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
INNOVATION and EX C ELL E N C E
Single Output
UCP Models
UL/EN Approved, "Half-Brick"
50-60 Watt, DC/DC Converters
Features
The high efficiency, low noise and long-term reliability that defines DATEL
DC/DC Converters now comes to you in the standard "half-brick" configuration (2.3"
x 2.4" x 0.5"). All models in our new UCP Series meet UL1950 and EN60950 safety
requirements, including each European country's deviations. A CB Test Certificate/
Report is available. All models have BASIC insulation; guarantee 1500Vdc isolation;
and because they are designed with Class B thermal insulation, satisfy all safety
requirements over their full operating temperatures.
UCP Models are designed for demanding telecom, datacom and networking
applications. Their "semi-synchronous-rectifier" design (400kHz switching) achieves
impressive efficiencies (up to 88%). Output voltages are 3.3, 5, 12 or 15 Volts. Input
voltage ranges are 18-36V ("D24" models) or 36-75V ("D48" models). All "D48"
models meet the Low Voltage Directive (LVD) and carry the CE mark.
For high reliability and affordability, DATEL utilizes high-speed automatic
assembly to construct the UCP's proven SMT-on-pcb designs. All models have been
rigorously qualified (including a 500-hour life test) and EMC characterized. Devices
are housed in metal cases (with non-conductive baseplates) that incorporate
threaded inserts for add-on heat sinks and/or pcb mounting.
UCP's feature input pi filters, input undervoltage and overvoltage lockout, output
current limiting, short-circuit protection, and thermal shutdown. Additionally, all
devices have output trim capability and an on/off control pin that can be ordered
with either polarity or replaced with a sync function. We can easily modify standard-
product UCP's to meet your application-specific requirements.
Figure 1. Simplified Schematic
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Standard "half-brick" configuration
UL1950 and EN60950 safety
approvals (BASIC insulation)
mark for "D48" models
(36-75V inputs)
Fully isolated, 1500Vdc guaranteed
Output voltages: 3.3, 5, 12 or 15 Volts
Input voltage ranges: 18-36V, 36-75V
Full 50/60 Watt output power
Reliable SMT-on-pcb construction
Input under and overvoltage shutdown
Output current limiting and
short-circuit protection
On/off, V
OUT
trim and sense functions
Modifications and customs for OEM's
V
OUT
+V
IN
V
IN
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
COMPARATORS
UVLO & OVLO
ON/OFF
CONTROL
TRIM
+SENSE
SENSE
+V
OUT
10
10
SWITCH
CONTROL
The On/Off Control function can be ordered with either positive (standard) or negative polarity.
It can also be replaced with an optional Sync function.
12V- and 15V-output models have a standard forward architecture in which this FET is replaced
with a Schottky diode.
5 0 - 6 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
Pin
1
2
3
4
5
6
7
8
9
2
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
Output Configuration:
U = Unipolar
Nominal Output Voltage:
3.3, 5, 12 or 15 Volts
CP
/
Input Voltage Range:
D24 = 18-36 Volts (24V nominal)
D48 = 36-75 Volts (48V nominal)
Maximum Output Current
in Amps
Standard Half-Brick Package
Part Number Suffixes
Standard UCP Model DC/DC Converters are supplied with a positive
polarity on their on/off control function (pin 3 open = on). To order
devices with a negative polarity on pin 3 (open = off), add an "N"
suffix to the part number. To replace the on/off function with a sync
function, add an "S" suffix. See Technical Notes for more details.
5
U
12
-
D48
-
N
Add "N" or "S" suffix as desired
0.700
(17.78)
0.400
(10.16)
1.000
(25.40)
1.400
(35.56)
2.40
(60.96)
0.50
(12.70)
1.900
(48.26)
2.000
(50.80)
0.20
(5.08)
(4) THREADED INSERTS
#M3 THD THRU
BOTTOM VIEW
PIN DIAMETERS:
PINS 1-4, 6-8 0.040 0.002 (1.016 0.051)
PINS 5, 9
0.080 0.002 (2.032 0.051)
1
2
3
4
5
6
7
8
9
0.20
(5.08)
0.515
(13.08)
0.20 MIN.
(5.08)
2.30
(58.42)
INSULATED BASE
METAL CASE
Case C12
Optional Heat Sink (Part Number HS-CP)
2.000
(50.80)
2.30
(58.42)
1.900
(48.26)
2.40
(60.96)
0.20
(5.08
0.120 DIA. (3.048)
(4 PLACES)
MATERIAL: BLACK ANODIZED ALUMINUM
4 MOUNTING SCREWS AND 0.009 (0.229)
THERMAL PAD INCLUDED
0.20
(5.08)
0.50
(12.70)
0.10
(2.54)
TOP VIEW
I/O Connections
Function P17
Input
Case
On/Off Control
+Input
+Output
+Sense
Trim
Sense
Output
Typical at T
A
= +25C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth. All models are specified with external 33F, low-ESR,
input capacitors and 10F tantalum in parallel with 1F ceramic output capacitors.
10% to 100% load.
Contact DATEL Applications Engineering for availability of other input voltage ranges such as 9-18V (12V nominal).
Nominal line voltage, no-load/full-load conditions.
UCP-3.3/15-D24
3.3
15
75
150
0.5%
1.0%
24
18-36
75/2515
81%
83%
C12, P17
UCP-3.3/15-D48
3.3
15
75
150
0.5%
1.0%
48
36-75
75/1258
81%
83%
C12, P17
UCP-5/12-D24
5
12
75
120
0.5%
1.0%
24
18-36
75/2924
85%
87%
C12, P17
UCP-5/12-D48
5
12
75
120
0.5%
1.0%
48
36-75
75/1462
84%
86%
C12, P17
UCP-12/5-D24
12
5
75
120
0.5%
1.0%
24
18-36
50/2924
84%
86%
C12, P17
UCP-12/5-D48
12
5
75
120
0.5%
1.0%
48
36-75
50/1420
86%
88%
C12, P17
UCP-15/4-D24
15
4
100
150
0.5%
1.0%
24
18-36
50/2841
86%
88%
C12, P17
UCP-15/4-D48
15
4
100
150
0.5%
1.0%
48
36-75
50/1420
86%
88%
C12, P17
Performance Specifications and Ordering Guide
R/N (mVp-p)
Load
V
OUT
(Volts)
Package
(Case,
Pinout)
Efficiency
Regulation (Max.)
Line
V
IN
Nom.
(Volts)
Range
(Volts)
Model
I
IN
(mA)
Max.
Typ.
Typ.
Min.
I
OUT
(Amps)
Output
Input
UCP Models
5 0 - 6 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
3
Performance/Functional Specifications
Typical @ T
A
= +25C under nominal line voltage and full-load conditions, unless noted.
Input Voltage:
Continuous:
"D24" Models
44 Volts
"D48" Models
88 Volts
Transient (100msec):
"D24" Models
50 Volts
"D48" Models
100 Volts
Input Reverse-Polarity Protection
"D24/D48" Models
Current must be <15/10 Amps. Brief
duration only. Fusing recommended.
Output Overvoltage Protection
3.3V Outputs
4.5 Volts, limited duration
5V Outputs
6.8 Volts, limited duration
12V Outputs
15 Volts, limited duration
15V Outputs
18 Volts, limited duration
Output Current
Current limited. 12/15V devices can
withstand an output short circuit for a
brief duration only. 3.3/5V devices can
withstand output shorts indefinitely.
Storage Temperature
40 to +105C
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 Specifications Table is not implied.
Absolute Maximum Ratings
Input
Input Voltage Range:
"D24" Models
18-36 Volts (24V nominal)
"D48" Models
36-75 Volts (48V nominal)
Overvoltage Shutdown:
"D24" Models
40 Volts
"D48" Models
80 Volts
Start-Up Threshold:
"D24" Models
17 Volts
"D48" Models
35 Volts
Undervoltage Shutdown:
"D24" Models
16 Volts
"D48" Models
34 Volts
Input Current:
Normal Operating Conditions
See Ordering Guide
Standby Mode (Off, OV, UV)
5mA
Input Filter Type
Pi
Reverse-Polarity Protection:
"D24" Models
Brief duration, 15A maximum
"D48" Models
Brief duration, 10A maximum
On/Off Control (Pin 3)
TTL high (or open) = on, low = off
Output
V
OUT
Accuracy (50% load):
3.3V Outputs
1.5%, maximum
5/12/15V Outputs
1%, maximum
Temperature Coefficient
0.04% per C
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage:
Input-to-Output
1500Vdc, minimum
Input-to-Case
1500Vdc, minimum
Output-to-Case
1500Vdc, minimum
Isolation Capacitance
750pF
Isolation Resistance
100M
Current Limiting:
3.3V and 5V Outputs
Hiccup technique, auto-recovery
12V and 15V Outputs
Power-limiting technique, auto-recovery
Overvoltage Protection
Zener/transorb clamp, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step)
200sec max. to 1.5% of final value
Start-Up Time:
V
IN
to V
OUT
50msec
On/Off to V
OUT
30msec
Switching Frequency
400kHz (25kHz)
Environmental
Operating Temperature (Ambient):
Without Derating
40 to +45/50C (Model dependent)
With Derating
to +100C (See Derating Curves)
Case Temperature:
Maximum Allowable
+100C
For Thermal Shutdown
+95C minimum, +105C maximum
Storage Temperature
40 to +105C
These power converters require a minimum 10% output loading to maintain specified
regulation. Operation under no-load conditions will not damage these devices; however they
may not meet all listed specifications.
All models are specified with external 33F, low-ESR, input capacitors and 10F tantalum
in parallel with 1F ceramic output capacitors.
Contact DATEL Applications Engineering for availability of other input voltage ranges
such as 9-18V (12V nominal).
See Technical Notes for details.
Devices may be ordered with the opposite polarity (pin 3 open = off), or the on/off control
function can be replaced with a sync function. See Part Number Suffixes and Technical
Notes for additional information.
Accracy is specified with the sense pins tied directly to their respective output pins.
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
Physical
Dimensions
2.3 x 2.4 x 0.515" (58.4 x 61 x 13.1mm)
Shielding
5-sided
Case Connection
Pin 2
Case Material
Zinc with a non-conductive, epoxy-based
black enamel finish and plastic baseplate
Pin Material
Brass, solder coated
Weight
5.3 ounces (149 grams)
5 0 - 6 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
4
Temperature Derating and Electrical Performance Curves
O
u
tp
u
t
P
o
w
e
r (W
a
t
ts
)
Ambient Temperature (C)
40 0 30 35 40 45
50
55
60
65
70
75
80
85
90
95 100
60
50
40
30
20
10
0
Natural Convection Cooling
150 Linear Feet Per Minute
300 Linear Feet Per Minute
O
u
tp
u
t
P
o
w
e
r (W
a
t
ts
)
Ambient Temperature (C)
40 0 30 35 40
45
50
55
60
65
70
75
80
85
90
95 100
60
50
40
30
20
10
0
Natural Convection Cooling
150 Linear Feet Per Minute
300 Linear Feet Per Minute
O
u
tp
u
t
P
o
w
e
r (W
a
t
ts
)
Ambient Temperature (C)
40
0 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
60
50
40
30
20
10
0
Natural Convection Cooling
150 Linear Feet Per Minute
300 Linear Feet Per Minute
O
u
tp
u
t
P
o
w
e
r (W
a
t
ts
)
Ambient Temperature (C)
40 0 30 35 40 45
50
55
60
65
70
75
80
85
90
95 100
60
50
40
30
20
10
0
Natural Convection Cooling
150 Linear Feet Per Minute
300 Linear Feet Per Minute
D24 Models (60 Watts)
Figure 2a. Temperature Derating Without Heat Sink
Figure 3a. Temperature Derating Without Heat Sink
Figure 2b. Temperature Derating With HS-CP Heat Sink
Figure 3b. Temperature Derating With HS-CP Heat Sink
D48 Models (60 Watts)
UCP Models
5 0 - 6 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
5
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating."
Designers will usually use the Output (pin 9) as the ground/return of the
load circuit. You can, however, use the +Output (pin 5) as ground/return to
effectively reverse the output polarity.
Filtering and Noise Reduction
All UCP DC/DC Converters achieve their rated ripple and noise specifications
using the external input and output capacitors specified in the Performance/
Functional Specifications table. In critical applications, input/output noise
may be further reduced by installing additional 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 voltage
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 will be
happy to recommend 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 UCP DC/DC Converters, you should use slow-
blow type fuses with values no greater than the following.
V
IN
Range
Fuse Value
"D24" Models
6 Amps
"D48" Models
3 Amps
Start-Up Threshold and Undervoltage Shutdown
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/Lockout 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 obviously avoids any
unstable on/off situations at a single voltage.
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval between the time at which a
ramping 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
capacitance, and the slew rate and final value of the input voltage as it
appears to the converter.
The On/Off to V
OUT
start-up time assumes the converter has its nominal input
voltage applied but is turned off via the On/Off Control. 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.
On/Off Control (Standard)
The On/Off Control pin (pin 3) may be used for remote on/off operation.
As shown in Figure 4, the control pin is referenced to the Input (pin 1) and
has an internal pull-up resistor (75k
and 100k
respectively for "D24" and
"D48" models) to the +Input (pin 4). The standard UCP converter is designed
so that it is enabled when the control pin is left open and disabled when the
control pin is pulled low (to less than +0.8V relative to Input). When left
open, pin 3 is pulled up to approximately 5V on "D24" models and 8V on
"D48" models.
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should obviously be able to sink approximately
1mA when activated and withstand more than 10 Volts 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. The on/off
control function, however, is designed such that the converter can be
disabled (pin 3 pulled low) while input power is ramping up and then
"released" once the input has stabilized. Under these circumstances, it takes
approximately 30ms for the output of the fully loaded DC/DC to ramp up and
settle to within rated accuracy.
For UCP converters configured with the negative-polarity option on the On/
Off Control pin ("N" suffix added to part number), operation is exactly
opposite to that described above.
Synchronization (Optional)
In critical applications employing multiple switching DC/DC converters, it may
be desirable to intentionally synchronize the switching of selected converters
(so the system noise can be reduced with notch filtering) or to purposely
desynchronize the converters (to lessen the current-carrying requirements on
intermediate dc buses). UCP DC/DC Converters have been designed so that
the On/Off Control function on pin 3 can be replaced with a Sync function (add
"S" suffix to part number). This change has to be implemented by DATEL
during the product assembly process. Contact our Applications Engineering
Group for additional details.
To synchronize the switching of multiple UCP converters configured with the
Sync function, an external clock can be applied to pin 3 of each converter.
The clock should be a square wave referenced to Input (logic high = +3.5 to
+5 Volts, 800A max.; logic low = 0 to +1 Volt, 800A max.) with a maximum
1sec "high" duration. The frequency of the synchronizing clock should be
higher than that of any individual converter. Therefore, it should be approxi-
mately 430kHz.
Output Trimming
V
OUT
may be trimmed 5% via a single trimpot or fixed resistor. As shown in
Figure 5, the trimpot should be connected between +Output (pin 5) and
Output (pin 9) with its wiper connected to Trim (pin 7). A trimpot can also be
used to determine the value of a single fixed resistor which can be connected
between pin 7 (Trim) and pin 5 (+Output) to trim "down" the output voltage, or
between pins 7 (Trim) and 9 (Output) to trim "up" the output voltage, as
shown in Figure 6. Fixed resistors should be metal-film types with absolute
TCR's less than 100ppm/C to ensure stability.
T E C H N I C A L N O T E S
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
ISO 9001
ISO 9001
R E G I
S T E R E D
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH Mnchen, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com Email: sales@datel.com
Data Sheet Fax Back: (508) 261-2857
DS-0437 2/00
INNOVATION and EX C ELL E N C E
The Sense Pins
Switching DC/DC converters incorporate a feedback loop that continuously
monitors the difference between the output voltage and an internal precision
reference. In situations in which load currents and/or conductor impedances
are relatively high, there may be unacceptable voltage drops between the
converter output and its load. The purpose of the Sense pins (pins 6 and 8)
is to monitor and feed back the output voltage at the load, rather than at the
output of the converter, and to adjust the converter output as necessary to
maintain the load voltage at its desired level.
The Sense pins (which the converter output sees as having an effective 10
Ohm line impedance) should be connected across the output voltage at the
load and not at the output of the converter. See Figure 7. The Sense pins
then function similar to the Trim pin, and they effectively have the same 5%
compensation range. If, for example, the combination of load current and line
impedance causes a 5V output to drop to +4.75V at its load (a 5% drop), the
sense function will compensate by raising the output voltage at the converter
to +5.25V. If the load voltage drops to +4.5V, the sense function will not be
able to compensate for the full drop, and other measures (like reducing line
impedance) must be taken.
If you are using both the external Trim and Sense functions, you must not
attempt to force the converter output voltage more than 5% above its initial,
"untrimmed" value.
When UCP DC/DC Converters are tested for output accuracy during final
test, the Sense pins are connected directly to their respective output pins.
+INPUT
INPUT
TRIM
LOAD
20k
5-10
Turns
+OUTPUT
4
1
5
9
7
OUTPUT
Trim
Down
Trim Up
4
1
LOAD
+INPUT
INPUT
+OUTPUT
TRIM
5
9
7
OUTPUT
Figure 5. Trim Connections Using a Trimpot
Figure 6. Trim Connections Using Fixed Resistors
3
1
4
+INPUT
INPUT
ON/OFF
CONTROL
Figure 4. Driving the On/Off Control Pin
+INPUT
INPUT
LOAD
+OUTPUT
4
1
5
9
8
OUTPUT
+SENSE
SENSE
6
Figure 6. Sense Connections Made at the Load
Case Connection
Unlike most other DC/DC converters, UCP DC/DC's do not have their metal
case connected to one of their input pins. The "uncommitted" case is
connected to pin 2 which, depending upon your system configuration, should
be connected to either +Input (pin 4), Input (pin 1), Output (pin 9), or earth
ground.
5 0 - 6 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
X C P S e r i e s
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