UNR-2.5/10-D5T [ETC]
Analog IC ; 模拟IC\n
ETC 
®
®
INNOVATION and EXCELLENCE
Single Output
UNR Series
Non-Isolated, 1.2/1.5/1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
As supply voltages trend lower and load currents increase, centralized power
becomes more impractical. The tight accuracy, low noise and quick transient
response demanded by today's low voltage CPU's, ASIC's and DSP's make power
processing at the point of use the only viable solution. The UNR 12-33W series
provides a complete line of non-isolated DC/DC converters to satisfy this require-
ment. With input voltages of 5V (-D5 models) and 12V (-D12 models) these convert-
ers offer standard output voltages of 1.2, 1.5, 1.8, 2.5 and 3.3 Volts and up to
10 Amps of output current in both through-hole and surface-mount 1" x 2" metal
cases.
Features
Input ranges of 4.75-5.5V or 10.8-13.6V
Output voltages of 1.2/1.5/1.8/2.5/3.3V
8 and 10 Amp output current models
VOUT user-trimmable from 1.28V to 3.6V
Non-isolated, full synchronous topology
1" x 2" through-hole or SMT package
With on/off control and output voltage trim capability as standard features, these
non-isolated converters exploit full synchronous rectification, planar magnetics, and
100% automated assembly to deliver high efficiencies (to 91%) and low noise at
low cost.
Gull-wing leads/standard reflow for SMT
High efficiency to 91%; Low noise
340kHz switching; Planar magnetics
These versatile DC/DC’s are fully line and load regulated. They feature quick
transient response (50µsec), user-optional on/off control (for power sequencing),
and output overcurrent detection and shutdown ("hiccup" technique with auto-
recovery). Their impressive guaranteed efficiencies enable them to deliver fully rated
output power from –40 to +50/55°C (ambient) without supplemental cooling.
If your high current requirements have made the use of inefficient linear regula-
tors impractical, take a look at one of DATEL’s new switching buck regulators. Their
high efficiency, ease-of-use, long-term reliability, and overall cost effectiveness will
impress you. Safety agency approvals and EMC characterizations are currently in
progress.
–40 to +40/50/60°C ambient operation with
no derating
Remote on/off control; Output overcurrent
detection
IEC950/EN60950/UL1950 approval
+VIN
+VOUT
INPUT
RETURN
OUTPUT
RETURN
➀
LOGIC
GROUND
VOLTAGE
BOOST
OVERCURRENT
DETECTION
+VCC
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
V
OUT
TRIM
➀ -D5 models only.
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
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5
&
1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Series
➀
Performance Specifications and Ordering Guide
Output
Input
Package
R/N (mVp-p)
➀
Regulation (Max.)
Load
0.5ꢀ
Efficiency
V
OUT
I
OUT
V
IN Nom.
Range
(Volts)
I
IN
➀
(Case,
Model
(Volts)
1.2
1.2
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
(Amps)
10
10
10
10
10
10
10
10
8
Typ.
TBD
TBD
TBD
TBD
70
Max.
TBD
TBD
TBD
TBD
100
80
Line
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.1ꢀ
0.25ꢀ
0.25ꢀ
0.1ꢀ
0.1ꢀ
0.25ꢀ
0.25ꢀ
➀
(Volts)
(mA/A)
Min.
TBD
TBD
TBD
TBD
82ꢀ
82ꢀ
85ꢀ
85ꢀ
88ꢀ
88ꢀ
86ꢀ
86ꢀ
86ꢀ
86ꢀ
86ꢀ
86ꢀ
Typ.
TBD
TBD
TBD
TBD
86ꢀ
86ꢀ
89ꢀ
89ꢀ
92ꢀ
92ꢀ
91ꢀ
91ꢀ
91ꢀ
91ꢀ
89ꢀ
89ꢀ
Pinout)
UNR-1.2/10-D5T
UNR-1.2/10-D5SM
UNR-1.5/10-D5T
UNR-1.5/10-D5SM
UNR-1.8/10-D5T
UNR-1.8/10-D5SM
UNR-2.5/10-D5T
UNR-2.5/10-D5SM
UNR-3.3/8-D5T
5
5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
10.8-13.6
10.8-13.6
4.75-5.5
4.75-5.5
10.8-13.6
10.8-13.6
TBD
C16A2, P23
C18, P25
0.5ꢀ
0.5ꢀ
TBD
5
TBD
C16A2, P23
C18, P25
0.5ꢀ
5
TBD
0.5ꢀ
5
150/4190
150/4190
150/5620
150/5620
100/5470
100/5470
50/2420
50/2420
150/7250
150/7250
90/3090
90/3090
C16A2, P23
C18, P25
40
0.5ꢀ
5
75
100
100
80
0.5ꢀ
5
C16A2, P23
C18, P25
75
0.5ꢀ
5
40
0.5ꢀ
5
C16A1, P23
C18, P25
UNR-3.3/8-D5SM
UNR-3.3/8-D12T
UNR-3.3/8-D12SM
UNR-3.3/10-D5T
UNR-3.3/10-D5SM
UNR-3.3/10-D12T
UNR-3.3/10-D12SM
8
40
80
0.5ꢀ
5
8
40
100
100
80
0.875ꢀ
0.875ꢀ
0.5ꢀ
12
12
5
C16A1, P23
C18, P25
8
40
10
10
10
10
40
C16A2, P23
C18, P25
50
100
120
120
0.5ꢀ
5
70
0.875ꢀ
0.875ꢀ
12
12
C16C2, P23
TBD, P25
70
➀ Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. Output noise may be further
reduced by installing additional external output caps. See I/O Filtering and Noise Reduction.
➀ These devices have no minimum-load requirements and will regulate under no-load conditions.
➀ Nominal line voltage, no-load/full-load conditions.
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless
otherwise noted. All models are tested and specified with an external 22µF output capacitor
with a 200mΩ ESR and a 470µF input capacitor with 6Arms ripple-current rating and 20mΩ
ESR. See I/O Filtering and Noise Reduction for more details.
M E C H A N I C A L S P E C I F I C A T I O N S
P A R T N U M E R S T R U C T U R E
U NR - 1.8 10- D5 SM
/
2.00
(50.80)
METAL CASE
Output Configuration:
U = Unipolar
SEE
NOTES
Case C16A1, A2,C2
INSULATED BASE
Packaging:
T = Through-Hole Package
SM = Surface-Mount Package
Non-Isolated
Nominal Output Voltage:
1.2, 1.5,1.8, 2.5 or 3.3 Volts
0.20 MIN
(5.08)
Input Voltage Range:
0.10
(2.54)
1.800
(45.72)
Maximum Rated Output
D5 = 4.75 to 5.5 Volts (5V nominal)
D12 = 10.8 to 13.6 Volts (12V nominal)
Current in Amps
1
2
3
4
5
0.300
(7.62)
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
1.00
(25.40)
6
7
0.100
(2.54)
0.110
(2.79)
BOTTOM VIEW
0.10
DIMENSIONS IN INCHES (MM)
0.10
(2.54)
(2.54)
4
9
8
7
6
5
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
CASE C16A1
3
2
CASE HEIGHT: 0.39 (9.91)
PIN DIAMETERS:
1.00
(25.40)
Case C18
0.500
(12.70)
PINS 1-7:
0.040 0.002 (1.016 0.051)
0.300
(7.62)
1
CASE C16A2
CASE HEIGHT: 0.39 (9.91)
PIN DIAMETERS:
PINS 1-2, 4:
PINS 3, 5-7:
I/O Connections
TOP VIEW
0.10
(2.54)
Pin
Function P23
Function P25
Logic Ground
On/Off Control
N.C.
0.040 0.002 (1.016 0.051)
0.062 0.002 (1.575 0.051)
1
2
3
4
5
6
7
8
9
Logic Ground
On/Off Control
+Output
2.00
(50.80)
0.110
(2.79)
CASE C16C2
CASE HEIGHT: 0.48 (12.19)
PIN DIAMETERS:
PINS 1-2, 4:
PINS 3, 5-7:
0.015
(0.38)
Trim
N.C.
0.060
(1.52)
0.040 0.002 (1.016 0.051)
0.062 0.002 (1.575 0.051)
0.43
(10.92)
Output Return
Input Return
+Input
+Output
Trim
Output Return
Input Return
+Input
INSULATED BASE
METAL CASE
DIMENSIONS ARE IN INCHES (MM)
0.015
(0.38)
No Pin
0.055
(1.40)
No Pin
2
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5
&
1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Models
Physical
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted.
➀
Shielding
5 sided
Input
Case Connection
Case Material
Input/Output Return
Input Voltage Range
D5 Models
3.0 to 3.6 Volts (3.3V nominal)
4.75-5.5 Volts (5V nominal)
Corrosion-resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
D12 Models
10.8-13.6 Volts (12V nominal)
Input Current:
Pin Material
Copper, tin plated
Normal Operating Conditions
Standby/Off Mode
See Ordering Guide
3.6mA typical
➀ All models are tested and specified with an external 470µF input capacitor with a 20mΩ
ESR and a 6Arms ripple-current rating, as well as a 22µF output capacitor with a 200mΩ ESR.
See I/O Filtering and Noise Reduction for more details. These devices have no minimum-load
requirements and will regulate under no-load conditions. Listed specifications apply for both
"T" and "SM" models as appropriate.
➀ See Output Overcurrent Detection for details.
➀ See On/Off Control for details.
Input Ripple Current:
1.8/2.5V Models
150mAp-p
100mAp-p
150mAp-p
110mAp-p
250mAp-p
3.3/8 -D5 Models
3.3/10V -D5 Models
3.3/8 -D12 Models
3/3/10 -D12 Models
➀ See Output Voltage Trimming for details.
➀ For all models, output noise can be further reduced with the installation of additional
external output capacitors. See I/O Filtering and Noise Reduction for details.
➀ See Start-Up Time for details.
Input Filter Type
Capacitive
None
➀ See Temperature Derating for details.
Overvoltage Protection
Reverse-Polarity Protection
None
Absolute Maximum Ratings
On/Off Control: ➀
Functionality
TTL high (or open) = on, low = off
+0.8-2.0 Volts (1.5V typical)
Input Voltage:
Continuous:
Logic Threshold
D5 Models
D12 Models
Transient (100msec)
7 Volts
15 Volts
15 Volts
Output
VOUT Accuracy (50ꢀ load):
1.8VOUT Models
2ꢀ of VOUT maximum
1ꢀ of VOUT maximum
Input Reverse-Polarity Protection
Input/Output Overvoltage Protection
Output Current
None
None
2.5/3.3VOUT Models
VOUT Trim Range ➀
Trim pin tied to +Output:
Current limited. Devices can
withstand a sustained output
short circuit without damage.
VOUT = 1.52 Volts or less
VOUT = 3.6 Volts or greater
Trim pin tied to Output Return
Temperature Coefficient
Ripple/Noise (20MHz BW) ➀
Line/Load Regulation
Efficiency
0.02ꢀ per °C
Storage Temperature
–40 to +105°C
+300°C
See Ordering Guide
See Ordering Guide
See Ordering Guide
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.
Overcurrent Protection: ➀
Technique
"Hiccup" with auto-recovery
110-180ꢀ of rated current
Overcurrent Detection Point
Average Short Circuit Current:
D5 Models
T E C H N I C A L N O T E S
1 Amp typical, 3 Amps maximum
4 Amp typical, 6 Amps maximum
D12 Models
Return Current Paths
Dynamic Characteristics
These are non-isolated DC/DC converters. The Input Return, Output Return
and Logic Ground pins are all connected together internally. To the extent
possible, all input and load currents should be returned through the Input
Return and Output Return, respectively (via low-impedance runs). Any con-
trol signals applied to the On/Off Control pin should be referenced to Logic
Ground. The internal trace leading to Logic Ground is not designed to carry
high current. Consequently, devices should never be installed in a manner
that results in high current flow through Logic Ground (i.e., the Input/Output
Return pins should never be left open or connected via high-impedance
paths).
Transient Response (50-100ꢀ load):
1.8/2.5VOUT Models
60µsec to 2.5ꢀ of final value
50µsec to 2.5ꢀ of final value
50µsec to 1ꢀ of final value
50µsec to 2.5ꢀ of final value
3.3VOUT -D5 Models
3.3/8 -D12 Models
3.3/10 -D12 Models
Start-Up Time: ➀
VIN to VOUT
25/30msec (1.8/2.5VOUT models)
25/30msec (1.8/2.5VOUT models)
On/Off to VOUT
Switching Frequency
300kHz ( 30kHz)
Environmental
Operating Temperature (Ambient): ➀
Without Derating
See Derating Curves
to +100°C (See Derating Curves)
–40 to +105°C
I/O Filtering and Noise Reduction
With Derating
All models in the UNR 12-33W Series converters are tested and specified
with external 470µF input capacitors (20mΩ ESR, 6Arms ripple-current
rating) and external 22µF output capacitors (200mΩ ESR). In critical applica-
tions, input/output ripple/noise may be further reduced by installing additional
I/O caps.
Storage Temperature
Physical
Dimensions:
D5 Through-Hole Models
D5 Surface-Mount Models
D12 Through-Hole Models
D12 Surface-Mount Models
2" x 1" x 0.39" (51 x 25 x 9.9mm)
2" x 1" x 0.43" (51 x 25 x 10.9mm)
2" x 1" x 0.48" (51 x 25 x 12.2mm)
2" x 1" x TBD" (51 x 25 x 12.7mm)
3
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5
&
1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Series
External input capacitors serve primarily as energy-storage elements. They
should be selected for bulk capacitance (at appropriate frequencies), low
ESR, and high rms-ripple-current ratings. Input capacitors compensate for
I·R drops on input lines and power sources. Providing a solid input voltage
will greatly reduce the need for capacitors. The switching nature of modern
DC/DC converters requires that dc input voltage sources have low ac imped-
ance, as highly inductive source impedances can affect system stability.Your
specific system configuration may necessitate additional considerations.
+INPUT
RPULL UP
D5 Models 4.99kΩ
D12 Models 12.4kΩ
ON/OFF
CONTROL
LOGIC
GROUND
Output ripple/noise (also referred to as periodic and random deviations or
PARD) can be reduced below published specifications by using filtering
techniques, the simplest of which is the installation of additional external
output capacitors. Output capacitors function as true filter elements and
should be selected for bulk capacitance, low ESR, and appropriate frequency
response. Any scope measurements of PARD should be made directly at the
DC/DC output pins with scope probe ground less than 0.5" in length.
Figure 2. Driving the On/Off Control Pin
Dynamic control of the on/off function is best accomplished with a mechanical
relay or open-collector/open-drain drive circuit (optically isolated if appropri-
ate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
All external capacitors should have appropriate voltage ratings and be
located as close to the converters as possible. Temperature variations for all
relevant parameters should be taken into consideration.
Applying an external voltage to the On/Off Control pin 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 (control pin pulled low) while input voltage is ramping up and
then "released" once the input has stabilized. The time duration between the
point at which the converter is released and its fully loaded output settles
to within specified accuracy can be found in the Performance/Functional
Specifications Table. See Start-Up Time for more details.
The most effective combination of external I/O capacitors will be a function
of your line voltage and source impedance, as well as your 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 Engi-
neering Group for additional details.
Start-Up Time
Input Fusing
The VIN to VOUT Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specified input voltage
range (4.75V for D5 models, 10.8V for D12 models) and the fully loaded
output voltage enters and remains within it specified accuracy band. Actual
measured times will vary with heavy capacitive loading.
UNR 12-33W Series converters are not internally fused. 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 UNR 12-33W Series DC/DC converters, you should use either slow-
blow or normal-blow fuses with values no greater than the following.
The On/Off to VOUT Start-Up Time assumes the converter is turned off via
the Remote On/Off Control with the nominal input voltage already applied
to the converter. 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. See Typical Performance
Curves for details
Output Voltage
1.8V Models
Fuse Value
9 Amps
2.5V Models
12 Amps
12.5 Amps
16 Amps
6 Amps
3.3/8-D5 Models
3.3/10-D5 Models
3.3/8-D12 Models
3.3/10-D12 Models
Output Overvoltage Protection
UNR 12-33W Series DC/DC converters do not incorporate output overvolt-
age protection. In the extremely rare situation in which the device’s feedback
loop is broken, the output voltage may run to excessively high levels. If it is
absolutely imperative that you protect your load against any and all possible
overvoltage situations, voltage limiting circuitry must be provided external to
the power converter.
7 Amps
Input Overvoltage and Reverse-Polarity Protection
UNR 12-33W Series DC/DC converters do not incorporate either input over-
voltage or input reverse-polarity protection. Input voltages in excess of the
listed absolute maximum ratings and input polarity reversals of longer than
"instantaneous" duration can cause permanent damage to these devices.
Output Overcurrent Detection
Overloading the output of a power converter for an extended period of
time will invariably cause internal component temperatures to exceed their
maximum ratings and eventually lead to component failure. High-current-
carrying components such as transformers, FET's and diodes are at the
highest risk. UNR 12-33W Series DC/DC converters incorporate an output
overcurrent detection and shutdown function that serves to protect both the
power converter and its load.
On/Off Control
The On/Off Control pin may be used for remote on/off operation. UNR
12-33W Series DC/DC converters are designed so that they are enabled
when the control pin is pulled high or left open (normal mode) and disabled
when the control pin is pulled low (to less than +0.8V relative to Logic
Ground). As shown in Figure 2, D5 models have internal 4.99kΩ pull-up
resistors to VIN (+Input), while D12 models have 12.4kΩ.
4
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5 & 1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Models
When the output current of a thermally stabilized converter exceeds the
maximum rating by 40ꢀ (typical) to 80ꢀ (maximum), the internal overcurrent
detection circuit shuts down the converter by discharging the soft-start circuit
of the pulse width modulator (PWM). In this off state, which is similar to that
achieved by pulling the On/Off Control low, the output voltage quickly drops
as the output capacitors discharge into the load. Since there is no longer any
output current, the overcurrent detection circuit is released, allowing the soft-
start circuit to recharge and the converter to turn on again. If the faulty load
condition persists, the overcurrent detection circuit will again discharge the
soft-start circuit and shut down the converter. This continuous on/off cycling
of the converter is referred to as “hiccup mode.” Once the overload condition
is removed, the converter remains on, and the output voltage is quickly
restored to its regulated value.
+OUTPUT
TRIM
Trim
Down
+INPUT
LOAD
INPUT
RETURN
Trim Up
OUTPUT
RETURN
Note: Install either a fixed trim-up resistor or a fixed trim-down resistor
depending upon desired output voltage.
Figure 4.Trim Connections Using Fixed Resistors
The components used to sense the output current have large temperature
coefficients. Consequently, in a "cold-start" situation, the Overcurrent Detec-
tion Point may temporarily move to 80ꢀ to 120ꢀ above the rated current
specification. The device quickly heats up, particularly if an overload situation
exists, and restores the normal (40ꢀ) Overcurrent Detection Point. The
device will not be damaged by starting up into an output-short-circuit condition.
2.49(VO – 1.26)
–1.74
RTDOWN (kΩ) =
1.8 – VO
UNR-1.8/10-D5T
UNR-1.8/10-D5SM
3.14
–1.74
RTUP (kΩ) =
VO – 1.8
The overcurrent detection circuitry helps keep internal current levels and
operating temperatures within safe operating limits. Nevertheless, sustained
operation at current levels above the rated output current but below the Over-
current Detection Point may result in permanent damage to the converter.
7.5(VO – 1.26)
2.5 – VO
–1.74
RTDOWN (kΩ) =
RTUP (kΩ) =
UNR-2.5/10-D5T
UNR-2.5/10-D5SM
9.47
–1.74
VO – 2.5
Output Voltage Trimming
7.5(VO – 1.27)
3.3 – VO
UNR-3.3/8-D5T
–1.0
–1.0
RTDOWN (kΩ) =
RTUP (kΩ) =
RTDOWN (kΩ) =
RTUP (kΩ) =
UNR-3.3/8-D5SM
UNR-3.3/10-D5T
UNR-3.3/10-D5SM
UNR 12-33W devices can be trimmed to any voltage between 1.52V and
3.6V. Trimming is accomplished with either a trimpot or a single fixed resistor.
The trimpot should be connected between +Output and Output Return with
its wiper connected to the Trim pin as shown in Figure 3 below.
9.5
–1.0
VO – 3.3
7.5(VO – 1.26)
3.3 – VO
UNR-3.3/8-D12T
UNR-3.3/8-D12SM
UNR-3.3/10-D12T
UNR-3.3/10-D12SM
+OUTPUT
9.41
–1.0
+INPUT
VO – 3.3
20kΩ
5-10
Turns
TRIM
LOAD
INPUT
RETURN
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted output accuracy.
VO = desired output voltage.
OUTPUT
RETURN
Figure 3.Trim Connections Using a Trimpot
A trimpot can be used to determine the value of a single fixed resistor
which should be connected, as shown in Figure 4, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Output
Return to trim up the output voltage. Fixed resistors should be metal-film
types with absolute TCR’s less than 100ppm/°C to ensure stability.
The equations below can be used as starting points for selecting specific
trim-resistor values. Recall that untrimmed devices are guaranteed to be
between ±1ꢀ and 2ꢀ accurate, depending on model. See Performance
and Functional Specifications.
5
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5 & 1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Series
Recommended PC Board Layout
Solder Reflow
If necessary, a single pc board layout can accommodate both through-hole
and SMT models of the UNR 12-33W Series. Note that on page 2 of this
data sheet, the through-hole package is drawn with a bottom view of its pin
locations, and the surface-mount package is drawn with of top view of its
pin locations. As shown below, the through-hole pin locations, when viewed
from above, fall just inside (on 1.8 inch centers) the SMT pin locations (which
essentially begin on 2.1 inch centers). The table below shows how the pin
functions align.
For the surface-mount models ("SM" suffix) of the UNR 12-33W Series, the
packages' gull-wing leads are made of tin-plated (150 microinches) copper.
The gull-wing configuration, as opposed to "J" leads, was selected
to keep the solder joints out from under the package to minimize both heat
conduction away from the leads (into the encapsulated package) and IR
shadowing effects. Through a series of experiments, using 8mil-thick, 63/37/2
(lead/tin/silver) solder paste and single-layer test boards, we have determined
an optimal solder-reflow temperature profile as shown in Figure 6. Optimal
profile will be a function of many factors including paste thickness, board
thickness, number of conductive layers, copper weight, the density of sur-
rounding components, etc.
1.800
0.10
(45.72)
(2.54)
7
The profile in Figure 6 should be used as a starting point for your own experi-
ments. If you'd like, DATEL can provide you with coml"dummy"
units to be used in such tests. Under no circuould the peak
temperature exceed +235°C for an exteed of time.
6
5
4
3
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
1.00
(25.40)
Case C16A2
2
1
0.300
(7.62)
TOP VIEW
As shown in Figure 7, our eshavtermined the optmg-pad size
to be 160 mils by 130
0.10
(2.54)
PINS 1-2, 4: 0.040 0.002 (1.016 0.051)
PINS 3, 5-7: 0.062 0.002 (1.575 0.051)
260
0
220
200
+INPUT
POWER
GROUND
ON/OFF CONTROL
TRIM
180
+OUTPUT
SOLDER
REFLOW
PEAK
160
TEMP.
235°C
140
120
100
80
0.100
(2.54)
0.110
(2.79)
4
9
60
8
7
6
5
0.800
(20.32)
4 EQ. SP. @
0.200 (5.08)
3
2
1.00
(25.40)
40
Case C18
0.500
(12.70)
20
0.300
(7.62)
PRE-HEAT AND TEMPERATURE SOAK
0
1
0
30
60
90
120
150
180
210
240
270
300
TOP VIEW
Time (Seconds)
0.10
(2.54)
Figure 6. Optimal Solder Reflow Profile
SMT
Pin Number
Through-Hole
Pin Number
Pin Function
N.C.
4
3
2
1
9
8
7
6
5
No Pin
No Pin
N.C.
2
1
7
6
5
4
3
On/Off Control
Logic Ground
+Input
Input Return
Output Return
Trim
0.015
(0.38)
+Output
Figure 5. Recommended Board Layout
0.110**
(2.79)
0.100**
(2.54)
0.130*
(3.30)
0.160*
(4.06)
* PAD DIMENSION
** LEAD DIMENSION
Figure 7. PC Board Land Pattern
6
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5 & 1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Models
T Y P I C A L P E R F O R M A N C E C U R V E S
VIN to VOUT Start-Up Time
D5 Models, Start-up from VIN
(Full load, using specified output capacitor.)
D12 Models, Start-up from VIN
(Full load, using specified output capacitor.)
VIN
VIN
2V/div
5V/div
VOUT
VOUT
1V/div
1V/div
10msec/div
10msec/div
On/Off Control to VOUT Start-Up Time
D5 Models, Start-up from Enable
(Full load, using specified output capacitor.)
D12 Models, Start-up from Enable
(Full load, using specified output capacitor.)
ENABLE
2V/div
ENABLE
5V/div
VOUT
VOUT
1V/div
1V/div
10msec/div
10msec/div
7
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5 & 1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Series
T E M P E R A T U R E D E R A T I N G
UNR-1.8/10-D5T/D5SM Output Power vs. Ambient Temperature
UNR-3.3/8-D12T/D12SM Output Power vs. Ambient Temperature, No Air Flow
20
18
16
14
12
10
8
30
25
20
15
10
5
6
4
2
0
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Ambient Temperature ( C)
Ambient Temperature ( C)
˚
˚
UNR-3.3/10-D5T/D5SM Output Power vs. Ambient Temperature, No Air Flow
UNR-2.5/10-D5T/D5SM Output Power vs. Ambient Temperature, No Air Flow
35
30
25
20
15
10
5
27.5
25
22.5
20
17.5
15
12.5
10
7.5
5
2.5
0
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Ambient Temperature ( C)
Ambient Temperature ( C)
˚
˚
UNR-3.3/10-D12T/D12SM Output Power vs. Ambient Temperature, No Air Flow
UNR-3.3/8-D5T/D5SM Output Power vs. Ambient Temperature, No Air Flow
35
30
25
20
15
10
5
30
27.5
25
22.5
20
17.5
15
12.5
10
7.5
5
2.5
0
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Ambient Temperature ( C)
Ambient Temperature ( C)
˚
˚
8
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5 & 1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Models
E F F I C I E N C Y V S . L I N E / L O A D
UNR-1.8/10-D5T/D5SM Efficiency vs. Line/Load
UNR-3.3/8-D5T/D5SM Efficiency vs. Line/Load
94
90
86
82
78
74
70
66
62
94
92
90
88
86
84
82
80
78
VIN = 4.75V
VIN = 5.5V
VIN = 5V
V
V
V
IN = 4.75V
IN = 5V
IN = 5.5V
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
Load Current (Amps)
Load Current (Amps)
UNR-2.5/10-D5T/D5SM Efficiency vs. Line/Load
UNR-3.3/8-D12T/D12SM Efficiency vs. Line/Load
94
90
86
82
78
74
70
66
62
94
92
90
88
86
84
82
80
78
V
V
V
IN = 4.75V
V
V
V
IN = 10.4V
IN = 5V
IN = 12V
IN = 5.5V
IN = 13.6V
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
Load Current (Amps)
Load Current (Amps)
UNR-3.3/10-D5T/D5SM Efficiency vs. Line/Load
94
92
90
88
86
84
82
80
78
V
V
V
IN = 4.75V
IN = 5V
IN = 5.5V
1
2
3
4
5
6
7
8
9
10
Load Current (Amps)
9
N O N - I S O L A T E D , 1 2 - 3 3 W ,
5
&
1 2 V - I N P U T D C / D C C O N V E R T E R S
UNR Series
®
®
INNOVATION and EXCELLENCE
ISO 9001 REGISTERED
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DS-0504
9/01
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
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: 6-6354-2025
Internet: www.datel.com
Email: sales@datel.com
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.
8
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