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NQ10W50PKA07QS4-G Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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NQ10W50PKA07QS4-G Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 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 11 Continuous vs Discontinuous Conduction Modes: Table 1 summarizes the difference among the converter versions. Referring to the last 3 digits of the part number, the QS1 and QS2 versions are configured to enable discontinuous conduction mode (DCM) operation at light loads, whereas the QS3 and QS4 ver- sions force continuous conduction mode (CCM) operation. Table 2 shows the typical load current corresponding to the boundary for light-load discontinuous operation. Following are the main performance differences between the two versions: 1) Current-sinking: A DCM version (QS1, QS2) will not sink cur- rent if its output is backdriven, whereas a CCM version will sink current as needed to regulate its output voltage, though such neg- ative current might be limited to a few amps but may exceed 10Amps. Since this is not a normal operating condition, the neg- ative current limit is not specified. 2) Light-load input power: The main advantage of DCM opera- tion is lower input current at light loads, down to only about 4 mil- liamps with no-load (for all input/output voltage conditions). The efficiency improvement of the DCM version only becomes evident as the load is reduced below 1.5A for a 5.0V output. This thresh- old gradually falls to about 1 Amp at 2.5V and 0.75A at 0.7V, as shown in Table 2 below. 3) Light-load output ripple: The output ripple of the DCM version has a higher amplitude, as well as a significant amount of low-fre- quency content at light loads (as low as 200Hz for 0.7Vout at no- load). With the same output capacitance, peak-to-peak output voltage ripple at light-loads may be 3 to 10 times as large for DCM as for the CCM version. At heavier loads, all versions oper- ate in continuous conduction and have very low output voltage ripple. 4) Transient response: The CCM version has a better response to dynamic loads. The output voltage deviation, while excellent on both versions, is about 20% lower on the CCM version. With a falling load step, a longer settling time may also be noticeable, especially when stepping into very light loads, as there is no cur- rent sinking capability to quickly reduce the output voltage from its peak deviation. 5) No-Load Regulation: When operating in discontinuous mode with extremely light loads (<50mA), the output voltage may rise by 1 to 2% beyond the specified tolerance. Setting Output Voltage (VADJ, pin 11): This converter is a wide-output module and requires external resistors R1 and R2 (see Figure 17) to set the output voltage. The output voltage is set by the ratio between R1 and R2 in parallel with an internal 100K resistor as follows: where Vref is given in Table 1 above. In terms of the top resistor R2, the trim equation is: The recommended value for bottom resistor R1 is 1.0K. Significantly larger values of R1 will degrade the DC accuracy of the remote sensing, particularly with high output voltages where the trim resistor R2 becomes comparable to the internal 100K par- allel resistor. If remote sensing is not used, larger values of R1 up to 5.0K may be used. Total DC Variation of Vout: For the converter to meet its spec- ifications, the maximum variation of the DC value of the convert- er output voltage, due to voltage adjustment, margining, and remote load voltage drops, should not be greater than that spec- ified for the output voltage trim range. Differential Remote Sense: Using the differential remote sense feature, the converter can be configured to adjust its output voltage up to compensate for resistive drops between the con- verter and the load. Differential remote sensing is achieved by a Kelvin connection of the top trim resistor R2 (see Figure 17) and the CTRL GND pin respectively to the Vout and common rails at the desired remote location. The other end of R2 connects to the VADJ pin, and the bottom trim resistor R1 connects between the Output Voltage Setpoint Boundary Current for Output Ripple Efficiency Advantage Boundary Current 0.7V - 1.8V 2.0 Amps 0.75Amps 2.5V 2.2 Amps 1.0 Amps 3.3V 2.4 Amps 1.2 Amps 5.0V 2.6 Amps 1.5 Amps Version Vref Light-Load Operating Mode QS1 0.7V Discontinuous (DCM) Enabled QS2 VSET pin Discontinuous (DCM) Enabled QS3 VSET pin Forced Continuous (CCM) QS4 0.6V Forced Continuous (CCM) Table 1: Version differences Table 2: Boundary currents below which DCM operation increases ripple and improves efficiency R2 = (Vout - Vref) * R1 * 100K Vref * (R1 + 100K) - Vout * R1 Vout = Vref * [1 + (R2 || 100K) / R1] With R1=1K R2 (in kohm) = (Vout - Vref) * 100 101 * Vref - Vout |
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