Delphi Series L36SA, 2” x 1.6”, 50W Family
FEATURES
High Efficiency: 88% @ 3.3V/15A
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)
Monotonic startup into normal and
pre-biased loads
2250V isolation and basic insulation
No minimum load required
4:1 Input voltage range
ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing
facility
UL/cUL 60950 (US & Canada) Recognized,
and TUV (EN60950) Certified
CE mark meets 73/23/EEC and 93/68/EEC
directives.
DC/DC Power Module: 18~75V in, 3.3V/15A 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.
OPTIONS
Positive On/Off logic
Sense
Heat spreader
APPLICATIONS
Telecom/Datacom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Testing Equipment
DATASHEET
DS_L36SA3R315_02142007
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS L36SA3R315 (Standard)
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Maximum input voltage 100 Vdc
Operating Temperature Refer to Figure21 for measuring point -40 130 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
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 40 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
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 3.267 3.3 3.333 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max ±5 ±15 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 3.25 3.35 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 40 80 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 10 20 mV
Operating Output Current Range 0 15 A
Output over current protection 110 150 %
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 80 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 80 mV
Settling Time (within 1% Vout nominal) 150 us
Turn-On Transient
Start-Up Time, From On/Off Control 20 ms
Start-Up Time, From Input 20 ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 4000 µF
EFFICIENCY
100% Load 87 %
60% Load 87 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 100 MΩ
Isolation Capacitance 1500 pF
FEATURE CHARACTERISTICS
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 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 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
Output Voltage Remote Sense Range (option)
Output Over-Voltage Protection Over full temp range; % of nominal Vout 4 V
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C 3.7 M hours Weight 24.2 Grams Over-Temperature Shutdown Refer to Figure21 for measuring point 134 °C
Min. Typ. Max. Units
Across Pins 9 & 5, Pout ≦ max rated power
Pout ≦ max rated power
-10% 10% %
10 %
DS_L36SA3R315_02142007
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ELECTRICAL CHARACTERISTICS CURVES
90
48Vin
80
24Vin
18Vin
70
EFFICIENCY (%)
60
123456789101112131415
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C
3.3
3
2.7
2.4
2.1
1.8
1.5
INPUT CURRENT(A)
1.2
0.9
0.6
0.3
0
16 21 26 31 36 41 46 51 56 61 66 71
75Vin
OUTPUT CURRENT (A)
INPUT VOLTAGE(V)
9
8
7
6
5
LOSS (W)
4
75Vin
18Vin
24Vin
3
2
1
123456789101112131415
OUTPUT CURRENT (A)
48Vin
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_L36SA3R315_02142007
3
ELECTRICAL CHARACTERISTICS CURVES
0
0
For Negative Remote On/Off Logic
0
0
Figure 4: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V.Top Trace: Vout, 1V/div; Bottom
Trace: ON/OFF input, 5V/div
For Positive Remote On/Off Logic
0
Figure 5: Turn-on transient at zero load current (5 ms/div).
Vin=48V.Top Trace: Vout, 1V/div; Bottom Trace: ON/OFF input,
5V/div
0
0
Figure 6: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V.Top Trace: Vout, 1V/div; Bottom
Trace: ON/OFF input, 5V/div
0
Figure 7: Turn-on transient at zero load current (5 ms/div).
Vin=48V.Top Trace: Vout, 1V/div, Bottom Trace: ON/OFF input,
5V/div
DS_L36SA3R315_02142007
4
ELECTRICAL CHARACTERISTICS CURVES
A
)
0
0
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, 200us/div), Bottom Trace: I out (3.75
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.
/div).
0
0
Figure 9: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 1A/µs). Load cap:
330µF, 35m
capacitor. Top Trace: Vout (100mV/div, 200us/div
Trace: I out (3.75A/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.
Ω
ESR solid electrolytic capacitor and 1µF ceramic
, Bottom
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 (L
possible battery impedance. Measure current as shown above
) of 12 µH. Capacitor Cs offset
TEST
DS_L36SA3R315_02142007
5
ELECTRICAL CHARACTERISTICS CURVES
E
0 0
Figure 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).
StripCopper
Vo(+)
SCOPE RESISTIV
10u
Vo(-)
1u
LOAD
Figure 13: Output voltage noise and ripple measurement test
setup
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load cu rrent
(20 mA/div, 2us/div).
DS_L36SA3R315_02142007
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ELECTRICAL CHARACTERISTICS CURVES
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=10A)(10 mV/div, 2us/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.
3.5
3
2.5
2
1.5
1
Output voltage (V)
0.5
0
0 5 10 15 20
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
output current range
Output current (A)
DS_L36SA3R315_02142007
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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 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
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.
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:
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 is grounded, one Vi pin and
one Vo pin shall also be 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 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.
DS_L36SA3R315_02142007
8
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 (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 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 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(+)
Sense(+)
ON/OFF
Sense(-)
Vi(-)
Vo(-)
Figure 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% × Vo ut
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 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_L36SA3R315_02142007
9
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:
511
=− KdownRtrim 2.10
∆
Ex. When Trim-down -10%(5V×0.9=4.5V)
511
10
()
Ω−
()
Ω=−=− KdownRtrim 9.402.10
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:
∆+
511
) (100 Vo11.5
=− KupRtrim 2.10
1.225
∆
−
∆
()
Ω−
Ex. When Trim-up +10% (5V×1.1=5.5V)
511
=− KupRtrim 1682.10
) 10(100 511.5
101.225
10
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.
()
Ω=−−
DS_L36SA3R315_02142007
10
THERMAL CONSIDERATIONS
A
Y
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’’).
FACING PWB
PWB
MODULE
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.
THERMAL CURVES
Figure 21: Temperature measurement location
The allowed maximum hot spot temperature is defined at 130
.
Output Current (A)
16
L36SA3R315(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
℃
14
AIR VELOCIT
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
IR FLOW
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
50.8 (2.0”)
12.7 (0.5”)
Figure 20: Wind tunnel test setup
Natural
12
Convection
10
8
6
4
2
0
30 35 40 45 50 55 60 65 70 75 80 85
100LFM
200LFM
300LFM
400LFM
Ambient Temperature (℃)
Figure 22: Output current vs. ambient temperature and air
velocity @ V
=48V (Either Orientation)
in
DS_L36SA3R315_02142007
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MECHANICAL DRAWING
DS_L36SA3R315_02142007
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 –VOUT NEGATIVE OUTPUT VOLTAGE
9 +VOUT POSITVE OUTPUT VOLTAGE
10 +SENSE (OPTION) POSITVE OUTPUT VOLTAGE SENSE
11 NC NOT CONNECTED
ALL PINS ARE COPPER WITH TIN PLATING
12
PART NUMBERING SYSTEM
L 36 S A 3R3 15 N R F A
Type of
Product
L- 2 x 1.6
Brick
Input
Voltage
18~75V S- Single Advanced 3R3-3.3V 15-15A N-Negative
Number of
Outputs
Product
Series
Output
Voltage
Output
Current
ON/OFF
Logic
P-Positive
Pin Length Option Code
R-0.170”
F- RoHS 6/6
(Lead Free)
MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 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
A-Standard
Functions
B-With sense
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_L36SA3R315_02142007
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