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ISL6568IRZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL6568IRZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 28 page 8 FN9187.3 July 25, 2005 through a 50k Ω resistor. To encode the DAC with AMD Hammer VID codes, connect this pin to a +5V source through a 5k Ω resistor. VSEN and RGND VSEN and RGND are inputs to the precision differential remote-sense amplifier and should be connected to the sense pins of the remote load. ICOMP, ISUM, and IREF ISUM, IREF, and ICOMP are the DCR current sense amplifier’s negative input, positive input, and output respectively. For accurate DCR current sensing, connect a resistor from each channel’s phase node to ISUM and connect IREF to the summing point of the output inductors, roughly Vout. A parallel R-C feedback circuit connected between ISUM and ICOMP will then create a voltage from IREF to ICOMP proportional to the voltage drop across the inductor DCR. This voltage is referred to as the droop voltage and is added to the differential remote-sense amplifier output. NOTE: An optional 0.01 µF ceramic capacitor can be placed from the IREF pin to the ISUM pin to help reduce any noise affects that may occur due to layout. VDIFF VDIFF is the output of the differential remote-sense amplifier. The voltage on this pin is equal to the difference between VSEN and RGND added to the difference between IREF and ICOMP. VDIFF therefore represents the output voltage plus the droop voltage. FB and COMP These pins are the internal error amplifier inverting input and output respectively. FB, VDIFF, and COMP are tied together through external R-C networks to compensate the regulator. REF The REF input pin is the positive input of the error amplifier. It is internally connected to the DAC output through a 1k Ω resistor. A capacitor is used between the REF pin and ground to smooth the voltage transition during Dynamic VID operations. OFS The OFS pin provides a means to program a dc current for generating an offset voltage across the resistor between FB and VDIFF. 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 unconnected. OCSET This is the overcurrent set pin. Placing a resistor from OCSET to ICOMP allows a 100 µA current to flow out this pin, producing a voltage reference. Internal circuitry compares the voltage at OCSET to the voltage at ISUM, and if ISUM ever exceeds OCSET, the overcurrent protection activates. ISEN1 and ISEN2 These pins are used for balancing the channel currents by sensing the current through each channel’s lower MOSFET when it is conducting. Connect a resistor between the ISEN1 and ISEN2 pins and their respective phase node. This resistor sets a current proportional to the current in the lower MOSFET during its conduction interval. UGATE1 and UGATE2 Connect these pins to the corresponding upper MOSFET gates. These pins are used to control the upper MOSFETs and are monitored for shoot-through prevention purposes. Maximum individual channel duty cycle is limited to 66%. BOOT1 and BOOT2 These pins provide the bias voltage for the corresponding upper MOSFET drives. Connect these pins to appropriately- chosen external bootstrap capacitors. Internal bootstrap diodes connected to the PVCC pins provide the necessary bootstrap charge. PHASE1 and PHASE2 Connect these pins to the sources of the upper MOSFETs. These pins are the return path for the upper MOSFET drives. LGATE1 and LGATE2 These pins are used to control the lower MOSFETs. Connect these pins to the corresponding lower MOSFETs’ gates. PGOOD During normal operation PGOOD indicates whether the output voltage is within specified overvoltage and undervoltage limits. If the output voltage exceeds these limits or a reset event occurs (such as an overcurrent event), PGOOD is pulled low. PGOOD is always low prior to the end of soft-start. Operation Multi-Phase Power Conversion Microprocessor load current profiles have changed to the point that the advantages of multi-phase power conversion are impossible to ignore. The technical challenges associated with producing a single-phase converter that is both cost-effective and thermally viable have forced a change to the cost-saving approach of multi-phase. The ISL6568 controller helps simplify implementation by integrating vital functions and requiring minimal external components. The block diagram on page 2 provides a top level view of multi-phase power conversion using the ISL6568 controller. ISL6568 ISL6568 |
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