Delta Electronics L36SA User manual

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.
Delphi Series L36SA, 2” x 1.6”, 50W Family
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)
Min. Typ. Max. Units
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 Across Pins 9 & 5, Pout ≦max rated power -10% 10% %
Output Voltage Remote Sense Range (option) Pout ≦max rated power 10 %
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
DS_L36SA3R315_02142007
2

ELECTRICAL CHARACTERISTICS CURVES
60
70
80
90
123456789101112131415
OUTPUT CURRENT (A)
EFFICIENCY (%)
1
2
3
4
5
6
7
8
9
123456789101112131415
OUTPUT CURRENT (A)
LOSS (W)
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.
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
INPUT VOLTAGE(V)
INPUT CURRENT(A)
Figure 3: Typical full load input characteristics at room
temperature
75Vin
18Vin
24Vin
48Vin
24Vin
18Vin
48Vin
75Vin
DS_L36SA3R315_02142007
3

ELECTRICAL 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, 1V/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, 1V/div; Bottom Trace: ON/OFF input,
5V/div
For Positive Remote On/Off Logic
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
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
0
0
0
0
0
0
00
DS_L36SA3R315_02142007
4

ELECTRICAL CHARACTERISTICS CURVES
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
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 = 1A/µs). Load cap:
330µF, 35m
Ω ESR solid electrolytic capacitor and 1µF ceramic
capacitor. Top Trace: Vout (100mV/div, 200us/div
)
, Bottom
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.
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
0 0
0
DS_L36SA3R315_02142007
5

ELECTRICAL CHARACTERISTICS CURVES
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).
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 2us/div).
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIV
E
LOAD
Figure 13: Output voltage noise and ripple measurement test
setup
0 0
DS_L36SA3R315_02142007
6

ELECTRICAL CHARACTERISTICS CURVES
output current range
0
0.5
1
1.5
2
2.5
3
3.5
0 5 10 15 20
Output current (A)
Output voltage (V)
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.
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
0
DS_L36SA3R315_02142007
7

 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.
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 Ωat 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:
DS_L36SA3R315_02142007
8

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 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(+)
Vo(-)
Sense(-)
Sense(+)
Vi(-)
ON/OFF
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% ×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 Distributio
n
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:
()
Ω−
∆
=− KdownRtrim 2.10
511
Ex. When Trim-down -10%(5V×0.9=4.5V)
()
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 )(100Vo11.5
Ex. When Trim-up +10% (5V×1.1=5.5V)
()
Ω=−−
×
+
×
×
=− KupRtrim 1682.10
10
511
101.225 )10(100511.5
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_L36SA3R315_02142007
10

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.
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: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
A
IRFLO
W
50.8
(
2.0”
)
FACING PWB PWB
AIR VELOCIT
Y
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 20: 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.
THERMAL CURVES
Figure 21: Temperature measurement location
The allowed maximum hot spot temperature is defined at 130
℃
.
L36SA3R315(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
0
2
4
6
8
10
12
14
16
30 35 40 45 50 55 60 65 70 75 80 85
Natural
Convection
200LFM
300LFM
100LFM
Output Current (A)
Ambient Temperature (℃)
400LFM
Figure 22: Output current vs. ambient temperature and air
velocity @ Vin=48V (Either Orientation)
DS_L36SA3R315_02142007
11

MECHANICAL DRAWING
OPEN FRAME VERSION
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
DS_L36SA3R315_02142007
12

DS_L36SA3R315_02142007
13
PART NUMBERING SYSTEM
L 36 S A 3R3 15 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 Advanced 3R3-3.3V 15-15A N-Negative
P-Positive
R-0.170”
F- RoHS 6/6
(Lead Free)
A-Standard
Functions
B-With sense
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
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]
Email: [email protected]
Europe:
Telephone: [phone]
Fax: [phone]
Email: [e-mail]
Asia & the rest of world:
Telephone: [phone] x6220
Fax: [phone]
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.