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ISL6263CHRZ Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL6263CHRZ Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 18 page 10 FN6745.1 July 8, 2010 Static Regulation The output voltage VOUT will be regulated to the value set by the VID inputs per Table 1. A true differential amplifier connected to the VSEN and RTN pins implements processor Kelvin sense for precise core voltage regulation at the GPU voltage sense points. The ISL6263C can accommodate DCR current sense or discrete resistor current sense. The DCR current sense uses the intrinsic series resistance of the output inductor, as shown in the application circuit of Figure 2. The discrete resistor current sense uses a shunt resistor in series with the output inductor, as shown in the application circuit in Figure 3. In both cases, the signal is fed to the non-inverting input of the current sense amplifier at the ISP pin, where it is measured differentially with respect to the output voltage of the converter at the VO pin and amplified. The voltage at the ICOMP pin minus the output voltage measured at the VO pin, is proportional to the total inductor current. This information is used for overcurrent protection and current monitoring. It is important to note that this current measurement should not be confused with the synthetic current ripple information created within the R3 modulator. When using inductor DCR current sense, an NTC compensation network is optional to compensate the positive temperature coefficient of the copper winding, thus maintaining the current sense accuracy. Processor Kelvin Voltage Sense The remote voltage sense input pins VSEN and RTN of the ISL6263C are to be terminated at the die of the GPU. Kelvin sense allows the voltage regulator to tightly control the processor voltage at the die, compensating for various resistive voltage drops in the power delivery path. Since the voltage feedback is sensed at the processor die, removing the GPU will open the voltage feedback path of the regulator, causing the output voltage to rise towards VIN. The ISL6263C will shut down when the voltage between the VO and VSS pins exceeds the severe overvoltage protection threshold VOVPS of 1.55V. To prevent this issue from occurring, it is recommended to install resistors ROPN1 and ROPN2, as shown in Figure 5. These resistors provide voltage feedback from the regulator local output in the absence of the GPU. These resistors should be in the range of 20Ω to 100Ω . VR_ON VSOFT/VOUT PGOOD 13 SWITCHING CYCLES ~100µs 90% FIGURE 4. ISL6263C START-UP TIMING FIGURE 5. SIMPLIFIED GPU KELVIN SENSE AND INDUCTOR DCR CURRENT SENSE ISP ISN + − + − + − VO VSEN RTN + − VDIFF OCP OCSET ICOMP Isense ROCSET COUT LOUT RS ESR DCR PHASE VOUT VGND TO PROCESSOR KELVIN CONNECTIONS RFILTER1 RFILTER2 CFILTER1 CFILTER2 CFILTER3 ↓ VDD 10µA ISL6263C |
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