®
®
INNOVATION and EXCELLENCE
Single Output
ULE 20A Models
Isolated, High-Density, Eighth-Brick
5-20 Amp, DC/DC Converters
Features
New 1/8-brick package, 1/4-brick pinout
in through-hole or SMT version
0.89 x 2.22 x 0.36 in. (22.6 x 56.4 x 9.1mm)
Output current: 5-20 Amps
Output voltages: 1.2/1.5/1.8/2.5/3.3/5/12V
Input voltage: 24V and 48V nominal
Interleaved, synchronous-rectifier
topology delivers:
•
Outstanding efficiency (to 92%)
•
Low noise (50-70mVp-p)
•
Stable no-load operation
•
No output reverse conduction
Excellent thermal performance
On/off control, trim and sense pins
Fully isolated (2250Vdc BASIC)
Fully I/O protected; Thermal shutdown
UL/EN/IEC60950 certification requested
DATEL's new ULE Series "Eighth-Brick" DC/DC Converters are high-current
isolated power converters designed for use in high-density system boards. Measuring
just 0.89 x 2.22 x 0.36 inches ( 22.6 x 56.4 x 9.1mm), these open-frame, low-profile
E-bricks fit the industry-standard quarter-brick footprint. Now you can "cut-and-paste"
the layout from your last Q-brick design to save time and save 44% board space
(1.86 square inches versus 3.3) in the process.
From an 18-36V or 36-75V input, ULE's deliver 1.2, 1.5, 1.8, 2.5, or 3.3 Volt outputs
fully rated at 20 Amps (5V @ 12A and 12V @ 5A). They employ an interleaved,
synchronous-rectifier topology that exploits 100% of their duty cycle. They simultane-
ously achieve high efficiency (to 92%), low noise (50-70mVp-p), tight line/load regula-
tion (±0.25%), and quick step response (150µsec).
An open-frame design, high efficiency, low-on-resistance FET's, and planar mag-
netics embedded in heavy-copper pc boards all contribute to impressive thermal
derating. All ULE's deliver full power to +70°C with a mere 100lfm (0.5m/s) air flow.
The ULE's feature set includes high isolation (2250Vdc, 48V models), input pi
filters, input undervoltage shutdown, output overvoltage protection, current limiting,
short-circuit protection, and thermal shutdown. The standard footprint carries V
OUT
trim, on/off control, and sense pins.
All ULE E-Bricks are designed to meet the BASIC-insulation requirements of
UL/EN/IEC60950, and all "D48" models (36-75V input ranges) will carry the CE mark.
Safety certifications, EMC compliance testing and qualification testing (including
HALT) are currently in progress. Contact DATEL for latest updates.
+SENSE
(7)
+V
IN
(3)
+V
OUT
(8)
SWITCH
CONTROL
–V
OUT
(4)
–V
IN
(1)
–SENSE
(5)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
V
OUT
TRIM
(6)
REMOTE
ON/OFF
CONTROL*
(2)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
* Can be ordered with positive ("P" suffix) or negative ("N" suffix) polarity.
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
ULE Series
Performance Specifications and Ordering Guide
V
OUT
(Volts)
1.2
1.5
1.8
2
2.5
2.5
3.3
3.3
3.3
5
5
5
12
12
2 4 - 6 0 W, S I N G L E O U T P U T D C / D C C O N V E RT E R S
➀
Input
Package
(Case,
Pinout)
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52,P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
C56, C52, P32
Model
➁
ULE-1.2/20-D48
➅
ULE-1.5/20-D48
➅
ULE-1.8/20-D48
ULE-2/20-D48
➅
ULE-2.5/20-D24
ULE-2.5/20-D48
ULE-3.3/20-D12
➅
ULE-3.3/20-D24
➅
ULE-3.3/20-D48
ULE-5/10-D12
➅
ULE-5/12-D24
ULE-5/12-D48
ULE-12/4.2-D24
➅
ULE-12/5-D48
➅
I
OUT
(Amps)
20
20
20
20
20
20
20
20
20
10
10
12
4.2
5
Output
R/N (mVp-p)
➂
Typ.
50
50
40
50
50
50
50
50
50
50
50
50
50
70
Regulation (Max.)
Line
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.1%
±0.25%
Max.
100
100
80
100
100
100
100
100
100
100
100
100
100
140
Load
➃
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.25%
±0.1%
±0.25%
V
IN
Nom.
(Volts)
48
48
48
48
24
48
12
24
48
12
24
48
24
48
Range
(Volts)
36-75
36-75
36-75
36-75
18-36
36-75
10-18
18-36
36-75
10-18
18-36
➆
36-75
18-36
➆
36-75
I
IN
➄
(mA/A)
50/0.6
50/0.7
40/0.9
50/1
55/2.5
50/1.2
TBD
50/3.1
50/1.6
TBD
50/2.3
50/1.4
55/2.81
60/1.4
Efficiency
Min.
84%
85%
84.5%
85%
TBD
86.5%
TBD
87%
87%
TBD
87.5%
88.5%
86.5%
90%
Typ.
86%
87%
86%
87%
87%
88%
88%
89%
89%
89%
90%
90.5%
89%
92%
➀
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless otherwise
noted. All models are tested and specified with external output capacitors (1µF multi-layer
ceramic in parallel with 10µF tantalum).
➁
Add "N" or "P" to the part number for Remote Control Polarity. See Part Number Structure.
➂
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth.
M E C H A N I C A L S P E C I F I C AT I O N S
½½½½
½½½½½½
➃
Devices have no minimum-load requirements and will regulate under no-load conditions.
Regulation specifications describe the output voltage deviation as the line voltage or load is
varied from its nominal/midpoint value to either extreme. (Load step = 50%.)
➄
Nominal line voltage, no load/full load conditions.
➅
Contact DATEL for availability.
➆
Half load output is 18V
IN
minimum. Full load output is 20V
IN
minimum.
½½½½½½½½½½½½
½
½½½½
½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½½½½
½½ ½½½½½½½½½½½½½½½½½½½½½½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
½½½½½
½½½½½½
½½½½½½½½½½½½½½½½
½½½½½½½½½½½½½½½½½
½½½½½½½½½½½½
½
½½½½½½½½½½
½½½½½½
TOLERANCES: 3 decimal places = ±0.005 inches
2 decimal places = ±0.01 inches
Unless otherwise stated.
½
½
½
½
½
½
½
½½½½½½½½½½½½½
½½½½½½½½½½½½
½½½½½½½½½½½½
½
½
½
½
½
½½½½½½
½½½½½½½
½
½
½
½
½
½½½½½½½½½½½
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
½
½½½½
½½½½½½½
½½½½½½
½½½½½½½
½
½
½½½½
½½½½½½½
½½½½½
½½½½½½
½½½½½
½½½½½½
½
½½½½½½½½½½
½½½½½½
½½½½½½½½½½½
½½½½½½½½½½½½½
½½½½½½½½½½½½½½
½½½½½½½½½½½½
Case C56 Through-Hole Package
I/O Connections
Pin Function P32
1
–Input
2 On/Off Control *
3
+Input
4
–Output
5
–Sense
6
Output Trim
7
+Sense
8
+Output
* The Remote On/Off
can be provided with
either positive (P suffix)
or negative (N suffix)
polarity.
PA R T N U M B E R S T R U C T U R E
Case C52 Surface-Mount Package
U LE
-
1.8
/
20
-
D48 N
M Lx
Output Configuration:
U = Unipolar/Single
Eighth-Brick Package
Nominal Output Voltage:
1.2/1.5/1.8/2.5/3.3/5/12 Volts
Maximum Rated Output
Current in Amps
Input Voltage Range:
D12 = 10-18 Volts (12V nominal)
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
Pin Length Option:
Through-hole packages only
(100 pcs. minimum quantity)
L1 Pin length 0.110 ±0.010 inches (2.79 ±0.25mm)
L2 Pin length 0.145 ±0.010 inches (3.68 ±0.25mm)
Surface-Mount Package
Contact DATEL for availability
Remote On/Off Control Polarity:
Add "P" for positive polarity
(pin 2 open = converter on)
Add "N" for negative polarity
(pin 2 open = converter off)
Note:
Not all model number
combinations are available.
Contact DATEL.
2
½
2 4 - 6 0 W, S I N G L E O U T P U T D C / D C C O N V E RT E R S
ULE Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀
Short Circuit Detection
Short Circuit Protection Method
Short Circuit Current
Short Circuit Duration
Overvoltage Protection:
ULE-1.8/20-D48
ULE-2.5/20-D48
ULE-3.3/20-D48
ULE-5/12-D24
ULE-5/12-D48
Capacitive Load
(ESR = 0.02Ω maximum)
Dynamic Load Response:
(50-75-50% load step to ±2% of V
OUT
)
Start-Up Time:
On/Off or V
IN
on to V
OUT
Switching Frequency:
ULE-1.8/20-D48
ULE-2.5/20-D48
ULE-3.3/20-D48
ULE-5/12-D24
ULE-5/12-D48
Calculated MTBF
➃
See Note 6
Hiccup with autorecovery, See Tech Notes
2-5 Amps (model dependent)
Continuous, output shorted to ground
Method: magnetic feedback
3Vdc
3Vdc
3.96Vdc
6Vdc
6.4Vdc
10,000µF typical
15,000µF maximum
Input
Input Voltage Range:
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, Under Voltage)
Output Short-Circuit Condition
Low Line Voltage (V
IN
= V
MIN
):
ULE-1.8/20-D48
ULE-2.5/20-D48
ULE-3.3/20-D48
ULE-5/12-D24
ULE-5/12-D48
Input Reflected Ripple Current
➁
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
➇
No-load Input Current
Remote On/Off Control:
➄
Positive Logic ("P" suffix models)
Negative Logic ("N" suffix models)
Remote Control On/Off Current
Sense Input Range
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
9-10 Volts (9.6V typical)
18-20 Volts (19V typical)
31-36 Volts (35V typical)
8.5-9.5 Volts (9V typical)
16.5-18.5 Volts (17.5V typical)
32.5-34.5 Volts (33.5V typical)
See Ordering Guide
1-8mA (model dependent)
40-250mA (model dependent)
1.08 Amps
1.50 Amps
2.05 Amps
3.31 Amps
1.82 Amps
15-25mAp-p (model dependent)
LC type
None
5A max., 10sec max. via external fuse
16-90mA (model dependent)
OFF = ground pin or +0.8 V max.
ON = open pin or +V
IN
max.
ON = ground pin or +0.8 V max.
OFF = open pin or +V
IN
max.
1mA pulldown
+10% of V
OUT
Dynamic Characteristics
200-250µSec, model dependent.
90mSec for V
OUT
= nominal
340kHz ±10%
400kHz ±10%
365kHz ±10%
485kHz ±10%
450kHz ±10%
Environmental
TBD Hours
Operating Temperature Range
(Ambient)
No derating, natural convection
(50-100 lfm self-cooling)
+60 to +75°C, model dependent, see
derating curves
With derating
See derating curves
Storage Temperature Range
–40 to +125°C
Thermal Protection/Shutdown
Altitude
Relative Humidity
Outline Dimensions
Pin Material
(Through-hole model)
Weight
Flammability Rating
Electromagnetic Interference
Safety
120°C
0 to 10,000 feet
10% to 90%, non-condensing
Physical
See Mechanical Specifications
Round copper with tin-lead plate
over nickel underplate
TBD ounces
UL94V-0
FCC Part 15, EN55022, (conducted or
radiated) Class B
UL/cUL 60950 CSA-C22.2 No.234
IEC/EN 60950
Output
Total Output Power
(V
OUT
x I
OUT
must not exceed maximum power):
➆
ULE-1.8/20-D48
36.36 Watts
ULE-2.5/12-D48
50.50 Watts
ULE-3.3/20-D48
66.83 Watts
ULE-5/12-D24
60.60 Watts
ULE-5/12-D48
60.75 Watts
Voltage Output Accuracy
(50% load):
Initial
Temperature Coefficient
Minimum Loading
➀
Ripple/Noise
(20MHz bandwidth)
Line/Load Regulation
Efficiency
V
OUT
Trim Range
Isolation Voltage,
input/ouput:
D12 and D24 models
D48 models
Isolation Safety Rating
Isolation Resistance
Isolation Capacitance
Current Limit Inception
(98% of V
OUT
):
ULE-5/12-D24
ULE-5/12-D48
20 Amp models
±1.25% (except ±1.5% 1.8V)
0.02% of V
OUT
per
°C
No minimum load
See Ordering Guide
See Ordering Guide
See Ordering Guide
–15% to +10%
1500 Vdc min.
2250 Vdc min.
Basic
100MΩ
470-1750pF (model dependent)
16A (cold start), 15A (warmed up)
18A (cold start), 16A (warmed up)
26A (cold start), 24A (warmed up)
➀
All models are tested and specified with external 22µF tantalum input capacitor and 10µF/
1µF tantalum/ceramic output capacitors. These capacitors are necessary to accommodate our
test equipment and may not be required to achieve specified performance in your applications.
All models are stable and regulate within spec under no-load conditions. Standard airflow is
300 lfm for extended operation.
➁
Input Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filtering is
C
IN
= 33µF, C
BUS
= 220µF, L
BUS
= 12µH.
➂
Current limit inception is given at either cold start-up or after warm-up.
➃
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,
ground fixed conditions, T
CASE
= +25°C, full load, natural air convection.
➄
The On/Off Control may be driven with open-collector logic or by applying appropriate
external voltages referenced to Common. The On/Off Control Input should use either an open
collector/open drain transistor or logic gate which does not exceed +V
IN
.
➅
Short circuit shutdown begins when the output voltage degrades approximately 2% from the
selected setting.
➆
Note that Maximum Power Derating curves indicate an average current at nominal input
voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate shorter
full current outputs if the total RMS current over time does not exceed the Derating curve.
➇
The user must install an external fuse in series with the input to protect against reverse polarity.
See Input Fusing.
3
ULE Series
2 4 - 6 0 W, S I N G L E O U T P U T D C / D C C O N V E RT E R S
Absolute Maximum Ratings
Input Voltage:
Continuous:
12 Volt input models
24 Volt input models
48 Volt input models
Transient (100 mSec. Max.)
12 Volt input models
24 Volt input models
48 Volt input models
On/Off Control
(pin 2)
Input Reverse Polarity Protection
Output Overvoltage Protection
Output Current *
All D12 models will start-up at 9.6V typically and will then work within specifi-
cations from 10-18V.
Start-Up Time
The V
IN
to V
OUT
Start-Up Time is the interval of time between the point at
which the ramping input voltage crosses the Start-Up Threshold 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 load. The ULE Series implements a soft start
circuit that limits the duty cycle of its 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 point 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 Con-
trol to V
OUT
start-up time is also governed by the internal soft start circuitry
and external load capacitance.
The difference in start up time from V
IN
to V
OUT
and from On/Off Control to
V
OUT
is therefore insignificant.
Input Source Impedance
ULE converters must be driven from a low ac-impedance input source.
The DC/DC's performance and stability can be compromised by the use of
highly inductive source impedances. The input circuit shown in Figure 2 is a
practical solution that can be used to minimize the effects of inductance in
the input traces. For optimum performance, components should be mounted
close to the DC/DC converter. If the application has a high source imped-
ance, low V
IN
models can benefit of increased external input capacitance.
I/O Filtering, Input Ripple Current, and Output Noise
All models in the ULE 24-60 Watt DC/DC Converters are tested/specified for
input reflected ripple current and output noise using the specified external
input/output components/circuits and layout as shown in the following two
figures.
External input capacitors (C
IN
in Figure 2) serve primarily as energy-storage
elements, minimizing line voltage variations caused by transient IR drops in
conductors from backplane to the DC/DC. Input caps should be selected for
bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-
current ratings. The switching nature of DC/DC converters requires that dc
voltage sources have low ac impedance as highly inductive source imped-
ance can affect system stability. In Figure 2, C
BUS
and L
BUS
simulate a typical
dc voltage bus. Your specific system configuration may necessitate additional
considerations.
18 Volts
36 Volts
75 Volts
25 Volts
50 Volts
100 Volts
+V
IN
5 Amps, 10 sec. max.
Magnetic feedback. See note (7).
Current-limited. Devices can withstand
sustained short circuit without
damage.
–40 to +125°C.
+300°C, 10 seconds max.
Refer to solder profile.
Storage Temperature
Lead Temperature
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.
* The outputs are not intended to sink appreciable current. If the outputs are forced to sink
excessive current, damage may result.
T E C H N I C A L
N O T E S
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 sustained, non-current-limited, input-voltage polarity
reversals exist. For DATEL ULE 24-60 Watt DC/DC Converters, you should
use slow-blow type fuses, installed in the ungrounded input supply line, with
values no greater than the following.
Model
12 Volt Input
24 Volt input
48 Volt Input
Fuse Values
10 Amps
5 Amps
4 Amps
All relevant national and international safety standards and regulations must
be observed by the installer. For system safety agency approvals, the con-
verters must be installed in compliance with the requirements of the end-use
safety standard, e.g. IEC/EN/UL60950.
Input 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. Once
operating, devices will not turn off until the input voltage drops below the
Undervoltage Shutdown limit. 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.
4
2 4 - 6 0 W, S I N G L E O U T P U T D C / D C C O N V E RT E R S
ULE Models
TO
OSCILLOSCOPE
CURRENT
PROBE
+SENSE
COPPER STRIP
+INPUT
+
L
BUS
C
BUS
C
IN
+OUTPUT
V
IN
–
C1
C2
SCOPE
R
LOAD
–INPUT
–OUTPUT
–SENSE
C
IN
= 33µF, ESR < 700mΩ @ 100kHz
C
BUS
= 220µF, ESR < 100mΩ @ 100kHz
L
BUS
= 12µH
COPPER STRIP
Figure 2. Measuring Input Ripple Current
C1 = 0.47µF CERAMIC
C2 = NA
LOAD 2-3 INCHES (51-76mm) FROM MODULE
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using fil-
tering techniques, the simplest of which is the installation of additional exter-
nal output capacitors. These output caps function as true filter elements and
should be selected for bulk capacitance, low ESR and appropriate frequency
response. All external capacitors should have appropriate voltage ratings and
be located as close to the converter as possible. Temperature variations for
all relevant parameters should also be taken carefully into consideration.
The most effective combination of external I/O capacitors will be a function
of line voltage and source impedance, as well as particular load and layout
conditions. Our Applications Engineers can recommend potential solutions
and discuss the possibility of our modifying a given device's internal filtering
to meet your specific requirements. Contact our Applications Engineering
Group for additional details.
In Figure 3, the two copper strips simulate real-world pcb impedances
between the power supply and its load. In order to minimize measurement
errors, scope measurements should be made using BNC connectors, or the
probe ground should be less than ½ inch and soldered directly to the fixture.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating" with
respect to their input. Designers will normally use the –Output (pin 4) as the
ground/return of the load circuit. You can, however, use the +Output (pin 8) as
ground/return to effectively reverse the output polarity.
Figure 3. Measuring Output Ripple/Noise (PARD)
Minimum Output Loading Requirements
ULE converters employ a synchronous-rectifier design topology and all
models regulate within spec and are stable under no-load to full load condi-
tions. Operation under no-load conditions however might slightly increase the
output ripple and noise.
Thermal Shutdown
These ULE converters are equipped with thermal-shutdown circuitry. If envi-
ronmental conditions cause the internal temperature of the DC/DC converter
to rise 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 unit will self start. See
Performance/Functional Specifications.
Output Overvoltage Protection
ULE output voltages are monitored for an overvoltage condition via magnetic
feedback. The signal is coupled to the primary side and if the output voltage
rises to a level which could be damaging to the load, the sensing circuitry
will power down the PWM controller causing the output voltages to decrease.
Following a time-out period the PWM will restart, causing the output voltages
to ramp to their appropriate values. If the fault condition persists, and the
output voltages again climb to excessive levels, the overvoltage circuitry will
initiate another shutdown cycle. This on/off cycling is referred to as "hiccup"
mode.
Contact DATEL for an optional output overvoltage monitor circuit using a
comparator which is optically coupled to the primary side thus allowing
tighter and more precise control.
Current Limiting
As soon as the output current increases to 10% to 50% above its rated value,
the DC/DC converter will go into a current-limiting mode. In this condition, the
output voltage will decrease proportionately with increases in output current,
thereby maintaining somewhat constant power dissipation. This is commonly
referred to as power limiting. Current limit inception is defined as the point at
which the full-power output voltage falls below the specified tolerance. See
Performance/Functional Specifications. If the load current, being drawn from
the converter, is significant enough, the unit will go into a short circuit condi-
tion as specified under "Performance."
5
PCB Design
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