Dual Output
Mixed Voltage, DSM/DWR Models
SMT or Through-Hole, 3.3V and 5V
15Watt, DC/DC Converters
Features
■
■
■
■
■
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
UL/EN60950 safety approvals
mark available (75V-input models)
Continuous short-circuit protection
Fully isolated, 1500Vdc guaranteed
–40 to +100°C operating temperature
Input under and overvoltage shutdown
Output OVP, thermal shutdown
■
■
■
■
■
■
■
■
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 meet-
ing 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 com-
bination 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 finish,
DSM/DWR converters are regulated by a 3.3V control loop that provides load regu-
lation of ±0.5% for 3.3V output and ±1.5% for 5V output.
All models include input filtering, 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 rectification provides high efficiency (86%) and a stable output under no-load
conditions.
DSM/DWR power sharing modules offer low output ripple and noise per-
formance, 1500 Vdc isolation voltage, and are fully specified for –40 to +100°C
operation. These devices meet IEC950, UL1950 and EN6950 safety standards; CB
reports are available on request. "D48" models are CE marked (meets LVD require-
ments).
+INPUT
(1)
+5V OUTPUT
(5)
SWITCH
CONTROL
+3.3V OUTPUT
(8)
–INPUT
(2)
ON/OFF
CONTROL
(3)
PWM
CONTROLLER
OUTPUT
RETURN
(7)
OPTO
ISOLATION
UV & OV
COMPARATORS
THERMAL
SHUTDOWN
REFERENCE &
ERROR AMP
TRIM
(9)
Figure 1. Simplified Schematic
XWR Series
1 5 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide
V
OUT
(Volts)
5
3.3
5
3.3
5
3.3
➀
Input
Regulation (Max.)
Line
±1%
±0.5%
±1%
±0.5%
±1%
±0.5%
Model
DSM-5/2.65-3.3/3-D12
DWR-5/2.65-3.3/3-D12
DSM-5/2.65-3.3/3-D24
DWR-5/2.65-3.3/3-D24
DSM-5/2.65-3.3/3-D48
DWR-5/2.65-3.3/3-D48
I
OUT
➁
(Amps)
2.65
3
2.65
3
2.65
3
Output
R/N (mVp-p)
➂
Typ.
40
60
40
60
40
60
Max.
75
100
75
100
75
100
Load
➃
±1.5%
±0.5%
±1.5%
±0.5%
±1.5%
±0.5%
V
IN
Nom.
(Volts)
12
24
48
Range
(Volts)
10-18
18-36
36-75
I
IN
➄
(mA)
60/1450
35/730
20/370
Efficiency
Min.
83%
83%
83%
Typ.
86%
85%
85%
Package
(Case,
Pinout)
C18A, P36
C34, P36
C18A, P36
C34, P36
C18A, P36
C34, P36
➀
Typical at T
A
= +25°C under nominal line voltage and balanced "full-load" conditions (5V @ 1.5A/3.3V @ 2.25A).
➁
Any combination of 5V/3.3V rated I
OUT
current, not to exceed 15 Watts of output power. (See derating graphs.)
➂
Ripple/Noise (R/N) measured over a 20MHz bandwidth. All models are specified with 0.47µF ceramic
in parallel with 100µF tantalum output capacitors.
PA R T N U M B E R S T R U C T U R E
➃
Tested from 250mA to 100% full load (other output at 250mA load).
➄
Nominal line voltage, no load/balanced full-power condition.
DSM
-
5
/
2.65
-
3.3
/
3
-
D48 LX
-
C
Dual Output:
DSM: Surface-Mount Series
(Selective soldering only)
DWR: Through-Hole Series
V
1
Nominal Output Voltage:
5 Volts
I
1
Maximum Output Current:
2.65 Amps
V
2
Nominal Output Voltage:
3.3 Volts
M E C H A N I C A L S P E C I F I C AT I O N S
0.100
(2.54)
4
3
0.500
(12.70)
2
0.300
(7.62)
1
TOP VIEW
0.10
(2.54)
2.00
(50.80)
0.110
(2.79)
0.060
(1.52)
0.015
(0.38)
9
0.110
(2.79)
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
L2
Pin length: 0.110 inches (2.79mm) ±0.010
Pin length: 0.145 inches (3.68mm) ±0.010
RoHS-6 compliant*
See Optional Functions
Input Voltage Range:
D12
= 10-18 Volts (12V nominal)
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
I
2
Maximum Output Current:
3 Amps
t
DWR
models only
Note:
Not all model number combinations
are available. Contact C&D-DATEL.
*
Contact C&D Technologies
(Datel) for availability.
2.00
(50.80)
Case C18A
DSM Models
8
7
6
5
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
0.45
(11.43)
Case C34
DWR Models
METAL CASE
1.00
(25.40)
INSULATED PAD
0.040 ±0.001 DIA.
(1.016 ±0.025)
1.800
(45.72)
1
0.300
(7.62)
2
3
4
0.200
(5.08)
5
6
7
8
9
BOTTOM VIEW
0.800 (20.32)
1.00
4 EQ. SP. @
(25.40)
0.200 (10.16)
0.20 MIN
(5.08)
0.10
(2.54)
0.52
(13.21)
INSULATED BASE
METAL CASE
DIMENSIONS ARE IN INCHES (MM)
0.015
(0.38)
0.055
(1.40)
0.10
(2.54)
I/O Connections
Pin
1
2
3
4
5
6
7
8
9
Function P36
+Input
–Input
On/Off Control
Case
+5V Output
NC
Output Return
+3.3V Output
Trim
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1 5 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
DSM/DWR Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
➀
Input
Input Voltage Range:
D12 Models
D24 Models
D48 Models
Overvoltage Shutdown:
D12 Models
D24 Models
D48 Models
Start-Up Threshold:
D12 Models
D24 Models
D48 Models
Undervoltage Shutdown:
D12 Models
D24 Models
D48 Models
Input Current:
Normal Operating Conditions
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current
➇
Internal Input Filter:
Capacitive
D12 Models
D24 Models
D48 Models
Reverse-Polarity Protection:
D12 Models
D24 Models
D48 Models
On/Off Control:
(Pin 3):
➂ ➄
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
18.5-21 Volts (19V typical)
37-40 Volts (38.5V typical)
77-81 Volts (79.5V typical)
9.4-10 Volts (9.6V typical)
16.5-18 Volts (17V typical)
34-36 Volts (35V typical)
7.0-8.5 Volts (8V typical)
15.5-17.5 Volts (16.5V typical)
32.5-35.5 Volts (33.5V typical)
See Ordering Guide
10mA
10mAp-p
10µF
3.3µF
1.5µF
1 minute duration, 3A maximum
1 minute duration, 2A maximum
1 minute duration, 1A maximum
On = open or 13V to +V
IN
,
I
IN
@ 13V = 800µA
Off = 0 to 0.8V, I
IN
@ 0V = 2mA
Short Circuit Current:
5V Output
3.3V Output
Maximum Capacitive Loading
Temperature Coefficient
Output (continued)
5.5 Amps average, continuous current
3 Amps average, continuous current
330µF per output
±0.02% per °C
Dynamic Characteristics
Dynamic Load Response:
➁
5V (50-100% step to 98% V
OUT
)
3.3V (50-100% step to 98.5% V
OUT
)
Start-Up Time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
MTBF:
➅
D12 Models
D24 Models
D48 Models
Operating Temperature:
(Ambient):
➁
Without Derating:
With Derating
Case Temperature:
Maximum Operational
For Thermal Shutdown
Storage Temperature
Dimensions
Internal Case Connection
Case Material
200µsec maximum (3.3V @ 0.25A)
200µsec maximum (5V @ 0.25A)
10msec
10msec
260kHz (±25kHz)
Environmental
TBD hours
2.1 million hours
2.4 million hours
–40 to +60°C
To +100°C (See Derating Curves)
+100°C
101°C minimum, 115°C maximum
–40 to +120°C
Physical
See Mechanical Specifications
Case connection via pin 4
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Brass, solder coated, surface-mount leads
1.6 ounces (46 grams)
Output
V
OUT
Accuracy:
5V Output
3.3V Output
Minimum Load For Stability
Ripple/Noise
(20MHz BW)
➃
Line/Load Regulation
Efficiency
Cross Regulation:
5V Output
(5V@1.5A, 3.3V@0.25-2.25A)
3.3V Output
(3.3V@2.25A, 5V@0.25-1.5A)
Trim Range
➁
Isolation Voltage:
Input-to-Output
Input-to-Case
Output-to-Case
Isolation Capacitance
Isolation Resistance
Current Limit Inception:
5V @ 95% V
OUT
(3.3V @ 0.25A)
3.3V @ 97% V
OUT
(5V @ 0.25A)
Pin Material
±2.5% maximum
±1.5% maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide / Efficiency Curves
Weight
Minimum Loading Per Specification
➆
250mA
Primary to Secondary Insulation Level
Operational
➀
Balanced "full-load" is 5V @ 1.5A/3.3V @ 2.25A. All models are specified with external
0.47µF ceramic and 100µF tantalum output capacitors.
➁
See Technical Notes/Graphs for details.
➂
Applying a voltage to On/Off Control (pin 3) when no input power is applied to the
converter can cause permanent damage.
➃
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➄
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).
➅
Demonstrated MTBF available on request.
➆
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade.
➇
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 22µF
input capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering,
Input Ripple Current and Output Noise for details.
±2%
±0.5%
±5%
1500Vdc minimum
1000Vdc minimum
1000Vdc minimum
560pF
100MΩ
3.3-4 Amps
4.7-5.7 Amps
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3
XWR Series
1 5 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12 Models
D24 Models
D48 Models
Transient (100msec): D12 Models
D24 Models
D48 Models
21 Volts
40 Volts
81 Volts
25 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
3 Amps
2 Amps
1 Amps
Current limited. Devices can withstand
an indefinite output short circuit.
+V
IN
–40 to +120°C
+300°C
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 specification listed
in the Performance/Functional Specifications 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 sufficiently 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 specified 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 specification defines the interval between the time at which the converter
is turned on and the fully loaded output voltage enters and remains within
its specified 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.
Input Reverse-Polarity Protection:
➁
D12 Models
D24 Models
D48 Models
Output Current
➁
On/Off Control (Pin 3) Max. Voltages:
Referenced to –Input (pin 2)
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
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 Specifications Table is not implied, nor recommended.
TECHNICAL NOTES
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 specific grounding of the case on either the input or the output side, or
leaving the case disconnected, i.e. “floating.”
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
D12 Models
D24 Models
D48 Models
Fuse Value
3 Amps
2 Amps
1 Amps
1
+INPUT
13V CIRCUIT
3
ON/OFF
CONTROL
5V CIRCUIT
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
2
–INPUT
Figure 1. Internal On/Off Control circuitry
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4
1 5 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
DSM/DWR Models
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 influenced 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 specified 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 specifica-
tions with the use of 0.47µF ceramic in parallel with 100µF 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
defined as the point where the full-power output voltage falls below the
specified tolerance. If the load current being drawn from the converter is
significant enough, the unit will go into a short circuit condition. See “Short
Circuit Condition.”
Short Circuit Condition
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 fixed resistor as shown in
Figures 4 and 5. A single fixed 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.
5
+5V LOAD
–INPUT
3
4
CASE
TRIM
9
ON/OFF
CONTROL
+3.3V OUTPUT
OUTPUT
RETURN
7
20kΩ
5-22
Turns
+3.3V LOAD
1
+INPUT
2
+5V OUTPUT
8
Figure 3. Trim Connections Using A Trimpot
1
+INPUT
2
–INPUT
3
4
CASE
ON/OFF
CONTROL
+5V OUTPUT
5
+5V LOAD
OUTPUT
RETURN
7
+3.3V LOAD
+3.3V OUTPUT
TRIM
8
9
R TRIM
DOWN
R
T
DOWN
(kΩ) =
2.49(V
O
– 1.234)
3.3 – V
O
–14
Figure 4. Decrease Output Voltage Trim Connections
Using A Fixed Resistor
1
+INPUT
2
–INPUT
3
ON/OFF
CONTROL
+5V OUTPUT
5
+5V LOAD
OUTPUT
RETURN
7
+3.3V LOAD
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
indefinite short circuit output condition.
4
CASE
+3.3V OUTPUT
TRIM
8
9
R TRIM
UP
R
T
UP
(kΩ) =
3.073
V
O
– 3.3
–14
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.
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