isl6326b Intersil Corporation, isl6326b Datasheet
isl6326b
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isl6326b Summary of contents
Page 1
... Eliminating ground differences improves regulation and protection accuracy. The threshold- sensitive enable input is available to accurately coordinate the start up of the ISL6326B with any other voltage rail. Dynamic-VID™ technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting ...
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... Pinout VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OFS DAC 2 ISL6326B ISL6326B (40 LD QFN) TOP VIEW GND ISEN3 ISEN3- ISEN2- 28 ISEN2 PWM2 PWM4 25 ISEN4+ 24 ISEN4- ...
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... ISL6326BCR Block Diagram VDIFF - RGND X1 + VSEN SOFTSTART + OVP AND - FAULT LOGIC +175m V SS VRSEL VID7 VID6 VID5 Dynam ic VID4 VID VID3 D/A VID2 VID1 VID0 DAC OFS OFFSET REF FB COMP 2. IOUT VR_HOT TEMPERATURE THERMAL COMPENSATION MONITOR VR_FAN TM 3 ISL6326B VR_RDY FS CLOCK AND ...
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... ISEN2+ VID0 VRSEL PWM3 VR_FAN ISEN3- VR_HOT ISEN3+ VIN EN_PWR GND PWM4 IOUT ISEN4- ISEN4+ TCOMP TM OFS FS +5V +5V NTC 4 ISL6326B +12V PVCC VCC ISL6612 DRIVER PWM DAC REF +12V PVCC VCC ISL6612 DRIVER PWM +12V PVCC VCC ISL6612 DRIVER PWM +12V SS ...
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... ISEN3+ VID0 VRSEL ISEN2+ VR_FAN ISEN2- VR_HOT PWM2 VIN EN_PWR PWM4 GND ISEN4- ISEN4+ IOUT TCOMP TM OFS FS +5V NTC 5 ISL6326B +12V VCC DAC GND REF ISL6614 DRIVER PWM1 PWM2 +12V VCC GND ISL6614 DRIVER SS PWM1 PWM2 VIN BOOT1 UGATE1 PHASE1 LGATE1 ...
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... Operating Conditions Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% Ambient Temperature (ISL6326BCRZ 0°C to 70°C Ambient Temperature (ISL6326BIRZ .-40°C to 85°C CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied ...
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... TM Input Voltage for VR_FAN Trip TM Input Voltage for VR_FAN Reset TM Input Voltage for VR_HOT Trip TM Input Voltage for VR_HOT Reset Leakage Current of VR_FAN VR_FAN Low Voltage 7 ISL6326B TEST CONDITIONS Offset resistor connected to ground Voltage below VCC, offset resistor connected to VCC R = 100kΩ 100kΩ ...
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... During soft-start, VDAC rises from 0 to 1.1V first and then ramp to VID voltage after receiving valid VID. 6. Soft-start ramp rate is determined by the adjustable soft-start oscillator frequency at the speed of 6.25mV per cycle. 8 ISL6326B TEST CONDITIONS With externally pull-up resistor connected to VCC With 1.25k resistor pull-up to VCC, I ...
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... When EN_VTT is driven above 0.875V, the ISL6326B is active depending on status of EN_PWR, the internal POR, and pending fault states. Driving EN_VTT below 0.745V will clear all fault states and prime the ISL6326B to soft-start when re-enabled Use this pin to set up the desired switching frequency. A resistor, placed from FS to ground will set the switching frequency ...
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... 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 ...
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... PWM Operation The timing of each channel is set by the number of active channels. The default channel setting for the ISL6326B is four. The switching cycle is defined as the time between PWM pulse termination signals of each channel. The cycle time of the pulse signal is the inverse of the switching frequency set by the resistor between the FS pin and ground ...
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... F is the switching frequency of each phase. SW Current Sensing ISL6326B senses the current continuously for fast response. ISL6326B supports inductor DCR sensing, or resistive sensing techniques. The associated channel current sense amplifier uses the ISEN inputs to reproduce a signal proportional to the inductor current, I ...
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... DAC) and offset errors in the OFS current source, remote-sense and error amplifiers. Intersil specifies the guaranteed tolerance of the ISL6326B to include the combined tolerances of each of these elements. 13 ISL6326B ...
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... ISL6326B TABLE 1. VR10 VID TABLE (WITH 6.25mV EXTENSION) VID6 VOLTAGE VID4 6.25mV (V) 400mV 1.59375 1.5875 1.58125 1.575 1.56875 ...
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... ISL6326B TABLE 1. VR10 VID TABLE (WITH 6.25mV EXTENSION) VID6 VOLTAGE VID4 6.25mV (V) 400mV 0 1 1.1125 1.10625 1 1.09375 OFF OFF 0 ...
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... ISL6326B VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE 0 1 1.45625 1.45000 1.44375 1.43750 1.43125 1.42500 1.41875 ...
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... ISL6326B VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE 0 1 0.95625 0.95000 0.94375 0.93750 0.93125 0.92500 0.91875 ...
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... ISEN 18 ISL6326B Output-Voltage Offset Programming The ISL6326B allows the designer to accurately adjust the offset voltage. When a resistor, R OFS to VCC, the voltage across it is regulated to 1.6V. This causes a proportional current ( connected to ground, the voltage across it is OFS regulated to 0.4V, and I ...
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... After remaining at 1.1V for some time, ISL6326B reads the VID code at VID input pins. If the VID code is valid, ISL6326B will regulate the output to the final VID setting. If the VID code is OFF code, ISL6326B will shut down, and cycling VCC, EN_PWR or EN_VTT is needed to restart ...
Page 20
... Once the controller detects valid VID input, the OVP trip point will be changed to DAC plus 175mV. Two actions are taken by the ISL6326B to protect the microprocessor load when an overvoltage condition occurs. At the inception of an overvoltage event, all PWM outputs (EQ. 17) are commanded low instantly (less than 20ns) ...
Page 21
... MOSFETs to turn on. The ISL6326B will continue to protect the load in this fashion as long as the overvoltage condition occurs. Once an overvoltage condition is detected, normal PWM operation ceases until the ISL6326B is reset. Cycling the voltage on EN_PWR, EN_VTT or VCC below the POR- falling threshold will reset the controller. Cycling the VID codes will not reset the controller ...
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... VCC voltage. Figure 13 shows the operation of those signals. VCC R 0.33V CC TM1 NTC 0.28V CC FIGURE 11. BLOCK DIAGRAM OF THERMAL MONITORING FUNCTION 22 ISL6326B 100% 90% 80% 70% 60% 50% 40% 30% 20% 0 FIGURE 12. THE RATIO OF TM VOLTAGE TO NTC TEMPERATURE WITH RECOMMENDED PARTS TM 0.39*Vcc 0.33*Vcc 0.28*Vcc ...
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... Integrated Temperature Compensation When the TCOMP voltage is equal or greater than VCC/15, ISL6326B will utilize the voltage at TM and TCOMP pins to compensate the temperature impact on the sensed current. The block diagram of this function is shown in Figure 14. V ...
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... FB and VDIFF pins reverse proportional to the temperature. The external temperature compensation network can only compensate the temperature impact on the droop, while it has no impact to the sensed current inside ISL6326B. Therefore, this network cannot compensate for the temperature impact on the overcurrent protection function. General Design Guide ...
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... ISEN – × ISL6326B where R pin the active channel number, R the current sense element, either the DCR of the inductor or R SENSE desired overcurrent trip point. Typically 1.3 times the maximum load current of the specific DS(ON) application. With integrated temperature compensation, the sensed current signal is independent on the operational temperature of the power stage, i ...
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... C is the sum total of all output capacitors; ESR is the equivalent-series resistance of C (OPTIONAL COMP DROOP - VDIFF LOAD-LINE REGULATED ISL6326B CIRCUIT , has already been chosen The target 0 1 ------------------- > 2π LC 2π ...
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... L Input Supply Voltage Selection The VCC input of the ISL6326B 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 300Ω resistor is suggested for limiting the current into the VCC pin to a worst-case maximum of approximately 25mA ...
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... Select a bulk capacitor with a ripple current rating which will minimize the total number of input capacitors required to 28 ISL6326B support the RMS current calculated. The voltage rating of the capacitors should also be at least 1.25 times greater than the maximum input voltage. ...
Page 29
... Long distances between input capacitors and MOSFET drains result in too much trace inductance and a reduction in capacitor performance. Locate the output capacitors between the inductors and the load, while keeping them in close proximity to the microprocessor socket. 29 ISL6326B 0.8 1 FN9286.0 ...
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... 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 30 ISL6326B L40.6x6 40 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VJJD-2 ISSUE C) ...