IRDC3055 1 rev. 1.0 06/10/02 www.irf.com specification data introduction iru3055 evaluation board user guide input/output connections the iru3055 is a 3-phase synchronous buck controller which provides high performance dc to dc converter for high current and low voltage applications, such as power supply for intel or amd processors. it can meet intel vrm 9.0 specifications. the iru3055 features on-board dac that programs the output voltage from 1.075v to 1.850v, loss-less short circuit protection, programmable switching frequency, soft-start, 3-phase on-board mosfet drivers and pgood function, etc. the evalua- tion board is designed to provide 60a load at 1.5v out- put. the output voltage droop function is also included to meet the intel specification. (see the iru3055 data sheet for detailed description). v in =12v v out =1.5v @ (d4=0 and d0=0) i out =60a switching frequency fs=150khz the following is the input/output connections: inputs: jp1: power input, +12v,+5v and gnd jp2: power input, +in and return jp3: 20-pin atx connector jp4: jumper. the power input of converter. it can be con- figured at +5v or +12v. default is +12v input. jp7: dac input setting. '0' is set by using a 2-pin short connector. default setting is '1' for each input. default setting is 1.075v. to provide a 1.5v output, the pin "d4" and "d0" should be set to '1' by using 2-pin short con- nector. outputs: jp5: +v out output jp6: +gnd output jp8: pgood output jp9: 3.3v input and 1.2v vid and vidgood output jp10: tektronics probe test point instructions short circuit test the iru3055 provides hiccup mode current limit. it senses the r ds(on) of low side mosfet in channel 1 and provides lossless over current protection. it can be tested by shorting the output terminal to ground through a short piece of wire. v droop function in this demo-board, the voltage droop function is pro- vided by default. the output voltage decreases as load current increases. the output voltage versus load line falls into the specification by intel. the voltage droop function can be disabled by setting resistor r33 to zero or to short. in that case, the iru3055 regulates the output voltage to the set voltage by the dac setting. the output voltage does not linearly de- crease as load current increases.
IRDC3055 2 rev. 1.0 06/10/02 www.irf.com schematic figure 1 - shematic of iru3055 evaluation-board. {doc} {revcode} {title} b 1 1 monday, june 10, 2002 title size document number rev date: sheet of intel's recommendation decoupling per intel: 10pcs sanyo oscon capacitors, type 4sp560m (4v/560uf) 28 pcs 22uf mlc capacitors in 1210 package (murata or equivalent) 8pcs 1uf mlc. +vout rtn 5/28/2002 q1 q4,q7 iru3704 q3,q6,q9 iru3711s +input +input return return +12v return +5v return main input aux. voltages op op op +5v sd gnd pgood output voltage setting feedback to r24 note: op---open additional circuit connect the trace to the connector vout use one lm324 3.3v vid vgd nc c78 iru3055 demo board 1uf hdrv2 hdrv3 hdrv1 vds2 cs3 cs1 vds1 vfb comp ss bin vref +vout vch vin +12v cs2 vds3 +5v sd pgood ldrv2 ldrv1 ldrv3 d4 d3 d2 d1 d0 vd ocset +5v vref +5v vid ss +5v vidgood vref 3p3v vid vidgood r2 2 r12 2 r14 op r17 2 r20 op r5 op r3 2.2k c21 op r28 1.8k r13 op d1 bat54s 3 2 1 c16 0.1uf r18 27k c51 22nf c46 150p r16 op r23 op r24 0 jp3 atx connector 3.3v 1 3.3v 2 3.3v 3 -12v 4 gnd 5 gnd 6 +5v 7 on 8 gnd 9 gnd 10 +5v 11 gnd 12 gnd 13 gnd 14 pg 15 -5v 16 +5vsb +5v 18 +12v 19 +5v 20 r1 46.2k c17 0.1uf c8 1uf l2 1uh,1.6mohm r21 op c50 op c52 op c71 op r25 op c38 op c39 op c40 22 c41 22 c42 22 c43 22 c44 22 c45 22 c53 22 c54 22 c55 22 c56 22 c57 22 c58 22 c59 22 c60 22 c63 22 c64 22 c65 22 c66 22 c67 22 c68 22 c69 op c70 op c24 op c26 op c27 op c25 op + c20 2700uf + c6 2700uf + c5 2700uf + c7 op + c19 2700uf + c4 2700uf c31 op c34 op c32 op c33 op + c11 1500u + c15 2700uf + c14 2700uf + c13 op + c18 2700uf jp5 tb4 1 2 3 4 jp6 tb4 1 2 3 4 c12 1uf c23 1uf c36 1uf c62 1uf r27 op + c1 1500u r26 10 q1 1 3 2 q2 1 3 2 q5 1 3 2 q7 1 3 2 q8 1 3 2 jp2 tb4 1 2 3 4 jp4 input_sel 1 2 3 4 5 6 7 8 jp1 tb4 1 2 3 4 q3 1 3 2 r6 2 r29 1.8k c35 op q6 1 3 2 r15 2 r30 1.8k c61 op q9 1 3 2 r22 2 r4 op c22 op r19 op l3 1uh,1.6mohm l4 1uh,1.6mohm l1 1uh c30 1uf + c2 op c49 1uf r8 10k r7 10k + c48 1500u r11 10k + c10 1500u r9 10k c9 1uf r10 10k jp8 4 header 1 2 3 4 jp7 header 5x2 1 2 3 4 5 6 7 8 9 10 + c47 1500u c37 1uf c3 1uf r31 op r32 op + c29 1500u + c28 1500u q4 1 3 2 u1 iru3055_36pin vch3 21 vch12 31 vcc 8 vref 20 rt 1 ss 4 hdrv1 32 ldrv1 35 ocset 16 hdrv2 30 ldrv2 26 cs2 6 pgnd1 34 cs1 5 pgnd2 27 hdrv3 22 ldrv3 24 pgnd3 23 cs3 7 vfb 3 comp 2 d0 10 d1 11 d2 12 d3 13 d4 14 vcl1 36 vcl23 25 vset 9 fault 15 gnd 17 gnd 28 sd 18 pgood 19 ocgnd 33 r33 op r34 op c72 op d2 bat54 3 2 1 d3 bat54 3 2 1 d4 bat54 3 2 1 + - u2b lm324 5 6 7 4 11 r39 2.2k r40 2.2k r38 2.2k c74 1uf r41 3.24k r46 1.07k r37 1meg r50 1k r47 80k + - u2d lm324 12 13 14 4 11 r42 40k r48 60k c76 0.1uf + c77 10uf r49 10k r35 60.2k r36 10k + - u2a lm324 3 2 1 4 11 + - u2c lm324 10 9 8 4 11 r45 40k c75 0.47u r43 4.7k r44 4.7k jp9 4 header 1 2 3 4 c73 1uf q10 2n3904 3 1 2 q12 2n3904 3 1 2 q11 2n3904 3 1 2 1u
IRDC3055 3 rev. 1.0 06/10/02 www.irf.com parts list ref desig description value qty part# manuf web site (www.) 3 3 3 1 1 1 3 1 3 7 5 8 8 3 1 1 1 1 1 6 1 7 1 1 1 3 2 1 3 1 2 2 1 1 1 4 1 1 2 1 q1,q4,q7 q3,q6,q9 q10,11,12 u1 u2 d1 d2,d3,d4 l1 l2,l3,l4 c1,10,11, 28,29,47,48 c3,8,9, 30,49 c4,5,6,14, 15,18,19,20 c12,23,36, 37,62,73, 74,78 c16,17,76 c46 c51 c75 c77 r1 r2,6,12,15, 17,22 r3 r7,8,9,10, 11,36,49 r18 r24 r26 r28,29,30 r35,r48 r37 r38,39,40 r41 r42,r45 r43,r44 r46 r47 r50 jp1,2,5,6 jp3 jp7 jp8,jp9 jp10 mosfet mosfet transistor controller opamp schottky diode schottky diode inductor inductor cap,electrolytic cap, ceramic cap,electrolytic cap, ceramic cap, ceramic cap, ceramic cap, ceramic cap, ceramic capacitor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor terminal terminal terminal terminal scope probe connector irf3704s irf3711s iru3055 lm324,14-pin soic bat54s bat54a z9479-a t60-18 core, 6 turns #14 awg eeu-fj1c152 ecj-3yb1e105k eeu-fj0j222 ecj-2vf1c105z ecj-2vf1e104z ecu-v1h151jcg ecj-2vf1e223k ecj-2yb1c474k ecs-tojx156r ed1973-nd 147379 s201205-nd s1012-04-nd 131503100 ir ir ir 3m ir ir coilcraft panosonic panosonic panosonic panosonic panosonic panosonic panosonic panosonic panosonic digikey jameco digikey tektronix 20v, 9m ? 20v, 6m ? 2n3904 synchronous pwm 1.3 h, 10a 1 h, 20a 1500 f, 16v 1 f, x7r, 25v 2700 f, 6.3v, 13m ? 1 f, y5v, 16v 0.1 f, y5v, 25v 150pf, 50v, y5 22nf, y5v, 25v 0.47 f, x&r, 16v 15 f, tantalum 46.4k, 1% 2.15 ? , 5% 2.21k, 1% 10k, 1% 26.7k, 1% 0 ? 10 ? , 5% 1.8k, 1% 60.4k, 1% 1m, 1% 2.21k, 1% 3.24k 40.2k, 1% 4.64k, 5% 1.07k 80.6k, 1% 1k irf.com coilcraft.com maco.panasonic.co.jp
IRDC3055 4 rev. 1.0 06/10/02 www.irf.com connection diagram figure 2 - picture of iru3055 evaluation-board.
IRDC3055 5 rev. 1.0 06/10/02 www.irf.com the top side (component) layer for iru3055 eval board is shown in figure 3. the input capacitors are all located close to the mosfets. all the decoupling capacitors, charge pump capacitors and feedback components are located close to ic. the feedback pin v fb is connected to the output voltage at the output terminal. the pcb is a 4-layer board. one layer is dedicated to power gnd. the analog gnd is separated from the pgnd and is connected at a single point. layout figure 2 - top layer of evaluation-board for iru3048. figure 3 - top layer of iru3055 demo-board pcb layout.
IRDC3055 6 rev. 1.0 06/10/02 www.irf.com layout figure 4 - second layer of iru3055 demo-board pcb layout.
IRDC3055 7 rev. 1.0 06/10/02 www.irf.com figure 5 - third layer of iru3055 demo-board pcb layout. layout
IRDC3055 8 rev. 1.0 06/10/02 www.irf.com figure 7 - the bottom layer of iru3055 demo-board pcb layout. layout
IRDC3055 9 rev. 1.0 06/10/02 www.irf.com figure 8 - 3-phase inductor current at 60a load, ch1, ch2 and ch3: 10a/div. ch4: gate signal. figure 9 - soft-start, vcore and pgood. figure 10 - 60a dynamic load response with 20a/ s slew rate. ch3: output voltage, 100mv/div, ac. ch4: load current, 20a/us, sensed by 2m ? resistor, 25a/div. figure 11 - zoomed 60a load dynamic (rising). ch3: output voltage, 100mv/div, ac. ch4: load current, 20a/us, sensed by 2m ? resistor, 25a/div. figure 12 - 60a load dynamic waveforms with three-phase inductor current. ch1, ch2 and ch3: inductor current, 10a/div. ch4: load current, 20a/us, sensed by 2m ? resistor, 25a/div. test waveforms without active voltage droop (r33=0) figure 13 - 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 2m ? resistor, 25a/div. vss v core pgood
IRDC3055 10 rev. 1.0 06/10/02 www.irf.com ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information data and specifications subject to change without notice. 7/25/2002 figure 14 - soft-start. ch1: 1.2v vid. ch2: vid good. ch3: 1.5v output. ch4: pgood. figure 15 - 60a load dynamic with 20a/ s slew rate. ch4: output current, sensed through 2m ? resistor, 25a/div. ch3: ouput voltage, dc offset 1.3v, 100mv/div. test waveforms with active voltage droop (r33=open) figure 16 - 3-phase inductor current at 60a load, ch1, ch2 and ch3: 10a/div and gate signal.
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