OBSOLETE PRODUCT

UNS Series
Non-Isolated, 3.3V & 5V, 3A DC/DC Converters
OBSOLETE PRODUCT
Low cost, high efficiency, wide input voltage range and low output
noise define DATEL’s new UNS Series of non-isolated, step-down,
switching DC/DC converters.
FEATURES
PRODUCT OVERVIEW
Low cost
The 3.3V- and 5V-output devices are, respectively,
90% and 92% efficient. All models are fully line
and load regulated and maintain specified accuracy
over the impressively wide input voltage ranges of
4.75 to 13.6 Volts for 3.3V outputs and 6 to 16.5
Volts for 5V outputs. Output ripple and noise are
typically 50mVp-p.
SIP or DIP packaging
3.3V (10W) or 5V (15W) outputs
Wide range inputs:
4.75-13.6V for 3.3V models
6-16.5V for 5V models
High efficiencies, typically 90-92%
Low output noise, 50mVp-p
Remote on/off control
100μA "standby" input current
Output current limiting
EMC compliant
Highly reliable, 100% SMT construction
Conformally coated for harsh environments
UNS devices are fabricated using proven SMTon-pcb construction techniques. The 3.3V and 5V
devices are both available in either lightweight SIP
(2" x 0.4" x 0.8") or DIP (2" x 0.8" x 0.4", 600 mil
spacing between rows) package configurations.
The DIP option is designated by a "D" suffix added
to the part number. All models are conformally
coated for protection against moisture and dust.
The high efficiency of the UNS Series’ fixed-frequency (190kHz) switching design eliminates the
need for thermally conductive potting compound.
Devices are specified for full-power operation up
to ambient temperatures of +50°C. With derating,
they operate up to +70°C. Calculated MTBF (MILHDBK-217F) is more than 1.6 million hours.
These simple-to-use power converters have no
minimum load requirements. They draw 1mA when
unloaded and a mere 100μA in the standby mode
(On/Off Control turned off). 3.3V models have an
output voltage adjustment range of 2.7 to 3.3 Volts.
5V models are adjustable down to 3.0V.
SIMPLIFIED SCHEMATIC
+VIN
+VOUT
+VIN
+VOUT
–VIN
TRIM
–VIN
OUTPUT
RETURN
OUTPUT
RETURN
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UNS10-15W.B01 Page 1 of 5
UNS Series
Non-Isolated, 3.3V & 5V, 3A DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE 1
Output
VOUT
(V)
IOUT
(A)
UNS-3.3/3-D5
3.3
3
UNS-3.3/3-D5D
Model Family 2
Input
Typ.
Max.
Line
Load
VIN Nom.
(V)
Min.
Typ.
Package
(Case/
Pinout)
50
100
±1.0
±3.0
7.5
4.75-13.6
1/1400
--
90%
B1, P18
R/N (mVp-p)3
Regulation (Max.)4
Range
(V)
Efficiency
IIN 5
(mA)
3.3
3
50
100
±1.0
±3.0
7.5
4.75-13.6
1/1400
--
90%
B2, P18
UNS-5/3-D12
5
3
50
100
±1.0
±3.0
12
6-16.5
1/1330
--
92%
B1, P18
UNS-5/3-D12D
5
3
50
100
±1.0
±3.0
12
6-16.5
1/1330
--
92%
B2, P18
1 Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise noted.
2 "D" suffix indicates DIP package.
3 Ripple/Noise (R/N) measured over a 20MHz bandwidth with a 100μF external input capacitor and
a 220μF external output capacitor. Additional ouput capacitors will lower R/N. See Technical Notes.
PART NUMBER STRUCTURE
4 Listed output regulation specifications describe the total change in output voltage as the input (line)
voltage or output (load) current is varied over its full specified range. Typically, line regulation is
better than ±0.5% and load regulation is better than ±1.0%. Load regulation applies for 0 to 100%
load conditions.
5 Nominal line voltage, no-load/full-load conditions.
MECHANICAL SPECIFICATIONS
Case B1 (SIP)
U NS - 3.3 / 3 - D5 D
Output Configuration:
U = Unipolar
Add "D" suffix for optional
DIP package configuration
Input Voltage Range:
D5 = 4.75-13.6 Volts (7.5V nominal)
D12 = 6-16.5 Volts (12V nominal)
Non-Isolated
SIP packaging
Nominal Output Voltage:
3.3 or 5 Volts
Maximum Output Current
in Amps
%130
Important: Do not include the "A" suffix when ordering.
%130
TEMPERATURE DERATING
Case B2 (DIP)
20
18
16
UNS-5/3-D12
Output Power (Watts)
14
12
UNS-3.3/3-D5
10
8
%130
6
4
%130
34!.$/&&
./#/..%#4)/.&/2-%#(!.)#!,34!"),)49/.,9
2
$)-%.3)/.3!2%).).#(%3--
0
–10
0
10
20
30
40
50
60
70
80
90
100
Ambient Temperature (°C)
Note: Derating curves apply to both SIP and DIP package configurations
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Pin
INPUT/OUTPUT CONNECTIONS
Function P18
Pin
Function P18
1
+Input
6
Trim
2
+Input
7
Output Rtn.
3
-Input
8
Output Rtn.
4
-Input
9
+Output
5
On/Off Control
10
+Output
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UNS10-15W.B01 Page 2 of 5
UNS Series
Non-Isolated, 3.3V & 5V, 3A DC/DC Converters
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. Input
TECHNICAL NOTES
Input and Output Capacitors
Input Voltage Range:
"D5" and "D5D" Models
"D12" and "D12D" Models
4.75-13.6 Volts (7.5V nominal)
6-16.5 Volts (12V nominal)
Input Current
See Ordering Guide
Input Filter Type
Capacitive
Overvoltage Protection
None
Reverse-Polarity Protection
None
On/Off Control (Pin 5) TTL high (or open) = on, low = off
Output
VOUT Accuracy
±5%, maximum
Temperature Coefficient
±0.01% per °C
Ripple/Noise (20MHz bandwidth) See Ordering Guide
Line/Load Regulation See Ordering Guide
Efficiency
See Ordering Guide
Current Limiting Auto-recovery
Transient Response (50% load step)
200μsec max. to ±2% of final value
Switching Frequency
190kHz
Environmental
Operating Temperature:
Without Derating
With Derating
–10 to +50°C
to +70°C (See Derating Curve)
Storage Temperature
–25 to +85°C
Physical
2 x 0.41 x 0.8" (50 x 10.3 x 21mm)
2 x 0.8 x 0.44" (50 x 21 x 11.3mm)
Shielding
None
Case Connection
None
Pin Material
Gold-plated phosphor bronze
Weight
0.35 ounces (10 grams)
Rather than install a large, expensive, on-board capacitor that addresses
all possible input-voltage and output-load conditions, DATEL has chosen to
leave out the bulk of the input capacitance so that users may select a costeffective component appropriate to their own application. We use a low-ESR
100μF external input capacitor during production testing.
For “A” suffix models only, as output current exceeds the rated limit, current will be sharply reduced using the foldback current limit technique. As
current is further reduced to a low value, the converter will automatically
recover normal operation and rated output voltage.
The exact current where autorecovery occurs is dependent on the reactance of the output load and whether the output load has any “constant
current” characteristics at start up. On “A” suffix models, some types of
heavy “constant current” loads may fail to start up properly. This can be
offset by adding required external capacitance (see below). Normal resistive
loads will autorecover near the rated full current limit.
100
Absolute Maximum Ratings
80
Output Voltage (%)
UNS Series devices require external input/output capacitors to achieve rated perfor
mance. Listed specifications assume CIN = 100μF and COUT = 220μF.
See Technical Notes.
Output Ripple/Noise can be reduced with external capacitors. See Technical Notes.
UNS Series converters have no minimum-load requirements.
Current limiting initiates at approximately 5% above rated load.
DIP models have a standoff which makes their total above-board height 0.44 inches.
Input Voltage:
"D5" Models
"D12" Models
The total input capacitance functions as a true energy-storage element, and
its optimal value will vary as a function of line voltage. The selected external
input capacitor should have both low ESR and low ESL because, as the
power converter’s input FET switch cycles on and off, the input capacitance
must have the ability to instantaneously supply pulses of relatively high current.
Foldback Autorecovery – models with the “A” suffix only
Dynamic Characteristics
Dimensions: SIP Models
DIP Models Though UNS Series, non-isolated, DC/DC converters have on-board input
and output capacitors (CIN = 6.8μF, COUT = 6.8μF), the majority of applications will require the installation of additional external I/O capacitance.
60
40
20
0
0
50
100
150
Output Current (%)
Fig. 1 – Current foldback in “A” suffix units
15 Volts
18 Volts
Output Capacitance is Required
Input Reverse-Polarity Protection
None. See Technical Notes.
Output Overvoltage Protection
None
Output Current
Current limited. Devices can
withstand an output short circuit
for brief durations only.
Storage Temperature
–25 to +85°C
Lead Temperature (soldering, 10 sec.)
+300°C
Almost all applications must add external output capacitance to improve
stability, start-up characteristics and to reduce noise. DATEL recommends
approximately 330μF as a starting point using low-ESR capacitors such as
the Sanyo OSCON or Poscap series. Use a capacitor voltage rating twice
the expected output voltage. Lower capacitance and/or higher ESR can
cause instability with inductive loads. Higher capacitance can lead to poor
transient response and sluggish regulation. Mount the capacitor close to
the converter and keep leads short. You may need to experiment.
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.
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UNS10-15W.B01 Page 3 of 5
UNS Series
Non-Isolated, 3.3V & 5V, 3A DC/DC Converters
UNS 5 and 3.3 Volt Series Specification Revision Notice
Notice: As of January 2006, all models now inlude an “A” suffix
marked on the unit to indicate a mandatory change in the PWM. Older
models without the “A” suffix are now obsolete.
+OUTPUT
9, 10
R1
In late 2003, all UNS series 5 Volt output DC/DC converters improved some
specifications and changed the trim values. These same changes were
applied to 3.3 Volt output converters in January 2006. The new converters
are designated with a trailing letter “A” in the model number (Example:
UNS-5/3-D12DA) marked on the unit. This designation is not used in
the ordering model number – it only appears on the device itself. These
changes were unavoidable because of obsolescence of the PWM controller.
Older models without the “A” suffix are no longer available.
ERROR
AMP
R3
1.195V
"A" Suffix Models - revised specification
Line regulation
±0.2% typ., ±1.0% Max.
Load regulation
±0.2% typ., ±1.5% Max.
Input/output pins
0.64mm dia., Tin plated
Internal reference voltage, Vref
0.8 Volts
Overcurrent protection
Foldback current limiting
RLOAD
TRIM
R2
7, 8
OUTPUT
RETURN
All specifications are unchanged except the following:
Specification
RTRIM
6
Figure 2. Output Voltage Trimming
5V and 3V Model Trim Values
Note that if you have not installed trim resistors to existing circuits, there is
no change. Also, if you have installed a trim pot (instead of a fixed external
trim resistor), you may only need to recalibrate the trim pot. The trim pot
value normally does not need to change. If you do not install trim resistors,
leave Trim pin 6 unconnected (open).
On the trim circuit diagram, Figure 2, use the following revised table:
Output Trimming
5V devices can be trimmed down to 3.0V, and 3.3V devices can be trimmed
down to 2.7V using a single external trimpot or fixed resistor. The trimpot
should be connected between +VOUT (pins 9 and 10) and Trim (pin 6) as
shown in the figure below. The trimpot can be used to determine the value of
a single fixed resistor which can then be connected between pins 9 and 10
and 6. Fixed resistors should be metal-film types with relatively low absolute
TCR’s to ensure stability.
In order to maximize their efficiency, UNS devices employ high-value resistors in their voltage feedback loop. Consequently, the external trimpots must
also be high-resistance devices (1-2 megohms). If the trimpots are accidentally turned to their 0Ω stops, it will not damage the converters; however, the
output voltage will be pulled down to an unstable level. Use care not to trim
the output voltage below the levels indicated in the accompanying table.
UNS-3.3/3
"A" models
UNS-5/3
older models
UNS-5/3
"A" models
Output Voltage
2.7 to 3.3V
Adjustment Range
2.7 to 3.3V
3.0 to 5.0V
3.0 to 5.0V
R1 Value
68.68KΩ
62.51KΩ
124.7KΩ
106KΩ
R2 Value
39KΩ
20KΩ
39KΩ
20KΩ
R3 Value
10KΩ
0Ω (short)
10KΩ
0KΩ (short)
Voltage Reference, Vref
1.195V
0.8V
1.195V
0.8V
Model Number
UNS-3.3/3
older models
RoHS-Compliance
RoHS (Reduction of Hazardous Substances) compliance is indicated
solely by the manufacturing date code. All UNS-5V converters with date
code “WM” (December 2005) or later are RoHS-compliant. All UNS-3.3V
converters with date code “VF” (June 2006) or later are RoHS-compliant.
Non-RoHS converters are no longer available. All RoHS models also include
the “A” suffix changes.
Please note carefully that RoHS units do not include a “-C” suffix.
“A” Model Trim Equation
Rtrim = (R1 x R2 (Vout – Vref)) / (R1 x Vref – R2 (Vout – Vref)) – R3
(R3 = 0Ω for “A” models)
Finally, please note that the trailing “A” suffix in the model number is not
used for ordering these converters. Use the standard model numbers
without the “A” suffix.
Date Codes
The manufacturing date code is a 2-letter code as follows:
First letter (year):
Y:2003, X:2004, W:2005, V:2006, U:2007, T:2008, S:2009, R:2010, Q:2011,
P:2012, O:2013, N:2014, M:2015
Second letter (month):
A:January, B:February, C:March, D:April, E:May, F:June, G:July, H:August, I:
not used, J:September, K:October, L:November, M:December
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UNS10-15W.B01 Page 4 of 5
UNS Series
Non-Isolated, 3.3V & 5V, 3A DC/DC Converters
The On/Off Control Pin
For normal operation, pin 5 should be left open. This pin has an internal
250kΩ pull-up resistor to +5V (or to +VIN if +VIN < 5V). For dynamic control
of the converters’ on/off functionality, a TTL logic high (+2.4V minimum,
+5V maximum or +VIN maximum if +VIN < 5V, 100μA max.) applied to pin 5
enables the converter, and a quasi-TTL logic low (0 to +0.5V, 100μA max.)
disables the converter. Control voltages should be referenced to pins 3 and 4
(–Input). For best results, use a mechanical relay or open-collector logic.
When the converter is turned off, its input "standby" current will be approximately 100μA. Applying a voltage that is greater than VIN to the On/Off Control pin, or applying any voltage to this pin when no input power is applied to
the converter, may cause permanent damage to the converter.
100
100
98
98
96
96
Efficiency (%)
Efficiency (%)
TYPICAL PERFORMANCE CURVES
94
92
V IN = 6V
90
V IN = 12V
88
V IN = 4. 75V
94
92
90
V IN = 7. 5V
88
86
86
V IN = 16. 5V
84
0
0.5
1.0
1.5
2.0
2.5
V IN = 13. 6V
84
3.0
0
5V Output Current (Amps)
0.5
1.0
1.5
2.0
2.5
3.0
3.3V Output Current (Amps)
Efficiency vs. Output Current and Input Voltage (Model UNS-5/3)
Efficiency vs. Output Current and Input Voltage (Model UNS-3.3/3)
USA:
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada: Toronto, Tel: (866) 740-1232, email: [email protected]
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany: München, Tel: +49 (0)89-544334-0, email: [email protected]
www.murata-ps.com email: [email protected] ISO 9001 REGISTERED
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.
© 2008 Murata Power Solutions, Inc.
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
04/09/08
www.murata-ps.com
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDC_UNS10-15W.B01 Page 5 of 5