IRDC3046 1 rev. 1.0 05/22/02 www.irf.com specification data introduction iru3046 evaluation board user guide input/output connections the iru3046 ic combines a dual synchronous pwm controller and a linear regulator controller, providing a cost-effective, high performance and flexible solution for multi-output applications. the dual synchronous control- ler can be configured as 2-independent or 2-phase con- troller. in 2-phase configuration, the iru3046 provides programmable current sharing which is ideal when the output power exceeds any single input power budget. iru3046 provides a separate adjustable output by driv- ing a switch as a liner regulator. the eval board is de- signed for current sharing mode (see the iru3046 data sheet for detail description), the two pwm controllers provide one single output and the linear regulator pro- vides the second output. switcher: v in1(master) = 5v v in2 (slave) = 12v v out = 1.5v i out = 16a v out = 75mv fs = 200khz linear regulator: ldo in = 3.3v ldo out = 2.5v i out = 2a the following is the input/output connections: inputs: jp1: +5v and gnd. jp2: +12v and gnd. jp5: ldoin (3.3v) and gnd. alternative connections: jp3: atx connector for 3.3v, 5v and 12v inputs and gnd. outputs: jp4: +vout (1.5v) and gnd. jp6: +ldoout (2.5v) and gnd. the connection points is shown in figure 1. connect the power supply cables according to this figure, minimize wire lengths to reduce losses in the wire. test point j1, j2 and j3 provide easy connection for oscilloscope volt- age probe to monitor the inductor points for each pwm section and output voltage.
IRDC3046 2 rev. 1.0 05/22/02 www.irf.com figure 1 - connection diagram of evaluation-board for iru3046. connection diagram power supply 6a supply gnd +3.3v gnd +5v gnd +12v 6a supply load 0 - 16a load 0 - 2a
IRDC3046 3 rev. 1.0 05/22/02 www.irf.com the top side (component) layer for iru3046 eval board is shown in figure 2. the input capacitors are all located close to the mosfets. all the decoupling capacitors, charge pump capacitor and feedback components are located close to ic. the two current sense resistor lo- cated close to inductors and they are located symmetri- cal to the output. the feedback resistors are tied to the output voltage at the point of regulation. the pcb is 4-layers board, one layer is dedicated to power gnd and the analog gnd is kept separated from the pgnd and it is connected at a single point. layout figure 2 - top layer of evaluation-board for iru3046.
IRDC3046 4 rev. 1.0 05/22/02 www.irf.com schematic figure 3 - schematic of evaluation-board for iru3046. iru3046eval iru3046eval 11 title size document number rev date: sheet of 12v 5v atxon- +5v +12v gnd ldo in ldo out pgd gnd sync gnd gnd gnd +vo u gn d d5v vd s2 d12v comp1 rt fb1 fb2 hdrv 1 ldrv 1 hdrv 2 vc3 ldrv 2 fb3 ldoout +3.3v +5v pgood pgood comp2 +12v vd s1 ss sy nc q5 irf7457 8 7 5 6 1 2 3 4 c27 open c28 open + c1 33uf,16v,tantalum + c2 33uf, 16v, tantalum c24 2200pf q1 irf7460 8 7 5 6 1 2 3 4 c16 open l4 3.3uh r3 5m ohm s, 1w , 1% + c10 150uf, 6.3v, 40mohm, posc ap r9 open l3 2.2uh q4 irf7460 8 7 5 6 1 2 3 4 c15 1uf r12 1.00k, 1% r8 200ohm,1% c3 0.1uf + c11 + c12 + c19 + c20 + c21 150uf,6.3v, 40mohm , poscap c 26 470pf c 14 470pf r5 4.7ohm d4 bat54a 3 1 2 + c4 47uf,16v, posc ap + c5 330uf, 6.3v, posc ap c9 1uf,25v r18 2.15 ohm r15 2.15ohm r4 2.15ohm r7 1.00k, 1% r2 2.15ohm r10 1.00k,1% c29 0.1uf r19 4.7ohm + c13 47uf, tantalum + c18 47uf, tantalum r20 open r6 10 ohm c17 open c8 1uf c7 1uf jp4 tb4 1 2 3 4 jp3 atx c onn ec tor 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 jp2 tb2 1 2 r1 0ohm c6 1uf c23 1uf r17 5mohm, 1w , 1% d5 open 1 2 d3 open 1 2 q3 irlr2703 1 3 2 c30 1uf r11 open r13 15k d2 bat54a 3 1 2 jp1 tb2 1 2 jp5 tb2 1 2 jp6 tb2 1 2 c22 open c34 6800pf + c31 330uf, 6.3v, posc ap + c32 47uf, 16v, poscap c33 open d1 bat54s 3 2 1 r16 29.4k q2 irf7457 8 7 5 6 1 2 3 4 r21 16.5k l1 1uh l2 1uh jp7 tb3 1 2 3 u1 iru3046cf hdrv 1 15 ldrv 1 14 pgnd 12 vref 1 vp2 2 fb1 21 fb2 3 hdrv 2 10 ldrv 2 11 gnd 24 vch2 9 vch1 16 vcl 13 vcc 4 vccldo 17 vssns33 22 vout3 18 fb3 19 rt 7 sy nc 8 comp1 5 comp2 6 pgood 23 ss 20 j2 tp 1 2 3 4 5 j1 tp 1 2 3 4 5 j3 tp 1 2 3 4 5
IRDC3046 5 rev. 1.0 05/22/02 www.irf.com ref desig description value qty part# manuf web site (www.) 2 2 1 1 1 2 2 1 1 2 2 2 6 2 1 1 1 2 6 2 4 1 1 2 1 3 2 1 1 3 1 6 2 q1,q4 q2,q5 q3 u1 d1 d2,d4 l1,l2 l3 l4 c1,c2 c4,c32 c5,c31 c10,11,12, 19,20,21 c3,c29 c9 c24 c34 c14,c26 c6,7,8, 15,23,30 c13,c18 r2,4,15,18 r16 r21 r5,r19 r8 r7,10,12 r3,r17 r13 r6 r9,11,20 r1 c16,17,22, 27,28,33 d3,d5 mosfet mosfet mosfet controller diode diode * inductor inductor inductor cap, tantalum cap, poscap cap, poscap cap, poscap cap, ceramic cap, ceramic cap, ceramic cap, ceramic cap, ceramic cap, ceramic cap, tantalum resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor resistor capacitor diode irf7460 irf7457 irlr2703 iru3046 bat54s bat54a or 1n4148 d03316p-102 d05022p-222hc d05022p-332hc ecs-t1cd336r 16tpb47m 6tpb330m 6tpc150m ecj-2vf1e104z ecj-3yb1e105k ecj-2vb1h222k ecj-2vb1h682k ecj-2vc1h471j ecj-2vf1c105z ecs-t1ad476r erj-m1wsf5mou ir ir ir ir ir ir any coilcraft coilcraft coilcraft panasonic sanyo sanyo sanyo panasonic panasonic panasonic panasonic panasonic panasonic panasonic panasonic 20v, 10m , 12a 20v, 7m , 15a 30v, 0.045 , 23a synchronous pwm fast switching fast switching 1 h, 6.8a 2.2 h, 12a 3.3 h, 10a 33 f, 16v 47 f, 16v 330 f, 6.3v 150 f, 6.3v, 40m 0.1 f, y5v, 25v 1 f, x7r, 25v 2200pf, x7r, 50v 6800pf, x7r, 50v 470pf, x7r, 50v 1 f, y5v, 16v 47 f, 10v 2.15 29.4k 16.5k 4.7 200, 1% 1k, 1% 5m , 1w, 1% 15k 10 open short, 0 open open irf.com coilcraft.com maco.panasonic.co.jp sanyo.com/industrial maco.panasonic.co.jp bill of material * use these diodes for source/sink applications when the inductor current goes negative and for the fast load transient from full output load to no load.
IRDC3046 6 rev. 1.0 05/22/02 www.irf.com figure 4 - ch1: gate signal for control fet (master, pin-15). ch2: gate signal for control fet (slave, pin-10). ch3: inductor current for master channel (l3). ch4: inductor current for slave channel (l4). v master =5v, v slave =12v, i out =10a figure 5 - ch1: gate signal for sync fet (master, pin-14). ch2: gate signal for sync fet (slave, pin-11). ch3: inductor current for master channel (l3). ch4: inductor current for slave channel (l4). v master =5v, v slave =12v, i out =10a figure 6 - ch1: gate signal for control fet (master, pin-15). ch2: gate signal for sync fet (master, pin-14). ch3: gate signal for control fet (slave, pin-10). ch4: gate signal for sync fet (slave, pin-11). test data
IRDC3046 7 rev. 1.0 05/22/02 www.irf.com figure 7 - start-up @ i out = 10a. figure 8 - transient response @ i out = 0 to 10a. figure 9 - transient response for ldo @ i out = 0 to 2a. v in =5v vss v out 0a 2a 10a 0a 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 test data
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