EMH-54/3-Q48N-C Series www.murata-ps.com Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters ORDERING GUIDE SUMMARY Model Vout Range Iout Range Vin Range Ripple/Noise Efficiency 54V 0.2-3A 18-72V 250mVp-p 91.5% EMH-54/3-Q48 INPUT CHARACTERISTICS Parameter Typical units Typ. @ 25°C, full load Notes Voltage Range 18-72 Volts 48V nominal Input Current, full power 3.67 Amps VIN = 48V Turn On/start-up threshold 17.5 Volts Undervoltage Shutdown 17 Volts No load Input Current 40mA VIN = 48V OUTPUT CHARACTERISTICS Parameter Typ. @ 25°C, full load Notes Voltage 54 Volts ±2% Current 0.2 to 3 Amps 0.2A min load required Power Output 162 Watts Ripple & Noise 250mVp-p Line and Load Regulation ±0.125%/±0.2% Overcurrent Protection 4 Amps Overtemperature Protection +135°C FEATURES Efficiency (minimum) 89.5% Industry-Standard “Half-Brick” footprint Efficiency (typical) 91.5% 162W output power @ 24-72Vin Parameter On/Off Control (Negative logic) Dynamic Load Response Monotonic startup into pre-bias output conditions Over-current, Output & Over-temperature protection Low output ripple and noise Operational Temperature Range –40°C to +85°C with baseplate 2250V I/O isolation Output short-circuit protection (hiccup technique) With hiccup auto-restart GENERAL SPECIFICATIONS Up to 91.5% Efficiency at 54V output (typical) Strong thermal derating characteristics 20MHz bandwidth Typ. @ 25°C, full load Notes 300μsec 50-75-50% step to ±1 of final value Operating Temperature Range –40 to +85°C With baseplate, see derating curve Absolute Operating Temperature Range –40 to +105°C Measured at Thermistor, see derating UL 60950-1, 2nd edition Safety Features CSA-C22.2 No.60950-1 and IEC/EN60950-1 PHYSICAL SPECIFICATIONS Parameter Inches Millimeters Open frame (no baseplate) 2.4 x 2.3 x 0.43 61 x 58.4 x 10.92 With baseplate 2.4 X 2.3 X 0.5 61.0 x 58.4 x 12.7 PRODUCT OVERVIEW The EMH-54/3-Q48N-C module offers 54V output at 3 amps in a Half Brick footprint DC/DC power converter. These compact modules measure 2.4˝ x 2.3˝ x 0.5˝ (61 x 58.4 x 12.7 mm) with baseplate and offer the industry-standard Half-Brick footprint. The product is designed to fully comply with RoHS-6 directive. The modules offer wide range input voltage of 18-72V. The EMH topology offers high efficiency up to 91.5%, good regulation, low ripple/noise, and a fast dynamic load response. The module supplies up to 162 Watts of power and isolation rated at 2250V for basic insulation. EMH models are designed for demanding telecom, POE (power over Ethernet), datacom, and networking applications. EMHs feature input filters, input under voltage, output current limiting, short-circuit protection, and thermal shutdown. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 1 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Root Model ➀ EMH-54/3-Q48 Input VOUT (Volts) IOUT (Amps, Max.) (Watts) Typ. Max. Line Load VIN Nom. (Volts) 54 3 162 250 350 ±0.125% ±0.2% 48 Power R/N (mV pk-pk) Regulation (Max.) ➀Please refer to the full part number structure for additional ordering part numbers and options. ➁ All specifications are typical at nominal line voltage and full load, +25ºC. unless otherwise noted. Range (Volts) IIN, no load (mA) IIN, full load (Amps) 18-72 40 3.67 Efficiency Min. Typ. 89.5% 91.5% Dimensions with baseplate (Inches) 2.4x2.3x0.5 ➂ Full power continuous output requires baseplate installation. Please refer to the derating curves. Units are tested with a 1uF ceramic external output capacitor and a 100uf and 2.2uF external input capacitor. PART NUMBER STRUCTURE EMH - 54 / 3 - Q48 N B - Lx C Ethernet-Module Half Brick Series RoHS Hazardous Materials compliance C = RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder Nominal Output Voltage Maximum Output Current in Amps Input Voltage Range: Q48 = 18-72 Volts (48V nominal) Pin length option Blank = standard pin length 0.180 in. (4.6 mm) L1 = 0.110 in. (2.79 mm)* L2 = 0.145 in. (3.68 mm)* Baseplate Blank = No baseplate, standard B = Baseplate installed On/Off Control Logic N = Negative logic, standard Note: Some model combinations may not be available. Contact Murata Power Solutions for availability. Customer Configured Part Numbers: 1. EMH-31310-C (special version of the EMH-54/3-Q48NB-C) a. Includes conformal coating b. Isolation tested to 2,828Vdc Input-to-Output per IEEE 1613 c. Pin length of 0.180 inches ±0.02 (4.6mm ±0.508) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 2 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters FUNCTIONAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Isolation Voltage Input Reverse Polarity On/Off Remote Control Output Power Conditions ➀ Minimum Full power operation Input to output tested None, install external fuse Power on or off, referred to -Vin 0 Typical/Nominal Maximum Units 72 2250 Vdc Vdc Vdc Vdc W None 0 0 15 164.32 Current-limited, no damage, 0.2 3 A short-circuit protected Storage Temperature Range Vin = Zero (no power) -55 125 °C Absolute maximums 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 nor recommended. Output Current INPUT Operating voltage range ➁ Turn On/Start-up threshold Ambient temperature > 60°C Turn Off/Undervoltage lockout Turn-On/Turn-Off Hysteresis Reverse Polarity Protection Recommended External Fuse Internal Filter Type Input current Full Load Conditions Low line input current Inrush Transient Short Circuit Input Current No Load Input Current Shutdown Mode Input Current (Off, UV, OT) Reflected (back) ripple current ➂ Rising input voltage Tested at 2.6A 18 16.5 48 17.5 15 1.0 17 1.05 None 20 L-C None, install external fuse Fast blow Vin = nominal Vin @ Min. @2.6A 3.67 8.52 0.1 250 40 5 40 Iout = minimum, unit=ON Measured at input with specified filter 72 18 19 17.5 1.2 Vdc Vdc Vdc Vdc Vdc Vdc A 3.83 8.84 A A A2-Sec. mA mA mA mA, p-p 350 80 10 80 GENERAL and SAFETY Efficiency Isolation Isolation Voltage: no baseplate Isolation Voltage: with baseplate Insulation Safety Rating Isolation Resistance Isolation Capacitance Safety (Designed to meet the following requirements) Calculated MTBF Vin = 48V, full load Vin = 24V, full load Vin = 18V, full load 89.5 89.5 89.5 Input to output, continuous Input to output, continuous Input to Baseplate, continuous Output to Baseplate, continuous 2250 2250 1500 750 91.5 91.5 91 % % % Vdc Vdc basic 100 5,000 UL-60950-1, CSA-C22.2 No.60950-1, IEC/EN60950-1, 2nd Edition Per Telcordia SR332, issue 1 class 3, ground fixed, Tambient=+25°C Mohm pF Yes Hours x 106 1.8+ DYNAMIC CHARACTERISTICS Fixed Switching Frequency Startup Time Startup Time Dynamic Load Response Dynamic Load Peak Deviation 387 Power On to Vout regulated 10-90% (50% resistive load) Remote ON to 10% Vout (50% resistive load) 50-75-50% load step, settling time to within ±2% of Vout same as above 430 473 KHz 40 60 mS 30 50 mS 300 450 μSec ±1000 ±1250 mV 1 0.8 15 2 V V mA FEATURES and OPTIONS Remote On/Off Control ➃ “N” suffix: Negative Logic, ON state Negative Logic, OFF state Control Current Base Plate ON = Pin grounded or external voltage OFF = Pin open or external voltage open collector/drain “B” suffix -0.7 5 www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 3 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters FUNCTIONAL SPECIFICATIONS (CONT.) OUTPUT Total Output Power Voltage Nominal Output Voltage Setting Accuracy Output Voltage Range Overvoltage Protection Current Output Current Range: 24-72 Vin Output Current Range: 18-24 Vin Minimum Load Current Limit Inception ➄ Short Circuit Short Circuit Current Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation ➅ Line Regulation Load Regulation Ripple and Noise Temperature Coefficient Maximum Capacitive Loading See Derating 0.0 161.1 164.32 W No trim At 50% load User-adjustable ➅ Via magnetic feedback 52.626 -2 53.7 54.774 2 67 Vdc % of Vnom. % of Vnom. Vdc 3 2.6 0.2 3.9 3 2.6 A A 4.7 A Hiccup technique, autorecovery within ±1% of Vout, non-latching 0.5 1 A Output shorted to ground, no damage Continuous ±0.125 ±0.2 350 % % mV pk-pk % of Vnom./°C μF N/A 65 0.2 0.2 98% of Vnom., after warmup 3.2 Current limiting Vin=min. to max. Vout=nom., 50% load Iout=min. to max. Vin=48V. 5 Hz- 20 MHz BW At all outputs Low ESR, resistive load 250 0.02 0 3300 MECHANICAL (Through Hole Models) Outline Dimensions (open frame) 2.4 x 2.3 x 0.43 61.0 x 58.4 x 10.92 2.4 X 2.3 X 0.5 61.0 x 58.4 x 12.7 2.3 67.13 0.04 & 0.080 1.016 & 2.032 Copper alloy 50 5 Aluminum Outline Dimensions (with baseplate) LxWxH (Please refer to outline drawing) Weight (with baseplate) Through Hole Pin Diameter See mechanical drawing Through Hole Pin Material TH Pin Plating Metal and Thickness Nickel subplate Gold overplate Case or Baseplate Material Inches mm Inches mm Ounces Grams Inches mm μ-inches μ-inches ENVIRONMENTAL Operating Ambient Temperature Range Operating Ambient Temperature Range with Baseplate Absolute Operating Temperature Range Storage Temperature Thermal Protection/Shutdown Electromagnetic Interference Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 RoHS rating With derating Maximum baseplate temperature: Converter delivers full rated power at max baseplate temp. Measured @ Thermistor or in the middle of baseplate Vin = Zero (no power) Notes External filter required ➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage and full load. General conditions are +25° Celsius ambient temperature, near sea level altitude, natural convection airflow. All models are tested and specified with an external 1 μF multi-layer ceramic output capacitor. The external input capacitors are 100uF and 2.2uF ceramic. All capacitors are low-ESR types wired close to the converter. These capacitors are necessary for our test equipment and may not be needed in the user’s application. ➁ The module will operate when input voltage is within the 18-72V Operating Voltage Range. Output regulation at full load will be achieved only when Vin ≥ 18V. -40 85 °C -40 100 °C -40 -40 125 105 125 140 °C °C 135 B Class B RoHS-6 Class ➂ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is Cbus = 220 μF, Cin = 33 μF and Lbus = 12 μF. ➃ The Remote On/Off Control is referred to -Vin. ➄ Over-current protection is non-latching with auto reovery (Hiccup) ➅ Regulation specifications describe the output voltage changes as the line voltage or load current is varied from its nominal or midpoint value to either extreme. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 4 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Maximum Current Temperature Derating vs. Airflow (Vin = 24V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate) 4 4 3 3 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating vs. Airflow (Vin = 18, airflow from Pin 1 to Pin 4 on PCB, no Baseplate) 2 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 2 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 0 0 30 35 40 45 50 55 60 65 70 75 80 30 85 35 40 45 4 4 3 3 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 60 65 70 75 80 85 80 85 80 85 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 Ambient Temperature (°C) 55 60 65 70 75 Maximum Current Temperature Derating vs. Airflow (Vin = 72V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate) 4 3 3 Output Current (Amps) 4 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 50 Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow (Vin = 60, airflow from Pin 1 to Pin 4 on PCB, no Baseplate) Output Current (Amps) 55 Maximum Current Temperature Derating vs. Airflow (Vin = 48V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate) Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating vs. Airflow (Vin = 36, airflow from Pin 1 to Pin 4 on PCB, no Baseplate) 2 50 Ambient Temperature (°C) Ambient Temperature (°C) 1 2 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 0 0 30 35 40 45 50 55 60 65 Ambient Temperature (°C) 70 75 80 85 30 35 40 45 50 55 60 65 70 75 Ambient Temperature (°C) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 5 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Maximum Current Temperature Derating vs. Airflow (Vin = 24V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate) 4 4 3 3 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating vs. Airflow (Vin = 18, airflow from Pin 1 to Pin 4 on PCB, with Baseplate) 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 1 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 Ambient Temperature (°C) 4 4 3 3 Output Current (Amps) Output Current (Amps) 60 65 70 75 80 85 Maximum Current Temperature Derating vs. Airflow (Vin = 48V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate) 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 Ambient Temperature (°C) 55 60 65 70 75 80 85 Maximum Current Temperature Derating vs. Airflow (Vin = 72V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate) 4 3 3 Output Current (Amps) 4 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 50 Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow (Vin = 60, airflow from Pin 1 to Pin 4 on PCB, with Baseplate) Output Current (Amps) 55 Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow (Vin = 36, airflow from Pin 1 to Pin 4 on PCB, with Baseplate) 2 50 1 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2 1 0 0 30 35 40 45 50 55 60 65 Ambient Temperature (°C) 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 6 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Efficiency (%) Efficiency vs Line Voltage and Load Current @ +25°C 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 Startup Delay (Vin=48V, Iout=3A, Ta=+25°C) Trace 1=Vin, Trace 4=Vout. Vin = 18V Vin = 24V Vin = 36V Vin = 48V Vin = 60V Vin = 75V 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 Load Current (Amps) On/Off Enable Delay (Vin=48V, Iout=3A, Ta=+25°C) Trace 1=Enable, Trace 4=Vout. Stepload Transient Response (Vin=48V, Iout =50-75-50%, Ta=+25°C) Output Ripple and Noise (Vin=48V, Vout=nom, Iout=0A, Cload=1uF, Ta=+25°C) Output Ripple and Noise (Vin=48V, Vout=nom, Iout=3A, Cload=1uF, Ta=+25°C) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 7 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Thermal image with hot spot at 2.9A with 25°C ambient temperature. Natural convention is used with no forced airflow. Identifiable and recommended maximum value to be verified in application. Vin=48V, T3 and Q12 max temp=128°C/IPC9592 guidelines. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 8 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters MECHANICAL SPECIFICATIONS – OPEN FRAME 1.900 [48.26] MOUNTING PLANE (PIN SHOULDERS) 1 0.700 [17.78] CL 0.300 [7.62] 2.40 [60.96] 9 0.700 [17.78] 1.400 [35.56] 3 4 3x .040 PINS 1, 3 & 4 2.300 [58.42] SIDE VIEW TOP VIEW 5 2x .080 PINS 5 & 9 0.95 [24.1] CL BOTTOM VIEW 0.43 [10.92] END VIEW Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ Components are shown for reference only. INPUT/OUTPUT CONNECTIONS Pin Function 1 Negative Input 2 Omitted 3 Remote On/Off 4 Positive Input 5 Positive Output 6 Omitted 7 Omitted 8 Omitted 9 Negative Output MATERIAL: FINISH: (ALL PINS) .080 PINS: COPPER ALLOY .040 PINS: COPPER ALLOY FINISH: (ALL PINS) GOLD (5u”MIN) OVER NICKEL (50u” MIN) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 9 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters MECHANICAL SPECIFICATIONS – WITH BASEPLATE [58.4] 2.30 Dimensions are in inches (mm shown for ref. only). Third Angle Projection [61.0] 2.40 2.000 [50.8] TOP VIEW Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ 0.112-40-UNC-2B 0.25 MIN DEEP (4 PLS) Components are shown for reference only. 1.900 [48.26] ALUMINUM BASEPLATE END VIEW 0.015 [.381] MIN CLEARANCE [12.7±0.38] 0.5±.015 MTG PLANE SIDE VIEW 0.071 .002 VENTED SHOULDER AT EACH 0.040±.002 (PINS 1, 3-4) 0.080±.002 (PINS 5 & 9) 1.900 [48.26] INPUT/OUTPUT CONNECTIONS Pin Function 1 Negative Input 2 Omitted 3 Remote On/Off 4 Positive Input 5 Positive Output 6 Omitted 7 Omitted 8 Omitted 9 Negative Output PIN 9 PIN 1 1.400 PIN 3 0.300 [7.62] 0.700 PIN 4 CL [35.56] [17.78] PIN 5 [24.1] 0.95 CL BOTTOM VIEW PIN 1 MATERIAL: .040 PINS: COPPER ALLOY .080 PINS: COPPER ALLOY FINISH: (ALL PINS) GOLD (5u"MIN) OVER NICKEL (50u" MIN) ISOMETRIC VIEW www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 10 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters RECOMMENDED FOOTPRINT TOP VIEW [2.32] 0.091 FINISHED HOLE SIZES @ PINS 1, 3 AND 4 (PER IPC-D-275, LEVEL C) 0.048-.062 (PRI) (SEC) 5 4 [2.42] 0.095 0.150MIN @5 & 9 FOR PIN SHOULDERS [0.700] 0.027 3 [7.62] 0.300 CL CL 0.100 MIN @ 1, 3, AND 4 FOR PIN SHOULDERS 1 9 FINISHED HOLE SIZES @ PINS 5 & 9 [0.950] 0.037 (PER IPC-D-275, LEVEL C) CL .088-.102 [48.26] 1.900 STANDARD PACKAGING Each static dissipative polyethylene foam tray accommodates 9 converters in a 3 x 3 array Carton inside dimensions: 10" x 10" x 4.25" (4 trays of 9) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 11 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. For greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. The installer must observe all relevant safety standards and regulations. For safety agency approvals, install the converter in compliance with the end-user safety standard, i.e. IEC/EN/UL 60950-1. Input Reverse-Polarity Protection If the input voltage polarity is reversed, an internal diode will become forward biased and likely draw excessive current from the power source. If this source is not current-limited or the circuit appropriately fused, it could cause permanent damage to the converter. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. Users should be aware however of input sources near the Under-Voltage Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. Start-Up Time Assuming that the output current is set at the rated maximum, the Vin to Vout Start-Up Time (see Specifications) is the time interval between the point when the ramping input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. These converters include a soft start circuit, which limits the duty cycle of the PWM controller at power up, thereby limiting the input inrush current. The On/Off Remote Control interval from On command to Vout regulated assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified accuracy band. The specification assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to Vout regulated specification such as external load capacitance and soft start circuitry. Input Source Impedance These converters will operate to specifications without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance, performance is improved by adding external filter components. Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to totally characterize all applications, some experimentation may be needed. Note that external input capacitors must accept high speed switching currents. Because of the switching nature of DC/DC converters, the input of these converters must be driven from a source with both low AC impedance and adequate DC input regulation. Performance will degrade with increasing input inductance. Excessive input inductance may inhibit operation. The DC input regulation specifies that the input voltage, once operating, must never degrade below the Shut-Down Threshold under all load conditions. Be sure to use adequate trace sizes and mount components close to the converter. I/O Filtering, Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (Cin in the figure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient IR drops in the input conductors. Users should select input capacitors for bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current ratings. In the figure below, the Cbus and Lbus components simulate a typical DC voltage bus. Your specific system configuration may require additional considerations. Please note that the values of Cin, Lbus and Cbus will vary according to the specific converter model. TO OSCILLOSCOPE CURRENT PROBE +INPUT VIN + – + – LBUS CBUS CIN -INPUT CIN = 33μF, ESR < 700mΩ @ 100kHz CBUS = 220μF, ESR < 100mΩ @ 100kHz LBUS = 12μH Figure 1. Measuring Input Ripple Current In critical applications, output ripple and noise (also referred to as periodic and random deviations or PARD) may be reduced by adding filter elements such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR. Our Application Engineers can recommend potential solutions. Floating Outputs Since these are isolated DC/DC converters, their outputs are “floating” with respect to their input. The essential feature of such isolation is ideal ZERO CURRENT FLOW between input and output. Real-world converters however do exhibit tiny leakage currents between input and output (see Specifications). These leakages consist of both an AC stray capacitance coupling component and a DC leakage resistance. When using the isolation feature, do not allow the isolation voltage to exceed specifications. Otherwise the converter may be damaged. Designers will normally use the negative output (-Output) as the ground return of the load circuit. You can however use the positive output (+Output) as the ground return to effectively reverse the output polarity. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 12 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters +OUTPUT 5 C1 -OUTPUT SCOPE RLOAD 9 C1 = 1μF CERAMIC LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 2. Measuring Output Ripple and Noise (PARD) Thermal Shutdown To prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/DC’s to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent rapid on/off cycling. The temperature sensor is typically located adjacent to the switching controller, approximately in the center of the unit. See the Performance and Functional Specifications. CAUTION: If you operate too close to the thermal limits, the converter may shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in this data sheet illustrate typical operation under a variety of conditions. The derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in temperature and/or current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that very low flow rates are similar to “natural convection,” that is, not using fan-forced airflow. Murata Power Solutions makes characterization measurements in a closed loop wind tunnel with measured airflow. We use both thermocouples and an infrared camera system to observe thermal performance. If in doubt, contact Murata Power Solutions to discuss placement and measurement techniques of suggested temperature sensors. CAUTION: If you routinely or accidentally exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected at slightly above Sea Level altitude. Be sure to reduce the derating for higher density altitude. Output Overvoltage Protection This converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. If the output exceeds OVP limits, the sensing circuit will power down the unit, and the output voltage will decrease. After a time-out period, the PWM will automatically attempt to restart, causing the output voltage to ramp up to its rated value. It is not necessary to power down and reset the converter for this automatic OVP-recovery restart. If the fault condition persists and the output voltage climbs to excessive levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred to as “hiccup” mode. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. Consider using an appropriate fuse in series with the output. Output Current Limiting As soon as the output current increases to its maximum rated value, the DC/DC converter will enter a power-limiting mode. The output voltage will decrease proportionally with increases in output current, thereby maintaining a somewhat constant power output. This is commonly referred to as power limiting. Current limiting inception is defined as the point at which full power falls below the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value. This enhances reliability and continued operation of your application. If the output current is too high, the converter will enter the short circuit condition. Output Short Circuit Condition When a converter is in power-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart, causing the output voltage to begin ramping up to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures. A short circuit can be tolerated indefinitely. Remote On/Off Control Negative: Optional negative-logic devices are on (enabled) when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –Vin. The device is off (disabled) when the On/Off is pulled high to +Vin with respect to –Vin. Dynamic control of the On/Off function should be able to sink appropriate signal current when brought low and withstand appropriate voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. There are two CAUTIONs for the On/Off Control: CAUTION: While it is possible to control the On/Off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open collector transistor or a relay (which can thereupon be controlled by logic). CAUTION: Do not apply voltages to the On/Off pin when there is no input voltage. Otherwise the converter may be permanently damaged. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 13 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters Soldering Guidelines +VIN +VCC ON/OFF CONTROL 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: –VIN For Sn/Pb based solders: Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C. Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds Figure 3. Driving the Negative Logic On/Off Control Pin Power Over Ethernet (PoE) Power over Ethernet (PoE) supports the implementation of the IEEE 802.3af and IEEE 802.3at standards; this implementation allows both data and electrical power to pass over a copper Ethernet LAN cable. PoE permits electric power, along with data, to be passed over a copper Ethernet LAN cable. Powered devices, such as voice-over-IP telephones, wireless access points, video cameras, and point-of-sale devices, that support PoE can receive power safely from the access ports that are used to connect personal computers to the network. IEEE 802.3at increases the amount of power to 30W. The PoE standard provides support for legacy PoE devices. An IEEE 802.af powered device can operate normally when connected to IEEE 802.at power sourcing equipment. Standard IEEE 802.3af (PoE) and IEEE 802.3at (PoE +) IEEE 802.3at (PoE+) Class Maximum Power delivered by PoE port Power range of powered device 0 1 2 3 4 15.4 W 4W 7.0 W 15.4 W 30.0 W 0.44 through 12.95 W 0.44 through 3.84 W 3.84 through 6.49 W 6.49 through 12.95 W 12.95 through 25.5 W Table 1. Class of Powered Device and Power Levels www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 14 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters IR Transparent optical window Unit under test (UUT) IR Video Camera Precision low-rate anemometer 3” below UUT Ambient temperature sensor Airflow collimator Vertical Wind Tunnel Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airflow and heat dissipation analysis of power products. The system includes a precision low flow-rate anemometer, variable speed fan, power supply input and load controls, Variable temperature gauges, and adjustable heating element. speed fan The IR camera monitors the thermal performance of the Unit Under Test (UUT) under static steady-state conditions. A special optical port is used which is transparent to infrared wavelengths. Both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse airflow studies are possible by rotation of this carrier board Heating since there are often significant differences in the heat element dissipation in the two airflow directions. The combination of adjustable airflow, adjustable ambient heat, and adjustable Input/Output currents and voltages mean that a very wide range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent to the UUT by minimizing airflow turbulence. Such turbulence influences the effective heat transfer characteristics and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly causing uneven overheating. Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating element and fan, built-in temperature gauges, and no-contact IR camera mean that power supplies are tested in real-world conditions. Figure 4. Vertical Wind Tunnel 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. © 2016 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A05 Page 15 of 15