IRDC3048 1 rev. 1.1 06/03/02 www.irf.com specification data introduction iru3048 evaluation board user guide input/output connections the iru3048 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 is configured as 2-independent. iru3048 provides a separate adjustable output by driving a switch as a linear regulator. the evaluation board is designed to provide three outputs (see the iru3048 data sheet for detailed description). switcher: v in1 = 12v v out1 = 3.3v i out1 = 4a v in2 = 5v v out2 = 1.8v i out2 = 4a 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: jp4: +5v and gnd. jp3: +12v and gnd. jp5: +3.3v and gnd. outputs: jp1: +3.3v and gnd. jp2: +1.8v and gnd. jp6: +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 jp7 and jp8 provide easy connections for oscilloscope volt- age probe to monitor the output voltages.
IRDC3048 2 rev. 1.1 06/03/02 www.irf.com figure 1 - connection diagram of evaluation-board for iru3048. connection diagram power supply 6a supply gnd +3.3v gnd +5v gnd +12v 6a supply load 0 - 2a load 0 - 4a load 0 - 4a
IRDC3048 3 rev. 1.1 06/03/02 www.irf.com the top side (component) layer for iru3048 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 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 iru3048.
IRDC3048 4 rev. 1.1 06/03/02 www.irf.com schematic figure 3 - schematic of evaluation-board for iru3048. {doc} a schematic, iru3048eva board a 11 title size document number rev date: sheet of 3.3v @ 4a 1.8v @ 4a +12v gnd gnd gnd gnd +5v +3.3v +2.5v +5v 3.3v v3 +12v q2a irf7313 2 7 8 1 q2b irf7313 4 5 6 3 q3a irf7313 2 7 8 1 q3b irf7313 4 5 6 3 + c11 150uf + c12 150uf c13 1uf r1 2.15 r3 2.15 r10 2.15 r12 2.15 + c21 150uf + c22 150uf c23 1uf r13 4.7 r4 4.7 c1 1uf c7 1uf r6 1.65k r14 442 c10 470p c20 470p + c6 47uf d1 bat54s 3 1 2 c3 0.1uf + c4 33uf q1 irlr2703 1 3 2 r2 10 r5 1.00k r7 1.00k + c15 47uf c24 0.1uf r9 46.4k r11 39.2k c19 1800pf c18 1800pf u1 iru3048 hdrv1 11 ldrv1 10 pgnd 8 fb1 16 fb2 2 hdrv2 6 ldrv2 7 gnd 1 vch2 5 vch1 12 vcc 9 vout3 13 fb3 14 comp1 3 comp2 4 ss 15 l1 1uh jp1 tb2 1 2 jp2 tb2 1 2 jp3 tb2 1 2 jp4 tb2 1 2 jp5 tb2 1 2 jp6 tb2 1 2 l2 1uh jp7 tp 1 2 3 4 5 jp8 tp 1 2 3 4 5 l3 10.2uh l4 6.8uh + c9 47uf c5 1uf c14 1uf r15 1k + c16 150uf r8 1.00k c8 1uf + c2 33uf c17 1uf
IRDC3048 5 rev. 1.1 06/03/02 www.irf.com bill of material ref desig description value qty part# manuf web site (www.) 1 2 1 1 2 1 1 7 2 2 1 2 2 2 1 5 4 1 2 4 1 1 1 1 q1 q2, q3 u1 d1 l1, l2 l3 l4 c1,7,8,13, 14,17,23 c2, c4 c3, c24 c5 c9, c15 c10, c20 c18, c19 c6 c11,12,16 21,22 r1,3,10,12 r2 r4, r13 r5,7,8,15 r6 r9 r11 r14 mosfet mosfet controller diode inductor inductor inductor cap, ceramic cap, tantalum cap, ceramic cap, ceramic cap, tantalum cap, ceramic cap, ceramic cap, poscap cap, poscap resistor resistor resistor resistor resistor resistor resistor resistor irlr2703 irf7313 iru3048cf bat54s ell6sh1r0m etqp6f102hfa ellatv6r8m ecj-2vf1c105z ecs-t1cd336r ecj-2vf1e104z ecj-3yb1e105k ecs-t1ad476r ecj-2vc1h471j ecj-2vb1h182k 16tpb47m 6tpc150m ir ir ir ir panasonic panasonic panasonic panasonic panasonic panasonic panasonic panasonic panasonic panasonic sanyo sanyo 30v, 45m 30v, 29m , 5.2a synchronous pwm fast switching 1 h, 2.9a 10.2 h, 4a 6.8 h, 4a 1 f, y5v, 16v 33 f, 16v 0.1 f, y5v, 25v 1 f, x7r, 25v 47 f, 10v 470pf, x7r, 50v 1800pf, x7r, 50v 47 f, 16v, 70m 150 f, 6.3v, 40m 2.15 10 4.7 1k, 1% 1.65k, 1% 46.4k 39.2k 442 , 1% irf.com maco.panasonic.co.jp sanyo.com/industrial
IRDC3048 6 rev. 1.1 06/03/02 www.irf.com figure 7 - output voltage ripple for 3.3v @ 4a. figure 4 - transient response @ i out = 0 to 2a for 3.3v output. test data figure 5 - transient response @ i out = 0 to 2a for 1.8v output. figure 6 - transient response @ i out = 0 to 2a for 2.5v output. 2a 0a 2a 0a
IRDC3048 7 rev. 1.1 06/03/02 www.irf.com figure 9 - gate signals for 3.3v output. ch1: output current 2a/div. ch2: gate signal for control fet 20v/div. ch3: gate signal for sync fet 10v/div. figure 11 - gate signals for 1.8v output. ch1: output current 2a/div. ch2: gate signal for control fet 10v/div. ch3: gate signal for sync fet 10v/div. 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 figure 8 - output voltage ripple for 1.8v @ 4a. figure 10 - soft-start voltage vs. output voltages. v out1 : 3.3v v out2 : 1.8v v out3 : 2.5v vss
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