Dual Output BCP Models www.murata-ps.com 3.3 and 2.5V, Half-Brick 50 Watt DC/DC Converters OBSOLETE PRODUCT Last time buy: 04 January 2013 FEATURES PRODUCT OVERVIEW ■ Independent ■ Up 3.3V and 2.5V outputs 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/EN60950-1 safety approvals (BASIC insulation) ■ Fully isolated, 1500Vdc guaranteed ■ 18-36V ■ or 36-75V input ranges mark available (75V-input models) ■ Input Murata Power Solutions' BCP "half-brick" series has expanded to include dual-output, 3.3V and 2.5V DC/DC converters. The BCP-3.3/15-2.5/15D24 (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 shutdown, 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/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 requirements. CB reports are available on request. "D48" models are CE marked (meet the requirements of LVD). under and overvoltage shutdown ■ Continuous ■ Thermal short-circuit protection shutdown +3.3V OUTPUT (7) +INPUT (4) SWITCH CONTROL 3.3V RETURN (6) +2.5V OUTPUT (10) –INPUT (1) 2.5V RETURN (9) ON/OFF CONTROL (3) REGULATOR PWM CONTROLLER UV & OV COMPARATORS OPTO ISOLATION THERMAL SHUTDOWN REFERENCE & ERROR AMP REFERENCE & ERROR AMP 2.5V TRIM (8) 3.3V TRIM (5) Typical typology is shown. For full details go to www.murata-ps.com/rohs Figure 1. Simplified Schematic www.murata-ps.com/support MDC_BCP Models.B06 Page 1 of 7 Dual Output BCP Models Performance Specifications and Ordering Guide 3.3 and 2.5V, Half-Brick 50 Watt DC/DC Converters ➀ ORDERING GUIDE Output Models ➆ VOUT (Volts) IOUT (Amps) 3.3 2.5 3.3 2.5 15 15 15 15 BCP-3.3/15-2.5/15-D24 BCP-3.3/15-2.5/15-D48 R/N (mVp-p) ➁ Input Regulation (Max.) ➂ Typ. Max. Line Load 50 50 50 50 100 100 100 100 ±0.2% ±0.2% ±0.2% ±0.2% ±0.5% ±0.5% ±0.5% ±0.5% ➀ Typical at TA = +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. Efficiency ➅ VIN Nom. (Volts) Range (Volts) IIN ➃ (mA/A) Min. Typ. Package (Case, Pinout) 24 18-36 0.2/2.52 82% 84% C30, P90 48 36-75 0.1/1.26 82% 84% C30, P90 ➃ ➄ ➅ ➆ 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 V1 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 I1 Maximum Output Current: 15A D48 = 36-75 Volts (48V nominal) L1 Pin length: 0.110 inches (2.79mm) ±0.010. Quantity order only. I2 Maximum Output Current: 15A L2 Pin length: 0.145 inches (3.68mm) ±0.010. Quantity order only. V2 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) 0.50 (12.70) METAL BASEPLATE Case C30 PLASTIC SHELL 0.040 ±0.002 DIA. (1.016 ±0.051) 0.20 MIN (5.08) 0.20 (5.08) 1.90 (48.26) Dimensions are in inches (mm) shown for ref. only. 10 1 Third Angle Projection 9 2 2.00 1.40 (50.80) (35.56) 1.00 (25.40) 8 7 3 0.40 (10.16) 6 4 0.30 (7.62) (4) THREADED INSERTS #M3 THD THRU 5 0.300 (7.62) 0.600 (15.24) 1.600 2.40 1.300 (40.64) (60.96) 1.000 (33.02) (25.40) 0.200 (5.08) BOTTOM VIEW Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ Components are shown for reference only. 0.20 (5.08) Dimensions are in inches (MM) www.murata-ps.com/support Dimensions in inches(mm) MDC_BCP Models.B06 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) 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 2.30 (58.42) * 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 0.47 (11.94) 0.16 (4.06) Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ 2.48 (62.99) Components are shown for reference only. Optional Heat Sink (Part Number HS-CP) * 2.30 (58.42) 0.50 (12.70) TYP. 051 (12.95) MAX. 1.90 (48.26) 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 www.murata-ps.com/support MDC_BCP Models.B06 Page 3 of 7 Dual Output BCP Models 3.3 and 2.5V, Half-Brick 50 Watt DC/DC Converters Performance/Functional Specifications Typical @ TA = +25°C under nominal line voltage, balanced "full-load" conditions, unless noted. ➀ Dynamic Characteristics Input 18-36 Volts (24V nominal) 36-75 Volts (48V nominal) Dynamic Load Response: 3.3V (50-100% load step to 2% VOUT) 2.5V (50-100% load step to 2% VOUT) 300µsec maximum 300µsec maximum Overvoltage Shutdown: D24 Models D48 Models 40-43 Volts (41.5V typical) 77-80 Volts (78.5V typical) Start-Up Time: VIN to VOUT On/Off to VOUT 50 msec maximum 25 msec maximum Start-Up Threshold: D24 Models D48 Models Switching Frequency 300kHz (±50kHz) 16.5-18 Volts (17.5V typical) 33.5-36 Volts (34.5V typical) Input Voltage Range: 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 15-17.5 Volts (16.5V typical) 30.5-33.5 Volts (32V typical) Bellcore, ground fixed, controlled TBD hours (case @ TBD °C) TBD hours (case @ TBD °C) See Ordering Guide 3.06 Amps maximum 1.53 Amps maximum Operating Temperature (Ambient): θ Case to Ambient, No heatsink Without Derating With Derating TBD °C/Watt –40 to +32°C (without heat sink) To +100°C (See Derating Curves) Case Temperature: Maximum Allowable For Thermal Shutdown ➁ +100°C +100°C minimum, +110°C maximum 10mA typical Input Reflected Ripple Current: Source Impedance <0.1Ω 22µF Low-ESR Capacitor 88mArms, 250mAp-p maximum Input Filter Type Pi (0.47µF-4.7µH-3.3µF) Reverse-Polarity Protection: D24 Models D48 Models On/Off Control: (Pin 3) ➂ ➄ D24 & D48 Models D24N & D48N Models Storage Temperature 1 minute duration, 6A maximum 1 minute duration, 3A maximum On = open or 13V - +VIN, IIN = 1mA max. Off = 0-0.8V, IIN = 2mA max. On = 0-0.8V, IIN = 1mA max. Off = open or 2.5 - +VIN, IIN = 50µA max. Output VOUT Accuracy 3.3V Output 2.5V Output Environmental MTBF D24 Models D48 Models ±2% maximum ±2% maximum Minimum Loading per Specification No load Ripple/Noise (20MHz BW) ➃ See Ordering Guide Line/Load Regulation See Ordering Guide Efficiency See Ordering Guide and Efficiency Curves Trim Range ➁ ±5% independent Isolation Voltage: Input-to-Baseplate Input-to-Baseplate Output-to-Case 1500Vdc minimum 1000Vdc minimum 1000Vdc minimum Isolation Capacitance 560pF Isolation resistance 100MΩ Current Limit Inception: 3.3V @ 98% VOUT (2.5V @ no-load) 2.5V @ 98% VOUT (3.3V @ no-load) 17-22 Amps 17-22 Amps Short Circuit Current Constant current 25A, indefinite Temperature Coefficient ±0.02% per °C Overvoltage Protection: 3.3V Output 2.5V Output Comparator 4.0 Volts 3.25 Volts –40 to +120°C Physical Dimensions 2.3" x 2.4" x 0.5" (58.4 x 61 x 12.7mm) Case (Baseplate) Connection ➁ Pin 2 Case/Pin Material Diallyl phthalate, UL94V-0 rated, aluminum baseplate; plated copper alloy pins Weight 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 (–VIN). ➅ Demonstrated MTBF available on request. Absolute Maximum Ratings Input Voltage: Continuous: D24 Models D48 Models Transient (100msec): D24 Models D48 Models 43 Volts 87 Volts 50 Volts 100 Volts On/Off Control +15 Volts Input Reverse-Polarity Protection Input Current must be limited. 1 minute duration. Fusing recommended. 6 Amps 3 Amps D24 Models D48 Models Output Overvoltage Protection ➁ 3.3V Outputs 2.5V Outputs 4.0 Volts, comparator 3.25 Volts, comparator Output Current ➁ Current limited. Devices can withstand an indefinite output short circuit. Storage Temperature –40 to +120°C Lead Temperature See Soldering Guidelines 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. www.murata-ps.com/support MDC_BCP Models.B06 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 +VIN and –VIN 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 variations 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 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. 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. VIN Range "D24" Models "D48" Models Fuse Value 6 Amps 3 Amps 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 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 VIN to VOUT 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 VOUT 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 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. +Vcc 3 +13V ON/OFF CONTROL +Vcc 3 ON/OFF CONTROL +3V 1 1 –INPUT –INPUT Figure 1A. No Suffix Figure 1B. "N" Suffix www.murata-ps.com/support MDC_BCP Models.B06 Page 5 of 7 Dual Output BCP Models 3.3 and 2.5V, Half-Brick 50 Watt DC/DC Converters 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 temperature 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. Threaded Inserts and Heatsink Installation CAUTION: Do not use the threaded inserts to bolt the converter down to a PC board. That will place unnecessary force on the mounting pins. Instead, the converter is held securely by only soldering the mounting pins. When attaching the heat sink from above the converter, use a maximum torque of 2 inch-pounds (0.23 N-m) on the M3 bolts to avoid damaging the threaded inserts. Use a tiny amount of fastener adhesive or M3 lockwashers to secure the bolts. 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" self-adhesive thermal pad and mounting screws. Note: When mounting the heat sink to the BCP converter: 1. Maximum applied torque is 2 in-lbs. 2. Minimum thread engagement of the mounting screws is 12mm deep. 6 ˚C WATT 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. Heat Sinks for BCP Series MPS 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, MPS 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 lowprofile heat sink measures 2.3" x 3.5", pcb real estate is unaffected. 5 4 THERMAL RESISTANCE 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." 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 Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: Maximum Preheat Temperature 115° C. Maximum Pot Temperature 270° C. Maximum Solder Dwell Time 7 seconds For Sn/Pb based solders: Maximum Preheat Temperature 105° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 6 seconds www.murata-ps.com/support MDC_BCP Models.B06 Page 6 of 7 Dual Output BCP Models 3.3 and 2.5V, Half-Brick 50 Watt DC/DC Converters Output Trimming Both the 3.3V and 2.5V outputs of the BCP Series can be independently trimmed via a trimpot (Figure 3A) or a single fixed resistor as shown (Figures 3B & 3C). The trimpot can be used to determine the value of a single fixed resistor. A single fixed resistor can increase or decrease the output voltage depending on its connection. Fixed resistors should have absolute TCR’s less than 100ppm/°C to ensure stability +2.5V OUTPUT 2.5V TRIM 1 +2.5V OUTPUT +3.3V OUTPUT +INPUT 3.3V TRIM 2.5V TRIM +3.3V OUTPUT 4 8 –INPUT 2.5V RETURN 3.3V RETURN 20kΩ 5-22 TURNS +2.5V TRIM UP +2.5V LOAD +3.3V TRIM UP +3.3V LOAD 7 5 6 +2.5V LOAD 9 Figure 3B. Increase Output Voltage Trim Connections Using a Fixed Resistor 7 +INPUT 3.3V TRIM 9 10 3.3V RETURN 1 8 –INPUT 2.5V RETURN 4 10 5 20kΩ 5-22 TURNS +3.3V LOAD 6 A single resistor connected from the Trim Pin (pin 5 for 3.3V trim, pin 8 for 2.5V trim) to its appropriate +Output (pin 7 for 3.3V trim, pin 10 for 2.5V trim) will decrease the output voltage. Figure 3A. Trim Connections Using a Trimpot A resistor connected from the Trim Pin (pin 5 for 3.3V trim, pin 8 for 2.5V trim) to the appropriate Return (pin 6 for 3.3V trim, pin 9 for 2.5V trim) will increase the output voltage. +2.5V OUTPUT 1 –INPUT 2.5V TRIM 2.5V RETURN +3.3V OUTPUT 4 10 8 9 +2.5V TRIM DOWN +2.5V LOAD +3.3V TRIM DOWN +3.3V LOAD 7 +INPUT 3.3V TRIM 3.3V RETURN 5 6 Figure 3C. Decrease Output Voltage Trim Connections Using a Fixed Resistor Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2012 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_BCP Models.B06 Page 7 of 7