ISL6565 Intersil Corporation, ISL6565 Datasheet
ISL6565
Available stocks
Related parts for ISL6565
ISL6565 Summary of contents
Page 1
... Multi-phase buck converter architecture uses interleaved timing to multiply channel ripple frequency and reduce input and output ripple currents. The difference between the ISL6565A and the ISL6565B is that the ISL6565A utilizes r current sensing, while the DS(ON) ISL6565B utilizes DCR current sensing for each phase ...
Page 2
... Pinouts ISL6565ACB (SOIC), ISL6565ACV (TSSOP) TOP VIEW OVP 1 28 PGOOD 2 27 VID4 3 26 VID3 4 25 VID2 5 24 VID1 6 23 VID0 7 22 VID12 OFS TCOMP 19 REF COMP VDIFF 15 ISL6565BCB (SOIC), ISL6565BCV (TSSOP) TOP VIEW OVP 1 28 PGOOD ...
Page 3
... ISL6565A Block Diagram PGOOD VDIFF RGND x1 VSEN UVP OVP +200mV x 0.75 VID4 VID3 DYNAMIC VID2 VID VID1 D/A VID0 VID12.5 REF FB COMP ∑ OFS OFFSET TEMP TCOMP COMP 3 ISL6565A, ISL6565B OVP VCC OVP S R SHUNT POWER-ON LATCH REGULATOR RESET Q SOFT START AND FAULT LOGIC ...
Page 4
... ISL6565B Block Diagram PGOOD VDIFF RGND x1 VSEN UVP OVP +200mV x 0.75 VID4 VID3 DYNAMIC VID2 VID VID1 D/A VID0 VID12.5 REF FB COMP ∑ OFS OFFSET TEMP TCOMP COMP 4 ISL6565A, ISL6565B OVP VCC OVP R S SHUNT POWER-ON LATCH REGULATOR RESET Q SOFT START AND FAULT LOGIC ...
Page 5
... Typical Application - ISL6565A +5V COMP VCC FB VDIFF TCOMP VSEN RGND PGOOD REF OVP ISL6565A VID4 PWM1 ISEN1 VID3 VID2 PWM2 VID1 ISEN2 VID0 PWM3 VID12.5 ISEN3 OFS GND ENLL R T +12V VID_PGOOD 5 ISL6565A, ISL6565B +5V VCC BOOT UGATE EN PHASE ISL6605 LGATE PWM ...
Page 6
... Typical Application - ISL6565B +5V FB COMP VCC VDIFF TCOMP VSEN RGND PGOOD REF OVP ISL6565B VID4 PWM1 ISEN1 VID3 VID2 PWM2 VID1 ISEN2 VID0 PWM3 VID12.5 ISEN3 ICOMMON OFS FS GND ENLL +12V VID_PGOOD 6 ISL6565A, ISL6565B +5V VCC BOOT UGATE EN PHASE ISL6605 LGATE ...
Page 7
... VID Input Low Level VID Input High Level DAC Source/Sink Current REF Source/Sink Current PIN-ADJUSTABLE OFFSET Voltage at OFS pin 7 ISL6565A, ISL6565B Thermal Information Thermal Resistance + 0.3V SOIC Package (Note QFN Package (Notes 2, 3 TSSOP Package (Note ...
Page 8
... When using the internal shunt regulator, VCC is clamped to 6.02V (max). Current must be limited to 25mA or less. 5. These parts are designed and adjusted for accuracy with all errors in the voltage loop included. 6. During soft start, VDAC rises from 0 to VID. The over-voltage trip level is the higher of 1.7V and VDAC + 0.2V. 8 ISL6565A, ISL6565B TEST CONDITIONS R = 100 kΩ ...
Page 9
... Connecting the 12V supply to EN through an appropriate resistor divider provides a means to synchronize power-up of the controller and the MOSFET driver ICs. When EN is driven above 1.31V, the ISL6565A, ISL6565B is active depending on status of ENLL, the internal POR, and pending fault states. Driving EN below 1.14V will clear all fault states and prime the ISL6565A, ISL6565B to soft start when re-enabled ...
Page 10
... ISL6565A, ISL6565B controller helps simplify implementation by integrating vital functions and requiring minimal output components. The block diagrams on pages 2 and 3 provide top level views of multi-phase power conversion using the ISL6565A and ISL6565B controllers. IL1 + IL2 + IL3, 7A/DIV IL3, 7A/DIV PWM3, 5V/DIV PWM2, 5V/DIV ...
Page 11
... MOSFET r DS(ON) The ISL6565A senses the channel load current by sampling the voltage across the lower MOSFET r Figure 4. A ground-referenced operational amplifier, internal to the ISL6565A, is connected to the PHASE node through a resistor The voltage across R ISEN the voltage drop across the r while it is conducting. The resulting current into the ISEN pin is proportional to the channel current, I ...
Page 12
... R + CHANNEL N LOWER MOSFET ISL6565A INTERNAL CIRCUIT EXTERNAL CIRCUIT FIGURE 4. ISL6565A INTERNAL AND EXTERNAL CURRENT- SENSING CIRCUITRY INDUCTOR DCR SENSING (ISL6565B ONLY) Inductor windings have a characteristic distributed resistance or DCR (Direct Current Resistance). For simplicity, the inductor DCR is considered as a separate lumped quantity, as shown in Figure 5. The channel current I , flowing through the inductor, passes through the DCR ...
Page 13
... DAC) and offset errors in the OFS current source, remote-sense and error amplifiers. Intersil specifies the guaranteed tolerance of the ISL6565A, ISL6565B to include the combined tolerances of each of these elements. The output of the error amplifier, V COMP sawtooth waveform to generate the PWM signals ...
Page 14
... ISL6565A, ISL6565B TABLE 1. VOLTAGE IDENTIFICATION (VID) CODES (Continued) VID12.5 VDAC VID4 0 0.8375V 1 1 0.8500V 1 0 0.8625V 1 1 0.8750V 1 0 0.8875V 1 1 0.9000V 1 0 0.9125V 1 1 0.9250V 1 0 ...
Page 15
... ISEN Output-Voltage Offset Programming The ISL6565A, ISL6565B allows the designer to accurately adjust the offset voltage by connecting a resistor, R from the OFS pin to VCC or GND. When R between OFS and VCC, the voltage across it is regulated to 2.0V. This causes a proportional current (I the OFS pin and out of the FB pin ground, the voltage across it is regulated to 0 ...
Page 16
... ERR AVG T AMBIENT AMBIENT In order to compensate for this error current, the ISL6565A, ISL6565B includes a temperature compensation circuit that injects a current into the FB pin. This current is TCOMP 16 ISL6565A, ISL6565B created by pushing the average sense current through a selectable external resistor ...
Page 17
... ICs reach their POR level before the ISL6565A, ISL6565B becomes enabled. The schematic in Figure 11 demonstrates sequencing the ISL6565A, ISL6565B with the HIP660X family of Intersil MOSFET drivers, which require 12V bias. 3. The voltage on ENLL must be logic high to enable the controller ...
Page 18
... I AVG MOSFETs. If the over-voltage condition reoccurs, the ISL6565A, ISL6565B will again command the lower MOSFETs to turn on. The ISL6565A, ISL6565B will continue to protect the load in this fashion as long as the over-voltage OVP condition recurs. Simultaneous to the protective action of the PWM outputs, the ...
Page 19
... All surface-mount designs will tend toward the lower end of this current range. 19 ISL6565A, ISL6565B If through-hole MOSFETs and inductors can be used, higher per-phase currents are possible. In cases where board space is the limiting constraint, current can be pushed as ...
Page 20
... INDUCTOR DCR SENSING (ISL6565B ONLY shown in DS(ON) The ISL6565B senses the channel load current by sampling the voltage across the output inductor DCR, as described in the Current Sensing section. As Figure 16 illustrates, an R-C network across the inductor is required to sense the channel current accurately. ...
Page 21
... N Adjusting Phase Currents (ISL6565B Only) Layout issues in the core-power regulator may cause the currents in each phase to be slightly unbalanced. This problem can be resolved without any changes to the layout or any significant cost increase. The solution requires populating R in certain phases (as shown in Figure 16) to create a 2 resistor divider ratio, K, for each phase ...
Page 22
... Equation 38 the temperature coupling coefficient T between the ISL6565A and the closest lower MOSFET, or the ISL6565B and the output inductor. It represents how closely the controller temperature tracks the lower MOSFET or inductor temperature. The value of K 75% and100 the temperature dependant TC transconductance of the internal compensation circuit ...
Page 23
... V DROOP - VDIFF FIGURE 17. COMPENSATION CONFIGURATION FOR LOAD-LINE REGULATED ISL6565A, ISL6565B CIRCUIT Since the system poles and zero are affected by the values of the components that are meant to compensate them, the solution to the system equation becomes fairly complicated. Fortunately, there is a simple approximation that comes very close to an optimal solution ...
Page 24
... ISL6565A, ISL6565B Input Supply Voltage Selection The VCC input of the ISL6565 can be connected either directly to a +5V supply or through a current limiting resistor to a +12V supply. An integrated 5.8V shunt regulator maintains the voltage on the VCC pin when a +12V supply is used. A (EQ. 41) 300Ω resistor is suggested for limiting the current into the VCC pin to a worst-case maximum of approximately 25mA ...
Page 25
... RMS current calculated. The voltage rating of the capacitors should also be at least 1.25 times greater than the maximum input voltage. Figure 20 provides the same input RMS current information for three phase designs respectively. Use the same approach for selecting the bulk capacitor type and number. 25 ISL6565A, ISL6565B 0.3 0.2 0.1 0 0.8 1.0 ...
Page 26
... CORNER REF. OPTION 4X BOTTOM VIEW SECTION "C-C" TERMINAL TIP FOR ODD TERMINAL/SIDE FOR EVEN TERMINAL/SIDE 26 ISL6565A, ISL6565B L28.5x5 28 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VHHD-1 ISSUE SYMBOL 0.10 C 0.08 C ...
Page 27
... The lead width “B”, as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch) 10. Controlling dimension: MILLIMETER. Converted inch dimen- sions are not necessarily exact. 27 ISL6565A, ISL6565B M28.3 (JEDEC MS-013-AE ISSUE C) 28 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE M B ...
Page 28
... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 28 ISL6565A, ISL6565B M28.173 28 LEAD THIN SHRINK SMALL OUTLINE PLASTIC PACKAGE ...