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BCP Models
75W , DU AL OUTPUT , MIXED-V OL T A GE DC/DC CONVER TERS
Performance/Functional Specications
Typical @ TA = +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
Input
Input Voltage Range:
D24 Models
18-36 Volts (24V nominal)
D48 Models
36-75 Volts (48V nominal)
Overvoltage Shutdown:
D24 Models
37.5-40.5 Volts (39V typical)
D48 Models
78.8-87.0 Volts (83V typical)
Start-Up Threshold:
D24 Models
15.5-18 Volts (16.5V typical)
D48 Models
33.5-36 Volts (34.4V typical)
Undervoltage Shutdown:
D24 Models
14-16 Volts (15.3V typical)
D48 Models
30.5-33.5 Volts (31.8V typical)
Input Current:
Normal Operating Conditions
See Ordering Guide
Minimum Input Voltage:
D24 Models
5.02 Amps maximum
D48 Models
2.51 Amps maximum
Standby Mode:
Off, OV, UV, Thermal Shutdown
17mA typical
Input Reected Ripple Current:
Source Impedance <0.1
22F Low-ESR Capacitor
53mArms, 150mAp-p maximum
Input Filter Type
Pi (0.47pF - 4.7H - 3F)
Reverse-Polarity Protection:
D24 Models
1 minute duration, 6A maximum
D48 Models
1 minute duration, 4A maximum
On/Off Control: (Pin 3)
D24 & D48 Models
On = open or 2.0 - +VIN, IIN = 50A max.
Off = 0-0.6V, IIN = 1mA max.
D24N & D48N" Models
On = 0-0.6V, IIN = 1mA max.
Off = open or 2.0 - +VIN, IIN = 50A max.
Sync (Option, Pin 3):
Input Threshold (Rising Edge Active)
0.9-1.8 Volts
Input Voltage Low
0-0.8 Volts
Input Voltage High
2.9-5.0 Volts
Input Resistance
35k
minimum
Output High Voltage (100A load)
2.1-2.8 Volts
Input/Output Pulse Width
200-450nsec
Output
VOUT Accuracy
5V Output
±2% maximum
3.3V Output
±2% maximum
Minimum Loading Per Specication
No load
Ripple/Noise (20MHz BW)
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efciency
See Ordering Guide and Efciency Curves
Trim Range
±10% independent
Isolation Voltage:
Input-to-Output
1500Vdc minimum
Input-to-Case
1000Vdc minimum
Output-to-Case
1000Vdc minimum
Isolation Capacitance
470pF
Isolation resistance
100M
Current Limit Inception:
5V @ 98% VOUT (3.3V no-load)
16-20 Amps
3.3V @ 98% VOUT (5V no-load)
16-20 Amps
Short Circuit Current:
Constant current 25A, indenite
Temperature Coefcient
±0.02% per °C
Output (continued)
Overvoltage Protection:
Magnetic feedback, latching
5V Output
6.8 volts
3.3V Output
4.5Volts
Dynamic Characteristics
Dynamic Load Response:
5V (50-100% load step to 1% VOUT)
450sec maximum
3.3V (50-100% load step to 1% VOUT)
450sec maximum
Start-Up Time:
VIN to VOUT
30msec maximum
On/Off to VOUT
20msec maximum
Switching Frequency
350kHz (±35kHz)
Environmental
MTBF
Bellcore, ground xed, controlled
D24 Models
1.49M hours (case @ 50°C)
D48 Models
1.72M hours (case @ 50°C)
Operating Temperature (Ambient):
θ Case to Ambient, No Heatsink
6.8°C/Watt
Without Derating
–40 to +45°C (with heat sink)
With Derating
To +100°C (See Derating Curves)
Case Temperature:
Maximum Allowable
+100°C
For Thermal Shutdown
+100°C minimum, +110°C maximum
Storage Temperature
–40 to +120°C
Physical
Dimensions
2.3" x 2.4" x 0.525" (58.4 x 61 x 13.3mm)
Case (Baseplate) Connection
Pin 2
Case/Pin Material
Diallyl phthalate, UL94V-0 rated, aluminum
baseplate; solder-tinned brass pins
Weight
4.2 ounces (118 grams)
Primary to Secondary Insulation Level Basic
Absolute Maximum Ratings
Models are specied at "full load" (5V & 3.3V @ 7.5A), with an external 22F, low-ESR,
input capacitor and 10F tantalum in parallel with 1F ceramic output capacitors.
See Technical Notes for details.
Devices may be ordered with opposite polarity (pin 3 open = off), or the On/Off Control
function can be replaced with a sync function. See Part Number Sufxes and Technical
Notes for additional information.
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
These signals must be referenced to the input return pin (–VIN).
Demonstrated MTBF available on request.
Input Voltage:
Continuous:
D24 Models
40.5 Volts
D48 Models
87 Volts
Transient (100msec): D24 Models
50 Volts
D48 Models
100 Volts
Input Reverse-Polarity Protection
Input Current must be limited. 1 minute
duration. Fusing recommended.
D24 Models
6 Amps
D48 Models
4 Amps
Output Overvoltage Protection
3.3V Outputs
3.8 Volts, latching
5V Outputs
6.2 Volts, latching
Output Current
Current limited. Devices can withstand
an indenite output short circuit.
Storage Temperature
–40 to +120°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 Specications Table is not implied, nor recommended.
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