SMT or Through-Hole, 3.3V and 5V
15Watt, DC/DC Converters
Dual Output
Mixed Voltage, DSM/DWR Models
Features
Figure 1. Simplifi ed Schematic
INNOVATION and EX C ELL E N C E
Regulated 5V and 3.3V outputs
5V @ 2.65Amps/3.3V @ 3 Amps capability
15 Watts total output power
1" x 2" SMT or through-hole package
Available input voltage ranges:
10-18V, 18-36V or 36-75V
No-load stable operation
UL1950 and EN60950 safety approvals
mark available (75V-input models)
Continuous short-circuit protection
Fully isolated, 1500Vdc guaranteed
40 to +100C operating temperature
Input under and overvoltage shutdown
Output OVP, thermal shutdown
DATEL, Inc., Mansfi eld, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email: sales@datel.com Internet: www.datel.com
For surface mount or through-hole applications requiring 15 Watts of power from
5V and 3.3V, DATEL offers a new power sharing DC/DC converter capable of
meeting your output current requirements. The DSM/DWR series is available with
three different input voltage ranges: 36-75V input (D48), 18-36V input (D24) or
10-18V input (D12). These converters are fully isolated and capable of delivering
any combination of 5V and 3.3V output current up to a combined total of 15 Watts
of output power.
Housed in 1" x 2" metal packages coated with electrically non-conductive fi nish,
DSM/DWR converters are regulated by a 3.3V control loop that provides load
regulation of 0.5% for 3.3V output and 1.5% for 5V output.
All models include input fi ltering, input overvoltage and undervoltage shutdown
circuitry, output short-circuit and current-limiting protection, and thermal shutdown.
All models provide trim capability and an on/off control function. Fully synchronous
output rectifi cation provides high effi ciency (86%) and a stable output under no-load
conditions.
DSM/DWR power sharing modules offer low output ripple and noise perfor-
mance, 1500 Vdc isolation voltage, and are fully specifi ed for 40 to +100C
operation. These devices meet IEC950, UL1950 and EN6950 safety standards;
CB reports are available on request. "D48" models are CE marked (meets LVD
requirements).
+INPUT
(1)
INPUT
(2)
SWITCH
CONTROL
+5V OUTPUT
(5)
+3.3V OUTPUT
(8)
OUTPUT
RETURN
(7)
TRIM
(9)
PWM
CONTROLLER
REFERENCE &
ERROR AMP
OPTO
ISOLATION
ON/OFF
CONTROL
(3)
UV & OV
COMPARATORS
THERMAL
SHUTDOWN
1 5 W , D U A L O U T P U T , M I X E D - V O L T A G E D C / D C C O N V E R T E R S
XWR Series
Performance Specifi cations and Ordering Guide
P A R T N U M B E R S T R U C T U R E
V
1
Nominal Output Voltage:
5 Volts
5
DSM
2.65
-
/
D48
-
Input Voltage Range:
D12 = 10-18 Volts (12V nominal)
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
I
1
Maximum Output Current:
2.65 Amps
Dual Output:
DSM: Surface-Mount Series
(Selective soldering only)
DWR: Through-Hole Series
3.3
3
/
-
V
2
Nominal Output Voltage:
3.3 Volts
I
2
Maximum Output Current:
3 Amps
Typical at T
A
= +25C under nominal line voltage and balanced "full-load" conditions (5V @ 1.5A/3.3V @ 2.25A).
Any combination of 5V/3.3V rated I
OUT
current, not to exceed 15 Watts of output power. (See derating graphs.)
Ripple/Noise (R/N) measured over a 20MHz bandwidth. All models are specifi ed with 0.47F ceramic
in parallel with 100F tantalum output capacitors.
Output
Input
Tested from 250mA to 100% full load (other output at 250mA load).
Nominal line voltage, no load/balanced full-power condition.
2
M E C H A N I C A L S P E C I FI C A T I O N S
METAL CASE
2.00
(50.80)
0.20 MIN
(5.08)
0.45
(11.43)
1
2
3
4
9
8
7
6
5
1.800
(45.72)
0.10
(2.54)
0.10
(2.54)
0.300
(7.62)
BOTTOM VIEW
0.200
(5.08)
1.00
(25.40)
0.800 (20.32)
4 EQ. SP. @
0.200 (10.16)
0.040 0.001 DIA.
(1.016 0.025)
INSULATED PAD
2.00
(50.80)
4
3
2
1
8
7
6
5
9
0.10
(2.54)
0.110
(2.79)
0.100
(2.54)
0.300
(7.62)
0.500
(12.70)
TOP VIEW
1.00
(25.40)
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
0.060
(1.52)
0.055
(1.40)
0.015
(0.38)
0.110
(2.79)
0.015
(0.38)
INSULATED BASE
METAL CASE
0.52
(13.21)
DIMENSIONS ARE IN INCHES (MM)
Case C18A
DSM Models
I/O
Connections
Pin Function
P36
1 +Input
2
Input
3 On/Off
Control
4
Case
5
+5V
Output
6
NC
7 Output
Return
8 +3.3V
Output
9
Trim
R/N (mVp-p)
Regulation (Max.)
Effi ciency
Package
V
OUT
I
OUT
V
IN
Nom.
Range
I
IN
(Case,
Model
(Volts) (Amps) Typ.
Max. Line
Load
(Volts) (Volts) (mA) Min. Typ. Pinout)
DSM-5/2.65-3.3/3-D12 5 2.65 40 75 1%
1.5%
12 10-18 60/1450 84% 86%
C18A, P36
DWR-5/2.65-3.3/3-D12 3.3 3 60 100 0.5%
0.5% C34, P36
DSM-5/2.65-3.3/3-D24 5 2.65 40 75 1%
1.5%
24 18-36 35/730 83% 86%
C18A, P36
DWR-5/2.65-3.3/3-D24 3.3 3 60 100 0.5%
0.5% C34, P36
DSM-5/2.65-3.3/3-D48 5 2.65 40 75 1%
1.5%
48 36-75 20/370 83% 86%
C18A, P36
DWR-5/2.65-3.3/3-D48 3.3 3 60 100 0.5%
0.5% C34, P36
Optional Functions
DSM/DWR 15 Watt DC/DC's are designed with an On/Off Control
function, with positive polarity in the pin 3 position.
Blank On/Off Control function (positive polarity) on pin 3
L1 Pin length: 0.110 inches (2.79mm) 0.010
L2 Pin length: 0.145 inches (3.68mm) 0.010
See Optional Functions
LX
Case C34
DWR Models
DSM/DWR Models
1 5 W , D U A L O U T P U T , M I X E D - V O L T A G E D C / D C C O N V E R T E R S
Performance/Functional Specifi cations
Typical @ T
A
= +25C under nominal line voltage, balanced "full-load" conditions, unless noted.
Input
Input Voltage Range:
D12 Models 10-18 Volts (12V nominal)
D24 Models 18-36 Volts (24V nominal)
D48 Models 36-75 Volts (48V nominal)
Overvoltage Shutdown:
D12 Models 18.5-21 Volts (19V typical)
D24 Models 37-40 Volts (38.5V typical)
D48 Models 77-81 Volts (79.5V typical)
Start-Up Threshold:
D12 Models 9.4-10 Volts (9.6V typical)
D24 Models 16.5-18 Volts (17V typical)
D48 Models 34-36 Volts (35V typical)
Undervoltage Shutdown:
D12 Models 7.0-8.5 Volts (8V typical)
D24 Models 15.5-17.5 Volts (16.5V typical)
D48 Models 32.5-35.5 Volts (33.5V typical)
Input Current:
Normal Operating Conditions See Ordering Guide
Standby Mode:
Off, OV, UV, Thermal Shutdown 10mA
Input Refl ected Ripple Current
10mAp-p
Internal Input Filter: Capacitive
D12 Models 10F
D24 Models 3.3F
D48 Models 1.5F
Reverse-Polarity Protection:
D12 Models 1 minute duration, 3A maximum
D24 Models 1 minute duration, 2A maximum
D48 Models 1 minute duration, 1A maximum
On/Off Control: (Pin 3):
On = open or 13V to +V
IN
,
I
IN
@ 13V = 800A
Off = 0 to 0.8V, I
IN
@ 0V = 2mA
Output
V
OUT
Accuracy:
5V Output 2.5% maximum
3.3V Output 1.5% maximum
Minimum Loading Per Specifi cation
250mA
Minimum Load For Stability No load
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide / Effi ciency Curves
Cross Regulation:
5V Output
(5V@1.5A, 3.3V@0.25-2.25A) 2%
3.3V Output
(3.3V@2.25A, 5V@0.25-1.5A) 0.5%
Trim Range
5%
Isolation Voltage:
Input-to-Output 1500Vdc minimum
Input-to-Case 1000Vdc minimum
Output-to-Case 1000Vdc minimum
Isolation Capacitance 560pF
Isolation Resistance 100M
Current Limit Inception:
5V @ 95% V
OUT
(3.3V @ 0.25A) 4.7-5.7 Amps
3.3V @ 97% V
OUT
(5V @ 0.25A) 3.3-4 Amps
Output (continued)
Short Circuit Current:
5V Output 5.5 Amps average, continuous current
3.3V Output 3 Amps average, continuous current
Maximum Capacitive Loading 330F per output
Temperature Coeffi cient 0.02% per C
Dynamic Characteristics
Dynamic Load Response:
5V (50-100% step to 98% V
OUT
) 200sec maximum (3.3V @ 0.25A)
3.3V (50-100% step to 98.5% V
OUT
) 200sec maximum (5V @ 0.25A)
Start-Up Time:
V
IN
to V
OUT
100msec maximum
On/Off to V
OUT
50msec maximum
Switching Frequency 260kHz (25kHz)
Environmental
MTBF:
D12 Models
TBD hours
D24 Models
TBD hours
D48 Models
TBD hours
Operating Temperature: (Ambient):
Without Derating: +60C
With Derating
To +100C (See Derating Curves)
Case Temperature:
Maximum Operational +100C
For Thermal Shutdown 101C minimum, 115C maximum
Storage Temperature 40 to +120C
Physical
Dimensions
See Mechanical Specifi cations
Internal Case Connection Case connection via pin 4
Case Material
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel fi nish and plastic baseplate
Pin Material
Brass, solder coated, surface-mount leads
Weight
1.6 ounces (46 grams)
Primary to Secondary Insulation Level Operational
Balanced "full-load" is 5V @ 1.5A/3.3V @ 2.25A. All models are specifi ed with external
0.47F ceramic and 100F tantalum output capacitors.
See Technical Notes/Graphs for details.
Applying a voltage to On/Off Control (pin 3) when no input power is applied to the
converter can cause permanent damage.
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
On/Off control is designed to be driven with open collector or by appropriate voltage
levels. Voltages must be referenced to the Input (Pin 2).
Demonstrated MTBF available on request.
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade.
Input Ripple Current is tested/specifi ed over a 5-20MHz bandwidth with an external 22F
input capacitor and a simulated source impedance of 220F and 12H. See I/O Filtering,
Input Ripple Current and Output Noise for details.
3
1 5 W , D U A L O U T P U T , M I X E D - V O L T A G E D C / D C C O N V E R T E R S
XWR Series
4
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12 Models 21 Volts
D24 Models 40 Volts
D48 Models 81 Volts
Transient (100msec): D12 Models 25 Volts
D24 Models 50 Volts
D48 Models 100 Volts
Input Reverse-Polarity Protection:
Input Current must be limited. 1 minute
duration. Fusing recommended.
D12 Models
3 Amps
D24 Models
2 Amps
D48 Models
1 Amps
Output Current
Current limited. Devices can withstand
an indefi nite output short circuit.
On/Off Control (Pin 3) Max. Voltages:
Referenced to Input (pin 2) +V
IN
Storage Temperature
40 to +120C
Lead Temperature (Soldering, 10 sec.) +300C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifi cations Table is not implied, nor recommended.
T E C H N I C A L N O T E S
Isolation / Case Connection
The XWR Series' 5V and 3.3V outputs (pins 5 & 8) with its common return
(pin 7) are isolated from the +V
IN
and V
IN
inputs (pins 1 & 2) via a
transformer and an opto-coupled transistor.
The DC/DC converter's case is internally connected to pin 4. This allows
circuit specifi c grounding of the case on either the input or the output side, or
leaving the case disconnected, i.e. "fl oating."
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of a sustained, non-current-limited, input-voltage polar-
ity reversal exists. For XWR 15 Watt Series Converters, it is recommended
to install slow blow fuses with values no greater than the following, in the
+Input line.
V
IN
Range
Fuse Value
D12 Models
3 Amps
D24 Models
2 Amps
D48 Models
1 Amps
Input Reverse-Polarity Protection
Upon applying a reverse-polarity voltage to the DC/DC converter, an internal
diode will be forward biased, drawing excessive current from the power
source. Therefore, it is required that the input current be limited by either an
appropriately rated input fuse or a current limited power source.
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until
the ramping-up input voltage exceeds the Start-Up Threshold Voltage (35V
for D48 models). Once operating, devices will not turn off until the input
voltage drops below the Undervoltage Shutdown limit (34V for D48 models).
Subsequent re-start will not occur until the input is brought back up to
the Start-Up Threshold. This built in hysteresis prevents any unstable on/off
situations from occurring at a single input voltage.
Input voltages exceeding the input overvoltage shutdown specifi cation listed
in the Performance/Functional Specifi cations will cause the device to shut-
down. A built-in hysteresis of 0.6 to 1.6 Volts for all models will not allow the
converter to restart until the input voltage is suffi ciently reduced.
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval of time where the input voltage
crosses the turn-on threshold point, and the fully loaded output voltage enters
and remains within its specifi ed accuracy band. Actual measured times will
vary with input source impedance, external input/output capacitance, and the
slew rate of the input voltages. The XWR 15 Watt Series implements a soft
start circuit that limits the duty cycle of the PWM controller at power up,
thereby limiting the Input Inrush current.
The On/Off Control to V
OUT
start-up time assumes the converter has its
nominal input voltage applied but is turned off via the On/Off Control pin.
The specifi cation defi nes the interval between the time at which the converter
is turned on and the fully loaded output voltage enters and remains within
its specifi ed accuracy band. Similar to the V
IN
to V
OUT
start-up, the On/Off
Control to V
OUT
start-up time is also governed by the internal soft start
circuitry and external load capacitance.
On/Off Control
The On/Off Control (pin 3) may be used for remote on/off operation. As
shown in Figure 1, the control pin is referenced to the Input (pin 2) and will
be internally pulled to a high state. The XWR Series is designed so that it is
enabled when the control pin is left open (pulled high) and disabled when the
control pin is pulled low (less than +0.8V relative to Input).
Dynamic control of the on/off function is best accomplished with a mechanical
relay or an open-collector/open-drain circuit (optically isolated if appropriate).
The drive circuit should be able to sink approximately 1 mA for logic low.
The on/off control function is designed such that the converter can be
disabled while the input power is ramping up, and then "released" once the
input has stabilized.
3
2
1
+INPUT
13V CIRCUIT
5V CIRCUIT
INPUT
ON/OFF
CONTROL
Figure 1. Internal On/Off Control circuitry
DSM/DWR Models
1 5 W , D U A L O U T P U T , M I X E D - V O L T A G E D C / D C C O N V E R T E R S
Trimming Output Voltages
The DSM/DWR converters have a trim capability (pin 9) that allow users to
adjust the output voltages 5%. A trim adjustment will cause an equal percent-
age of change in both outputs. Adjustments to the output voltages can be
accomplished via a trim pot, Figure 3, or a single fi xed resistor as shown in
Figures 4 and 5. A single fi xed resistor can increase or decrease the output
voltage depending on its connection. Fixed resistors should have absolute
TCR's less than 100ppm/C to minimize sensitivity to changes in temperature.
A single resistor connected from the Trim pin (pin 9) to the +3.3V Output (pin 8),
see Figure 4, will decrease the output voltages. A resistor connected from the
Trim pin (pin 9) to Output Return (pin 7) will increase the output voltages.
Trim adjustments greater than 5% can have an adverse effect on the convert-
er's performance and is not recommended.
Figure 3. Trim Connections Using A Trimpot
DOWN
3.3 V
O
R
T
(k) =
14
2.49(V
O
1.234)
20k
5-22
Turns
+INPUT
+5V OUTPUT
+3.3V OUTPUT
TRIM
OUTPUT
RETURN
INPUT
CASE
1
2
4
ON/OFF
CONTROL
3
5
9
7
+5V LOAD
+3.3V LOAD
8
+5V LOAD
+3.3V LOAD
R TRIM
DOWN
+INPUT
+5V OUTPUT
+3.3V OUTPUT
TRIM
OUTPUT
RETURN
INPUT
CASE
1
2
4
ON/OFF
CONTROL
3
5
9
7
8
+5V LOAD
+3.3V LOAD
R TRIM
UP
+INPUT
+5V OUTPUT
+3.3V OUTPUT
TRIM
OUTPUT
RETURN
INPUT
CASE
1
2
4
ON/OFF
CONTROL
3
5
9
7
8
Figure 4. Decrease Output Voltage Trim Connections
Using A Fixed Resistor
Figure 5. Increase Output Voltage Trim Connections
Using A Fixed Resistor
Accuracy of adjustment is subject to tolerances or resistor values and
factory-adjusted output accuracy. V
O
= desired output voltage.
R
T
(k) =
UP
V
O
3.3
14
3.073
5V & 3.3V Regulation
The XWR Series converters are designed such that both the 5V and 3.3V
outputs share a common regulation feedback control loop. Though the feed-
back loop is infl uenced by both outputs, the 3.3 Volt output is dominant. As
a result, the 3.3 Volt regulation (0.5%) is superior to the 5 Volt regulation
(1.5%).
The converters are specifi ed for load regulation of minimum (250mA) to
100% loading. All models are stable under no-load conditions, but operation
below minimum load mandates an increase in the regulation tolerance of
0.5% for 3.3 Volt output and an increase of 1% for the 5 Volt output. A
slight increase in switching noise may also be observed for operation below
minimum loading. Operation with a full load on 3.3 Volt output and light to no
load on 5 Volt output is the most demanding for +5V regulation.
Filtering and Noise Reduction
The XWR Series Converters achieve their rated ripple and noise specifi ca-
tions with the use of 0.47F ceramic in parallel with 100F tantalum output
capacitors. In critical applications, input/output noise may be further reduced
by installing additional external I/O capacitors. Input capacitors should be
selected for bulk capacitance, low ESR and high rms-ripple-current ratings.
Output capacitors should be selected for low ESR and appropriate frequency
response. All caps should have appropriate voltage ratings and be located as
close to the converter as possible.
Thermal Shutdown
These XWR converters are equipped with Thermal Shutdown Circuitry. If
the internal temperature of the DC/DC converter rises above the designed
operating temperature, a precision temperature sensor will power down the
unit. When the internal temperature decreases below the threshold of the
temperature sensor, the units will self start.
Current Limiting
When power demands from either output fall within 120% to 190% of the
rated output current, the DC/DC converter will go into a current limiting
mode. In this condition, both output voltages will decrease proportionately
with increases in output current, thereby maintaining a somewhat constant
power dissipation.
This is commonly referred to as power limiting. Current limit inception is
defi ned as the point where the full-power output voltage falls below the
specifi ed tolerance. If the load current being drawn from the converter is
signifi cant enough, the unit will go into a short circuit condition. See "Short
Circuit Condition."
Short Circuit Condition
When a converter is in current limit mode the output voltages will drop as
the output current demand increases. If the output voltage drops too low, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller.
Following a time-out period of 5 to 15 milliseconds, the PWM will restart,
causing the output voltages to begin ramping to their appropriate values. If
the short-circuit condition persists, another shutdown cycle will be initiated.
This on/off cycling is referred to as "hiccup" mode. The hiccup cycling
reduces the average output current, thereby preventing internal temperatures
from rising to excessive levels. The modules are capable of enduring an
indefi nite short circuit output condition.
5
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