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NQ04W33SMA16 Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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NQ04W33SMA16 Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Input: Input: Outputs: Outputs: Current: Current: PPackage: ackage: 2.4 - 6.0V 2.4 - 6.0V 0.75 - 3.6V 0.75 - 3.6V 16A 16A SMT SMT T Technical S echnical Specification pecification Product # NQ04W33SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NV4S3E Rev. B 11/26/07 Page 10 The shutdown point is fixed on standard option. SMA also offers adjustable OVP set point. For more detailed information 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 Filtering/Capacitance/Damping: The filter circuit of Figure E is often added to the converter's input to prevent switch- ing noise from reaching the input voltage bus. In the SMA16 (surface mount) converters Cin = 30µF of high quality ceramic capacitors. With Lin of 1µH, Cd should be 100- 200µF and Rd should be 0.1-0.2W, in most applications. For more information on designing the input filter and choosing prop- er values, contact SynQor technical support. Adding significant external pure ceramic capacitance directly across the converter's input pins is not recommended. Parasitic inductance associated with the input pin geometry and PCB traces can create a high-Q CLC circuit with any external capaci- tors. Just a few nano-Henries of parasitic inductance can create a resonance (or an overtone) near the converter's switching fre- quency. Cin has a reactance of 10-20mW at the 300kHz switch- ing frequency. To avoid this high-frequency resonance, any exter- nal input filter should exhibit a net source impedance of at least 20mW resistive through this frequency range. This requirement is easily met with the damping elements discussed above. Adding a small amount (a few µF) of high-frequency external ceramic will not violate it. If using converters at higher powers, consider the ripple current rating of Cd. Contact SynQor technical support for details. Output Capacitance: It is recommended to add at least 100µF of capacitance, with an ESR in the 0.1W range, to the out- put of the SMA16 series of converters. The VMA16 series has this capacitance included internally. In many applications, how- ever, additional external output capacitance is required to reduce the response to load transients to an allowable level. The output impedance of these converters can be quite accurately modeled from DC to about 100kHz as shown in Figure F. A further simplified ver- sion of it, valid below 40Hz and above 1kHz, is shown in Figure G. In the SMA16 case, the mod- els depict the minimum recommended output capacitance, Ct with its resistance Rt. In the VMA16 family, that capacitor is again included in the con- verter. If the dynamic char- acteristics of the load are known, any stan- dard simulator can use these models to predict the in-circuit transient response. For minimal overshoot upon recovery, Cd should be related to the minimum in-circuit net ESR. For more detailed derivations of these values contact SynQor technical support. Figure F: NQ04 Passive Output Model Figure G: Simplified NQ04 Output Model Figure H: Converter with Additional Output Capacitance Cd > parallel (L1, L2) ESRdmin2 Figure E: NQ04 converter with Input Filter |
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