UNR Open-Frame Series
www.murata-ps.com
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
Features
■
Output: Non-isolated
1.5V or 1.8V @ 20 Amps
2.5V or 3.3V @ 15 or 20 Amps
■
Input Voltage: 4.75-5.5V (5V nominal)
■
Package: 2" x 2" x 0.49" open-frame with
attached heat sink
■
Full synchronous-rectifier topology
■
Efficiencies as high as 91%
■
Noise as low as 75mVp-p
■
Stable no-load operation
■
Excellent thermal derating
■
Output short-circuit protection
■
On/off control, trim and sense functions
■
UL60950/EN60950 certified
■
Qual tested, HALT tested, EMI tested
DATEL’s 30-66W UNR Series deliver an excellent solution to situations in which
users of modern DSP’s and CPLD’s requiring up to 20 Amps of "low-voltage"
(1.5-3.3V) current are constrained to drawing that power from a legacy 5V bus.
These are non-isolated DC/DC converters that deliver up to 20 Amps of 1.5-3.3V
current from a 5V input. Combining a modern, fully synchronous buck topology with
a unique, integrated-metal-technology (IMT) package, the automatically assembled
30-66W UNR’s deliver high efficiency (to 91%), excellent thermal performance (to
+70°C with 100lfm air flow), and low cost.
These converters require no compromises. They are fully line (±0.1%) and
load (±0.5%) regulated and feature low noise (typically 75mVp-p) and quick step
response (50msec). Their feature set includes VOUT trim capability, an on/off control
function, output remote-sense pins, and output overcurrent detection and shortcircuit protection ("hiccup" technique with auto-recovery). Their unique package
integrates an anodized aluminum heat sink with the circuit’s thermal-clad aluminum
baseplate. With minimal air flow (100lfm), all models deliver full output power/current up to +65°C.
All UNR 30-66W Open-Frame DC/DC Converters are UL1950/EN60950 certified. Safety certifications, EMC compliance test reports, and qualification (including
HALT) test reports are available upon request.
OBSOLETE PRODUCT
Last time buy: 3 March 2014
Click here for more information.
+INPUT
(7)
+OUTPUT
(4)
10.5Ω
+SENSE
(3)
INPUT
RETURN
(8)
10.5Ω
VOLTAGE
BOOST
OVERCURRENT
DETECTION
+VCC
ON/OFF
CONTROL
(6)
PWM
CONTROLLER
REFERENCE &
ERROR AMP
OUTPUT
RETURN
(5)
–SENSE
(2)
VOUT
TRIM
(1)
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
Typical topology is shown.
www.murata-ps.com/support
UNR30-66W.C01 Page 1 of 8
UNR Open-Frame Series
Performance Specifications and Ordering Guide
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
➀
Output
Input
R/N (mVp-p) ➁
Regulation (Max.)
Load ➂
Range
(Volts)
IIN ➃
(mA/A)
Min.
Typ.
±0.5%
5
4.75-5.5
150/7080
82.5%
84%
±0.1%
±0.5%
5
4.75-5.5
150/8500
83.5%
85%
C21, P26
120
±0.1%
±0.5%
5
4.75-5.5
150/8430
86%
89%
C21, P26
75
120
±0.1%
±0.5%
5
4.75-5.5
150/11360
83%
86%
C21, P26
75
120
±0.1%
±0.5%
5
4.75-5.5
150/10880
87%
91%
C21, P26
75
120
±0.1%
±0.5%
5
4.75-5.5
150/14830
86%
89%
C21, P26
Root Model ➄
IOUT
(Amps)
Typ.
Max.
Line
UNR-1.5/20-D5
1.5
20
80
100
±0.1%
UNR-1.8/20-D5
1.8
20
80
100
UNR-2.5/15-D5
2.5
15
75
UNR-2.5/20-D5
2.5
20
UNR-3.3/15-D5
3.3
15
UNR-3.3/20-D5
3.3
20
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless
otherwise noted. All models are tested and specified with a 22µF output capacitor with a
200mΩ ESR and a 4000µF input capacitor with 9.75Arms ripple-current rating and 20mΩ ESR.
See I/O Filtering and Noise Reduction for more details.
➁ 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.
➂ These devices have no minimum-load requirements and will regulate under no-load conditions.
➃ Nominal line voltage, no-load/full-load conditions.
➄ These are only partial part numbers. Refer to the part number structure when ordering.
Case C21
U NR - 3.3 / 20 - D5 - C
2.00
(50.80)
RoHS-6 compliant*
Output Configuration:
U = Unipolar
Nominal Output Voltage:
1.2, 1.5, 1.8, 2.5 or 3.3 Volts
C21, P26
MECHANICAL SPECIFICATIONS
PART NUMBER STRUCTURE
Non-Isolated
Package
(Case,
Pinout)
Efficiency
VIN Nom.
(Volts)
VOUT
(Volts)
Input Voltage Range:
D5 = 4.75 to 5.5 Volts (5V nominal)
0.49
(12.45)
0.25
(6.35)
Maximum Rated Output
Current in Amps
* Contact Murata Power Solution Technologies (DATEL) for availability.
0.040 ±0.002 DIA.
(1.016 ±0.051)
4 PLACES
0.080 ±0.002 DIA.
(2.032 ±0.051)
4 PLACES
1.600
(40.64)
6
1
0.600
(15.24)
3 EQ. SP. @
0.200 (5.08)
2
0.500
(12.70)
3
7
4
0.400
(10.16)
2.00
1.640
(41.66) (50.80)
0.320
(8.13)
5
8
BOTTOM VIEW
#4-40 THD THRU
4 PLACES
0.180
(4.57)
0.180
(4.57)
1.640
(41.66)
DIMENSIONS ARE IN INCHES (MM)
I/O Connections
Pin
1
2
3
4
5
6
7
8
Function P26
Trim
–Sense
+Sense
+Output
Output Return
On/Off Control
+Input
Input Return
www.murata-ps.com/support
UNR30-66W.C01 Page 2 of 8
UNR Open-Frame Series
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
Input
Input Voltage Range
4.75 to 5.5 Volts (5V nominal)
Input Current:
Normal Operating Conditions
Standby/Off Mode
See Ordering Guide
TBD
Input Ripple Current:
UNR-1.5/20-D5, UNR-1.8/20-D5
UNR-2.5/15-D5
UNR-2.5/20-D5
UNR-3.3/15-D5
UNR-3.3/20-D5
260mAp-p
150mAp-p
140mAp-p
100mAp-p
150mAp-p
Input Filter Type
Capacitive (74µF)
Overvoltage Protection
None
Reverse-Polarity Protection
None
On/Off Control (Pin 6) ➂
On = open or +4V to +VIN; IIN = TBD
Off = +0.4V to 1V; IIN = TBD
➀ All models are tested and specified with a 22µF output capacitor with a 200mΩ ESR and a
4000µF input capacitor with 9.75Arms ripple-current rating and 20mΩ 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.
➁ See Output Overcurrent Detection for details.
➂ See On/Off Control for details.
➃ See Output Voltage Trimming for details.
➄ See Start-Up Time for details.
➅ See Temperature Derating for details.
Absolute Maximum Ratings
Input Voltage:
Continuous
Transient (100msec)
5 Volts
7 Volts
Input Reverse-Polarity Protection
None
Input/Output Overvoltage Protection
None
Output Current
Current limited. Devices can
withstand a sustained output
short circuit without damage.
Storage Temperature
–40 to +105°C
Lead Temperature (Soldering, 10 sec.)
+300°C
Output
VOUT Accuracy (50% load)
±1% maximum
VOUT Trim Range (3.3VOUT models): ➃
Trim pin tied to +Output
Trim pin tied to Output Return
VOUT = <1.53 Volts
VOUT = >3.6 Volts
Minimum Loading
No load
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Overcurrent Protection: ➁
Technique
15 Amp Models
20 Amp Models
Average Output Current
"Hiccup" with auto-recovery
146 to 173% (160% typical)
115 to 130% (120% typical)
1 Amp typical, 3 Amps maximum
Dynamic Characteristics
Transient Response (50 to 75% step)
50µsec to ±2% of final value
Start-Up Time: ➄
VIN to VOUT
On/Off to VOUT
30msec
30msec
Switching Frequency
200kHz (±20kHz)
Environmental
Operating Temperature (Ambient): ➅
Without Derating
With Derating
Storage Temperature
–40 to +35-65°C
to +100°C (See Derating Curves)
–40 to +105°C
Physical
Dimensions
2" x 2" x 0.49" (51 x 51 x 12.45mm)
Shielding
Open-frame
Attached Heatsink
Black anodized aluminum
Circuit Board
Single-layer conductors on aluminum base
Pin Material
RoHS: Gold plate over copper alloy
Non-RoHS: Tin over copper alloy
Weight
1.7 ounces (48.2 grams)
Flammability
UL 94V-0
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.
TECHNICAL NOTES
Return Current Paths
These are non-isolated DC/DC converters. The Input Return and Output
Return pins are connected to each other 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 control signals
applied to the On/Off Control pin should be referenced to Input/Output
Return.
I/O Filtering and Noise Reduction
All models in the UNR 30-66W Series are tested and specified with an
external 22µF output capacitor (200mΩ ESR) and a 4000µF input capacitor
with a 9.75Arms ripple-current rating. External input capacitance is required
and must be rated to handle the input ripple current as follows:
IRMS = IOUT
√
VOUT
VIN
(1 – VOUT )
VIN
(The large value of the input capacitor is due mainly to output characteristics
of DATEL's outgoing ATE test system. Ripple current rating is an important
consideration for the end user.) In critical applications, input/output ripple/
noise may be further reduced by installing additional I/O caps.
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. The switching nature of modern
DC/DC converters requires that dc input voltage sources have low ac
impedance, and highly inductive source impedances can affect system
stability. Your specific system configuration may necessitate additional
considerations.
Output ripple/noise (also referred to as periodic and random deviations or
PARD) can be reduced below specified limits 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.
www.murata-ps.com/support
UNR30-66W.C01 Page 3 of 8
UNR Open-Frame Series
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
Output ripple/noise (also referred to as periodic and random deviations or
PARD) can be reduced below specified limits 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.
7
5kΩ
6
ON/OFF
CONTROL
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.
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 Engineering Group for additional details.
Input Fusing
UNR 30-66W Series DC/DC 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
exist. To allow for inrush transients, fuses should rated for approximately 2
times the maximum input rms current.
Input Overvoltage and Reverse-Polarity Protection
UNR 30-66W Series DC/DC converters do not incorporate either input overvoltage 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.
On/Off Control
The On/Off Control pin may be used for remote on/off operation. UNR 3066W Series DC/DC converters are designed so that they are enabled when
the control pin is pulled high or left open, and disabled when the control pin
is pulled low (see Performance Specifications for limits). As shown in Figure
2, all models have internal 5kΩ pull-up resistors to +Input.
+INPUT
8
INPUT
RETURN
Figure 2. Driving the On/Off Control Pin
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 power (system 5V
power) 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.
Start-Up Time
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 (4.75 Volts) and the fully loaded output voltage enters and remains
within it 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 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 Overvoltage Protection
Dynamic control of the on/off function is best accomplished with a mechanical relay or open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current when
activated and withstand appropriate voltage when deactivated.
UNR 30-66W Series DC/DC converters do not incorporate output overvoltage protection. In the extremely rare situation in which the device’s feedback
loop is broken, the output voltage may run to excessively high levels (VOUT =
VIN). 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.
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-currentcarrying components such as inductors, FET's and diodes are at the highest
risk. UNR 30-66W Series DC/DC converters incorporate an output overcurrent detection and shutdown function that serves to protect both the power
converter and its load.
www.murata-ps.com/support
UNR30-66W.C01 Page 4 of 8
UNR Open-Frame Series
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
When the output current of a thermally stabilized converter exceeds the
maximum rating (15A models by 20% typ., 30% max.; 20A models by 60%
typ., 73% max.), the internal overcurrent detection circuit automatically 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.
The components used to sense the output current have large temperature
coefficients. Consequently, in a “cold-start” situation, the Overcurrent Detection Point may temporarily move to 160% to 195% for 15A models and 120%
to 145% for 20A models above the rated current specification. The device
quickly heats up, particularly if an overload situation exists, and restores the
normal Overcurrent Detection Point.
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 Overcurrent Detection Point may result in permanent damage to the converter
(unless active cooling keeps internal temperatures below safe limits).
Output Voltage Trimming
+OUTPUT
Trim
Down
+INPUT
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
UNR-1.5/20-D5 Trim Equations
24
$/7. K7
6/n
n6/
24
50 K7
6/n
n
n
UNR-1.8/20-D5 Trim Equations
24
$/7. K7
6/n
n6/
24
50 K7
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.
LOAD
TRIM
6/n
n
n
UNR-2.5/15-D5 & UNR-2.5/20-D5 Trim Equations
24
$/7. K7
6/n
n6/
n
+OUTPUT
24
50 K7
+INPUT
TRIM
INPUT
RETURN
20kΩ
5-10
Turns
6/n
n
LOAD
OUTPUT
RETURN
UNR-3.3/15-D5 & UNR-3.3/20-D5 Trim Equations
24
$/7. K7
6/n
Figure 3. Trim Connections Using a Trimpot
24
50 K7
A trimpot can be used to determine the value of a single fixed resistor
which should be connected, as shown in Figure 4, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Output
Return to trim up the output voltage. Fixed resistors should be metal-film
types with absolute TCR’s less than 100ppm/°C to ensure stability.
The equations and look-up table below can be used as starting points for
selecting specific trim-resistor values. Recall that untrimmed devices are
guaranteed to be ±1% accurate.
n6/
6/n
n
n
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage.
Temperature Derating
The outstanding electrical efficiency of the UNR 30-66W Series' synchronous-rectifier design and the excellent thermal conductivity of its aluminum
base PCB/Heatsink construction combine to eliminate the need for supplemental forced-air cooling in the majority of routine applications. See Derating Curves.
www.murata-ps.com/support
UNR30-66W.C01 Page 5 of 8
UNR Open-Frame Series
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
Typical Performance Curves
5.2$%FFICIENCYVS,OAD #!MBIENT
5.2$%FFICIENCYVS,OAD #!MBIENT
6).6
%FFICIENCY
%FFICIENCY
6).6
6).6
6).6
6).6
6).6
/UTPUT#URRENT!MPS
5.2$%FFICIENCYVS,OAD #!MBIENT
5.2$%FFICIENCYVS,OAD #!MBIENT
%FFICIENCY
%FFICIENCY
/UTPUT#URRENT!MPS
6).6
6).6
6).6
6).6
6).6
6).6
/UTPUT#URRENT!MPS
/UTPUT#URRENT!MPS
5.2$%FFICIENCYVS,OAD #!MBIENT
5.2$%FFICIENCYVS,OAD #!MBIENT
%FFICIENCY
%FFICIENCY
6).6
6).6
6).6
6).6
6).6
6).6
/UTPUT#URRENT!MPS
/UTPUT#URRENT!MPS
www.murata-ps.com/support
UNR30-66W.C01 Page 6 of 8
UNR Open-Frame Series
Typical Performance Curves
5.2$-AXIMUM4EMPERATURE$ERATING6).6
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
5.2$-AXIMUM4EMPERATURE$ERATING6).6
/UTPUT#URRENT!MPS
/UTPUT#URRENT!MPS
.!452!,#/.6%#4)/.
.!452!,#/.6%#4)/.
,&,&
,&-
n
,&-
,&,&
n
!MBIENT4EMPERATURE#
!MBIENT4EMPERATURE#
5.2$/UTPUT0OWER$ERATINGVS!MBIENT4EMPERATURE
5.2$/UTPUT0OWER$ERATINGVS!MBIENT4EMPERATURE
.!452!,#/.6%#4)/.
.!452!,#/.6%#4)/.
/UTPUT0OWER7ATTS
/UTPUT0OWER7ATTS
,&,&-
,&,&-
,&-
,&-
,&,&-
n
n
!MBIENT4EMPERATURE#
!MBIENT4EMPERATURE#
5.2$/UTPUT0OWER$ERATINGVS!MBIENT4EMPERATURE
5.2$/UTPUT0OWER$ERATINGVS!MBIENT4EMPERATURE
.!452!,#/.6%#4)/.
,&
/UTPUT0OWER7ATTS
/UTPUT0OWER7ATTS
,&-
,&-
,&-
.!452!,#/.6%#4)/.
,&-
,&
,&
,&
n
!MBIENT4EMPERATURE#
n
!MBIENT4EMPERATURE#
www.murata-ps.com/support
UNR30-66W.C01 Page 7 of 8
UNR Open-Frame Series
Single Output, Non-Isolated, 15-20 Amp
5VIN, 1.5-3.3VOUT DC/DC Converters
Typical Performance Curves
Start-up from VIN
Start-up from Enable
(VIN = nominal, full load, external 22µF output capacitor.)
(VIN = nominal, full load, external 22µF output capacitor.)
VIN
2V/div
Enable
2V/div
VOUT
2V/div
VOUT
2V/div
10ms/div
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
10ms/div
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. 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.
© 2013 Murata Power Solutions, Inc.
www.murata-ps.com/support
UNR30-66W.C01 Page 8 of 8