IR3082A International Rectifier Corp., IR3082A Datasheet

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IR3082A

Manufacturer Part Number
IR3082A
Description
9.6v Amd Xphasetm Control Ic
Manufacturer
International Rectifier Corp.
Datasheet
DESCRIPTION
FEATURES
APPLICATION CIRCUIT
POWERGOOD
The IR3082A Control IC combined with an IR XPhase
to implement a power solution. The “Control” IC provides overall system control and interfaces with any
number of “Phase ICs” which each drive and monitor a single phase of a multiphase converter. With
simple 5 bit voltage programming and a few external components, the IR3082A is also well suited for
general purpose multiphase applications. The XPhase
smaller, less expensive, and easier to design while providing higher efficiency than conventional
approaches.
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Page 1 of 33
ENABLE
VID0
VID1
VID2
VID3
VID4
5 bit VID with 1% overall system set point accuracy
Programmable Dynamic VID Slew Rate
+/-300mV Differential Remote Sense
Programmable 150kHz to 1MHz oscillator
Programmable VID Offset and Load Line output impedance
Programmable Softstart
Programmable Hiccup Over-Current Protection with Delay to prevent false triggering
Simplified Power Good output provides indication of proper operation and avoids false triggering
Operates from 12V input with 8.25V Under-Voltage Lockout
6.3V/1mA Bias Regulator provides System Reference Voltage
Small thermally enhanced 20L MLPQ package
12V
1
2
3
4
5
VID0
VID1
VID2
VID3
VID4
RVCC1
10 ohm
IR3082A
CONTROL
IC
ROSC
CVCC1
0.1uF
ROCSET
RVDAC
CVDAC
EAOUT
VBIAS
VDRP
VCC
FB
15
14
13
12
11
RDRP1
0.1uF
RDRP
CFB
RFB1
CDRP
TM
9.6V AMD XPHASE
TM
Phase IC provides a full featured and flexible way
RFB
architecture results in a power supply that is
RCP
CCP1
CCP
RMPOUT
VBIAS
EA
ISHARE
VDAC
VOSENSE+
VOSENSE-
TM
5 Wire Analog Bus
to Phase ICs
Remote Sense
05/02/2006
DATA SHEET
CONTROL IC
IR3082A

Related parts for IR3082A

IR3082A Summary of contents

Page 1

... The “Control” IC provides overall system control and interfaces with any number of “Phase ICs” which each drive and monitor a single phase of a multiphase converter. With simple 5 bit voltage programming and a few external components, the IR3082A is also well suited for general purpose multiphase applications. The XPhase smaller, less expensive, and easier to design while providing higher efficiency than conventional approaches ...

Page 2

... ORDERING INFORAMATION Device IR3082AMTRPbF * IR3082AMPbF * Samples only ABSOLUTE MAXIMUM RATINGS Stresses beyond those listed below may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. ...

Page 3

... Note 1 Note 1 45 deg Phase Shift, Note 1 Note 1 VBIAS–VEAOUT (referenced to VBIAS) Normal operation or Fault mode V(VDRP) – V(IIN Note 1 Note 1 I(VBIAS) 1mA ENABLE rising ENABLE falling 0V IR3082A MIN TYP MAX UNIT - 109 119 PA 90 101 108 1.04 1.22 1 ...

Page 4

... Hysteresis Start – Stop General VCC Supply Current VOSNS- Current -0.3V Note 1: Guaranteed by design, but not tested in production Note 2: VDAC Output is trimmed to compensate for Error Amp input offsets errors Page TEST CONDITION VOSNS- 0.3V, All VID Codes IR3082A MIN TYP MAX UNIT 1.2 1.9 2.6 ms 0.85 1.95 3 ...

Page 5

... Page EAOUT - ERROR FB AMP RFB OCSET + ISOURCE VDAC ISINK - VDAC BUFFER IOFFSET IOCSET IROSC IROSC RVDAC AMP ROSC CVDAC BUFFER CURRENT AMP + SOURCE GENERATOR - ROSC + ROSC 1.2V - VOSNS- Figure 1 – System Set Point Test Circuit IR3082A SYSTEM SET POINT VOLTAGE 05/02/2006 ...

Page 6

... IR3086A PHASE 0.1uF IC PHASE HOT CCS RCS PHASE FAULT IR3086A CURRENT SHARE PHASE 0.1uF IC PHASE HOT CCS RCS ADDITIONAL PHASES Figure 2 – System Block Diagram IR3082A POWER GOOD PHASE FAULT VR HOT CIN VOUT SENSE+ VOUT+ COUT VOUT- VOUT SENSE- INPUT/OUTPUT 05/02/2006 ...

Page 7

... RPHS2 PWMRMP RAMP RPWMRMP SLOPE ADJUST RAMP DISCHARGE CPWMRMP SCOMP CLAMP SHARE CSCOMP ADJUST ERROR AMP + ISHARE 20mV 10K - DACIN Figure 3 – IR3082A PWM Block Diagram IR3082A PHASE IC PWM LATCH GATEH S PWM RESET COMPARATOR DOMINANT - R GATEL + ENABLE + BODY - BRAKING COMPARATOR X 0.9 CURRENT ...

Page 8

... An additional advantage is that differences in ground or input voltage at the phases have no effect on operation since the PWM ramps are referenced to VDAC. Page 50% RAMP DUTY CYCLE SLOPE = 80mV / % DC SLOPE = 1.6mV / ns @ 200kHz SLOPE = 8.0mV / ns @ 1MHz Figure 4 – 8 Phase Oscillator Waveforms IR3082A 05/02/2006 ...

Page 9

... Figure 5 – PWM Operating Waveforms  IR3082A DUTY CYCLE DECREASE DUE TO LOAD STEADY-STATE DECREASE (BODY BRAKING) OR FAULT OPERATION (VCC UV, OCP, VID=11111 the two time constants match, the L 05/02/2006 BODY ...

Page 10

... PWM ramp thereby increasing its duty cycle and output current. The crossover frequency of the current share loop can be programmed with a capacitor at the SCOMP pin so that the share loop does not interact with the output voltage loop. Page Rcs Ccs CSOUT + IR3082A Co 05/02/2006 ...

Page 11

... Vout listed in Table1 for load positioning. The actual VDAC voltage does not determine the system accuracy and has a wider tolerance. The IR3082A can accept changes in the VID code while operating and vary the DAC voltage accordingly. The sink/source capability of the VDAC buffer amp is programmed by the same external resistor that sets the oscillator frequency ...

Page 12

... Note: 4 Output disabled (Fault mode) Table 1 – VID Table is selected to program the desired amount of fixed offset voltage below the FB IR3082A Vout (V) 1.550 1.525 1.500 1.475 1.450 1.425 1.400 1.375 1.350 1.325 1.300 1.275 1.250 1.225 1 ...

Page 13

... VDAC VDAC Figure 8 - Adaptive voltage positioning Control IC Error Amplifier VDAC drp Droop Amplifier VDRP - IIN + IR3082A , and makes the output voltage lower FB so that the droop VDRP Current Sense Amplifier CS+ + CS- - Current Sense Amplifier CS 05/02/2006 . ...

Page 14

... The UVLO function monitors the IR3082A’s VCC supply pin and ensures that IR3082A has a high enough voltage to power the internal circuit. The IR3082A’s UVLO is set higher than the minimum operating voltage of compatible Phase ICs thus providing UVLO protection for them as well. During power-up the fault latch is reset when VCC exceeds 8 ...

Page 15

... VDAC voltage from the IIN voltage. System Reference Voltage (VBIAS) The IR3082A supplies a 6.3V/1mA precision reference voltage from the VBIAS pin. The oscillator ramp trip points are based on the VBIAS voltage so it should be used to program the Phase ICs phase delay to minimize phase errors ...

Page 16

... CHANGES DUE TO FAULT MODE) LOAD AND VID CHANGES) Page SOFT START TIME 1.95ms Figure 10 – Start-up Waveforms 3.79V OCP HICCUP OVER-CURRENT DELAY PROTECTION Figure 11 – Operating Waveforms IR3082A 9.0V UVLO PWRGD NORMAL POWER-DOWN DELAY OPERATION (VCC UVL 2.0ms INITIATES FAULT MODE) 9.0V ...

Page 17

... CONTROL 13 VID2 EAOUT VID3 CCP1 VID3 FB VID4 5 11 VID4 VDRP RDRP ROCSET ROSC RVDAC CVDAC Figure 12 – IR3082A/3086A 5 Phase Converter for Opteron Processor Page RBIASIN 20k DGATE 1 RMPIN+ 2 IR3086A RMPIN- 3 PHASE HOTSET 4 IC VRHOT 5 ISHARE CFB RFB1 RFB CSCOMP ...

Page 18

... Figure 16 - Bias Current Accuracy vs. ROSC 5 Isource 4.5 Isink 4 3.5 3 2.5 2 1 Gain Phase 1M 10M 100M IR3082A Figure 14 IFB, IOCSET vs. ROSC ROSC (KOhm OCS ias Current VDAC S ink Current VDAC S ource Current ROSC (KOhm) 05/02/2006 ...

Page 19

... DESIGN PROCEDURES – IR3082A AND IR3086A CHIPSET IR3082A EXTERNAL COMPONENTS Oscillator Resistor Rosc The oscillator of IR3082A generates a triangle waveform to synchronize the phase ICs, and the switching frequency of the each phase converter equals the oscillator frequency, which is set by the external resistor R the curve in Figure 13. ...

Page 20

... MAX TOFST CS _ MIN ˜ ˜ ˜ IR3082A as defined in VDAC VDAC is proportional UP is the source current of VDAC pin as (7) (8) (9) and room temperature L_MAX (10) (11) (12) is the required LIMIT (13) OCSET (14) 05/02/2006 is used to OSC ...

Page 21

... IN DAC and Resistors R and R CS+ CS+ . Pre-select the capacitor C L should be added between the amplifier inverting CS- is determined by the ratio of the bias current from the non-inverting CS- IR3082A DRP which is the O_NLOFST, are determined by (15) and (16) DRP (15) ( 16) RAMP from Equation PWMRMP should be connected to the input of the ...

Page 22

... R PHASE2 , corresponding to the desired switching frequencies and phase numbers determined as: PHASEx2 R PHASEx 1 PHASEx corresponding to the allowed maximum temperature from HOTSET PHASEx1 then calculate R PHASEx1, IR3082A should be less CS+ (ºC) of phase IC. Determine J (20) (21) (22) R and R PHASE1, PHASE2 PHASE3 and R and connect HOTSET pin ...

Page 23

... RMPIN+ or RMPIN- between R PHASEx2 , PHASEx1 ˜ ˜ PHASEx BIAS PHASEx BIAS HOTSET ˜ BIAS PHASEx HOTSET CCP1 RFB1 CCP (b) Type III compensation IR3082A (23) (24) PHASEx2 (25) (26) CCP1 CFB RCP CCP RFB RDRP 05/02/2006 , PHASEx and ...

Page 24

... ROOM LE CI ˜ ˜ ˜ ˜ ˜ ˜ PWMRMP SW PWMRMP  ˜ DAC I DAC IR3082A (27) (28) CP1 (29) (30) (31) (32) ) based on the crossover CI ˜ ˜ (33) (34) 05/02/2006 is optional E ...

Page 25

... SW Output Inductors: L=220 nH, R =0. Output Capacitors: C=47uF IR3082A EXTERNAL COMPONENTS Oscillator Resistor Rosc Once the switching frequency is chosen, R frequency of 600kHz per phase, choose R Soft Start Capacitor C SS/DEL Calculate the soft start capacitor from the required soft start time. ˜ ...

Page 26

... O ˜ ˜ ˜ ˜ ˜ IR3082A  : ˜ 101 65uA with OCSET 6mV, which includes the offset created by ˜ 147 DRP ˜ ˜ ˜ ˜ ...

Page 27

... Resistors R and R CS+ CS+ CS choose R =7.15k . CS- and R HOTSET1 HOTSET2 ˜ ˜ choose R 10 116 . 1 241 . HOTSET1 . and R PHASE2 646 ˜ ˜ 646 =8.2 =25.5 PHASE42 PHASE52 IR3082A , and calculate the PWMRMP =18.2k PWMRMP CS- =20.0k 05/02/2006 ...

Page 28

... 1504 10  ˜ ˜ ˜ ˜ ˜ ˜ 100 IR3082A : CP ˜ ˜ 230 =33nF CP and calculate SCOMP . 0 011 ˜  ˜ ˜ ˜ 100 100 ] ...

Page 29

... Control bus signals, VDAC, RMPOUT, IIN, VBIAS, and especially EAOUT, should not cross over the fast transition nodes. Page OCSET VDAC VDAC VCC SS/DEL IR3082A and R . Avoid using any via for the CC/DEL 05/02/2006 ...

Page 30

... The single via in the land pad should be tented with solder resist 0.4mm diameter, or 0.1mm larger than the diameter of the via. Page IR3082A due to the high 05/02/2006 ...

Page 31

... Center pad land length and width should be equal to maximum part pad length and width. However, the minimum metal to metal spacing should be 0.23mm for 3 oz. Copper single 0.30mm diameter via shall be placed in the center of the pad land and connected to ground to minimize the noise effect on the IC. Page for 2 oz. Copper ( IR3082A and 05/02/2006 ...

Page 32

... The maximum length and width of the land pad stencil aperture should be equal to the solder resist opening minus an annular 0.2mm pull back to decrease the incidence of shorting the center land to the lead lands when the part is pushed into the solder paste. Page IR3082A 05/02/2006 ...

Page 33

... Data and specifications subject to change without notice. This product has been designed and qualified for the Consumer market. Qualification Standards can be found on IR’s Web site. Visit us at www.irf.com for sales contact information. IR3082A IDENTIFIER TAC Fax: (310) 252-7903 05/02/2006 ...

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