PRELIMINARY
®
®
INNOVATION and EXCELLENCE
Dual Output
Mixed Voltage, BCP Models
3.3V and 2.5V, "Half-Brick"
50 Watt, DC/DC Converters
Features
■
■
■
■
■
■
■
Independent 3.3V and 2.5V outputs
Up to 15 Amps per output
Each output fully regulated
No minimum load requirements
50 Watts total output power
Standard "half-brick" package
UL1950 and IEC/EN60950 safety
approvals (BASIC insulation)
Fully isolated, 1500Vdc guaranteed
18-36V or 36-75V input ranges
mark available (75V-input models)
Input under and overvoltage shutdown
Continuous short-circuit protection
Thermal shutdown
■
■
■
■
■
■
DATEL's 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 converters 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 shut-
down, input reverse-polarity protection, output overvoltage protection, current limiting,
and thermal shutdown. Each has an on/off control function (positive and negative
logic versions available), and both output voltages can be trimmed independently.
BCP Model DC/DC’s 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 safety standards, including BASIC insulation
requirements. CB reports are available on request. "D48" models are CE marked
(meet the requirements of LVD).
+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
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
XCP Series
5 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide
V
OUT
(Volts)
3.3
2.5
3.3
2.5
➀
Input
Regulation (Max.)
Line
±0.2%
±0.2%
±0.2%
±0.2%
Model
BCP-3.3/15-2.5/15-D24
BCP-3.3/15-2.5/15-D48
I
OUT
➄
(Amps)
15
15
15
15
Output
R/N (mVp-p)
Typ.
50
50
50
50
Max.
100
100
100
100
Load
➂
±0.5%
±0.5%
±0.5%
±0.6%
➂
➃
➄
➅
V
IN
Nom.
(Volts)
24
48
Range
(Volts)
18-36
36-75
I
IN
➃
(Amps)
0.2/2.52
0.1/1.26
Efficiency
Min.
82%
82%
➅
Typ.
Package
(Case,
Pinout)
C30, P39
C30, P39
84%
84%
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.
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.
PA R T N U M B E R S T R U C T U R E
Optional Functions
BCP
-
3.3
-
15
-
2.5
/
15
-
D48 N LX
Dual Output/
Standard Half-Brick Package
V
1
Nominal Output Voltage:
3.3 Volts
I
1
Maximum Output Current:
15A
V
2
Nominal Output Voltage:
2.5 Volts
See Optional Functions
Input Voltage Range:
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
I
2
Maximum Output Current:
15A
BCP 50 Watt DC/DC's are designed with an On/Off Control function,
with either positive polarity (no suffix) or negative polarity ("N"suffix),
in the pin 3 position.
Blank
N
L1
L2
On/Off Control function (positive polarity) on pin 3
On/Off Control function (negative polarity) on pin 3
Pin length: 0.110 inches (2.79mm) ±0.010
Pin length: 0.145 inches (3.68mm) ±0.010
M E C H A N I C A L S P E C I F I C AT I O N S
Optional Heat Sink
(Part Number HS-CPLP2) *
3.50
(88.90)
2.30
(58.42)
METAL BASEPLATE
2.000
(50.80)
0.75
(19.05)
0.20
(5.08)
0.50
(12.70)
Case C30
PLASTIC SHELL
0.20 MIN
(5.08)
1.900
(48.26)
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.20
(5.08)
1.900
(48.26)
2.30
(58.42)
10
1
9
2
8
2.000 1.400
(50.80) (35.56)
1.000
(25.40)
0.400
(10.16)
4
(4) THREADED INSERTS
#M3 THD THRU
7
3
6
5
0.200
(5.08)
BOTTOM VIEW
0.20
(5.08)
0.300
(7.62)
0.600
(15.24)
1.000
(25.40)
2.40
1.600
1.300 (40.64) (60.96)
(33.02)
0.140 THRU AND COUNTERSINK
90˚ TO 0.26 (4 PLACES)
0.16
(4.06)
2.48
(62.99)
0.47
(11.94)
0.30
(7.62)
MATERIAL: BLACK ANODIZED ALUMINUM
Optional Heat Sink
(Part Number HS-CP) *
I/O Connections
Pin Function P39
Pin
1
–Input
6
2 Case (Baseplate)
7
3
On/Off Control
8
4
+Input
9
5
3.3V Trim
10
2.30
(58.42)
0.50 (12.70) TYP.
051 (12.95) MAX.
0.20
(5.08)
0.10
(2.54)
1.900
(48.26)
Function P39
3.3V Return
+3.3V Output
2.5V Trim
2.5V Return
+2.5V Output
2.000
(50.80)
2.40
(60.96)
* 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.
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
2
5 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
BCP Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
➀
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
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 Characteristics
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
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
300µsec maximum
300µsec maximum
50 msec maximum
25 msec maximum
300kHz (±50kHz)
Environmental
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
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.
Dimensions
Case
(Baseplate) Connection
➁
Case/Pin Material
Weight
Physical
2.3" x 2.4" x 0.5" (58.4 x 61 x 12.7mm)
Pin 2
Diallyl phthalate, UL94V-0 rated, aluminum
baseplate; solder-tinned brass 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.
Output
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
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
+300°C
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
(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.
3
XCP Series
5 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
TECHNICAL NOTES
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval between the time at which
a ramping 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
capacitance, 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 mechanical
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 dis-
abled (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.
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 corresponding 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 volt-
age 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 can
recommend potential solutions and can discuss the possibility of our modify-
ing 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
3 Amps
4
+INPUT
4
+INPUT
3
ON/OFF
CONTROL
+13V
+3V
3
ON/OFF
CONTROL
1
–INPUT
1
–INPUT
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).
Subsequent 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.
Input voltages exceeding the input overvoltage shutdown specification listed
in the Performance/Functional Specifications will cause the device to shut-
down. 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.
Figure 1A. No Suffix
Figure 1B. "N" Suffix
4
5 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
BCP Models
Output Overvoltage Protection
Each voltage output of the BCP Series converter is independently monitored
via an output comparator. If the output voltage should rise to a level
which could be damaging to the load circuitry (see Performance/Functional
Specifications for limits), the overvoltage circuitry will power down the PWM
controller causing the output voltages to collapse. Following a time out period
the converter will restart. If the fault condition persists the PWM will again
power down and the cycle will repeat. This on/off cycling is referred to as
a "hiccup-mode."
Case Connection
BCP DC/DC's do not connect the metal baseplate to an internal voltage. The
"uncommitted" baseplate is connected to pin 2 which, depending upon your
system configuration, should be connected to either +Input (pin 4), –Input (pin
1), Output Return (pins 6 & 9), or earth ground.
Thermal Shutdown
The BCP Series is equipped with Thermal Shutdown circuitry. If environmental
conditions cause the internal temperature of the DC/DC converter to rise
above the designed operating temperature (see Performance/Functional
Specifications), a precision temperature sensor will power down the unit.
When the internal temperature decreases below the threshold of the tem-
perature sensor the unit will self-start.
Input Reverse-Polarity Protection
Upon applying a reverse-polarity voltage to the DC/DC converter, an internal
diode will be forward biased and draw excessive current from the power
source. Therefore, it is required that the input current be limited be either an
appropriately rated input fuse or a current limited power source.
Heat Sinks for BCP Series
DATEL offers two standard heat sinks that can be mounted to the half-brick
package to extend the converter's operating temperature range. Along with
the standard 2.3" x 2.4" x 0.5" (HS-CP) heat sink, DATEL has designed
a low-profile heat sink for height-restricted applications. This new heat sink
(HS-CPLP2) is designed with radiant fins that extend 0.51" beyond either
side of the 2.4" dimension of the BCP package. The convenience of this
design is that the finned extensions protrude only 0.31" below the top surface
of the DC/DC converter, allowing components with a profile height less than
0.2" to be mounted on the pc board below the heat sink. Therefore, while
the surface area of the low-profile heat sink measures 2.3" x 3.5", pcb real
estate is unaffected.
For optimum thermal performance in a natural convection application, the
low-profile heat sink should be mounted with the fins vertically oriented. Both
models are shipped with 0.009" sellf-adhesive thermal pad and mounting
screws.
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.
6
˚
C
WATT
THERMAL RESISTANCE
5
4
HS-CPLP2
3
HS-CP
2
1
0
0
100
200
300
400
500
600
700
AIR VELOCITY (FT./MIN.)
Figure 2. HS-CP and HS-CPLP2 Heat Sink Performance Vs. Air Flow
5
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