POWER ELECTRONICS DIVISION
BCP Models
Dual Output, Mixed Voltage, 5V & 3.3V, "Half Brick", 75W DC/DC Converters
FEATURES
n
Independent 5V and 3.3V outputs
n
output fully regulated
Each
n
minimum load requirements
No
n
to 5 Amps per output
Up
n
Watts total output power
75
n
Standard "half-brick" package
n
UL950, EN60950 and VDE safety approvals
(BASIC insulation)
n
isolated, 500Vdc guaranteed
Fully
n
8-36V or 36-75V input ranges
n
mark available (75V-input models)
CE
n
under and overvoltage shutdown
Input
n
Continuous short-circuit protection
n
Thermal shutdown
PRODUCT OVERVIEW
As your new, mixed-logic (5V and 3.3V) design
evolves and your current requirements change,
your new DC/DC converter will not. DATEL’s BCP-
5/5-3.3/5-D24 (8-36V input) and BCP-5/5-
3.3/5-D48 (36-75V input) are fully isolated DC/DC
converters providing both 5V and 3.3V outputs.
Housed in standard "half-brick" packages (2.3"
x 2.4" x 0.525"), the BCP’s can support any com-
bination of 5V and 3.3V loading up to a combined
total of 5 Amps. Both outputs are fully isolated
(500Vdc) and independently line (±0.2%) and load
(±0.5% and ±0.6%) regulated.
Both BCP models feature input pi filters, input
undervoltage and overvoltage shutdown, input
reverse-polarity protection, output overvoltage
SIMPLIFIED SCHEMATIC
+INPUT
(4)
+5V OUTPUT
(7)
protection, current limiting, and thermal shutdown.
Each has an on/off control function, and the two
output voltages can be trimmed independently.
BCP Model DC/DC’s deliver low noise (50mVp-p),
high efficiency (87%) and are fully specified for –40
to +00°C operation. Utilization of metal baseplate
technology with threaded inserts permits easy
heat-sink attachment and/or pcb mounting. These
devices meet IEC950, UL950, EN60950 and
VDE safety standards, including BASIC insulation
requirements. CB reports are available on request.
"D48" models are CE marked (meet the require-
ments of LVD). Selected models are available with
RoHS-6 hazardous substance compliance.
SWITCH
CONTROL
5V RETURN (6)
+3.3V OUTPUT
(10)
–INPUT
(1)
MAG AMP
CONTROLLER
REFERENCE &
ERROR AMP
3.3V RETURN
(9)
ON/OFF
CONTROL
(3)
PWM
CONTROLLER
UV & OV
COMPARATORS
3.3V TRIM
(8)
OPTO
ISOLATION
REFERENCE &
ERROR AMP
5V TRIM
(5)
DC/DC CONVERTERS
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POWER ELECTRONICS DIVISION
BCP Models
Dual Output, Mixed Voltage, 5V & 3.3V, "Half Brick", 75W DC/DC Converters
Output
Input
Regulation (Max.)
Line
±0.2%
±0.2%
±0.2%
±0.2%
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
R/N (mVp-p)
Typ.
50
50
50
50
Model Family
BCP-5/15-3.3/15-D24
V
OUT
(V)
5
3.3
5
3.3
I
OUT
(A)
5
5
5
5
Max.
00
00
00
00
Load
±0.5%
±0.6%
±0.5%
±0.6%
V
IN
Nom.
(V)
24
Range
(V)
8-36
I
IN
(mA)
25/3720
Efficiency
Min.
84%
Typ.
87.2%
Package
(Case/
Pinout)
C9, P29
BCP-5/15-3.3/15-D48
48
25/860
25/860
84%
88%
C9, P29
Typical at T
A
= +25°C under nominal line voltage and balanced "full-load" (5V @7.5A, 3.3V @ 7.5A)
conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth. All models are specified with 22µF, low-ESR,
input capacitor and 10µF tantalum in parallel with 1µF ceramic output capacitors.
No load to 100% load, other output at no-load.
Nominal line voltage, no-load/5V at full-load condition.
Current from either output at maximum value, or both outputs to a combined total of 15 A.
5V at full-load condition.
Available with RoHS-5 compliance.
PART NUMBER STRUCTURE
BCP
-
5
/
15
-
3.3
/
15
-
D24 N LX
-
C
-
T
Dual Output/
Standard Half-Brick
V
1
Nominal Output Voltage:
5V
I
1
Maximum Output Current:
15A
V
2
Nominal Output Voltage:
3.3V
I
2
Maximum Output Current:
15A
Special Trim Versions:
BCP-5/15-3.3/15-D48 only
RoHS Compliance*
Optional Functions:
See also last page
Input Voltage Range:
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
Blank
N
L
L2
-Y
-C
Optional Functions
Refer to last page for additional options
On/Off Control function (positive polarity) pin 3
On/Off Control function (negative polarity) pin 3
Pin length: 0.0 in. (2.79mm) ±0.00
Pin length: 0.45 in. (3.68mm) ±0.00
RoHS-5 Hazardous substance compliance, with lead
RoHS-6 Hazardous substance compliance, no lead
* Contact C&D Technologies for availability.
Note:
Not all model number combinations
are available. Contact C&D.
DC/DC CONVERTERS
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POWER ELECTRONICS DIVISION
BCP Models
Dual Output, Mixed Voltage, 5V & 3.3V, "Half Brick", 75W DC/DC Converters
Optional Heat Sink
(Part Number HS-CPLP2)
MECHANICAL SPECIFICATIONS
2.30
(58.42)
METAL BASEPLATE
0.545 (13.84) MAX.
0.525 (13.34) TYP.
PLASTIC SHELL
0.20 MIN
(5.08)
1.900
(48.26)
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.20
(5.08)
1
10
9
2
2.000 1.400
(50.80) (35.56)
8
2.40
1.600
1.300 (40.64) (60.96)
(33.02)
1.000
(25.40)
0.400
(10.16)
3
7
6
0.600
(15.24)
1.000
(25.40)
4
(4) THREADED INSERTS
#M3 THD THRU
5
0.300
(7.62)
0.30
(7.62)
0.200
(5.08)
BOTTOM VIEW
0.20
(5.08)
Optional Heat Sink
(Part Number HS-CP)
2.30
(58.42)
1.900
(48.26)
0.50 (12.70) TYP.
051 (12.95) MAX.
0.20
(5.08)
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
Pin
2
3
4
5
INPUT/OUTPUT CONNECTIONS
Function
Pin
Function
-Input
Case (Baseplate)
On/Off Control
+Input
5V Trim
6
7
8
9
0
5V Return
+5V Output
3.3V Trim
3.3V Return
+3.3V Output
2.000
(50.80)
2.40
(60.96)
TOP VIEW
0.147 DIA. (3.734)
(4 PLACES)
0.20
(5.08)
MATERIAL: BLACK ANODIZED ALUMINUM
4 MOUNTING SCREWS AND 0.009 (0.229)
THICK THERMAL PAD INCLUDED
DC/DC CONVERTERS
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Page 3 of 3
POWER ELECTRONICS DIVISION
BCP Models
Dual Output, Mixed Voltage, 5V & 3.3V, "Half Brick", 75W DC/DC Converters
Dynamic Characteristics
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
Input
Input Voltage Range:
D24 Models
D48 Models
Overvoltage Shutdown:
D24 Models
D48 Models
Start-Up Threshold:
D24 Models
D48 Models
Undervoltage Shutdown:
D24 Models
D48 Models
Input Current:
Normal Operating Conditions
Minimum Input Voltage:
D24 Models
D48 Models
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance <0.Ω
22µF Low-ESR Capacitor
Input Filter Type
Reverse-Polarity Protection:
D24 Models
D48 Models
On/Off Control:
(Pin 3)
D24 & D48 Models
D24N & D48N" Models
8-36 Volts (24V nominal)
36-75 Volts (48V nominal)
37.5-40.5 Volts (39V typical)
78.8-87.0 Volts (83V typical)
5.5-8 Volts (6.5V typical)
33.5-36 Volts (34.4V typical)
4-6 Volts (5.3V typical)
30.5-33.5 Volts (3.8V typical)
See Ordering Guide
5.02 Amps maximum
2.5 Amps maximum
7mA typical
Dynamic Load Response:
5V (50-00% load step to % V
OUT
)
3.3V (50-00% load step to % V
OUT
)
Start-Up Time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
450µsec maximum
450µsec maximum
30msec maximum
20msec maximum
350kHz (±35kHz)
Bellcore, ground fixed, controlled
.49M hours (case @ 50°C)
.72M hours (case @ 50°C)
6.8°C/Watt
–40 to +45°C (with heat sink)
To +00°C (See Derating Curves)
+00°C
+00°C minimum, +0°C maximum
–40 to +20°C
2.3"x2.4" x 0.525" (58.4x6x3.3mm)
Pin 2
Diallyl phthalate, UL94V-0 rated,
aluminum baseplate; gold plate pins
with nickel underplate
4.2 ounces (8 grams)
Basic
Environmental
MTBF
D24 Models
D48 Models
Operating Temperature
(Ambient):
θ
Case to Ambient, No Heatsink
Without Derating
With Derating
Case Temperature:
Maximum Allowable
For Thermal Shutdown
Storage Temperature
53mArms, 50mAp-p maximum
Pi (0.47pF - 4.7µH - 3µF)
minute duration, 6A maximum
minute duration, 4A maximum
On = open or 2.0 - +V
IN
, I
IN
= 50µA max.
Off = 0-0.6V, I
IN
= mA max.
On = 0-0.6V, I
IN
= mA max.
Off = open or 2.0 - +V
IN
, I
IN
= 50µA max.
Physical
Dimensions
Case
(Baseplate) Connection
Case/Pin Material
Weight
Primary to Secondary Insulation Level
Output
V
OUT
Accuracy
5V Output
3.3V Output
Minimum Loading Per Specification
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Curves
Trim Range
Isolation Voltage:
Input-to-Output
Input-to-Case
Output-to-Case
Isolation Capacitance
Isolation resistance
Current Limit Inception:
5V @ 98% V
OUT
(3.3V no-load)
3.3V @ 98% V
OUT
(5V no-load)
Short Circuit Current:
Temperature Coefficient
Overvoltage Protection:
5V Output
3.3V Output
±2% maximum
±2% maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide and Efficiency
±0% independent
500Vdc minimum
000Vdc minimum
000Vdc minimum
470pF
00MΩ
6-20 Amps
6-20 Amps
Constant current 25A, indefinite
±0.02% per °C
Magnetic feedback, latching
6.8 volts
4.5Volts
Models are specified at "full load" (5V & 3.3V @ 7.5A), with an external 22µF, low-ESR,
input capacitor and 10µF tantalum in parallel with 1µF ceramic output capacitors.
See Technical Notes for details.
Devices may be ordered with opposite polarity (pin 3 open = off). See Part Number
Suffixes 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 (–V
IN
).
Demonstrated MTBF available on request.
Absolute Maximum Ratings
Input Voltage:
Continuous:
D24 Models
D48 Models
Transient (100msec): D24 Models
D48 Models
40.5 Volts
87 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
6 Amps
4 Amps
3.8 Volts, latching
6.2 Volts, latching
Current limited. Devices can withstand
an indefinite output short circuit.
–40 to +120°C
+300°C
Input Reverse-Polarity Protection
D24 Models
D48 Models
Output Overvoltage Protection
3.3V Outputs
5V Outputs
Output Current
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
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.
DC/DC CONVERTERS
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Page 4 of 3
POWER ELECTRONICS DIVISION
BCP Models
Dual Output, Mixed Voltage, 5V & 3.3V, "Half Brick", 75W DC/DC Converters
Input voltages exceeding the input overvoltage shutdown specification
listed in the Performance/Functional Specifications will cause the device to
shutdown. A built-in hysteresis (2V typical for "D24" models, 4V typical for
"D48" models) will not allow the converter to restart until the input voltage is
sufficiently reduced.
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval between the time at which a ramp-
ing input voltage crosses the turn-on threshold point and the fully-loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and final value of the input voltage as it appears to
the converter.
The On/Off to V
OUT
start-up time assumes the converter has its nominal
input voltage applied but is turned off via the On/Off Control. The specifica-
tion defines the interval between the time at which the converter is turned on
and the fully loaded output voltage enters and remains within its specified
accuracy band.
On/Off Control
(Standard feature)
The On/Off Control (pin 3) may be used for remote on/off operation. As
shown in Figure A, the control pin is referenced to the –Input (pin ) and
will be pulled to a high state internally. The standard BCP converter (no
suffix) is designed so that it is enabled when the control pin is left open and
disabled when the control pin is pulled low (to less than +0.6V relative to
–Input).
Dynamic control of the on/off function is best accomplished with a mechan-
ical relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink approximately mA for
logic low.
The on/off control function is designed such that the converter can be disa-
bled (pin 3 pulled low for no-suffix models) while input power is ramping up
and then "released" once the input has stabilized.
For BCP converters configured with the negative-polarity option on the
On/Off Control pin ("N" suffix added to part number), operation is opposite
to that described above. The converter is disabled when the On/Off Control
pin is left open and enabled when pulled low.
3.3V
TECHNICAL NOTES
5V & 3.3V Outputs/Returns
The BCP Series outputs (pins 7 & 0) and returns (pins 6 & 9) are isolated
from the +V
IN
and –V
IN
inputs (pins 4 & ) via a transformer and opto-cou-
pled transistors.
The +5V Return (pin 6) and +3.3V Return (pin 9) are connected internal to
the DC/DC converter. Though the returns are common within the DC/DC
converter, the regulating control loop for each output is sensed directly at
its respective output and return pins. In order to maintain optimum regula-
tion if ground plane is not used, it is critical that PC board layouts also
return each output to its corresponding return pin.
Filtering and Noise Reduction
All BCP DC/DC Converters achieve their rated ripple and noise specifi-
cations using the external input and output capacitors specified in the
Performance/Functional Specifications table. In critical applications,
input/output noise may be further reduced by installing additional external
I/O caps. Input capacitors should be selected for bulk capacitance, low ESR
and high rms-ripple-current ratings. Output capacitors should be selected
for low ESR and appropriate frequency response. All caps should have
appropriate voltage ratings and be mounted as close to the converters as
possible.
The most effective combination of external I/O capacitors will be a function of
your particular load and layout conditions. Our Applications Engineers will be
pleased to recommend potential solutions and can discuss the possibility of
our modifying a device’s internal filtering to meet your specific requirements.
Contact our Applications Engineering Group for additional details.
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL BCP DC/DC Converters, you should use slow-
blow type fuses with values no greater than the following.
V
IN
Range
"D24" Models
"D48" Models
Fuse Value
6 Amps
4 Amps
Fuses should be installed in the +Input line.
4
+INPUT
21k
4
+INPUT
100k
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until the
ramping-up input voltage exceeds the Start-Up Threshold Voltage (35V for
"D48" models). Once operating, devices will not turn off until the input voltage
drops below the Undervoltage Shutdown limit (32V for "D48" models). Subse-
quent re-start will not occur until the input is brought back up to the
Start-Up Threshold. This built-in hysteresis prevents any unstable on/off
situations from occurring at a single voltage.
3
ON/OFF
CONTROL
3
ON/OFF
CONTROL
1
1
–INPUT
–INPUT
Figure 1A. No Suffix
Figure 1B. "N" Suffix
DC/DC CONVERTERS
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