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NQ10W50PKA07QS4-G Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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NQ10W50PKA07QS4-G Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 14 page  Input: Input: Outputs: Outputs: Current: Current: PPackage: ackage: 10.2 - 13.2V 10.2 - 13.2V 0.7 - 5.0V 0.7 - 5.0V 7A 7A SMT SMT T Technical S echnical Specification pecification Product # NQ10W50PKA07 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS2T5N Rev. B 6/12/07 Page 10 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. CONTROL FEATURES Remote ON/OFF (OE, pin 2): The OE (output enable) input, pin 2, permits the user to control when the converter is on or off. The OE pin connects directly to the enable pin of the PWM chip and must be pulled high to turn the converter on (see the speci- fication pages for on/off logic thresholds). The converter has an internal 332K resistor from this pin to CTRL GND (pin 1). PROTECTION FEATURES Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification pages) 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 con- verter will turn off. Output Current Limiting: This converter employs foldback cur- rent limiting. A typical output voltage-current curve is shown in Figure 16 in the Performance Curves section. At room tempera- ture current limit is reached at about 170% of rated current. Loads in excess of that limit will cause the output to droop. If the load is sufficient to pull the output down to approximately 50% of its nominal setpoint, the output current will begin to foldback. If the load continues to increase, the output current will decrease lin- early to about 30% of the rated current at zero Vout. While oper- ating into this dead short condition the unit will deliver 2-3A indef- initely reducing stress and ensuring prolonged short-circuits will not overheat the converter. Since there is no "hiccup mode" to the current-limit operation, there is also no concern with operation or startup into large capacitive loads. The voltage may rise slowly while charging the output capacitance, but it will rise. There are also no problems starting into a load that has a resis- tive V-I curve. As long as the load draws less than the current limit value at 1/2 of the unit's setpoint voltage, proper startup is ensured. Because the current limit tolerance is rather large, a fuse is rec- ommended in series with the input source of each unit. The rat- ing of the fuse should be above but as close as possible to the maximum input current specified on the specification pages. These maximum input currents account for full load conditions, maximum ambient temperature, and minimum input voltage. The curves for power dissipation vs load current may be used to esti- mate the reduction of input current at lighter load conditions. APPLICATION CONSIDERATIONS Input Over-Voltage Prevention: The power system designer must take precautions to prevent damaging the NiQor converters by input overvoltage. This is another reason to be careful about damping the input filter so that no ringing occurs from an under- damped filter. The voltage must be prevented from exceeding the absolute maximum voltage indicated in the Electrical Specifications section of the data sheet under all conditions of turn-on, turn-off and load transients and fault conditions. The power source should have an over voltage shutdown threshold as close as reasonably possible to the operating point. External Output Capacitance: This converter is designed to operate with all-ceramic output capacitance. Although addition- al bulk output capacitance of other types may be found to improve performance, the output capacitance recommendations are generally based on low-ESR ceramic capacitors. A minimum of 110uF of ceramic capacitance should be placed as close as possible to the converter and preferably mounted directly under the converter on the opposite side of the converter with VOUT and PWR GND planes used to minimize the inductance of this con- nection. In order to maintain the desired capacitance up to high- er output voltages, 5 22uF/1210 capacitors are recommended. To achieve the transient response specifications, 376uF is recom- mended. When operating the QS1 or QS2 version at light loads (see CCM vs DCM section), even more capacitance may be desired to reduce the output ripple voltage. Due to the low-fre- quency content of the discontinuous mode output voltage ripple, tantalum or polymer type capacitors may also be useful in reduc- ing this ripple. In general, more capacitance is needed, particu- larly at high voltages, when using 100uF 1210 6.3V capacitors or other low voltage X5R capacitors which can similarly drop to 1/3 of their nominal value at a bias voltage of 5V. |
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