h: 20 MHz. Scope m easu remen t s sho uld 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 15: Output voltage vs. load current showing typical
curre nt limit curves and converter shutdown points.
DS_L36SA12004_08052011
8
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 normal-blow fuse with 10A
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 are
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 Ω at 100 kHz) mounted close to the
input of the module to improve the stability.
Layout and EM C Consid er ations
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
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.
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_L36SA12004_08052011
9
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 (Hiccup mode).
The modules will try to restart after shutdown. If the fault
condition still exists, the module will shut down again.
This restart trial will continue until the fault condition is
corrected.
Over-Temperature Pro tection
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 logic high.
Positive logic turns the modules on during logic high and
off during 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(+)
Vo(-)
Sense(-)
Sense(+)
Vi(-)
ON/OFF
Fi gu re 16: 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).
Vi(-)
Vi(+)
Vo(-)
Vo(+)
Sense(+)
Sense(-)
Resistance
Contact Contact and Distribution
Losses
Figure 17: 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
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.
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
DS_L36SA12004_08052011
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FEATURES DESCRIPTIONS (CON.)
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
SENSE(+) or SENSE(-). The TRIM pin should be left
open if this feature is not used.
Figure 18: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig. 18). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
()
Ω−
∆
=− KdownRtrim 2.10
511
Ex. When Trim-down -10% (12V×0.9=10.8V)
()
Ω=−=− KdownRtrim 9.402.10
10
511
Figure 19: 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. 19). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
()
Ω−
∆
−
∆
∆
+
=− KupRtrim 2.10
511
1.225 ) (100 Vo11.5
Ex. When Trim-up +10% (12V×1.1=13.2V)
()
Ω=−−
×
+
×
×
=− KupRtrim 4892.10
10
511
101.225 ) 10(100 1211.5
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.
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
DS_L36SA12004_08052011
11
THERM AL CONSIDERATI ONS
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’’).
Note: Win d Tunn el Tes t Se tup Figure D ime ns ions are in millimeters and (Inches )
12.7 (0.5”)
MODULE
A
IR FLOW
50.8
(
2.0”
)
FACING PWB PWB
A
IR VELOCIT
Y
A
ND AMBIEN
T
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 20: Wind tunnel test setup
Therma l 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.
THERMAL CURVES
Figure 21: Hot spot temperature measured point
＊ The all owed maximum hot spot temperatur e is defined at 130
℃
L36SA12004(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection
200LFM
400LFM
300LFM
100LFM
Output Current (A)
Ambient Temperature (℃)
500LFM
Figure 22: Outpu t current vs. ambient temper ature and air velocity
@Vin=48V (Either Orientation)
DS_L36SA12004_08052011
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M ECHANICAL DRAWING
PIN NO. NAME FUNCTION
1 CASE (OPTION) CASE
2 +VIN POSITIVE INPUT VOLTAGE
3 –VIN NEGATIVE INPUT VOLTAGE
4 NC NOT CONNECTED
5 ON/OFF REMOTE ON/OFF
6 TRIM OUTPUT VOLTAGE TRIM
7 –SENSE (OPTION) NEGATIVE OUTPUT VOLTAGE SENSE
8 –VO NEGATIVE OUTPUT VOLTAGE
9 +VO POSITVE OUTPUT VOLTAGE
10 +SENSE (OPTION) POSITVE OUTPUT VOLTAGE SENSE
11 NC NOT CONNECTED
ALL PINS ARE COPPER WITH TIN PLATING
OPEN FRAM E VERSION
DS_L36SA12004_08052011
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PART NUMBERING SYSTEM
L 36 S A 120 04 N R F A
Type of
Product Input
Voltage Number of
Outputs Product
Series Output
Voltage Output
Current ON/OFF
Logic Pin Length Option Code
L- 2 x 1.6
Brick
18~75V S- Single
A
dvanced 120-12.0V 04-4A N-Negative
P-Positive
R-0.170”
F- RoHS 6/6
(Lead Free)
A-Standard Functions
B-With sense
MODEL L IST
MODEL NAME INPU T OUT PU T E FF @ 100% LOAD
L36SA3R315NRFA 18V~75V 2.1A 3.3V 15A 88%
L36SA05010NRFA 18V~75V 1.9A 5V 10A 89%
L36SA12004NRFA 18V~75V 1.9A 12V 4A 87.5%
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
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
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
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.
