TWR-3.3 查看數據表（PDF） - Murata Power Solutions
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TWR-3.3 Datasheet PDF : 9 Pages
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Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection,
external caps and full-load conditions unless noted.
Input
Input Voltage Range
See Ordering Guide
Start-Up Threshold:
12V Models
24V Models
48V Models
9V minimum, 9.5V typical
16.5V minimum, 17V typical
34V minimum, 35V typical
Undervoltage Shutdown:
12V Models
24V Models
48V Models
8V minimum, 8.5V typical
16V minimum, 16.5V typical
32.5V minimum, 34.5V typical
Overvoltage Shutdown:
12V Models
24V Models
48V Models
20V typical, 21V maximum
38V typical, 40V maximum
78.5V typical, 81V maximum
Reflected (Back) Ripple Current
12mA typical, 20mAp-p maximum
Input Current:
Full Load Conditions
No Load VIN = nominal
12V and 24V Models
48V Models
Low-Line Voltage (VIN =VMIN, full load)
See Ordering Guide
25mA typical, 50mA maximum
170mA typical, 200mA maximum
TBD
Remote On/Off Control
Positive Logic (no model suffix)
Current
Negative Logic (N model suffix)
Current
Off = ground pin to +1.2V maximum
On = open pin to +VIN maximum
2mA maximum
On = ground pin to +1.2V maximum
Off = open pin to +VIN maximum
18mA maximum
Output
VOUT Range
See Ordering Guide
VOUT Accuracy:
3.3V or 5V Output
±12V or ±15V Outputs
±1% of VNOM
±10% of VNOM (See Technical Notes)
Temperature Coefficient
±0.02% of VOUT range/°C
Minimum Loading:
3.3V or 5V Output
±12V or ±15V Outputs
See Technical Notes
No minimum load
20% minimum of nominal output current,
balanced load
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide & Technical Notes
Efficiency
See Ordering Guide
Maximum Capacitive Loading:
3.3V or 5V Output
TBD
±12V or ±15V Outputs
TBD
Isolation:
Input to Output Voltage
Resistance
Capacitance
Isolation Safety Rating
1500Vdc minimum
100M7
470pF
Functional insulation
Current Limit Inception: (98% of VOUT)
3.3V Output
5V Output
±12V Outputs
±15V Outputs
5 Amps minimum, 6.2 Amps maximum
4 Amps minimum, 5.2 Amps maximum
0.36 Amps minimum, 1 Amp maximum
0.5 Amps minimum, 1.2 Amps maximum
Short-Circuit Detection:
3.3V or 5V Output
±12V or ±15V Outputs
Magnetic feedback
Magnetic feedback plus voltage clamp
Short-Circuit Potection Method
Current limiting with hiccup autorestore.
Remove overload for recovery.
Short-Circuit Current:
3.3V or 5V Output
±12V or ±15V Outputs
2 Amps maximum
1 Amp maximum
www.murata-ps.com
Triple Output/TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
Short Circuit Duration (no damage)
Overvoltage Protection:
3.3V or 5V Output
±12V or ±15V Outputs
Continuous, output shorted to ground
3.8Vdc minimum, 4.2Vdc maximum
30Vdc maximum
Method: magnetic feedback
Dynamic Characteristics
Dynamic Load Response (50-100% loadstep)
3.3V or 5V Output
150μsec to ±1.5% of final value
±12V or ±15V Outputs
150μsec to ±10% of final value
Start-Up Time
VIN to VOUT regulated
Switching Frequency
TBD msec for VOUT = nominal
330kHz ±20kHz
Environmental
Calculated MTBF
TBD
Operating Temperature: (Ambient)
No Derating (Natural convection)
With Derating
–40 to +65°C
See Derating Curves
Operating Case Temperature
–40 to +100°C maximum
Storage Temperature
–40 to +120°C
Thermal Protection/Shutdown
+110°C minimum to 120°C maximum
Density Altitude
Relative Humidity
0 to 10,000 feet
10% to 90%, non-condensing
Dimensions
Case and Header Material
Pin Dimensions/Material
Physical
See Mechanical Specifications
Black Diallyl Phthalate plastic
0.04" (1.016mm) dia. Gold-plated copper
alloy with nickel underplate.
Weight
Electromagnetic Interference
Safety
TBD
TBD
UL/cUL 60950-1 CSA-C22.2 No.234
IEC/EN 60950-1
All models are tested/specified with two external 0.047μF output capacitors. These capacitors
are necessary to accommodate our test equipment and may not be required to achieve speci-
fied performance in your applications. All models are stable and regulate within spec under
no-load conditions.
Input Reflected Ripple Current is tested/specified over a 20MHz bandwidth. Input filtering is
CIN = 33μF, 100V tantalum; CBUS = 220μF, 100V electrolytic; LBUS = 12μH. See Technical Notes.
For consistent operation, the instantaneous input voltage for full output load must not go below
the low shutdown voltage AT ALL TIMES. Beware of excessive voltage drop from long input
wiring. For reliable startup, be sure to apply input power promptly and fully as a step function.
Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case
3, ground fixed conditions, TCASE = +25°C, full load, natural air convection.
The On/Off Control may be driven with external logic or the application of appropriate voltages
(referenced to Common). The On/Off Control input should use either an open collector/open drain
transistor or logic gate which does not exceed +VIN. The On/Off Control may be supplied with with
negative logic (LO = on, HI = off) using the "N" model suffix.
Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if
the total RMS current over time does not exceed the derating curve.
All models are fully operational and meet published specifications, including cold start at –40°C.
Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise
Reduction.
The outputs share a common isolated return. The two output sections are not isolated from
each other.
Regulation specifications describe the deviation as the line input voltage or output load current
is varied from a nominal midpoint value to either extreme.
The outputs will not accept appreciable reverse current without possible damage.
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_TWR22.B02 Page 3 of 9
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