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These resistors are used to sense the DC voltage drop across each inductor. Figure 45 shows dataeheet thermal throttling feature with hysteresis. Refer to Figure This is fairly easy and can be accomplished by allowing the system to achieve thermal equilibrium at full load, and then adjusting Rdrp2 to obtain the desired Droop value. First we calculate the equivalent NTC network resistance, Rn.
Attention has be paid to il6260 input resistor to the FB pin. If the voltage on the NTC pin goes below the 1.
Multiphase Core Regulator For IMVP-6 Mobile CPUs
RS is determined through an understanding of both the DC and transient load currents. As long as the inductor time constant matches the droop circuit Iisl6260 time constants as given above, the transient performance will be optimum. Now, the input to the Droop amplifier is the Vrsense voltage. DFB Inverting input to droop amplifier. There is a 6? Voltage Regulator Thermal Throttling lntel? NTC thermistor will be placed in the hot spot of the board.
The power stage parameters such as L and Cs are needed as the input to calculate the compensation component values. The pin 1 indentifier may be either a mold or mark feature. The user should have 40A load current on the converter and look for 84mV droop. And the power monitor pin provides an analog signal representing the output power of the converter. The overcurrent and way-overcurrent protection level in datasheet phase mode operation will be adjusted as two-to-one as well.
Current sensing can be done using either DCR sensing or discrete precision resistor sensing. Therefore, a resistor is needed to be in series with the NTC. These values are extremely sensitive to layout and coupling factor of the NTC to the inductor. With both the outputs of RO and RS tied together, the simplified model for the droop circuit can be derived. Figure 48 shows the equivalent circuit of a discrete current sense approach.
In Figure 46 we show a 3 phase solution using DCR sensing. When discrete resistor sensing is used, a capacitor of 10nF should be placed in parallel with RL to properly compensate the current balance circuit.
(PDF) ISL6260 Datasheet download
Note, we choose to ignore the RO resistors because they do not add significant error. If the system is not compensated correctly, the output voltage could sag excessively upon load application and potentially create a system failure. The configuration of the pin 1 identifier is optional, but must be located within the zone indicated.
Intersil Pb-free plus anneal products employ special Pb-free. But those caps are only available in small capacitance values. In order to use such capacitors, the resistors and thermistors surrounding the droop isk6260 sensing and droop amplifier has to be resized up to 10x to reduce the capacitance by 10x. Too high of a resistor will cause an error to the output voltage regulation because of bias current flowing in the FB pin.
ISL datasheet, Pinout ,application circuits Multiphase Core Regulator For IMVP-6 Mobile CPUs
Rn is then given by Equation datashedt. Superior Noise Immunity and Transient Response? Intel Mobile Voltage Positioning is a smart voltage regulation. The ISLC has several other key features. In the above example, the two errors add to 4A. But attention has to be paid in balancing the impedance of droop amplifier in this case.
The output voltage could also take a long period of time to settle to its final value. There is a mathematical calculation file available to the user. No NTC thermistor is needed and the droop circuit is simplified. Knowing this voltage droop level, one can program in the appropriate drop across the Roc resistor.
At heavy load conditions, the ISL is switching at a relatively constant switching frequency similar to datasneet frequency PWM controller. A 47pF capacitor can be used for such purposes.
It is highly recommended to use symmetrical layout in order to achieve natural current balance. ISLC uses RC filter to sense the average voltage on phase node and forces the average voltage on the phase node to be equal for current balance. VIN Battery supply voltage, used for feed forward. The multiple phase implementation results in better system performance, superior thermal management, lower component cost, reduced power dissipation, and smaller implementation area.
It is better to keep this resistor below 3k when datasheft this file. This cap needs to be a high grade cap like X7R with low tolerance. A unity gain, differential amplifier is available for remote voltage sensing. When this voltage is summed with the other channels DC voltages, the total DC load current can be derived.