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NQB-100NWA-DCNH-000-ESA Datasheet(PDF) 3 Page - CUI INC |
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NQB-100NWA-DCNH-000-ESA Datasheet(HTML) 3 Page - CUI INC |
3 / 30 page cui.com date 02/20/2013 │ page 3 of 30 CUI Inc │ SERIES: NQB-N │ DESCRIPTION: FULLY REGULATED ADVANCED BUS CONVERTERS General Information Reliability The failure rate (λ) and mean time between failures (MTBF= 1/ λ) is calculated at max output power and an operating ambient temperature (T A) of +40°C. CUI Power Modules uses Telcordia SR-332 Issue 2 Method 1 to calculate the mean steady-state failure rate and standard deviation (σ). Telcordia SR-332 Issue 2 also provides techniques to estimate the upper confidence levels of failure rates based on the mean and standard deviation. Mean steady-state failure rate, λ Std. deviation, σ h / s e r u li a F n 9 . 0 6 h / s e r u li a F n 1 2 4 MTBF (mean value) for the NQB series = 2.9 Mh. MTBF at 90% confidence level = 2.4 Mh Compatibility with RoHS requirements The products are compatible with the relevant clauses and requirements of the RoHS directive 2011/65/EU and have a maximum concentration value of 0.1% by weight in homogeneous materials for lead, mercury, hexavalent chromium, PBB and PBDE and of 0.01% by weight in homogeneous materials for cadmium. Exemptions in the RoHS directive utilized in CUI Power Modules products are found in the Statement of Compliance document. Safety Specification Reliability CUI Power Modules DC/DC converters and DC/DC regulators are designed in accordance with the safety standards IEC 60950 1, EN 60950 1 and UL 60950 1 Safety of Information Technology Equipment. IEC/EN/UL 60950 1 contains requirements to prevent injury or damage due to the following hazards: • Electrical shock • Energy hazards • Fire • Mechanical and heat hazards • Radiation hazards • Chemical hazards On-board DC/DC converters and DC/DC regulators are defined as component power supplies. As components they cannot fully comply with the provisions of any safety requirements without “conditions of acceptability”. Clearance between conductors and between conductive parts of the component power supply and conductors on the board in the final product must meet the applicable safety requirements. Certain conditions of acceptability apply for component power supplies with limited stand-off (see Mechanical Information for further information). It is the responsibility of the installer to ensure that the final product housing these components complies with the requirements of all applicable safety standards and regulations for the final product. Component power supplies for general use should comply with the requirements in IEC/EN/UL 60950 1 Safety of Information Technology Equipment. Product related standards, e.g. IEEE 802.3af Power over Ethernet, and ETS 300132 2 Power interface at the input to telecom equipment, operated by direct current (dc) are based on IEC/EN/UL 60950 1 with regards to safety. CUI Power Modules DC/DC converters and DC/DC regulators are UL 60950 1 recognized and certified in accordance with EN 60950 1. The flammability rating for all construction parts of the products meet requirements for V 0 class material according to IEC 60695 11 10, Fire hazard testing, test flames – 50 W horizontal and vertical flame test methods. Isolated DC/DC converters Galvanic isolation between input and output is verified in an electric strength test and the isolation voltage (V iso) meets the voltage strength requirement for basic insulation according to IEC/EN/UL 60950-1. It is recommended to use a slow blow fuse at the input of each DC/DC converter. If an input filter is used in the circuit the fuse should be placed in front of the input filter. In the rare event of a component problem that imposes a short circuit on the input source, this fuse will provide the following functions: • Isolate the fault from the input power source so as not to affect the operation of other parts of the system • Protect the distribution wiring from excessive current and power loss thus preventing hazardous overheating The DC/DC converter output is considered as safety extra low voltage (SELV) if one of the following conditions is met: • The input source has double or reinforced insulation from the AC mains according to IEC/EN/ UL 60950-1 • The input source has basic or supplementary insulation from the AC mains and the input of the DC/DC converter is maximum 60 Vdc and connected to protective earth according to IEC/EN/UL 60950-1 • The input source has basic or supplementary insulation from the AC mains and the DC/DC converter output is connected to protective earth according to IEC/EN/UL 60950-1 Non - isolated DC/DC regulators The DC/DC regulator output is SELV if the input source meets the requirements for SELV circuits according to IEC/ EN/UL 60950-1. |
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