TWR A-Series
12-15W, Triple Output DC-DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted.
Absolute Maximum Ratings
Input
Input Voltage Range
Input Current
18-72 Volts (48V nominal)
See Ordering Guide
Pi
Input Voltage:
80 Volts
Input Reverse-Polarity Protection
Current must be <6A. Brief
duration only. Fusing recommended.
Input Filter Type
Reverse-Polarity Protection
Output
Yes (Instantaneous, 6A maximum)
Output Overvoltage Protection
+5V Output
6.8 Volts, limited duration
1ꢀ Volts, limited duration
16 Volts, limited duration
Current limited. Max. current and
VOUT Accuracy (50% loads):
+5V Output
12V Outputs
15V Outputs
1%
12V or 15V Outputs
Temperature Coefficient
Ripple/Noise (20MHz BW)
Line/Load Regulation
Efficiency
3%
Output Current
short-circuit duration are model
dependent
ꢁ.ꢁ2% per °C
See Ordering Guide
Storage Temperature
–40 to +105°C
+ꢀ00°C
See Ordering Guide
Lead Temperature (soldering, 10 sec.)
See Ordering Guide
15ꢁꢁVdc, minimum
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.
Isolation Voltage
Isolation Capacitance
Current Limiting
68ꢁpF (15ꢁꢁpF for TWR-5ꢀ1ꢁꢁꢁ-15ꢀ25ꢁ-D48A)
Auto-recovery
Overvoltage Protection
Dynamic Characteristics
Zenerꢀtransorb clamps, magnetic feedback
Transient Response (5ꢁ% load step) 2ꢁꢁμsec max. to 2% of final value
T E C H N I C A L N O T E S
Switching Frequency
Environmental
165kHz ( 15kHz)
Filtering and Noise Reduction
Operating Temperature (ambient):
Without Derating
With Derating
All TWR A-Series 12-15 Watt DC-DC Converters achieve their rated ripple
and noise specifications without the use of external inputꢀoutput capaci-
tors. In critical applications, inputꢀoutput ripple and noise may be further
reduced by installing electrolytic capacitors across the input terminals andꢀ
or low-ESR tantalum or electrolytic capacitors across the output terminals.
Output capacitors should be connected between their respective output pin
(pin 5, 6 or 8) and Common (pin 7) as shown in Figure 2. The caps should
be located as close to the power converters as possible. Typical values are
listed below. In many applications, using values greater than those listed
will yield better results.
–4ꢁ to +5ꢁ-7ꢁ°C (Model dependent)
to +1ꢁꢁ°C (See Derating Curve)
–4ꢁ to +1ꢁ5°C
Storage Temperature
Physical
Dimensions
2" x 2" x ꢁ.45" (51 x 51 x 11.4mm)
Shielding
5-sided
Case Connection
Pin 1 (+VIN)
Corrosion resistant steel with non-conductive,
epoxy-based, black enamel finish and plastic
baseplate
Case Material
Pin Material
Weight
Gold plate copper alloy with nickel underplate
2.6 ounces (74 grams)
To Reduce Input Ripple
1ꢁμF, 1ꢁꢁV
To Reduce Output Ripple
+5V Output
47μF, 1ꢁV, Low ESR
22μF, 2ꢁV, Low ESR
12ꢀ15V Outputs
These power converters require a minimum 1ꢁ% loading on their primary output and a
minimum 2ꢁ% loading on their auxiliary outputs to maintain specified regulation. Opera-
tion under no-load conditions will not damage these devices; however they may not meet
all listed specifications.
Application-specific internal inputꢀoutput filtering can be recommended and perhaps
added internally upon request. Contact Murato Power Solutions Applications Engineering
for details.
In critical, space-sensitive applications, Murata Power Solutions may be
able to tailor the internal inputꢀoutput filtering of these units to meet your
specific requirements. Contact our Applications Engineering Group for
additional details.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact Murato Power Solutions Applications Engineering for details.
www.murata-ps.com/support
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