PRELIMINARY
®
®
INNOVATION and EXCELLENCE
Single Output
UHE Models
High-Density, 1.6" x 2"
2.5-10 Amp, 12-30 Watt DC/DC's
Features
The most I
OUT
available in this format
Small, 1.6" x 2" plastic package;
Standard, 2" x 2" pinout
Output voltages/currents:
1.2/1.5/1.8/2.5V
OUT
@ 10 Amps
3.3V
OUT
@ 7.5 Amps
5V
OUT
@ 5/6 Amps
12V
OUT
@ 2.5 Amps
15V
OUT
@ 2 Amps
Input voltage ranges include:
10-18V (D12) 18-75V (Q48)
10-36V (Q12) 36-75V (D48)
18-36V (D24)
High efficiency (>90%); Stable no-load
operation
On/off control, V
OUT
trim, sense pins
Fully I/O protected; Thermal Shutdown
Fully isolated (1500Vdc); BASIC insulation
UL60950/EN60950 certified; CE marked
Housed in smaller, 1.6" x 2" (41mm x 51mm) packages carrying the standard 2"
x 2" pinout, DATEL’s new UHE Series DC/DC Converters deliver more current/power
(up to 10A/30W) than currently available from either package size. UHE, 12-30W
Series, high-efficiency, isolated DC/DC’s provide output power options ranging from
10 Amps @ 1.2-2.5V to 2 Amps @ 15V. Offering both 2:1 and 4:1 input voltage
ranges (model dependent), UHE’s meet V
IN
requirements from 10 to 75 Volts.
Taking full advantage of the fully synchronous, forward topology, UHE’s boast
outstanding efficiency (many models exceed 90%) enabling full-power operation
to ambient temperatures of +60°C, without air flow. Assembled using fully auto-
mated, SMT-on-pcb techniques, UHE’s provide stable no-load operation, excellent
line (±0.2%) and load (±0.5%) regulation, quick step response (200µsec), and low
output ripple/noise (80mVp-p). All devices feature full I/O fault protection including:
input overvoltage and undervoltage shutdown, precise output overvoltage protection
(a rarity on low-voltage outputs), output current limiting, short-circuit protection, and
thermal shutdown.
All UHE models incorporate a V
OUT
Trim function and a Remote On/Off Control
pin (positive or negative polarity). Low-voltage (1.2-2.5V), 10 Amp models offer
optional sense pins facilitating remote load regulation and current sharing for true
N+1 redundancy. All models are certified to the BASIC-insulation requirements of
UL60950/EN60950, and 48V
IN
models carry the CE mark.
+INPUT
+OUTPUT
+SENSE
SWITCH
CONTROL
➁
➀
➀
–OUTPUT
–SENSE
THERMAL
SHUTDOWN
OPTO
ISOLATION
OVERVOLTAGE
COMPARATOR
➁
–INPUT
PWM
CONTROLLER
UVLO & OVLO
COMPARATORS
ON/OFF
CONTROL
OPTO
ISOLATION
REFERENCE &
ERROR AMP
TRIM
➀
1.2, 1.5, 1.8, 2.5, 3.3 and 5V
OUT
models use the synchronous-rectifier configuration
shown above. 12 and 15V
OUT
models employ a standard forward architecture.
➁
Sense pins are optional with 1.2, 1.5, 1.8, 2.5V
OUT
models ("R" suffix)
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
XHE Series
➀
1 2 - 3 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
Performance Specifications and Ordering Guide
Output
Model
UHE-1.2/10000-D12
UHE-1.2/10000-D24
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%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
V
OUT
(Volts)
1.2
1.2
1.2
1.5
1.5
1.5
1.8
1.8
1.8
2.5
2.5
2.5
3.3
3.3
3.3
5
5
12
12
15
15
I
OUT
(Amps)
10
10
10
10
10
10
10
10
10
10
10
10
7.5
7.5
7.5
5
6
2.5
2.5
2
2
R/N (mVp-p)
➁
Typ.
50
50
50
50
50
50
50
50
50
TBD
TBD
TBD
80
80
80
80
80
TBD
TBD
TBD
TBD
Max.
75
75
75
75
75
75
75
75
75
TBD
TBD
TBD
100
100
100
100
100
TBD
TBD
TBD
TBD
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%
±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
24
48
48
48
48
24
48
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
10-36
18-75
36-75
18-75
36-75
18-36
36-75
18-36
36-75
I
IN
➃
(mA)
TBD
TBD
TBD
35/1600
35/781
35/381
35/1899
35/937
35/462
35/2570
35/1270
35/620
35/920
35/470
35/460
35/590
35/460
TBD
TBD
TBD
TBD
Efficiency
Min.
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
86.7%
TBD
87.5%
TBD
TBD
TBD
TBD
Typ.
TBD
TBD
TBD
78%
79%
80%
79%
80%
81%
81%
82%
84%
88%
87%
88.5%
88%
89%
TBD
TBD
TBD
TBD
Package
(Case,
Pinout)
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P52
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
PRELIMINARY
PRELIM.
UHE-1.2/10000-D48
UHE-1.5/10000-D12
UHE-1.5/10000-D24
UHE-1.5/10000-D48
UHE-1.8/10000-D12
UHE-1.8/10000-D24
UHE-1.8/10000-D48
UHE-2.5/10000-D12
UHE-2.5/10000-D24
UHE-2.5/10000-D48
UHE-3.3/7500-Q12
UHE-3.3/7500-Q48
UHE-3.3/7500-D48
UHE-5/5000-Q48
UHE-5/6000-D48
UHE-12/2500-D24
UHE-12/2500-D48
UHE-15/2000-D24
UHE-15/2000-D48
➀
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➁
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. All models are specified with
an external 0.47µF multi-layer ceramic capacitors installed across their output pins.
➂
Load regulation is specified over load conditions. 1.2-5V
OUT
models are stable and regulate
under no-load conditions. 12/15V
OUT
models have minimum loading requirements. See
Performance/Functional Specifications.
➃
Nominal line voltage, no-load/full-load conditions.
M E C H A N I C A L
S P E C I F I C A T I O N S
2.00
(50.8)
PLASTIC CASE
0.45
(11.43)
Case C32
STANDOFF
0.020 (0.51)
P A R T
N U M B E R
S T R U C T U R E
0.20 MIN
(5.08)
0.040 ±0.001 DIA.
(1.016 ±0.025)
1.800
(45.72)
0.10
(2.54)
U HE
-
3.3
/
7500
-
D48 N R
Output Configuration:
U
= Unipolar
High Efficiency
Nominal Output Voltage:
1.2,1.5, 1.8, 2.5, 3.3, 5, 12 or 15 Volts
Maximum Output Current
in mA
Add "N," "R" or "NR"
suffix as desired
0.200
(5.08)
5
6
1
2
7
8
9
0.100
(2.54)
BOTTOM VIEW
DIMENSIONS ARE IN INCHES (MM)
0.20
(5.08)
1.000 (25.40)
5 EQ. SP. @
0.200 (5.08)
1.60
(40.64)
Input Voltage Range:
D12
= 10-18 Volts (12V nominal)
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
Q12
= 10-36 Volts (24V nominal)
Q48
= 18-75 Volts (48V nominal)
0.400
(10.16)
3
4
I/O Connections
Part Number Suffixes
UHE DC/DC's are designed so an On/Off Control function
with either positive polarity (no suffix), or negative polarity ("N" suffix)
can be added to the pin 4 position. A Remote Sense function ("R" suffix)
can be added to the pins 6 and 8 positions.
No Suffix
On/Off Control function (positive polarity) on pin 4
N
R
On/Off Control function (negative polarity) on pin 4
Remote Sense function optional on pins 6 and 8
for 1.2/1.5/1.8/2.5V Models only
Pin
1
2
3
4
5
6
7
8
9
Function P51
+Input
–Input
No Pin
On/Off Control
No Pin
+Output
–Output
No Pin
Trim
Function P52
+Input
–Input
No Pin
On/Off Control
+Sense*
+ Output
–Output
–Sense*
Trim
* Pins 5 and 8 are
installed for
optional
R-suffix versions of
1.2/1.5/1.8/2.5V
OUT
Models.
2
1 2 - 3 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
UHE Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀➁
Input
Input Voltage Range:
D12 Models
Q12 Models
D24 Models
Q48 Models
D48 Models
Overvoltage Shutdown:
D12 Models
Q12/D24 Models
Q48 Models
D48 Models
Start-Up Threshold:
➂
D12 Models
Q12 Models
D24 Models
Q48 Models
D48 Models
Undervoltage Shutdown:
➂
D12 Models
Q12 Models
D24/Q48 Models
D48 Models
Input Current:
Normal Operating Conditions
Standby Mode (Off, OV, UV)
Input Reflected Ripple Current
Input Filter Type
Reverse-Polarity Protection
On/Off Control:
➃ ➄
"N" Models
10-18 Volts (12V nominal)
10-36 Volts (24V nominal)
18-36 Volts (24V nominal)
18-75 Volts (48V nominal)
36-75 Volts (48V nominal)
18.5-21 Volts (20V typical)
37-40 Volts (38V typical)
77-81 Volts (79V typical)
77-81 Volts (78.5V typical)
9.4-9.8 Volts (9.6V typical)
9.4-10 Volts (9.6V typical)
16.5-18 Volts (17V typical)
16-18 Volts (17V typical)
34-36 Volts (35V typical)
7.5-8.5 Volts (8V typical)
7.0-8.5 Volts (8V typical)
16-17 Volts (16.5V typical)
32.5-35.5 Volts (34.5V typical)
See Ordering Guide
5mA
12µH source impedance
20MHzbandwidth,TBDmAp-p
Pi (0.039µF-2.2µH-2µF)
Brief duration, 5A maximum
On = open or 13V - +V
IN
, I
IN
= 1.6mA max.
Off = 0-0.8V, I
IN
= 2mA max.
On = 0-0.5V, I
IN
= 2mA max.
Off = open or 3.3-5.5V, I
IN
= 1mA max.
Output
Current Limit Inception
(@98%V
OUT
):
10 Amp Models
7.5 Amp Models
6 Amp Models
5 Amp Models
2.5 Amp Models
2.0 Amp Models
Short Circuit Current:
10 Amp Models
7.5 Amp Models
6 Amp Models
5 Amp Models
2.5 Amp Models
2.0 Amp Models
Overvoltage Protection:
1.5V Outputs
1.8V Outputs
2.5V Outputs
3.3V Outputs
5V Outputs
12V Outputs
15V Outputs
Maximum Capacitive Loading:
1.5V Outputs
1.8V Outputs
2.5V Outputs
3.3V Outputs
5V Outputs
12V Outputs
15V Outputs
Temperature Coefficient
Dynamic Load Response:
(50-100% load step to 3% V
OUT
)
Start-Up Time:
V
IN to
V
OUT
On/Off
to
V
OUT
Switching Frequency:
3.3V, D48 Models
3.3V, Q48 Models
5V, D48 Models
5V, Q48 Models
MTBF
➅
Operating Temperature
(Ambient):
➁
Without Derating
1.5/1.8/2.5V Output
3.3V Output
5V Output
12/15V Output
With Derating
Thermal Shutdown
Storage Temperature
TBD Amps
8.2-9.2 Amps
6.6-7.9 Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
2 Amps
2 Amps
2 Amps
TBD Amps
TBD Amps
Output voltage comparator
TBD
TBD
2.85 to 3.4 Volts
3.8 to 4.5 Volts
5.7-6.8 Volts
TBD
TBD
TBD µF
TBD µF
TBD µF
TBD µF
TBD µF
TBD µF
TBD µF
±0.02% per °C.
Dynamic Characteristics
200µsec maximum
TBD
TBD
310kHz (±10%)
220kHz (±10%)
360kHz (±10%)
220kHz (±10%)
Environmental
Bellcore, ground fixed, full power
25°C ambient, TBD million hours
Output
V
OUT
Accuracy
(50% load):
±1.5%, maximum
Minimum Loading for Specification:
➁
1.5V/1.8V/2.5V/3.3V/5V Outputs
No load
12V Outputs
250mA
200mA
15V Outputs
Minimum Loading for Stability:
➆
1.5V/1.8V/2.5V/3.3V/5V Outputs
12V Outputs
15V Outputs
Ripple/Noise
(20MHz BW)
➀ ➅
Line/Load Regulation
Efficiency
Output Voltage Sense Range
➁
Trim Range
➁
Isolation Voltage:
Input-to-Output
Isolation Capacitance
Isolation Resistance
No load
TBD mA
TBDmA
See Ordering Guide
See Ordering Guide
See Ordering Guide
5% maximum
±5%
1500Vdc minimum
650pF
100MΩ
TBD
+60°C
TBD
TBD
To +100°C (see Derating Curves)
TBD
–40 to +120°C
3
XHE Series
1 2 - 3 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
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀➁
Minimum Output Loading Requirements
UHE converters employ a synchronous-rectifier design topology. All models
regulate within spec and 1.2-5V
OUT
models are stable under no-load condi-
tions. 12/15V models employ a traditional forward architecture and require
a minimum 10% loading (250mA for 12V models, 200mA for 15V models)
to achieve their listed regulation specs. 12/15V models also have a mini-
mum-load-for-stability requirement (TBDmA). For 12/15V models, operation
between TBDmA and 10% loading will result in stable operation but regula-
tion may degrade. Operation under no-load conditions will not damage the
12/15V devices; however they may not meet all listed specifications.
Filtering and Noise Reduction
All UHE 15-30 Watt 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. Input capacitors serve as energy-storage
devices to minimize variations in line voltage caused by transient IR drops in
PCB conductors from backplane to the DC/DC. 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 can
recommend potential solutions. Contact our Applications Engineering Group
for additional details.
Input Fusing
Physical
Dimensions
Case Material
Pin Material
Weight:
1.6" x 2" x 0.42" (40.64 x 50.8 x 11.43mm)
Diallyl Phthalate
Brass, solder coated
1.51 ounces (46.9 grams)
Primary to Secondary Insulation Level
Basic
➀
All models are specified with external 0.47µF ceramic output capacitor.
➁
See Technical Notes/Graphs for details.
➂
Applying a voltage to On/Off Control (pin 4) when no input power is applied to the converter
can cause permanent damage.
➃
Output noise may be further reduced with the addition of additional external output
capacitors. See Technical Notes.
➄
The On/Off Control is designed to be driven with open-collector logic or the application
of appropriate voltage levels. Voltages may 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 may degrade.
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12 Models
D24/Q12 Models
D48/Q48 Models
Transient (100msec):
D12 Models
D24/Q12 Models
D48/Q48 Models
On/Off Control (pin 4) Max. Voltages
Referenced to –Input (pin 2)
No Suffix
"N" Suffix
Input Reverse-Polarity Protection
Output Current
23 Volts
42 Volts
81 Volts
50 Volts
50 Volts
100 Volts
+V
IN
+7 Volts
Current must be <5 Amps. Brief
duration only. Fusing recommended.
Current limited. Devices can
withstand sustained output short
circuits without damage.
+100°C
–40 to +120°C
+300°C
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 A-Series UHE 15-30 Watt DC/DC Converters,
you should use slow-blow type fuses with values no greater than the following.
Model
1.5/1.8V
OUT
D12 Models
D24 Models
D48 Models
D12 Models
D24 Models
D48 Models
Q12 Models
Q48 Models
D48 Models
Q48 Models
D48 Models
D24 Models
D48 Models
Fuse Value
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
TBD Amps
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.
2.5V
OUT
3.3V
OUT
T E C H N I C A L
N O T E S
5V
OUT
12/15V
OUT
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating," with
respect to the input. Designers will normally use the –Output (pin 7) 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.
4
1 2 - 3 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
UHE Models
On/Off Control
The input-side, remote On/Off Control function (pin 4) can be ordered to
operate with either polarity. Positive-polarity devices (standard, no part-num-
ber suffix) are enabled when pin 4 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 4 is pulled low (0-0.8V with respect to –Input).
Negative-polarity devices are off when pin 4 open or pulled high (3.3V to
5.5.V), and on when pin 4 is pulled low (0-0.5V). See Figure 3.
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.
Current Limiting
1
+INPUT
13V CIRCUIT
4
ON/OFF
CONTROL
5V CIRCUIT
2
–INPUT
Figure 2. Driving the Positive Polarity On/Off Control Pin
1
+INPUT
4
ON/OFF
CONTROL
2
–INPUT
When output power increases to TBD% to TBD% 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 (see Figure 4). 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."
Typical Current Limiting Characteristics for 3.3V Output
4
Figure 3. Driving the Negative Polarity On/Off Control Pin
Ouput Voltages (Volts)
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 4 when no input power is applied to the
converter can cause permanent damage to the converter.
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 capacitance, 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.
3
2
1
ew
N
me
co
to
V
IN
NOM, V
IN
LO All Models
V
IN
HI D12, D24 Models
V
IN
HI
D48 Models
10
0
2
4
6
8
12
14
3.3 V
OUT
Average Ouput Current (Amps)
0
Figure 4. Current Limiting Characteristics for 3.3V Output
5
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