Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage, nominal output voltage, natural air convection,
external caps and full-load conditions unless noted.
All models are tested/specifi ed with two external 0.047µF output capacitors. These capacitors
are necessary to accommodate our test equipment and may not be required to achieve speci-
fi ed performance in your applications. All models are stable and regulate within spec under
no-load conditions.
Input Refl ected Ripple Current is tested/specifi ed over a 20MHz bandwidth. Input fi ltering is
C
IN = 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 fi xed conditions, T
CASE = +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 +V
IN. The On/Off Control may be supplied with with
negative logic (LO = on, HI = off) using the "N" model suffi x.
Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airfl ow, 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 specifi cations, including cold start at –40°C.
Output noise may be further reduced by adding an external fi lter. 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 specifi cations 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.
Input
Input Voltage Range See Ordering Guide
Start-Up Threshold:
12V Models 9V minimum, 9.5V typical
24V Models 16.5V minimum, 17V typical
48V Models 34V minimum, 35V typical
Undervoltage Shutdown:
12V Models 8V minimum, 8.5V typical
24V Models 15.5V minimum, 16.3V typical
48V Models 32.5V minimum, 34.5V typical
Overvoltage Shutdown:
12V Models 20V typical, 21V maximum
24V Models 37V typical, 38V maximum
48V Models 78.5V typical, 81V maximum
Refl ected (Back) Ripple Current
12mA typical, 20mAp-p maximum
Input Current:
Full Load Conditions See Ordering Guide
No Load V
IN = nominal
12V and 24V Models 25mA typical, 50mA maximum
48V Models 170mA typical, 200mA maximum
Low-Line Voltage (V
IN = V MIN, full load) TBD
Remote On/Off Control
Positive Logic (no model suffi x) Off = ground pin to +1.2V maximum
On = open pin to +V
IN maximum
Current 2mA maximum
Negative Logic (N model suffi x) On = ground pin to +1.2V maximum
Off = open pin to +V
IN maximum
Current 18mA maximum
Output
VOUT Range See Ordering Guide
VOUT Accuracy:
3.3V or 5V Output ±1% of VNOM
±12V or ±15V Outputs ±10% of VNOM (See Technical Notes)
Temperature Coeffi cient ±0.02% of VOUT range/°C
Minimum Loading: See Technical Notes
3.3V or 5V Output No minimum load
±12V or ±15V Outputs 20% minimum of nominal output current,
balanced load
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide & Technical Notes
Effi ciency See Ordering Guide
Maximum Capacitive Loading:
3.3V or 5V Output TBD
±12V or ±15V Outputs TBD
Isolation:
Input to Output Voltage 1500Vdc minimum
Resistance 100MΩ
Capacitance 470pF
Isolation Safety Rating Functional insulation
Current Limit Inception: (98% of VOUT)
3.3V Output 5 Amps minimum, 6.2 Amps maximum
5V Output 4 Amps minimum, 5.3 Amps maximum
±12V Outputs 0.36 Amps minimum, 1 Amp maximum
±15V Outputs 0.36 Amps minimum, 0.9 Amps maximum
Short-Circuit Detection:
3.3V or 5V Output Magnetic feedback
±12V or ±15V Outputs 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 2 Amps maximum
±12V or ±15V Outputs 1 Amp maximum
Short Circuit Duration (no damage) Continuous, output shorted to ground
Overvoltage Protection:
3.3V Output 3.3V=3.8Vdc minimum, 4.2Vdc maximum
5V Output 5V= 6.2Vdc minimum, 7.7Vdc maximum
±12V or ±15V Outputs 30Vdc maximum
Method: magnetic feedback
Dynamic Characteristics
Dynamic Load Response (50-100% loadstep)
3.3V or 5V Output 150μsec to ±1.5% of fi nal value
±12V or ±15V Outputs 150μsec to ±10% of fi nal value
Start-Up Time
VIN to VOUT regulated TBD msec for VOUT = nominal
Switching Frequency 330kHz ±20kHz
Environmental
Calculated MTBF TBD
Operating Temperature: (Ambient)
No Derating (Natural convection) –40 to +65°C
With Derating 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
Relative Humidity 10% to 90%, non-condensing
Physical
Dimensions See Mechanical Specifi cations
Case and Header Material Black Diallyl Phthalate plastic
Pin Dimensions/Material 0.04" (1.016mm) dia. Gold-plated copper
alloy with nickel underplate.
Weight TBD
Electromagnetic Interference TBD
Safety Certifi ed to UL/cUL 60950-1 CSA-C22.2
No.234 IEC/EN 60950-1, 2nd Edition
Triple Output/
TWR Models
Isolated, High Reliability 1" x 2" DC/DC Converters
MDC_TWR22.C03 Page 3 of 9
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