®
®
INNOVATION and EXCELLENCE
Single Output
UEP Models
High-Density, 2" x 1"
1-4.5 Amp, 11-18 Watt DC/DC's
Features
Models Include
3.3V @ 4.5A
5V @ 3.5A
12V @ 1.2A
15V @ 1A
Choice of 3 input ranges:
10-18V, 18-36V, 36-75V
Guaranteed efficiencies to 86%
11-18 Watts in 1" x 2" package
340kHz synchronous-rectifier topologies
–40 to +60/70°C ambient w/o derating
Fully isolated (1500Vdc); I/O protected
Trim and On/Off Control
UL60950/EN60950 certified
CE mark (75V
IN
models)
The UEP 11-18Watt series DC/DC converter is an alternative pinout for DATEL’s
flagship A-Series. An external pinout configuration affords the design layout to be
oriented for optimal thermal performance thereby increasing available output power
as much as 20%. Available in a 1" x 2" package, these converters can deliver up to
18 Watts at the same ambient temperatures as their 15 Watt counterparts.
By combining a high-frequency (340kHz), high-efficiency (to 88%), synchronous-
rectifier topology with the newest components and time-tested, fully automated,
SMT-on-pcb construction, these UEP Models are able to bring you 11-18W in the
standard 2" x 1" package from which most competitors can only get 5-10W. All
UEP’s deliver their full output power over ambient temperature ranges from –40°C
to as high as +70°C (model and input voltage dependent) without heat sinks or
supplemental forced-air cooling. Devices derate to +100°C.
Output voltages are 3.3, 5, 12 or 15 Volts. Input voltage ranges are 10-18V
("D12" models), 18-36V ("D24" models) or 36-75V ("D48") models. All models fea-
ture input pi filters, input undervoltage and overvoltage lockout, input reverse-polarity
protection, output overvoltage protection, output current limiting, and continuous
short-circuit protection. Standard features also include On/Off Control and output-
trim. All models are certified to IEC950, UL60950 and EN60950 safety requirements
for OPERATIONAL insulation. "D48" models (36-75V inputs) are CE marked.
UEP 11-18W DC/DC’s are packaged in low-cost, light-weight, diallyl phthalate
(UL94V-0 rated) plastic packages with standoffs. EMC compliance is achieved via a
low-noise design rather than through expensive metal shielding.
+INPUT
+OUTPUT
SWITCH
CONTROL
➀
–OUTPUT
➀
–INPUT
PWM
CONTROLLER
UVLO & OVLO
COMPARATORS
ON/OFF
CONTROL
OPTO
ISOLATION
REFERENCE &
ERROR AMP
TRIM
➀
1.5, 1.8, 2.5, 3.3V and 5V-output models use the synchronous-rectifier configuration shown above.
12V and 15V-output models employ a standard, diode-rectification architecture.
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
UEP Series
➀
1 1 - 1 8 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
Performance Specifications and Ordering Guide
Output
Model
UEP-3.3/4500-D12
UEP-3.3/4500-D24
UEP-3.3/4500-D48
UEP-5/3500-D12
UEP-5/3500-D24
UEP-5/3500-D48
UEP-12/1400-D12
UEP-12/1400-D24
UEP-12/1400-D48
UEP-15/1200-D12
UEP-15/1200-D24
UEP-15/1200-D48
Input
Regulation (Max.)
Line
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
V
OUT
(Volts)
3.3
3.3
3.3
5
5
5
12
12
12
15
15
15
I
OUT
(mA)
4500
4500
4500
3500
3500
3500
1400
1400
1400
1200
1200
1200
R/N (mVp-p)
➁
Typ.
85
85
85
85
85
85
85
85
85
85
85
85
Max.
100
100
100
100
100
100
100
100
100
100
100
100
Load
➂
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
V
IN
Nom.
(Volts)
12
24
48
12
24
48
12
24
48
12
24
48
Range
(Volts)
10-18
18-36
36-75
10-18
18-36
36-75
10-18
18-36
36-75
10-18
18-36
36-75
I
IN
➃
(mA)
80/1490
50/730
35/360
120/1760
65/850
40/430
60/1650
45/800
20/400
60/1760
45/860
30/430
Efficiency
Min.
84.5%
87.5%
87.5%
86%
88%
88%
85%
87%
87%
85%
87%
87%
Typ.
83.5%
85.5%
85.5%
84%
86%
86%
82.5%
85%
85%
82.%
85%
85%
Package
(Case,
Pinout)
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
C15, P21
➀
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless otherwise noted.
➁
Ripple/Noise (R/N) is tested/speciifed over a 20MHz bandwidth. All models are specified with no
external input/output capacitors.
➂
Load regulation is specified over 10%-100% load conditions.
➃
Nominal line voltage, no-load/full-load conditions.
P A R T
N U M B E R
S T R U C T U R E
M E C H A N I C A L
S P E C I F I C A T I O N S
U EP
-
3.3
/
4500
-
D48 N
Output Configuration:
U
= Unipolar
Wide Range Input
Nominal Output Voltage:
3.3, 5, 12 or 15 Volts
Maximum Output Current
in mA
0.49
(12.45)
2.00
(50.80)
PLASTIC CASE
Case C15
STANDOFF
0.020 (0.51)
N Suffix
Available for 12V
OUT
and 15V
OUT
Models
0.20 MIN
(5.08)
0.040 ±0.002 DIA.
(1.016 ±0.051)
1.800
(45.72)
1
2
0.10
(2.54)
Input Voltage Range:
D12
= 10-18 Volts (12V nominal)
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
1.00
(25.40)
0.400
(10.16)
4
0.600
(15.24)
5
0.400
(10.16)
0.800
(20.32)
Optional Functions
UEP converters are designed such that the 12 and 15V
OUT
models can be
configures for either positive logic on/off control (no suffix) or negative logic ("N"
suffix). 3.3 and 5V
OUT
models are available with positive logic only (no suffix).
No Suffix
On/Off Control function (positive polarity) on pin 3
3
6
0.100
(2.54)
BOTTOM VIEW
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
N
On/Off Control function (negative polarity) on pin 3.
(12V and 15V models only.
I/O Connections
Pin Function P21
1
+Input
2
Input Return
3
On/Off Control
4
+Output
5
Output Return
6
Trim
2
1 1 - 1 8 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
UEP Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀➁
Environmental
Operating Temperature
(Ambient):
Without Derating
➅
With Derating
Case Temperature:
Maximum Allowable
Storage Temperature
Dimensions
Shielding
Case Material
–40 to +60/70°C
to +100°C (See Derating Curves)
+100°C
–40 to +105°C
Input
Input Voltage Range:
D12A Models
D24A Models
D48A Models
Overvoltage Shutdown:
D12A Models
D24A Models
D48A Models
Start-Up Threshold:
➂
D12A Models
D24A Models
D48A Models
Undervoltage Shutdown:
➂
D12A Models
D24A Models
D48A Models
Input Current:
Normal Operating Conditions
Standby Mode (Off, OV, UV)
Input Filter Type
Reverse-Polarity Protection
On/Off Control
(Optional, Pin 3):
➃
D12, D24, & D48 Models
D12N, D24N, & D48N Models
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
18.5-21 Volts (20V typical)
37-40 Volts (38V typical)
77-81 Volts (78.5V typical)
9.3-9.8 Volts (9.6V typical)
16.5-18 Volts (17V typical)
34-36 Volts (35V typical)
7-8.5 Volts (8V typical)
15.5-17.5 Volts (16.5V typical)
32.5-35.5 Volts (34.5V typical)
See Ordering Guide
5mA
Pi
Brief duration, 10A maximum
On = open or 13V - +V
IN
, I
IN
= 50µA max.
Off = 0-0.8V, I
IN
= 1mA max.
On = 0-0.5V, I
IN
= 50µA max.
Off = open or 2.4-10V, I
IN
= 3.7mA max.
Physical
2" x 1" x 0.49" (51 x 25 x 12.45mm)
None
Diallyl phthalate, meets EN60950
flamability requirements
Brass, solder coated
1.4 ounces (39.7 grams)
Pin Material
Weight
➀
➁
➂
➃
All models are specified with no external input/output capacitors.
See Minimum Output Loading Requirements under Technical Notes.
See Technical Notes for details.
The On/Off Control is designed to be driven with open-collector logic or the application of
appropriate voltages (referenced to –Input (Pin 2)). Applying a voltage to the On/Off Control
pin when no input voltage is applied to the converter may cause permanent damage.
See Technical Notes.
➄
Output noise may be further reduced with the addition of external output capacitors.
See Technical Notes.
➅
Operating temperature range without derating is model and input-voltage dependent.
See Temperature Derating.
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12 Models
D24 Models
D48 Models
Transient (100msec):
D12 Models
D24 Models
D48 Models
Input Reverse-Polarity Protection
Output Overvoltage Protection:
3.3V Outputs
5V/12V/15V Outputs
Output Current
Output
V
OUT
Accuracy
(50% load):
Minimum Loading:
➁
3.3V/5V Outputs
12V/15V Outputs
Ripple/Noise
(20MHz BW)
➀ ➄
Line/Load Regulation
Efficiency
Isolation Voltage:
Input-to-Output
Isolation Capacitance
Isolation Resistance
Current Limit Inception:
3.3V Models
5V Models
12V Models
15V Models
Short Circuit:
➂
Average Current
V
OUT
Trim Range
Overvoltage Protection
Temperature Coefficient
Transient Response
(50-100% load)
Start-Up Time:
➂
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
±1.5%, maximum
No load
25mA
See Ordering Guide
See Ordering Guide
See Ordering Guide
1500Vdc minimum
470pF
100MΩ
5.5-7 Amps
5.5-6 Amps
1.9-2.7 Amps
1.5-2.1 Amps
Hiccup, indefinite
3 Amps maximum
±5%
Zener/transorb clamp, magnetic feedback
±0.04% per °C.
22 Volts
44 Volts
88 Volts
50 Volts
50 Volts
100 Volts
Current must be <10 Amps. Brief
duration only. Fusing recommended.
4.5 Volts, unlimited duration
6.8/15/18 Volts, unlimited duration
Hiccup. Devices can
withstand sustained output short
circuits without damage.
+100°C
–40 to +105°C
+300°C
Case Temperature
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.
Dynamic Characteristics
200µsec max. to ±1.5% of final value
50msec
30msec
340kHz (±40kHz)
3
UEP Series
1 1 - 1 8 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
T E C H N I C A L
N O T E S
Trim adjustment greater than 5% can have an adverse effect on the convert-
er's performance and is not recommended.
4
+OUTPUT
+INPUT
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating."
Designers will usually use the –Output (pin 5) as the ground/return of the
load circuit. You can, however, use the +Output (pin 4) as ground/return to
effectively reverse the output polarity.
Minimum Output Loading Requirements
3.3 and 5V models employ a synchronous-rectifier design topology. All
models regulate within spec and are stable under no-load conditions. 12/15V
models employ a traditional forward, diode-rectification architecture and
require 25mA loading to achieve their listed regulation specs. Operation
under 25mA load conditions will not damage the 12/15V devices; however
they may not meet all listed specifications.
Filtering and Noise Reduction
All UEP Series DC/DC Converters achieve their rated ripple and noise
specifications with no external input/output capacitors. In critical applications,
input/output noise may be further reduced by installing external I/O caps.
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 volt-
age ratings and be mounted as close to the converters as possible.
The most effective combination of external I/O capacitors will be a function of
your particular load and layout conditions. Our Applications Engineers recom-
mend potential solutions and can 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.
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 exists. For DATEL UER 11-18 Watt DC/DC Converters, you should
use slow-blow type fuses with values no greater than the following.
V
IN
Range
D12 Models
D24 Models
D48 Models
Trimming Output Voltages
These converters have a trim capability (pin 6) that allows users to adjust the
output voltage ±5%. Adjustments to the output voltage can be accomplished
via a trim pot, Figure 2, or a single fixed resistor as shown in Figures 3 and 4.
A single fixed resistor can increase or decrease the output voltage depending
on its connection. Fixed resistors should have an absolute TCR less than
100ppm/°C to minimize sensitivity to changes in temperature.
A single resistor connected from the Trim (pin 6) to the +Output (pin 4), see
Figure 3, will decrease the output voltage. A resistor connected from the Trim
(pin 6) to –Output (pin 5) will increase the output voltage.
Fuse Value
3 Amps
2 Amps
1 Amp
1
2
–INPUT
TRIM
6
20kΩ
5-22
Turns
LOAD
3
ON/OFF
CONTROL
–OUTPUT
5
Figure 2. Trim Connections Using A Trim Pot
4
R
TRIM DOWN
2
–INPUT
TRIM
6
LOAD
1
+INPUT
+OUTPUT
3
ON/OFF
CONTROL
5
–OUTPUT
Figure 3. Trim Connections To Decrease Output Voltage Using Fixed Resistors
1
+INPUT
+OUTPUT
4
2
–INPUT
TRIM
6
LOAD
R
TRIM UP
3
ON/OFF
CONTROL
–OUTPUT
5
Figure 4. Trim Connections To Increase Output Voltage Using Fixed Resistors
Model
UEP-3.3/4500-D12
UEP-3.3/4500-D24
UEP-3.3/4500-D48
Trim Equation
R
T
DOWN
(kΩ) =
R
T
UP
(kΩ) =
2.49(V
O
– 1.27)
3.3 – V
O
3.16
V
O
– 3.3
–16.9
–16.9
UEP-5/3500-D12
UEP-5/3500-D24
UEP-5/3500-D48
R
T
DOWN
(kΩ) =
R
T
UP
(kΩ) =
R
T
DOWN
(kΩ) =
R
T
UP
(kΩ) =
R
T
DOWN
(kΩ) =
R
T
UP
(kΩ) =
2.49(V
O
– 2.527)
–15
5 – V
O
6.292
V
O
– 5
–15
UEP-12/1400-D12
UEP-12/1400-D24
UEP-12/1400-D48
6.34(V
O
– 5.714)
–49.9
12 – V
O
36.23
V
O
– 12
–49.9
UEP-15/1200-D12
UEP-15/1200-D24
UEP-15/1200-D48
7.87(V
O
– 7.136)
–63.4
15 – V
O
56.16
V
O
– 15
–63.4
Accuracy of adjustment is subject to tolerances or resistor values
and factory-adjusted output accuracy. V
O
= desired output voltage.
4
1 1 - 1 8 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
UEP Models
Start-Up Threshold and Undervoltage Shutdown
Under normal start-up conditions, UEP DC/DC Converters will not begin
to regulate properly until the ramping input voltage exceeds the Start-Up
Threshold. Once operating, devices will turn off when the applied voltage
drops below the Undervoltage Shutdown point. Devices will remain off as
long as the undervoltage condition continues. Units will automatically re-start
when the applied voltage is brought back above the Start-Up Threshold. The
hysteresis built into this function avoids an indeterminate on/off condition at
a single input voltage. See Performance/Functional Specifications table for
actual limits.
On/Off Control
The input-side, remote On/Off Control function (pin 4) can be ordered to
operate with either polarity (12 and 15 Volt models only). Positive-polarity
devices (standard, no part-number suffix) are enabled when pin 3 is left open
or is pulled high (+13V to V
IN
applied with respect to –Input, pin 2, (see Figure
2). Positive-polarity devices are disabled when pin 5 is pulled low (0-0.8V
with respect to –Input). Negative-polarity devices are off when pin 3 is open
or pulled high (+2.4V to +10V), and on when pin 3 is pulled low (0-0.5V).
See Figure 3.
1
+INPUT
200k
3
ON/OFF
CONTROL
5V CIRCUIT
Sync Function
(Optional)
Contact DATEL for further information.
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 capac-
itance, and load. The UHE 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.
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 volt-
age 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.
Input Reverse-Polarity Protection
13V CIRCUIT
2
–INPUT
Figure 2. Driving the Positive Polarity On/Off Control Pin
1
+INPUT
3
ON/OFF
CONTROL
If the input-voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If the source is not current limited (<10A) nor the circuit appropriately
fused, it could cause permanent damage to the converter.
Current Limiting
When output increases to 120% to 190% of the rated output current,
the DC/DC converter will go into a current limiting mode. In this condition
the output voltage will decrease proportionately with increases in output cur-
rent, 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. See Performance/Functional Specifications. 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."
2
–INPUT
Figure 3. Driving the Negative Polarity On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate). The drive circuit should be able to sink appropriate
current (see Performance Specs) when activated and withstand appropriate
voltage when deactivated.
Applying an external voltage to pin 3 when no input power is applied to the
converter can cause permanent damage to the converter.
5
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