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Dual Output BCP Models
3.3 and 2.5V, Half-Brick
50 Watt DC/DC Converters
FEATURES
■
Independent
■
Up
PRODUCT OVERVIEW
3.3V and 2.5V outputs
Murata Power Solutions' BCP "half-brick" series
has expanded to include dual-output, 3.3V and
2.5V DC/DC converters. The BCP-3.3/15-2.5/15-
D24 (18-36V input) and BCP-3.3/15-2.5/15-D48
(36-75V input) are fully isolated DC/DC convert-
ers housed in standard "half-brick" packages
(2.3" x 2.4" x 0.5"). These BCP’s can support
any combination of 3.3V and 2.5V loading up to
a combined total of 15 Amps. Both outputs are
fully isolated (1500Vdc) and independently line
(±0.2%) and load (±0.5%) regulated.
Both BCP models feature input pi filters, input
undervoltage and overvoltage shutdown, input
reverse-polarity protection, output overvoltage
protection, current limiting, and thermal shut-
down. Each has an on/off control function (positive
and negative logic versions available), and both
output voltages can be trimmed independently.
BCP Model DC/DCs deliver low noise (50mVp-p),
efficiency of 84% and are fully specified for –40 to
+100°C operation. Utilization of metal baseplate
technology with threaded inserts permits easy
heat-sink attachment and/or pcb mounting. These
devices meet UL1950 and IEC/EN60950-1 safety
standards, including BASIC insulation require-
ments. CB reports are available on request. "D48"
models are CE marked (meet the requirements
of LVD).
to 15 Amps per output
output fully regulated
minimum load requirements
Watts total output power
"half-brick" package
■
Each
■
No
■
50
■
Standard
■
UL1950
■
and IEC/EN60950-1 safety
approvals (BASIC insulation)
Fully isolated, 1500Vdc guaranteed
■
18-36V or 36-75V input ranges
■
mark available (75V-input models)
under and overvoltage shutdown
short-circuit protection
shutdown
■
Input
■
Continuous
■
Thermal
+INPUT
(4)
+3.3V OUTPUT
(7)
SWITCH
CONTROL
3.3V RETURN
(6)
+2.5V OUTPUT
(10)
–INPUT
(1)
REFERENCE
& ERROR AMP
2.5V RETURN
(9)
REGULATOR
ON/OFF
CONTROL
(3)
PWM
CONTROLLER
UV & OV
COMPARATORS
2.5V TRIM
(8)
OPTO
ISOLATION
REFERENCE
& ERROR AMP
3.3V TRIM
(5)
THERMAL
SHUTDOWN
Typical typology is shown.
For full details go to
www.murata-ps.com/rohs
Figure 1. Simplified Schematic
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MDC_BCP Models.B05
Page 1 of 7
Dual Output BCP Models
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
V
OUT
(Volts)
3.3
2.5
3.3
2.5
I
OUT
(Amps)
15
15
15
15
R/N (mVp-p)
➁
Typ.
50
50
50
50
Max.
100
100
100
100
Regulation (Max.)
➂
Line
±0.2%
±0.2%
±0.2%
±0.2%
Load
±0.5%
±0.5%
±0.5%
±0.5%
➃
➄
➅
➆
➀
3.3 and 2.5V, Half-Brick
50 Watt DC/DC Converters
Input
V
IN
Nom.
(Volts)
24
48
Range
(Volts)
18-36
36-75
I
IN
➃
(mA/A)
0.2/2.52
0.1/1.26
Efficiency
➅
Min.
82%
82%
Typ.
84%
84%
Package
(Case, Pinout)
C30, P90
C30, P90
Models
➆
BCP-3.3/15-2.5/15-D24
BCP-3.3/15-2.5/15-D48
➀
Typical at T
A
= +25°C under nominal line voltage and balanced "full-load" (3.3V @7.5A, 2.5V @ 7.5A)
conditions unless otherwise noted.
➁
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.
➂
No load to 100% load, other output at no-load.
Nominal line voltage, no-load/3.3V at full-load condition.
Current from either output at maximum value, or both outputs to a combined total of 15 A.
3.3V at full-load condition.
These are not complete model numbers. Please refer to the Part Number Structure when ordering.
Part Number Structure
Optional Functions
BCP 50 Watt DC/DC's are designed with an On/Off Control function, with
RoHS Hazardous
Dual Output/
either positive polarity (no suffix) or negative polarity ("N"suffix), in the
Substance Compliant
Standard Half-Brick Package
pin 3 position.
See Optional Functions
V
1
Nominal Output Voltage:
3.3 Volts
Blank
On/Off Control function (positive polarity) on pin 3
Input Voltage Range:
D24
= 18-36 Volts (24V nominal)
N
On/Off Control function (negative polarity) on pin 3
I
1
Maximum Output Current:
15A
D48
= 36-75 Volts (48V nominal)
L1
Pin length: 0.110 inches (2.79mm) ±0.010. Quantity order only.
I
2
Maximum Output Current:
15A
L2
Pin length: 0.145 inches (3.68mm) ±0.010. Quantity order only.
V
2
Nominal Output Voltage:
2.5 Volts
-C
RoHS-6 compliance
Note:
Not all model number combinations are available. Contact MPS.
BCP
-
3.3
-
15
-
2.5
/
15
-
D48 N LX
-
C
Mechanical Specifications
2.30
(58.42)
METAL BASEPLATE
0.50
(12.70)
Case C30
PLASTIC SHELL
0.20 MIN
(5.08)
0.040 ±0.002 DIA.
(1.016 ±0.051)
1.90
(48.26)
0.20
(5.08)
Dimensions are in inches (mm) shown for ref. only.
1
10
9
2
2.00
1.40
(50.80) (35.56)
8
1.600 2.40
1.300 (40.64) (60.96)
1.000 (33.02)
(25.40)
Third Angle Projection
1.00
(25.40)
0.40
(10.16)
3
(4) THREADED INSERTS
#M3 THD THRU
7
6
0.300
(7.62)
0.600
(15.24)
4
5
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
0.30
(7.62)
0.200
(5.08)
BOTTOM VIEW
Dimensions are in inches (MM)
0.20
(5.08)
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Dimensions in inches(mm)
MDC_BCP Models.B05
Page 2 of 7
Dual Output BCP Models
3.3 and 2.5V, Half-Brick
50 Watt DC/DC Converters
Mechanical Specifications
(continued)
Optional Heat Sink
(Part Number HS-CPLP2) *
3.50
(88.90)
2.000
(50.80)
0.75
(19.05)
0.20
(5.08)
1.900
(48.26)
2.30
(58.42)
I/O Connections
Pin Function P39
Pin
Function P39
1
–Input
6
3.3V Return
2 Case (Baseplate)
7
+3.3V Output
3
On/Off Control
8
2.5V Trim
4
+Input
9
2.5V Return
5
3.3V Trim
10
+2.5V Output
* Note:
When mounting the heat sink to the BCP converter:
1. Maximum applied torque is 6 in-lbs.
2. Minimum thread engagement of the mounting screws is 12mm deep.
Dimensions are in inches (mm) shown for ref. only.
0.140 THRU AND COUNTERSINK
90° TO 0.26 (4 PLACES)
Third Angle Projection
MATERIAL: BLACK ANODIZED ALUMINU
0.16
(4.06)
2.48
(62.99)
0.47
(11.94)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
Optional Heat Sink
(Part Number HS-CP) *
2.30
(58.42)
1.90
(48.26)
0.50 (12.70) TYP.
051 (12.95) MAX.
0.20
(5.08)
0.10
(2.54)
2.40
2.00
(50.80) (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
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MDC_BCP Models.B05
Page 3 of 7
Dual Output BCP Models
Performance/Functional Specifications
Input
3.3 and 2.5V, Half-Brick
50 Watt DC/DC Converters
Dynamic Characteristics
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
➀
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
D24 Models
D48 Models
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance <0.1Ω
22µF Low-ESR Capacitor
Input Filter Type
Reverse-Polarity Protection:
D24 Models
D48 Models
On/Off Control:
(Pin 3)
➂ ➄
D24 & D48 Models
D24N & D48N Models
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
40-43 Volts (41.5V typical)
77-80 Volts (78.5V typical)
16.5-18 Volts (17.5V typical)
33.5-36 Volts (34.5V typical)
15-17.5 Volts (16.5V typical)
30.5-33.5 Volts (32V typical)
See Ordering Guide
3.06 Amps maximum
1.53 Amps maximum
10mA typical
Dynamic Load Response:
3.3V (50-100% load step to 2% V
OUT
)
2.5V (50-100% load step to 2% V
OUT
)
Start-Up Time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
300µsec maximum
300µsec maximum
50 msec maximum
25 msec maximum
300kHz (±50kHz)
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
➁
Storage Temperature
Bellcore, ground fixed, controlled
TBD hours (case @ TBD °C)
TBD hours (case @ TBD °C)
TBD °C/Watt
–40 to +32°C (without heat sink)
To +100°C (See Derating Curves)
+100°C
+100°C minimum, +110°C maximum
–40 to +120°C
Physical
88mArms, 250mAp-p maximum
Pi (0.47µF-4.7µH-3.3µF)
1 minute duration, 6A maximum
1 minute duration, 3A maximum
On = open or 13V - +V
IN
, I
IN
= 1mA max.
Off = 0-0.8V, I
IN
= 2mA max.
On = 0-0.8V, I
IN
= 1mA max.
Off = open or 2.5 - +V
IN
, I
IN
= 50µA max.
Output
Dimensions
Case
(Baseplate) Connection
➁
Case/Pin Material
Weight
2.3" x 2.4" x 0.5" (58.4 x 61 x 12.7mm)
Pin 2
Diallyl phthalate, UL94V-0 rated, aluminum
baseplate; plated copper alloy pins
4.2 ounces (118 grams)
Primary to Secondary Insulation Level
Basic
➀
Balanced, full-load = 3.3 @ 7.5A and 2.5V @ 7.5A. Models are specified with an external 22µF,
low-ESR, input capacitor and 10µF tantalum in parallel with 1µF ceramic output capacitors.
➁
See Technical Notes for details.
➂
Devices may be ordered with negative logic (pin 3 open = off). See Part Number Structure
and Technical Notes for additional information.
➃
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➄
These signals must be referenced to the input return pin (–V
IN
).
➅
Demonstrated MTBF available on request.
V
OUT
Accuracy
3.3V Output
2.5V Output
Minimum Loading per Specification
Ripple/Noise
(20MHz BW)
➃
Line/Load Regulation
Efficiency
Trim Range
➁
Isolation Voltage:
Input-to-Baseplate
Input-to-Baseplate
Output-to-Case
Isolation Capacitance
Isolation resistance
Current Limit Inception:
3.3V @ 98% V
OUT
(2.5V @ no-load)
2.5V @ 98% V
OUT
(3.3V @ no-load)
Short Circuit Current
Temperature Coefficient
Overvoltage Protection:
3.3V Output
2.5V Output
±2% maximum
±2% maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide and Efficiency Curves
±5% independent
1500Vdc minimum
1000Vdc minimum
1000Vdc minimum
560pF
100MΩ
17-22 Amps
17-22 Amps
Constant current 25A, indefinite
±0.02% per °C
Comparator
4.0 Volts
3.25 Volts
Absolute Maximum Ratings
Input Voltage:
Continuous:
D24 Models
D48 Models
Transient (100msec): D24 Models
D48 Models
43 Volts
87 Volts
50 Volts
100 Volts
+15 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
6 Amps
3 Amps
4.0 Volts, comparator
3.25 Volts, comparator
Current limited. Devices can withstand
an indefinite output short circuit.
–40 to +120°C
See Soldering Guidelines
On/Off Control
Input Reverse-Polarity Protection
D24 Models
D48 Models
Output Overvoltage Protection
➁
3.3V Outputs
2.5V Outputs
Output Current
➁
Storage Temperature
Lead Temperature
These are stress ratings. Exposure of devices to greater than 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 or recommended.
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MDC_BCP Models.B05
Page 4 of 7
Dual Output BCP Models
3.3 and 2.5V, Half-Brick
50 Watt DC/DC Converters
TECHNICAL NOTES
3.3V & 2.5V Outputs/Returns
The BCP Series outputs (pins 7 & 10) and returns (pins 6 & 9) are isolated
from the +V
IN
and –V
IN
inputs (pins 4 & 1) via a transformer and opto-coupled
transistors.
The 3.3V Return (pin 6) and 2.5V 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.To maintain optimum regulation when a ground plane is
not used, it is critical that PC board layouts return each output to its corre-
sponding return pin.
Filtering and Noise Reduction
All BCP DC/DC Converters achieve their rated ripple and noise specifications
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. Input capacitors serve as energy-storage devices to minimize varia-
tions in line voltage caused by transient IR drops in PCB conductors from
backplane to the DC/DC. Output capacitors should be selected for low ESR and
appropriate frequency response. All caps should have appropriate voltage rat-
ings 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.
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 MPS 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
3 Amps
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 specification
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 1A, the control pin is referenced to the –Input (pin 1). 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 +0.8V
relative to –Input).
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink approximately 1mA for
logic low.
The on/off control function is designed such that the converter can be
disabled (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 a negative-polarity option ("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.
Fuses should be installed in the +Input line.
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.
+Vcc
+Vcc
3
ON/OFF
CONTROL
+13V
+3V
3
ON/OFF
CONTROL
1
–INPUT
1
–INPUT
Figure 1A. No Suffix
Figure 1B. "N" Suffix
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MDC_BCP Models.B05
Page 5 of 7
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