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NQ16W50VKA10PRS Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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NQ16W50VKA10PRS Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Product # NQ16W50xKA10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NK12WE Rev. A 11/26/07 Page 10 Input: Input: Outputs: Outputs: Current: Current: PPackage: ackage: 6.0 - 16.0V 6.0 - 16.0V 0.75 - 5.0V 0.75 - 5.0V 10A 10A SIP SIP T Technical S echnical Specification pecification BASIC OPERATION AND FEATURES The NiQor series non-isolated converter uses a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The NiQor modules employ synchronous rectification for very high efficiency. Dissipation throughout the converter is so low that it does not require a heatsink or metal baseplate for operation. The NiQor converter can thus be built more simply and reliably using high yield surface mount techniques on a single PCB substrate. The NiQor series of SIPs and SMT converters uses the established industry standard footprint and pin-out configurations. CONTROL FEATURES REMOTE ON/OFF: The ON/OFF input permits the user to con- trol when the converter is on or off. There are currently two options available for the ON/OFF input described in the table below. Others may become available if demand exists. OUTPUT VOLTAGE TRIM: The TRIM input permits the user to adjust the output voltage according to the trim range specifica- tions by using an external resistor. If the TRIM feature is not being used, leave the TRIM pin disconnected. TRIM-UP: To increase the output voltage from the nominal set- point of 0.7525V using an external resistor, connect the resistor Rtrim-up between the TRIM and the Ground pin according to the diagram below. For a desired increase of the nominal output voltage, the value of the resistor should be: To maintain the accuracy of the output voltage over load current, it is vital that any trim-up resistor be terminated directly to the con- verter's ground foot, not at the connection to the load. A sepa- rate Kelvin connection to the PCB pad for the ground foot is opti- mal. Trim-down resistors should be terminated at the converter's Sense+ pin. We do not recommend bypassing the trim pin directly to ground with a capacitor. The voltage gain from the trim pin to output is rather large, 15:1. Ground bounce through a bypass capacitor could introduce significant noise to the converter's control circuit. PROTECTION FEATURES Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the appli- cation note titled “Input System Instability”. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Current Limiting: To provide protection in an output over load fault condition, the unit is equipped with internal over- current protection. When the over-current protection is triggered, the unit enters hiccup mode. The units operate normally once the fault condition is removed. Internal Over-Voltage Protection: To fully protect from excessive output voltage, the NQ16 series contains an Output Over-Voltage Shutdown circuitry. This OVP is independent of the trimmed setpoint. As such, the converter's load is protected from faults in the external trim cir- cuitry (such as a trim pin shorted to ground). Since the setpoint of this OVP does not track trim, it is set at 6.0V, in the wide-trim W50 model. Rtrim-up Vin On/Off Vout Sense+ Trim Gnd (W) Rtrim-up = where VDES = Desired Output Voltage VDES - 0.7525 10500 _ 1000 (W) VOUT = 10500 Rtrim-up + 1000 or 0.7525 + Option Description Pin-Open Float Voltage Pin-Open Converter State Pin Action P Logic Positive/Open 5 On Pull Low = Off O Logic Negative/Open 0 On Pull High = Off |
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