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ISL6326BCRZ Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL6326BCRZ Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 30 page  10 FN9286.0 April 21, 2006 OFS - The OFS pin can be used to program a DC offset current which will generate a DC offset voltage between the REF and DAC pins. The offset current is generated via an external resistor and precision internal voltage references. The polarity of the offset is selected by connecting the resistor to GND or VCC. For no offset, the OFS pin should be left unterminated. TCOMP - Temperature compensation scaling input. The voltage sensed on the TM pin is utilized as the temperature input to adjust ldroop and the overcurrent protection limit to effectively compensate for the temperature coefficient of the current sense element. To implement the integrated temperature compensation, a resistor divider circuit is needed with one resistor being connected from TCOMP to VCC of the controller and another resistor being connected from TCOMP to GND. Changing the ratio of the resistor values will set the gain of the integrated thermal compensation. When integrated temperature compensation function is not used, connect TCOMP to GND. IOUT - IOUT is the output pin of sensed average channel current. In actual application, a resistor needs to be placed between IOUT and GND to ensure the proper operation. The voltage at IOUT pin will be proportional to the load current and the resistor value. ISL6326B monitors the voltage at IOUT for overcurrent protection. If the voltage at IOUT pin is higher than 2V, it will trigger the overcurrent shutdown. By choosing the proper value for the resistor at IOUT pin, the overcurrent trip level can be set to be lower than the fixed internal overcurrent threshold. Tie it to GND if not used. TM - TM is an input pin for the VR temperature measurement. Connect this pin through an NTC thermistor to GND and a resistor to VCC of the controller. The voltage at this pin is reverse proportional to the VR temperature. ISL6326B monitors the VR temperature based on the voltage at the TM pin and outputs VR_HOT and VR_FAN signals. VR_HOT - VR_HOT is used as an indication of high VR temperature. It is an open-drain logic output. It will be pulled low if the measured VR temperature is less than a certain level, and open when the measured VR temperature reaches a certain level. A external pull-up resistor is needed. VR_FAN - VR_FAN is an output pin with open-drain logic output. It will be pulled low if the measured VR temperature is less than a certain level, and open when the measured VR temperature reaches a certain level. A external pull-up resistor is needed. Operation Multiphase Power Conversion Microprocessor load current profiles have changed to the point that the advantages of multiphase power conversion are impossible to ignore. The technical challenges associated with producing a single-phase converter which is both cost-effective and thermally viable have forced a change to the cost-saving approach of multiphase. The ISL6326B controller helps reduce the complexity of implementation by integrating vital functions and requiring minimal output components. The block diagrams on pages 3, 4, and 5 provide top level views of multiphase power conversion using the ISL6326B controller. Interleaving The switching of each channel in a multiphase converter is timed to be symmetrically out of phase with each of the other channels. In a 3-phase converter, each channel switches 1/3 cycle after the previous channel and 1/3 cycle before the following channel. As a result, the three-phase converter has a combined ripple frequency three times greater than the ripple frequency of any one phase. In addition, the peak-to- peak amplitude of the combined inductor currents is reduced in proportion to the number of phases (Equations 1 and 2). Increased ripple frequency and lower ripple amplitude mean that the designer can use less per-channel inductance and lower total output capacitance for any performance specification. Figure 1 illustrates the multiplicative effect on output ripple frequency. The three channel currents (IL1, IL2, and IL3) combine to form the AC ripple current and the DC load current. The ripple component has three times the ripple frequency of each individual channel current. Each PWM pulse is terminated 1/3 of a cycle after the PWM pulse of the previous phase. The DC components of the inductor currents combine to feed the load. FIGURE 1. PWM AND INDUCTOR-CURRENT WAVEFORMS FOR 3-PHASE CONVERTER 1µs/DIV PWM2, 5V/DIV PWM3, 5V/DIV IL2, 7A/DIV IL3, 7A/DIV IL1 + IL2 + IL3, 7A/DIV IL1, 7A/DIV PWM1, 5V/DIV ISL6326B |
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