UNR-1.8-10-D5 Murata Manufacturing Co., Ltd, UNR-1.8-10-D5 Datasheet - Page 3

• Manufacturer Part Number: UNR-1.8-10-D5
• Description: Non-isolated, 1.8/2.5/3.3vout 8 And 10 Amp Dc/dc Converters
• Manufacturer: Murata Manufacturing Co., Ltd

N O N - I S O L A T E D , 1 8 - 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
Performance/Functional Specifi cations
Typical @ T
➀ All models are tested and specifi ed with an external 470μF input capacitor rated for 6Arms
➁ No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.
➂ Applying an external voltage to the On/Off Control pin when no input voltage is applied can
➃ See On/Off Control Functionality.
➄ Output noise may be further reduced with additional external capacitors across the output
➅ Current limiting initiates at approximately 30% above rated load. Under short-circuit conditions,
Input Voltage Range
Input Current ➁
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
On/Off Control: ➂ ➃
V
Ripple/Noise (20MHz BW) ➄
Line/Load Regulation
Effi ciency
Overcurrent Protection: ➁
Transient Response (50-100% load):
Switching Frequency
Operating Temperature (Ambient):
Storage Temperature
Dimensions:
Shielding
Case Connection
Case Material
Pin Material
Weight
ripple current and an external 22μF output capacitor with an ESR lower than 200mΩ.
These devices have no minimum-load requirements and will regulate under no-load conditions.
cause permanent damage to the converter.
terminals. Caps should have low ESR (typically 60mΩ) and be located as close to the unit
as possible.
output current folds back to approximately 1A and remains there until the short is removed.
OUT
D5 Models
D12 Models
1.8V
2.5/3.3V
1.8V
2.5-3.3V
2.5-3.3V
D5 Models
2.5V -D12 Models
3.3/8 -D12 Models
3.3/10 -D12 Models
C5A1, C5A2 Cases
C5C2 Case
Without Derating
With Derating
8 Amp -D5 Models
10 Amp -D5 Models
8 Amp -D12 Models
10 Amp -D12 Models
Accuracy (50% load):
OUT
OUT
A
= +25°C under nominal line voltage and full-load conditions unless noted.
-D5 Models
Models
OUT
OUT
OUT
Models
-D5 Models
-D12 Models
Dynamic Characteristics
Environmental
Physical
Input
Output
4.75-5.5 Volts (5V nominal)
10.8-13.6 Volts (12V nominal)
See Ordering Guide
Capacitive
None
None
±2% of V
±1% of V
See Ordering Guide
See Ordering Guide
See Ordering Guide
60μsec to 2.5% V
50μsec to 2.5% V
50μsec to 1% V
200kHz (±20kHz)
See Derating Curves
to +100°C (See Derating Curves)
2" x 1" x 0.39" (51 x 25 x 9.9mm)
2" x 1" x 0.48" (51 x 25 x 12.2mm)
2" x 1" x 0.39" (51 x 25 x 9.9mm)
2" x 1" x 0.48" (51 x 25 x 12.2mm)
5 sided
Pin 5 (Input Return)
Corrosion-resistant steel with
non-conductive, epoxy-based, black
enamel fi nish and plastic baseplate
Brass, solder coated
1.4 ounces (39.7 grams)
1.76 ounces (49.4 grams)
TTL high (or open) = on, low = off
9-15 Amps (12 Amps typical)
11-18 Amps (15 Amps typical)
9-15 Amps (12 Amps typical)
11-19 Amps (14 Amps typical)
–40 to +105°C
OUT
OUT
maximum
maximum
OUT
OUT
OUT
➀
3
Return Current Paths
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 fl ow through Logic Ground (i.e., the Input/Output
Return pins should never be left open or connected via high-impedance
paths).
I/O Filtering and Noise Reduction
All models in the UNR 18-33W Series converters are tested and specifi ed
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.
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
specifi c system confi guration may necessitate additional considerations.
Output ripple/noise (also referred to as periodic and random deviations or
PARD) can be reduced below published specifi cations by using fi ltering
techniques, the simplest of which is the installation of additional external
output capacitors. Output capacitors function as true fi lter 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.
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.
Input Voltage:
Input Reverse-Polarity Protection
Input/Output Overvoltage Protection
Output Current
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 Specifi cations Table is not implied.
T E C H N I C A L N O T E S
Continuous:
D5 Models
D12 Models
Absolute Maximum Ratings
7 Volts
15 Volts
None
None
Current limited. Devices can
withstand a sustained output
short circuit without damage.
–40 to +105°C
+300°C
UNR Models