iru3055 International Rectifier Corp., iru3055 Datasheet
iru3055
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iru3055 Summary of contents
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... The IRU3055 is a 3-phase synchronous Buck controller which provides high performance converter for high current applications. The IRU3055 controller IC is specifically designed to meet Intel and AMD specifications for the new microproces- sor requiring low voltage and high current. The IRU3055 features under-voltage lockout for both 5V ...
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... IRU3055 ABSOLUTE MAXIMUM RATINGS V and V Supply Voltage ................................... CH12 CH3 V and V Supply Voltage ................................... CL1 CL23 V Supply Voltage .................................................. 7V CC Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... PACKAGE INFORMATION 36-PIN WIDE BODY PLASTIC QSOP ( Comp 2 35 LDrv1 PGnd1 ...
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... TF C Low Side=6000pF High Side=3000pF Low Side=6000pF (Both Measured @ 10 50KV OSC V Peak to Peak OSC LDrv or HDrv MATCH www.irf.com IRU3055 MIN TYP MAX UNITS 0.88Vs 0.90Vs 0.92Vs V 0.89Vs 0.91Vs 0.93Vs V 0.001Vs 0.01Vs 0.02Vs V 1.10Vs 1.11Vs 1.12Vs V 1.09Vs 1.10Vs 1 ...
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... IRU3055 Table 1 - Set point voltage (Vs) vs. VID codes. ...
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... NC No connection. 33 OCGnd This pin is connected from the source of the synchronous MOSFET in channal 1 of the Core supply and it provides the reference point for the internal current sensing circuitry. Rev. 1.4 08/13/02 to PGnd1, 2 and 3 for noise free operation. www.irf.com IRU3055 of the DS(ON and CL1 CL23 5 ...
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... PGood 19 P3 Duty Cycle Adj Ref 20 2V Reference Gnd 17 Gnd Shut Down 18 SD Figure 2 - Simplified block diagram of the IRU3055. 6 10uA Master Error Amp P1 PWM Comp P1 Ramp P1 PWM Latch P1 Set P1 Ramp P2 Set 3-Phase Oscillator P2 Ramp P3 Set P3 Ramp P2 PWM Comp P2 Ramp ...
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... IRF3704S R1 OCSet 2.2K Q2 LDrv1 IRF3711S PGnd1/ OCGnd CS1 Q3 HDrv2 IRF3704S Q4 LDrv2 IRF3711S PGnd2 CS2 Q5 HDrv3 IRF3704S Q6 LDrv3 IRF3711S PGnd3 CS3 Fb Figure 3 - Typical application of IRU3055. Value Qty Part# 3 IRF3704S 3 IRF3711S 1 IRU3055 1 BAT54S 1 Z9479-A 3 T60-18 Core, 6-turns #14 AWG wire 1 ECJ-3YB1E105K 2 ECJ-2VF1E104Z 6 ECJ-3VF1C105Z 1 6 EEU-FJ1C152U 1 ...
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... Another benefit will be faster dynamic load responses. The block diagram of IRU3055 is shown in Figure 2. The 3-phase oscillator provides a constant frequency and the three PWMs ramp signals with 120 degree phase shift. ...
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... order to minimize the effect of the bias current in IRU3055, the sensing resistor should be as small as possible. However, a small resistor will result in high power dissipation and a high value capacitor, a trade off has to be chosen. Typically, a 1mF ceramic capacitor is a good start. In the Application Circuit (1), L=1mH and R =1 ...
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... In the meantime, the PGood pin is held to low. Soft-Start ---(3) The IRU3055 has a soft-start function to limit the current surge at the start-up. An external capacitor which is charged by a 10mA internal current source is used to program the soft-start timing. The voltage of the external ...
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... For IRU3055, the 3-phase synchro- nous rectifier MOSFET drivers are built inside. To drive the high-side MOSFET necessary to supply a gate voltage at least 4V greater than the bus voltage. In IRU3055, the driver supply voltage for high side MOSFET driver is supplied through the V and V CH12 ...
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... IRU3055 Power MOSFET Selection The IRU3055 is a controller for 3-phase synchronous buck converter. For each phase, the average inductor current will be one third of the total output current in an ideal case, which will greatly alleviate the thermal man- agement for power switch. In general, the MOSFET se- ...
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... MOSFET and source of the low side switch to suppress the voltage spike caused by parasitic circuit parameters. For high current applications, a 1mH input inductor is recommended to slow down the input current transient. www.irf.com IRU3055 Single- Phase Two- Phase Three- Phase 0 ...
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... IRU3055 Design Example In the demo-board, the condition is as follows: V =12V, V =1.5V and I IN OUT OUT Output voltage regulation is within 100mV during tran- sient. (1) Select Switching Frequency Fs = 150KHz for each phase According to Figure 10 and equation (5), the oscilla- tor selection resistor is given by: Rt 7500/150 = 50K ...
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... SS CH12 CH3 pin. (8) Place a frequency selection resistor (Rt) close to Rt pin. (9) Connect output inductor current sensing network such as R2, C8 close to IRU3055. One example of the layout is shown as follows: CS1 IRU3055 CS2 CS3 Fb Close to IRU3055 Figure example of layout connection for inductor current sensing ...
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... IRU3055 Component Connection • No data bus should be passing through the switching regulator especially close to the fast transition nodes such as PWM drivers or the inductor voltage. • If possible, using four layer board, dedicate one layer to ground, another layer as power layer for the constant power input and output such as 5V, 12V, and 1 ...
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... Ch1, Ch2 and Ch3: Inductor current, 10A/div. Ch4: Load current, 20A/us, sensed by 2mV resistor, 25A/div. Figure 19 - 60A load dynamic waveforms with three-phase inductor current. (Zoomed) Ch1, Ch2 and Ch3: Inductor current, 10A/div. Ch4: Load current, 20A/us, sensed by 2mV resistor, 25A/div. www.irf.com IRU3055 17 ...
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... R14 1/4 LM324 10K 40K C16 0.47uF R19 40K U2A Q7 R20 C18 1/4 LM324 2N3904 60K 47nF Figure 20 - Application circuit of IRU3055 to implement active voltage droop as well as the 1.2V VID voltage with VccVID Power Good 1uF C2 0.1uF VCL1 Vcc VCL23 HDrv1 R1 OCSet1 2.2K Ref LDrv1 ...
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... LM324 1 ECJ-2YB1C105K 1 ECJ-2YB1C474K 1 ECJ-2VF1E104Z 1 ECJ-2VF1E473K www.irf.com IRU3055 Manuf Web site (www.) IR irf.com Coilcraft coilcraft.com Panosonic maco.panasonic.co.jp Panosonic Panosonic Any Panosonic maco.panasonic.co.jp Panosonic Panosonic Panosonic Any Any Any Any Any Any Panosonic maco.panasonic.co.jp ...
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... K = 98mV/45A = 2.18mV LOAD Implementation of Voltage Droop with IRU3055 With a single single-ended OPAMP, the IRU3055 can achieve voltage droop function as shown in Figure 22. The voltage constant voltage such 5V. The signal Vo+Rs3Io can be from inductor current sens- ing. The real application circuit is shown in Figure 20. ...
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... C16=0.47mF, which gives about 5ms delay for a better illustration. When the voltage across capacitor C16 reaches 1V, the OPAMP will turn off the two NPN transistors. The soft-start capacitor of IRU3055, C10, starts to be charged up and output volt- age, Vo, will smoothly go into steady state www ...
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... IRU3055 EXPERIMENT WAVEFORMS FOR TYPICAL APPLICATION (2) Figure 25 - 60A Load dynamic with 20A/ms slew rate. Ch4: Output current, sensed through 2mV resistor, 25A/div. Ch3: Ouput voltage, DC offset 1.3V, 100mV/div. 22 Figure 24 - Soft-start. Ch1: 1.2V VID. Ch2: VID Good. Ch3: 1.5V Output. Ch4: PGood. Figure 26 - 3-Phase inductor current at 60A load, Ch1, Ch2 and Ch3: 10A/div and gate signal ...
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... IRU3055 C10 1uF 47K 0.1uF C12 Comp 22nF 20K Figure 26 - Typical application of IRU3055 in notebook application. Rev. 1.4 08/13/ C15 C 1 1uF 1uF 1uF 1uF V CL1 V CL23 Q1 HDrv1 IRF3704S D2 1N4148 ...
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... Resistor 47K Resistor 20K Resistor 10V WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 24 Value Qty Part# 3 IRF3704S 3 IRF3711S 1 2N3904 1 IRU3055 1 BAT54S 1 1N4148 1 1N5242A 1 Z9479-A 3 T60-18 Core, 6-turns #14 AWG wire 1 ECJ-3YB1E105K 2 ECJ-2VF1E104Z 7 ECJ-3VF1C105Z 1 6 EEU-FJ1C152U ...
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... QSOP Package, Wide Body NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. Rev. 1.4 08/13/02 36-Pin D E DETAIL 0.50 0. 36-PIN SYMBOL MIN MAX A 15.20 15.40 0.85 B 0.80 REF B1 C 0.28 0.51 D 7.40 7.60 E 10.11 10.51 F 2.44 2.64 G 0.10 0.30 78 TYP H J 0.23 0. 0.40 1.27 R 0.63 0.89 R1 0.2060.05 P 78638 www.irf.com IRU3055 DETAIL ...
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... IRU3055 PACKAGE SHIPMENT METHOD PKG PACKAGE DESIG DESCRIPTION Q QSOP Plastic, Wide Body IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 26 PIN PARTS COUNT PER TUBE 36 --- Feed Direction Figure A Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice ...