76250ENC MURATA-PS | Alldatasheet
Document overview
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Technical content
KMP_7625XENC_D01 Page 1 of 5 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers www.murata-ps.com For full details go to www.murata-ps.com/rohs www.murata.com
FEATURES
RoHS compliant Maxim MAX250/MAX251/MAX253 compatible EN62368-1 TUV certificate of compliance Isolation to 6kVDC Toroidal construction Industry-standard pinout UL 94 V-0 package materials Fully encapsulated Compatible with RoHS soldering systems Backward compatible with Sn/Pb soldering systems
DESCRIPTION
The 76250ENC converter transformer is specifically designed for use with Maxim chipsets to provide isolated RS232 interfaces. A carefully controlled turns ratio ensures consistent performance whilst a toroidal construction minimises EMI. The 76253/XXENC converter transformers are specifically designed for use with the MAX253 chip set to provide isolated power supplies. The 5V version can supply 1W and the 3.3V version can supply 500mW. A centre tapped secondary winding allows for full bridge, half bridge or voltage doubling. SELECTION GUIDE Order Code Input Voltage Output Voltage Max. Output Current Isolation Voltage Turns RatioV V mA V DC 76250ENC - - - 6000 1CT:1 76253/35ENC 3.3 5.0 100 6000 1:√5 76253/55ENC 5.0 5.0 200 6000 1:1.33 76250ENC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP (1&5) 10kHz, 100mV 1.0 2.0 2.5 mH Leakage Inductance, LL (1&5)2 100kHz, 100mV 35 40 μH Interwinding Capacitance, CWW (1&2) 100kHz, 100mV 1.5 3.0 pF Volt-time Product, ET (1&5) 50 Vμs 76253/35ENC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP (1&5) 100kHz, 250mV 140 200 μH Secondary Inductance, LS (2&6) 100kHz, 250mV 700 1000 μH Leakage Inductance, LL (1&5)2 100kHz, 250mV 5.0 7.0 μH Interwinding Capacitance, CWW (1&2) 100kHz, 250mV 2.7 3.5 pF Volt-time Product, ET (1&5) 25 35 Vμs 76253/55ENC CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Primary Inductance, LP (1&5) 100kHz, 250mV 80 150 μH Secondary Inductance, LS (2&6) 100kHz, 250mV 142 267 μH Leakage Inductance, LL (1&5)2 100kHz, 250mV 7.0 10.0 μH Interwinding Capacitance, CWW (1&2) 100kHz, 250mV 2.7 3.5 pF Volt-time Product, ET (1&5) 30 40 Vμs ABSOLUTE MAXIMUM RATINGS Operating free air temperature range 76250EN 0°C to 70°C Operating free air temperature range 76253/XXEN -40°C to 85°C Storage temperature range -50°C to 125°C Lead temperature 1.5mm from case for 10 seconds 300°C Peak current, IPK 76250EN 300mA Peak current, IPK 76253/XXEN 400mA Isolation voltage (flash tested for 1 second) 6000VDC SOLDERING INFORMATION3 Peak wave solder temperature 300˚C for 10 seconds Pin finish Matte tin All specifications typical at TA=25°C 1 Refer to mechanical dimensions for pin locations shown in brackets. 2 With pins 2 & 6 short circuited. 3 For further information, please visit www.murata-ps.com/rohs
KMP_7625XENC_D01 Page 2 of 5 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers www.murata.com TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. All products in this series are 100% production tested at their stated isolation voltage. This series is certified by TUV to EN62368-1 with a working voltage of 300Vrms for Reinforced Insulation systems. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from the specified test voltage. SAFETY APPROVAL EN62368-1 The7625xEN series has been certified by TUV to EN62368-1 for reinforced insulation to a working voltage of 300Vrms, 2500Vpk and a working frequency of 30kHz. Operation above 30kHz would need evaluation during system level evaluation. Working altitude OVC II 5000m. Creepage and clearance is 9.3mm.
KMP_7625XENC_D01 Page 3 of 5 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers www.murata.com TYPICAL CHARACTERISTICS (VOLTAGE CURVES) VOLTAGE CURVES Output Voltage (V) Output Voltage (V) Output Current (mA) Output Current (mA) EFFICIENCY CURVES Efficiency (%) Efficiency (%) Output Current (mA) Output Current (mA) VOLTAGE DEVIATION Voltage deviation from nominal 25ºC output (%) Voltage deviation from nominal 25ºC output (%) Temperature (ºC) Temperature (ºC) All curves are derived from testing with the Maxim MAX235 IC using the circuit shown in application note MPAN-03 (download at http://www.murata-ps.com/data/apnotes/mpan-03.pdf). 0 20 40 60 80 100 0 100 200 300 400 76253/35ENC 76253/55ENC 0 20 40 60 80 100 100 0 100 200 300 400 100 76253/35ENC 76253/55ENC -50 -25 0 25 50 75 100 110 105 100 -50 -25 0 25 50 75 100 76253/35ENC 76253/55ENC 110 105 100
KMP_7625XENC_D01 Page 4 of 5 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers www.murata.com PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS TUBE DIMENSIONS RECOMMENDED FOOTPRINT DETAILS * 76250EN Pin not fitted. Unless otherwise stated all dimensions in mm (inches) ±0.25mm (±0.01). Tube length: 480±2.00mm (18.90±0.079"). Tube quantity: 30 Tube material: Antistatic coated clear pvc. Holes may be omitted for variants with fewer than 6 pins. Unless otherwise stated all dimensions in mm (inches) ±0.25 (0.01). 2.54 (0.100) 2.54 (0.100) x6 HOLES* Primary 4.10 (0.161) 12.50 (0.492) 12.00 (0.472) 2.54 (0.1) 7.50 (0.295) 15.00 (0.59) 15.00 (0.59) 76250ENC XYYWW Ø0.56±0.05 (Ø0.022±0.002) Primary Secondary Secondary 1 Pin Connections 76250EN (Top View) Pin Connections 76253/XXEN (Top View)
KMP_7625XENC_D01 Page 5 of 5 76250ENC, 76253/XXENC EN Approved MAX250/251/253 Compatible Converter Transformers www.murata.com Murata Power Solutions (Milton Keynes) Ltd. 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. © 2021 Murata Power Solutions (Milton Keynes) Ltd This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: https://www.murata.com/en-eu/products/power/requirements DISCLAIMER Unless otherwise stated in the datasheet, all products are designed for standard commercial and industrial applications and NOT for safety-critical and/or life-critical applications. Particularly for safety-critical and/or life-critical applications, i.e. applications that may directly endanger or cause the loss of life, inflict bodily harm and/or loss or severe damage to equipment/property, and severely harm the environment, a prior explicit written approval from Murata is strictly required. Any use of Murata standard prod- ucts for any safety-critical, life-critical or any related applications without any prior explicit written approval from Murata shall be deemed unauthorised use. These applications include but are not limited to:
- Aircraft equipment
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