35W, DUAL OUTPUT DC/DC CONVERTERS
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage, balanced "full-load" conditions, unless noted. ➀
Input
Input Voltage Range:
D24 Models
D48 Models
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
Overvoltage Shutdown:
D24 Models
D48 Models
36.4-43.6 Volts (40V nominal)
77-85 Volts (83V nominal)
Input Current:
Normal Operating Conditions
Standby Mode:
Off, OV, Thermal Shutdown
See Ordering Guide
10mA typical
Input Reflected Ripple Current:
Source Impedance
D24 & D48 Models
<0.1Ω, no external input filtering
100mAp-p (typical)
Internal Input Filter Type
Pi (4.5µF - 10µH - 7.5µF)
Reverse-Polarity Protection:
D24 Models
D48 Models
1 minute duration, 3A maximum
1 minute duration, 2A maximum
On/Off Control (Pin 5): ➂ ➃ ➅
D24 & D48 Models
On = open or 2.6V - +VIN, IIN = 1.5mA max.
Off = 0-1.2V, IIN = 1.5mA max.
Output
VOUT Accuracy
5V Output
3.3V Output
±1% maximum
±1.5% maximum
Minimum Loading Per Specification 10%
Ripple/Noise (20MHz BW) ➄
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Trim Range +5V Output
±5%
Isolation Voltage:
Input-to-Output
Case-to-Input
Case-to-Output
1500Vdc minimum
1000Vdc minimum
1000Vdc mimimum
Isolation Capacitance
470pF
Isolation Resistance
100MΩ
Temperature Coefficient
±0.02%/per°C
Output (continued)
Current Limit Inception:
5V @ 98.5% VOUT (3.3V @ 3.5A)
3.3V @ 98.5% VOUT (5V @ 4.7A)
6-8 Amps
5-8 Amps
Short Circuit Current:
5V Output
3.3V Output
10 Amps average, continuous
8 Amps average, continuous
Overvoltage Protection:
5V Output
Magnetic feedback/transorb
6.8 volts
Dynamic Characteristics
Dynamic Load Response:
5V (50-100% load step to 3% VOUT)
3.3V (50-100% load step to 3% VOUT)
300µsec maximum
300µsec maximum
Switching Frequency
150kHz (±15kHz)
BMP Models
Environmental
MTBF ➆
D24 Models
D48 Models
Bellcore, ground fixed, full power, +25°C
operating ambient temperature
TBC million hours
TBC million hours
Operating Temperature (Ambient): ➁
Without Derating:
With Derating
No heat sink
–40 to +50°C
To +100°C (See Derating Curves)
Case Temperature:
Maximum Operational
For Thermal Shutdown
+100°C
+95°C minimum, +105°C maximum
Storage Temperature
–40 to +120°C
Physical
Dimensions
2.04 x 3.04 x 0.55" (51.8 x 77.2 x 14mm)
Shielding
5-sided
Case Connection
Pin 4
Case Material
Aluminum, black anodized finish
with plastic header
Pin Material
Brass, solder coated
Weight:
6 ounces (170 grams)
Primary to Secondary Insulation Level
D24 Models
Operational
D48 Models
Basic
➀ All models are specified with no external output capacitors.
➁ See Technical Notes/Graphs for details.
➂ Devices may be ordered with On/Off Control function or a Sync function.
See Part Number Suffixes and Technical Notes for details.
➃ Applying a voltage to On/Off Control (pin 5) when no input power is applied to the
converter may cause permanent damage.
➄ Output noise may be further reduced with the installation of additional external output
capacitors.
➅ On/Off control is designed to be driven with open collector or by appropriate voltage
levels. Voltages must be referenced to the input return pin (–Input).
➆ Demonstrated MTBF available on request.
Absolute Maximum Ratings
Input Voltage:
D24 Models
D48 Models
42 Volts
88 Volts
Input Reverse-Polarity Protection
Current must be <3A. Brief duration
only. Fusing recommended.
Output Overvoltage Protection
+5V Outputs
6.8 Volts
Output Current
Current limited. Maximum current and
short-circuit duration are model
dependent.
Storage Temperature
–40 to +105°C
Lead Temperature (Soldering, 10 sec.) +300°C
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, nor recommended.
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