IR3086AMTR International Rectifier, IR3086AMTR Datasheet
IR3086AMTR
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IR3086AMTR Summary of contents
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TM XPHASE PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT DESCRIPTION The IR3086A Phase IC combined with an IR XPhase to implement power solutions for the latest high performance CPUs and ASICs. The “Control” IC provides overall system control and ...
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... ORDERING INFORMATION Device IR3086AMTR * IR3086AM * Samples only ABSOLUTE MAXIMUM RATINGS Operating Junction Temperature……………..150 Storage Temperature Range………………….-65 ESD Rating………………………………………HBM Class 1C JEDEC standard ...
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ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over: 8.4V ≤ ≤ 14V, 5.9V ≤ V(BIASIN) ≤ 7.1V, 0.8V ≤ V(DACIN) ≤ 1.6V, and 0 CCL C = 6.8nF GATEL PARAMETER Gate Drivers GATEH Rise Time GATEH Fall ...
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PARAMETER Ramp Discharge Clamp Clamp Voltage Clamp Discharge Current PWM Comparator PWM Comparator Input Offset Voltage EAIN & PWMRMP Bias Current Clamp and Current Share Adjust OFF Propagation Delay VCCH = 12V. Measure time from Common Mode Input Range Exceeding ...
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PARAMETER General VCC Supply Current VCCL Supply Current VCCH Supply Current BIASIN Bias Current DACIN Bias Current Note 1: Guaranteed by design, but not tested in production PIN DESCRIPTION PIN# PIN SYMBOL PIN DESCRIPTION 1 RMPIN+ Non-inverting input to Ramp ...
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SYSTEM THEORY OF OPERATION TM Architecture XPhase TM The XPhase architecture is designed for multiphase interleaved buck converters which are used in applications requiring small size, design flexibility, low voltage, high current and fast transient response. The architecture can control ...
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PWM Control Method The PWM block diagram of the XPhase trailing edge modulation is used. A high-gain wide-bandwidth voltage type error amplifier in the Control IC is used for the voltage control loop. An external RC circuit connected to the ...
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VPEAK (5.0V) VPHASE4&5 (4.5V) VPHASE3&6 (3.5V) VPHASE2&7 (2.5V) VPHASE1&8 (1.5V) VVALLEY (1.00V) PWM Operation The PWM comparator is located in the Phase IC. Upon receiving a clock pulse, the PWM latch is set; the PWMRMP voltage begins to increase; the ...
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PHASE IC CLOCK PULSE EAIN PWMRMP VDAC GATEH GATEL STEADY-STATE OPERATION TM Body Braking In a conventional synchronous buck converter, the minimum time required to reduce the current in the inductor in response to a load step decrease is; The ...
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Figure 5. Inductor Current Sensing and Current Sense Amplifier The advantage of sensing the inductor current versus high side or low side sensing is that actual output current being delivered to the load is obtained rather than peak or sampled ...
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IR3086A THEORY OF OPERATION Block Diagram The Block diagram of the IR3086A is shown in Fig. 6, and specific features are discussed in the following sections. RAMP COMPARATOR RMPIN+ CLOCK + PULSE RMPIN- - GENERATOR EAIN SYSTEM BIASIN BIASIN REFERENCE ...
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When designing for OVP the overall system must be considered. In many cases the over-current protection of the AC-DC or DC-DC converter supplying the multiphase converter will be triggered thus providing effective protection without damage as long as all PCB ...
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APPLICATION INFORMATION 12V RVCC 10 ohm RGATE CVCC 0.1uF 0.1uF ENABLE 1 21 OSCDS VBIAS VID5 2 20 VID5 BBFB VID0 3 19 IR3081A VID0 EAOUT VID1 4 18 CONTROL VID1 FB VID2 VID2 VDRP VID3 6 ...
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DESIGN PROCEDURES – IR3081A AND IR3086A CHIPSET IR3081A EXTERNAL COMPONENTS Oscillator Resistor Rosc The oscillator of IR3081A generates a triangle waveform to synchronize the phase ICs, and the switching frequency of the each phase converter equals the oscillator frequency, which ...
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Over Current Setting Resistor R The inductor DC resistance is utilized to sense the inductor current. The copper wire of inductor has a constant temperature coefficient of 3850 ppm/°C, and therefore the maximum inductor DCR can be calculated from Equation ...
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IR3086A EXTERNAL COMPONENTS PWM Ramp Resistor R and Capacitor C PWMRMP PWM ramp is generated by connecting the resistor R as the capacitor C between PWMRMP and LGND. Choose the desired PWM ramp magnitude V PWMRMP the capacitor C in ...
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Phase Delay Timing Resistors R The phase delay of the interleaved multiphase converter is programmed by the resistor divider connected at RMPIN+ or RMPIN- depending on which slope of the oscillator ramp is used for the phase delay programming of ...
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VOLTAGE LOOP COMPENSATION The adaptive voltage positioning (AVP) is usually adopted in the computer applications to improve the transient response and reduce the power loss at heavy load. Like current mode control, the adaptive voltage positioning loop introduces extra zero ...
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A tan Choose the desired crossover frequency fc around fc1 estimated by Equation (27) or choose fc between 1/10 and 1/5 of the switching frequency per phase, and select the components to ensure the ...
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CURRENT SHARE LOOP COMPENSATION The crossover frequency of the current share loop should be at least one decade lower than that of the voltage loop in order to eliminate the interaction between the two loops. A capacitor from SCOMP to ...
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DESIGN EXAMPLE 1 - VRM 10 2U CONVERTER SPECIFICATIONS Input Voltage DAC Voltage: V =1.35 V DAC No Load Output Voltage Offset: V Output Current: I =105 ADC O Maximum Output Current: I =120 ADC OMAX ...
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VDAC Slew Rate Programming Capacitor C From Figure 15 of IR3081A Data Sheet, the sink current of VDAC pin corresponding to 400kHz (R 76uA. Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate. ...
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TM Body Braking Related Resistors R N/A. The body braking during Dynamic VID is disabled. IR3081A EXTERNAL COMPONENTS PWM Ramp Resistor R and Capacitor C PWMRMP Set PWM ramp magnitude V PWMRMP resistor R , PWMRMP R PWMRMP ...
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Bootstrap Capacitor C BST Choose C =0.1uF BST Decoupling Capacitors for Phase IC and Power Stage Choose C =0.1uF, C =0.1uF VCC VCCL VOLTAGE LOOP COMPENSATION Type II compensation is used for the converter with AL-Polymer output capacitors. Choose the ...
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DESIGN EXAMPLE 2 - EVRD 10 HIGH FREQUENCY ALL-CERAMIC CONVERTER SPECIFICATIONS Input Voltage DAC Voltage: V =1.3 V DAC No Load Output Voltage Offset: V Output Current: I =105 ADC O Maximum Output Current: I =120 ...
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I 170 * 10 SINK C VDAC DOWN Calculate the programming resistor. ...
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IR3086A EXTERNAL COMPONENTS PWM Ramp Resistor R and Capacitor C PWMRMP Set PWM ramp magnitude V PWMRMP resistor R , PWMRMP R PWMRMP [ln PWMRMP ...
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R =10kΩ, R =768Ω, R PHASE41 PHASE42 Bootstrap Capacitor C BST Choose C =0.1uF BST Decoupling Capacitors for Phase IC and Power Stage Choose C =0.1uF, C =0.1uF VCC VCCL VOLTAGE LOOP COMPENSATION Type III compensation is used for the ...
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LAYOUT GUIDELINES The following layout guidelines are recommended to reduce the parasitic inductance and resistance of the PCB layout, therefore minimizing the noise coupled to the IC. Dedicate at least one middle layer for a ground plane, which is ...
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PCB Metal and Component Placement Lead land width should be equal to nominal part lead width. The minimum lead to lead spacing should be ≥ 0.2mm to minimize shorting. Lead land length should be equal to maximum part ...
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Solder Resist The solder resist should be pulled away from the metal lead lands and center pad by a minimum of 0.06mm. The solder resist mis-alignment is a maximum of 0.05mm and it is recommended that the lead lands ...
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Stencil Design The stencil apertures for the lead lands should be approximately 80% of the area of the lead lands. Reducing the amount of solder deposited will minimize the occurrence of lead shorts. Since for 0.5mm pitch devices the ...
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PACKAGE INFORMATION 20L MLPQ ( Body) – θ IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 Visit us at www.irf.com for sales contact information. Page ...