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NQ16W50VMA16ORN-G Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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NQ16W50VMA16ORN-G Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 13 page  Product # NQ16W50xMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NV12WE Rev. B 11/26/07 Page 11 Input: Input: Outputs: Outputs: Current: Current: PPackage: ackage: 6.0 - 16.0V 6.0 - 16.0V 0.75 - 5.0V 0.75 - 5.0V 16A 16A SIP SIP T Technical S echnical Specification pecification The shutdown point is fixed on standard option. These convert- ers also offer adjustable OVP set point. For more detailed infor- mation contact SynQor technical support. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Over- Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value. APPLICATION CONSIDERATIONS Input and Output Filtering: SynQor recommends an external input capacitor of either a tantalum, polymer or aluminum elec- trolytic type on the input of the NQ16 series non-isolated con- verters. This capacitance and resistance primarily provides damping of the input filter, reduces the source impedance and guarantees input stability (see SynQor application note "Input System Instability"). The input filter is formed by any source or wiring inductance and the converter’s input capacitance. The external capacitance also provides an additional benefit of rip- ple voltage reduction. A modest sized capacitor would suffice in most conditions, such as a 330µF, 16V tantalum, with an ESR of approximately 50 mW. The NiQor family converters have an internal ceramic input capacitor to reduce ripple current stress on the external capaci- tors. An external ceramic capacitor of similar size (330µF) with a series resistor of approximately 50 mW would also suffice and would provide the filter damping. Additional ceramic capacitance may be needed on the input, in parallel with the tantalum capacitor, to relieve ripple current stress on the tantalum capacitors. The external capacitance forms a current divider with the 40µF internal ceramic capacitance. At 300 kHz., the impedance of the internal capacitance is about 15mW capacitive. At that frequency, an SMT 330µF tantalum capacitor would have an impedance of about 50mW resistive, essentially just the ESR. In this example, at full load, that would stress the tantalum input capacitor to about 3A rms ripple current, possibly beyond its rat- ing. Placing an additional 40µF of ceramic in parallel with that capacitor would reduce the ripple current to about 1.5A, proba- bly within its rating at 85oC. The input ripple current is propor- tional to load current, so this example should be scaled down according to the actual load current. Additional input capacitance equal to half of the output capaci- tance is recommended when operating with more than 1000uF of output capacitance on lower voltage outputs when trimming down by more than half of the trim-down allowance (e.g., further than -2.5% on a 0.9V, or -5% on a 1.2V). Input inductance should be reduced for maintaining input stabili- ty when operating with large output capacitance (>1000µF). Reducing input inductance to <0.3µH provides for good phase margin with up to the 4000µF maximum output capacitance. If the input inductance must be increased up to 1µH even with large output capacitance (>1000µF), an input capacitance equal to or greater than the output capacitance may be needed to compen- sate the input impedance. If no inductor is used to isolate the input ripple of the NiQor con- verters from the source or from inputs of other NiQor converters, then this external capacitance might be provided by the DC/DC converter used as the power source. SynQor's PowerQor series converters typically have tantalum and ceramic output capacitors that would provide the damping. An input inductor would help isolate the ripple currents and volt- ages from the source or other NiQor style converters on the volt- age supply rail. If an input inductor is used, the recommended capacitance should guarantee stability and control the ripple cur- rent for up to 1.0µH of input inductance. The input inductor need not have very high inductance. A value of 250 nanohenries would equate to almost 500 miliohm of series impedance at the switching frequency of 300 kHz. This would be working against an assumed capacitive ESR of 30mW on the supply side of the inductor, providing significant isolation and ripple reduction. No external capacitance is required at the output, however, the ripple voltage can be further reduced if ceramic and tantalum capacitors are added at the output. Since the internal output capacitance is about 50µF, approximately that amount of ceram- ic capacitance would be needed to produce a noticeable reduc- tion in output ripple. The value of the tantalum capacitors is both to provide a high capacitance for pulsed loads and to provide damping of the distribution network with their inherent ESR, which is low, but higher than ceramics. Additional output capac- itance in the range of 300-500µF is beneficial for reducing the deviation in response to a fast load transient. Input Over-Voltage Prevention: The power system design- er must take precautions to prevent damaging the NiQor con- verters by input overvoltage. This is another reason to be careful about damping the input filter so that no ringing occurs from an underdamped filter. The voltage must be prevented from exceed- ing the absolute maximum voltage indicated in the Electrical |
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