Single Output
UHR Models
Ruggedized, 2" x 2"
16-20 Watt, DC/DC Converters
Figure 1. Simplified Schematic
DATEL's XHR Series DC/DC converters deliver a measure of cost-effective long-
term reliability not previously available in commercial, off-the-shelf power converters.
These DC/DC's combine the high-efficiency and wide-input-range of DATEL's
venerable XWR Series DC/DC's with a newly developed, all metal-ceramic, construc-
tion technique that eliminates the need for thermally-conductive potting compounds.
All electrical components are surface-mount soldered to a 60 mil (0.06"/1.52mm)
ceramic baseplate for low junction-to-case thermal resistance. Package pins, instead
of traditional butt soldering, are soldered through the baseplate via pre-cut holes.
Pre-cutting prior to firing, as opposed to laser cutting after firing, eliminates micro
cracks. The tin plated, steel cover is soldered to the baseplate creating a level of
hermiticity not available in other commercial power modules. The bottom of the
baseplate has a conductive layer that provides 6-sided shielding. It is also insulated
so pc-card runs can pass beneath the package.
UHR Models are the single-output devices in the XHR Series. They offer outputs
of 3.3, 5, 12 or 15 Volts. The ultra-wide (4:1) input voltage ranges are either 9-36V
("D12" models) or 18-72V ("D48" models). Line and load regulation are a tight ±0.3%
max. and ±0.5% max., respectively. All devices guarantee that output ripple/noise will
be less than 100mVp-p. Isolation voltage is guaranteed to be at least 750Vdc.
UHR devices carry industry-standard pinouts in packages whose outside
dimensions are only slightly larger than the 2" x 2" standard. They can be subjected
to mutually-agreed-upon, high-rel screening programs as necessary to satisfy your
system's reliability requirements. Contact DATEL for additional details.
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
Features
INNOVATION and EX C ELL E N C E
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Ruggedized design
All metal-ceramic construction
Low junction-to-baseplate thermal
impedance
No potting compounds
3.3, 5, 12 or 15 Volt outputs
Ultra-wide input voltage ranges:
9-36V or 18-72V
Industry-standard pinouts
No external components required
Tight regulation, low ripple/noise
Guaranteed efficiencies to 82%
V
OUT
trim and on/off control
Modifications and customs for OEM's
+V
OUT
+V
IN
V
IN
REFERENCE &
ERROR AMP
OPTO
ISOLATION
PWM
CONTROLLER
V
OUT
2
Function P6
+Input
Input
No Pin
On/Off Control
No Pin
+Output
Common
Trim
Pin
1
2
3
4
5
6
7
8
I/O Connections
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
T E M P E R A T U R E D E R A T I N G
XHR Series
1 6 - 2 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
Performance Specifications and Ordering Guide
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
20% to 100% load.
Nominal line voltage, no-load/full-load conditions.
UHR-3.3/4850-D12
3.3
4850
75
±0.5%
±1.0%
24
9-36
45/916
75%
C8, P6
UHR-3.3/4850-D48
3.3
4850
100
±1.0%
±1.0%
48
18-72
25/440
78%
C8, P6
UHR-5/4000-D12
5
4000
100
±0.3%
±0.5%
24
9-36
25/1060
79%
C8, P6
UHR-5/4000-D48
5
4000
100
±0.3%
±0.5%
48
18-72
25/526
80%
C8, P6
UHR-12/1650-D12
12
1650
100
±0.3%
±0.5%
24
9-36
30/1050
81%
C8, P6
UHR-12/1650-D48
12
1650
100
±0.3%
±0.5%
48
18-72
25/514
81%
C8, P6
UHR-15/1300-D12
15
1300
100
±0.3%
±0.5%
24
9-36
30/1000
82%
C8, P6
UHR-15/1300-D48
15
1300
100
±0.3%
±0.5%
48
18-72
30/495
82%
C8, P6
Ripple/Noise
(mVp-p, Max.)
V
OUT
(Volts)
Package
(Case,
Pinout)
Efficiency
(Min.)
Regulation (Max.)
Line
V
IN
Nom.
(Volts)
Range
(Volts)
Model
I
OUT
(mA, Max.)
I
IN
(mA, Max.)
Load
Output
Input
O
u
tp
u
t
P
o
w
e
r (W
a
t
ts
)
Ambient Temperature (°C)
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
A
B
40 0 35 40 45 50 55 60 65 70 75 80 85 90 95
UHR-3.3/4850-D12 A
UHR-3.3/4850-D48 A
UHR-5/4000-D12 B
UHR-5/4000-D48
B
UHR-12/1650-D12 C
UHR-12/1650-D48 C
UHR-15/1300-D12 D
UHR-15/1300-D48 E
C
E
D
Output Configuration:
U = Unipolar
Nominal Output Voltage:
3.3, 5, 12 or 15 Volts
Maximum Output Current
in mA
Input Voltage Range:
D12 = 9-36 Volts (24V nominal)
D48 = 18-72 Volts (48V nominal)
Metal-Ceramic Construction
Wide Range Input
5
U HR
4000 D12
-
/
-
0.040 ±0.002 DIA.
(1.016 ±0.051)
2.00
(50.80)
0.45
(11.43)
0.30
(7.62)
BOTTOM VIEW
1.800
(45.72)
0.400
(10.16)
1
2
4
8
5
6
7
METAL CASE
CERAMIC
BASEPLATE
2.06
(52.32)
2.06
(52.32)
0.06
(1.52)
0.13
(3.30)
0.43
(10.92)
1.200
(30.48)
3 EQ. SP. @
0.400 (10.16)
0.200
(5.08)
0.100
(2.54)
Case C8
Notes:
For "D12" models,
the case is connected to
pin 2 (V
IN
).
For "D48" models, the case
is connected to pin 1 (+V
IN
).
3
UHR Models
1 6 - 2 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
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full load conditions unless noted.
Input
Input Voltage Range:
"D12" Models
9-36 Volts (24V nominal)
"D48" Models
18-72 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type
LC
Overvoltage Shutdown:
"D12" Models
40 Volts
"D48" Models
76 Volts
Reverse-Polarity Protection
Yes (Instantaneous, 10A maximum)
On/Off (Sync) Control (Pin 4)
TTL high = off, low (or open) = on
Output
V
OUT
Accuracy (50% load)
±1%, maximum
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage
750Vdc, minimum
Isolation Capacitance
550pF
Current Limiting
Auto-recovery
Overvoltage Protection
Zener/transorb clamp, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step)
200µsec max. to ±1.5% of final value
Switching Frequency
165kHz (±10kHz)
Environmental
Operating Temperature (Ambient):
Without Derating
40 to +35/40/45/50°C (Model dependent)
With Derating
to +95°C (See Derating Curves)
Maximum Baseplate Temperature
+95°C
Storage Temperature
55 to +125°C
Physical
Dimensions
2.06" x 2.06" x 0.45" (52 x 52 x 11.4mm)
Shielding
6-sided
Case Connection:
"D12" Models
Pin 2 (V
IN
)
"D48" Models
Pin 1 (+V
IN
)
Case Material:
Cover
Tin plated steel
Baseplate
Ceramic (0.06"/1.52mm)
Pin Material
Brass, solder coated
Weight
1.7 ounces (49.5 grams)
These converters require a minimum 20% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices; however they may not
meet all listed specifications.
Application-specific input/output filtering can be recommended and perhaps added
internally upon request. Contact DATEL Applications Engineering for details.
Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
Floating Outputs
All outputs are floating. Users may ground either the Common (pin 7) for
normal usage or the positive side (+Output, pin 6) to effectively reverse the
output polarity.
Filtering and Noise Reduction
All UHR 16-20 Watt DC/DC Converters achieve their rated ripple and noise
specifications without the use of external input/output capacitors. In critical
applications, input/output noise may be further reduced by installing
electrolytic capacitors across the input terminals and/or low-ESR tantalum or
electrolytic capacitors across the output terminals. The caps should be
located as close to the power converters as possible. Typical values are
listed below. In many applications, using values greater than those listed will
yield better results.
In critical, space-sensitive applications, DATEL may be able to tailor the
internal input/output filtering of these units to meet your specific require-
ments. Contact our Applications Engineering Group for additional details.
To Reduce Input Ripple
"D12" Models
20µF, 50V
"D48" Models
20-50µF, 100V
To Reduce Output Ripple
3.3V Outputs
100µF, 6V, Low ESR
5V Outputs
47µF, 10V, Low ESR
12/15V Outputs
22µF, 20V, Low ESR
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 Voltage:
"D12" Models
44 Volts
"D48" Models
80 Volts
Input Reverse-Polarity Protection
Current must be <10A. Brief duration
only. Fusing recommended.
Output Overvoltage Protection:
3.3V Outputs
No protection
5V Outputs
6.8 Volts, limited duration
12V Outputs
15 Volts, limited duration
15V Outputs
18 Volts, limited duration
Output Current
Current limited. Max. current and
short-circuit duration model
dependent
Storage Temperature
55 to +125°C
Lead Temperature (soldering, 10sec.)
+300°C
T E C H N I C A L N O T E S
4
XHR Series
1 6 - 2 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
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For DATEL UHR
16-20 Watt DC/DC Converters, you should use slow-blow type fuses with
values no greater than the following:
V
IN
Range
Fuse Value
"D12"
4A
"D48"
2A
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the
converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection,
enables the converter. Control voltages should be referenced to pin 2
(Input). Applying a voltage to the Control pin when no input power is
applied to the converter can cause permanent damage to the converter.
Synchronization
In certain applications employing multiple UHR converters and also
demanding minimal noise levels, some improvements may be had by
synchronizing the switching of the various converters. The synchronizing
clock should be applied to pin 4 (Control) of each device. It should be a
square wave with a maximum 1µsec "high" duration and an amplitude
between +2V and +5V (see On/Off Control) referenced to pin 2 (Input).
The frequency of the synchronizing clock should be higher than that of any
individual converter. Therefore, it should be 180kHz ±5kHz.
Output Trimming
V
OUT
may be trimmed ±5% via a single external trimpot or fixed resistor. The
trimpot should be connected as shown in Figure 2a with its wiper connected
to pin 8 (Trim). A trimpot can be used to determine the value of a single fixed
resistor which should be connected as shown in Figure 2b. Connect the
resistor between pin 8 (Trim) and pin 6 (+Output) to trim "down" the output
voltage. Connect the resistor between pins 8 and 7 (Common) to trim "up"
the output voltage. Fixed resistors should be metal-film types with absolute
TCR's less than 100ppm/°C to ensure stability.
DS-0355 10/98
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 München, 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
INNOVATION and EX C ELL E N C E
®
®
Trim Down
Trim Up
+INPUT
INPUT
OUTPUT
TRIM
COMMON
1
2
6
7
8
LOAD
20k
5-10
Turns
Trim
Down
Trim Up
+INPUT
INPUT
OUTPUT
TRIM
COMMON
1
2
6
7
8
LOAD
Figure 2a. Trim Connections Using a Trimpot
Figure 2b. Trim Connections Using Fixed Resistors
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