IRU3146

IRDC3146EVAL IRU3146 EVALUATION BOARD USER GUIDE INTRODUCTION The IRU3146 IC is a Dual synchronous Buck controller, providing a cost-effective, high performance and flexible solution. The IRU3146 can be configured as a 2-independent or as a 2-phase controller. The 2-phase configuration is ideal for high current applications. The IRU3146 features 1808 out of phase operation which reduces the required input/output capacitance and results in a fewer number of capacitors needed. Other key features offered by this device include two independent programmable soft starts, programmable switching frequency up to 400KHz per phase, Hiccup current limit and an under voltage lockout function. The current limit is provided by sensing the lower MOSFET's on-resistance for optimum cost and performance. SPECIFICATION DATA This reference board is designed to demonstrate all the features of IRU3146 and can be configured to two types of applications: 1) Dual outputs application (Independent Outputs) 2) 2-phase application (Single Output) This user guide contains the schematic and bill of materials for each of these applications, and the design guidelines are described in data sheet. The MOSFETs sockets on the evaluation board are dual layout for SOIC-8 and Direct FET footprint. INPUT/OUTPUT CONNECTIONS The following is the input/output connections: Inputs: JP1: Vin and Gnd JU4: VCC and Gnd JU5: VCL/VCH1/VCH2 Outputs: JP2: Vout1 for Dual output JP5: Vout2 for Dual output JP4: Vout for 2-phase application The connection points for dual output application are shown in Figure 1. Connect the power supply cables according to this figure, minimizing wire lengths to reduce losses in the wire. Test points J1, J2, J3 and J4 provide easy connection for oscilloscope voltage probe to monitor the inductor points for each PWM section and output voltages. Dual Outputs VIN = 12V VOUT1 = 2.5V IOUT1 = 10A VOUT2 = 1.8V IOUT1 = 10A D VOUT = 50mV FS = 300KHz 2-Phase VIN = 12V VOUT1 = 1.8V IOUT1 = 35A D VOUT = 50mV FS = 300KHz Scope Probe connections: J1 and J3: Inductor point for L2 and L3 J2 and J4: Outputs for Vout1 and Vout2 Rev.1.0 7/28/04 www.irf.com 1 IRDC3146EVAL CONNECTION DIAGRAM Power Supply 12V LOAD 0-10A LOAD 0-10A Figure 1 - Connection diagram of evaluation-board for IRU3146 in Dual output configuration 2 www.irf.com Rev.1.0 7/28/04 IRDC3146EVAL LAYOUT The PCB is 4-layers FR4 board, the top layer is dedicated for power components, with two parallel control MOSFETs and two parallel Synchronous MOSFETs. These MOSFETs are dual layout for both SOIC-8 and DirectFET footprint. The input capacitors are all located close to MOSFETs. The two output inductors are located closed to MOSFETs and are symmetrical to the output connector for more accurate current sharing result. The two mid-layers are dedicated for Analog and Power ground, these two grounds are kept separated from each other and they are connected at a single point as shown in Figure3. All the decoupling capacitors, charge pump capacitor and feedback components are located close to the IC. The feedback resistors are tied to the output voltage at the point of regulation. Figure 2 - Top layer of evaluation-board for IRU3146. Rev.1.0 7/28/04 www.irf.com 3 IRDC3146EVAL Figure 3 - Mid layer of evaluation-board for IRU3146. 4 www.irf.com Rev.1.0 7/28/04 1 2 3 4 5 6 JP1 +12V D GND R7 R37 R38 R10 C17 N35 VCH +12V C1 + C2 + R36 R9 D1 N40 C16 C3A + C3B + C3C + C3D + C3E + C20 D VOUT3 C7 C8 N400 R35 C18 N50 18 3 10 JU5 14 VCL U1 C27A C27B C27C C27D C27E C27F JP2 VCL VCH1 HICCUP VOUT3 VCH2 J1 17 DH1 19 OCSET1 15 DL1 R11 R39 R12 R13 R14 Q1gate Q1 Q7gate Q7 L2 VDDQ 25 2 HICCUP VCC DH1 OCSET1 PGND VOUT1 JU4 VCC C9 C10 IRU3146 C FB1 R1 N10 R2 C11 N15 Comp1 21 COMP1 DL1 Q2Q3gate Q2 Q3 Q9 N120 R22 C23 C22 R41 C3 VOUT2 J2 R43 R42 C5 VSNS2 C PGND1 R3 C12 C13 N25 Comp2 7 COMP2 FB1 R6 VSNS1 R8 RT 4 RT VSNS2 C14 SS1 C15 SS2 8 SS2 OCSET2 VCC R45 PGOOD 1 JU1 SYNC 24 PGND2 SYNC GND JU2 PGOOD DL2 20 SS1 FB2 DH2 VP2 VREF N90 16 26 VP2 R15 D2 27 VREF 22 FB1 23 VSNS1 5 6 VSNS2 FB2 R16 R17 D3 BAT54A C19 BAT54A R27 R28 VSNS1 1uF R23 FB2 R4 N20 R5 R29 R44 JP4 VDDQ C6 VOUT N100 VOUT2 + C4A 4x C21 R24 L3 VOUT2 C24 R30 VOUT 11 DH2 9 OCSET2 R18 R40 R19 R20 R21 Q4gate Q8gate N200 Q5Q6gate Q8 Q4 JP5 C4 B J4 B VOUT2 13 DL2 12 28 Q10 R25 C26 C28A R33 C28B C28C C28D C28E C28F R31 C25 1uF N375 Q5 VDDQ Q6 PGND J3 FB2 R32 + C4B + C4C + C4D + C4E VP2 R26 N350 R34 A General Schematic 1 2 3 4 5 A Title Size B Date: File: 28-Jul-2004 C:\Old_Drv\pcb\PCB_last3.ddb Sheet of Drawn By: 6 IRU3146 Number Revision 1 2 3 4 5 6 JP1 +12V D GND +12V R36 VOUT3 VCH C7 C8 C17 D1 N40 C16 D C3A + C3B + C3C + C3D + C3E + C20 14 VCL C18 N50 18 3 10 U1 C27A C27B C27C JP2 VCL VCH1 VOUT3 VCH2 J1 17 HDrv1 19 OCSET1 15 LDrv1 R11 R12 R13 Q1gate Q1 L2 VDDQ 25 JU4 VCC C9 C10 2 HICCUP VCC HDrv1 OCSET1 LDrv1 PGND VOUT1 Q2Q3gate Q2 R41 C3 VOUT2 J2 R43 D2 R42 C5 VSNS2 C C N10 R2 C11 N15 Comp1 21 COMP1 IRU3146 PGND1 16 R27 26 VP2 27 22 FB1 23 VSNS1 D3 BAT54A 5 6 VSNS2 FB2 R18 R19 R20 Q4gate Q4 9 OCSET2 N200 Q5Q6gate Q5 12 FB2 28 J3 R31 L3 C19 BAT54A R29 VSNS1 1uF C12 C13 N25 Comp2 7 COMP2 VP2 VREF FB1 VSNS1 R8 RT 4 RT VSNS2 C14 SS1 C15 SS2 8 SS2 OCSET2 20 SS1 FB2 HDrv2 R5 R44 C6 + C4A 4x + C4B + C4C C21 JP5 VOUT2 11 HDrv2 B VCC R45 PGOOD 1 JU1 SYNC 24 PGND2 SYNC GND JU2 C4 B J4 VOUT2 13 LDrv2 1uF PGOOD LDrv2 PGND C28A R33 C28B C28C A Dual Outputs 1 2 3 4 5 A Title Size B Date: File: 28-Jul-2004 C:\Old_Drv\pcb\PCB_last3.ddb Sheet of Drawn By: 6 IRU3146 Number Revision IRDC3146EVAL BILL OF MATERIAL For Dual Output Application, Vin=12V, Vout1=2.5V@10A, Vout2=1.8V@10A Ref Desig Description Q1,Q4 MOSFET Q2,Q5 MOSFET U1 Controller D1 Diode D2,D3 Diode L2,L3 Inductor C3A-E, C4A-C Cap,Poscap C27B-D, C28D-F Cap,Poscap C14,C15,C16 Cap,Ceramic C17,C18 Cap.Ceramic C3,C4,C5,C6,C7,C8,C9,C20,C21 Cap,Ceramic C11 Cap,Ceramic C13 Cap,Ceramic R2 Resistor R5 Resistor R8 Resistor R12,R19 Resistor R27,R41 Resistor R29,R33,R42,R44 Resistor R31,R43 Resistor R45 Resistor R36 Resistor R3,6,7,10,11,13,15,18,20,35 Resistor R1,4,9,32,39,14,16,17,40,21,22,23,24,28, Resistor R34,37,38,25,26,30 Resistor C1,2,C3A,C4C-E, C27E-F,C28A-D, Capacitor C19,C10,12,23,24,22,25,26 Capacitor Q3,Q6,Q7,Q8,Q9,Q10 Transistor J1,J2,J3,J4 Scope Probe Terminal JP1,JP2,JP5 JU1,JU2,JU4,JU5 Jumper Bumpon Value Qty 2 30V,11mOhm 30V, 6mOhm 2 Synchronous PWM 1 1 Fast Switching Fast Switching 2 2.45m H,12A,4.9mV 2 8 47m F, 16V 330m F,6.3V,40mV 6 0.1m F, Y5V, 25V 3 2 1m F, X7R, 25V 1m F, Y5V, 16V 9 10nF, X7R, 50V 1 1 15nF, X7R, 50V 5.65K V 1 3.9K 1 1 33K 5.11K, 1% 2 2.15K, 1% 2 4 1k V, 1% 1.24K,1% 2 50k,1% 1 1 100V Short, 0V 10 Open 14 6 Open Open 12 Open 8 6 Open 4 2-Pos terminal 3 4 4 Part# IRF7821 IRF8113 IRU3146 BAT54S BAT54A ETQP6F2R5BFA 16TPQC47M 6TPB330M ECJ-2VF1E104Z ECJ-3YB1E105K ECJ-2VF1C105Z ECJ-2VB1H103K ECJ-2VB1H153K Any Manuf IR IR IR IR IR Panasonic Sanyo Sanyo Panasonic Panasonic Panasonic Panasonic Panasonic 131-5031-00 ED1973-ND S1012-02-ND SJ-67A2 Black Tektronix Digi-Key Digi-Key 3M Rev.1.0 7/28/04 www.irf.com 7 IRDC3146EVAL TYPICAL OPERATING WAVEFORMS Figure 4- 2.5V Switching Waveforms at no Load Figure 5- 2.5V Switching Waveforms at 10A Load 8 www.irf.com Rev.1.0 7/28/04 IRDC3146EVAL Figure 6- 1.8V Switching Waveforms at no Load Figure 7- 1.8V Switching Waveforms at 10A Load Rev.1.0 7/28/04 www.irf.com 9 IRDC3146EVAL Figure 8- Power Up Waveforms Figure 9- Power Up Waveforms (Internal Regulator) 10 www.irf.com Rev.1.0 7/28/04 IRDC3146EVAL Figure 9- Shut Down, SS1 pulls Low Figure 10- Shut Down, SS2 pulls Low Rev.1.0 7/28/04 www.irf.com 11 IRDC3146EVAL Figure 11- Short Circuit Condition (Hiccup Mode) for 2.5V Output Figure 12- Short Circuit Condition (Hiccup Mode) for 1.8V Output 12 www.irf.com Rev.1.0 7/28/04 IRDC3146EVAL Figure 12- Load Transient Response Step Load for 2.5V (0-10A) Step Load for 1.8V (0-7A) IRF7821/8113_12V_1.8V_2.5V_0_15A Room Temp 95 90 85 % Efficiency 80 75 70 65 60 55 50 0 2 4 6 8 10 12 14 16 1.8V out 2.5V out Iout Figure 13- Efficiency for 2.5V and 1.8V outputs at room temperature no air flow. L2=L3=2.17uH @ 17A Rev.1.0 7/28/04 www.irf.com 13 1 2 3 4 5 6 JP1 +12V D GND +12V C1 + C2 + R36 VOUT3 VCH C7 C8 C17 D1 N40 C16 C3A + C3B + C3C + C3D + C3E + C20 D 14 VCL C18 N50 18 3 10 U1 C27A C27B C27C C27D C27E JP2 VCL VCH1 VOUT3 VCH2 J1 17 HDrv1 19 OCSET1 15 LDrv1 R11 R12 R13 R22 Q2 16 R27 26 VP2 D2 R42 27 VREF 22 FB1 23 VSNS1 D3 BAT54A 5 N100 VOUT2 6 FB2 R18 R19 R20 Q4gate Q4 9 OCSET2 N200 Q5Q6gate Q5 12 28 C28A C28B C28C L3 VOUT2 VDDQ BAT54A R29 C5 VSNS1 C23 R41 Q1gate Q1 L2 VDDQ 25 JU4 VCC C9 C10 2 HICCUP VCC HDrv1 OCSET1 LDrv1 PGND VOUT1 Q2Q3gate C N10 R2 C11 N15 Comp1 21 COMP1 IRU3146 PGND1 C3 1uF J2 C C12 C13 N25 Comp2 7 COMP2 VP2 VREF FB1 VSNS1 R8 RT 4 RT VSNS2 C14 SS1 C15 SS2 8 SS2 OCSET2 20 SS1 FB2 HDrv2 R5 JP4 VOUT VOUT + C4A 4x C21 R24 C24 11 HDrv2 JP5 B VCC R45 PGOOD 1 JU1 SYNC 24 PGND2 SYNC GND JU2 C4 B J4 VOUT2 13 LDrv2 1uF PGOOD LDrv2 PGND J3 C28D C28E + C4B + C4C + C4D + C4E A 2-Phase, Single Output 1 2 3 4 5 A Title Size B Date: File: 28-Jul-2004 C:\Old_Drv\pcb\PCB_last3.ddb Sheet of Drawn By: 6 IRU3146 Number Revision IRDC3146EVAL BILL OF MATERIAL For 2-Phase Application, Vin=12V, Vout=1.8V@35A Ref Desig Q1,Q4 Q2,Q5 U1 D1 D2,D3 L2,L3 C1,C2,C3A-E, C4A-E C27A-E, C28A-E C14,C16 C17,C18 C3,C4,C5,C7,C8,C9,C20,C21,C23,C24 C10,C12 C11,C13 R2 R5 R8 R12,R19 R22,R24,R29,R42 R27,R41 R36 R3,6,7,11,13,18,20,35,10,16,17,23 R1,4,37,38,9,25,26,34,28,43,44,30,31,33,32 R14,R21,R39,R40,R15 C19,22,25,26,6,19 C15 Q9,Q10 J1,J2,J3,J4 JP1,JP4 JU1,JU2,JU3,JU4,JU5 Description DirectFET DirectFET Controller Diode Diode Inductor Cap, Poscap Cap, Ceramic Cap, Ceramic Cap, Ceramic Cap, Ceramic Cap, Ceramic Cap, Ceramic Resistor Resistor Resistor Resistor Resistor Resistor Value Qty 30V,9mOhm 2 2 30V,4mOhm Synchronous PWM 1 Fast Switching 1 2 Fast Switching 0.8m H,27A,1.56mV 2 47m F, 16V 12 330mF,6.3V,40mOhm 10 0.1m F, Y5V, 25V 2 1m F, X7R, 25V 2 10 1m F, Y5V, 16V 100pF, X7R, 50V 2 15nF, X7R, 50V 2 1 5.11K,1% 6.8K,1% 1 33K,1% 1 2 5K, 1% 1K, 1% 4 1.24K, 1% 2 1 100V Resistor Short, 0V 12 Resistor Open 15 Resistor 5 Open Capacitor Open 6 Short Capacitor 1 Open Transistor 2 2-Pos terminal Scope Probe 4 Terminal 2 Jumper 4 Part# IRF6617 IRF6618 IRU3146 BAT54S BAT54A ETQP1H1ROBFA 16TPQC47M 6TPB330M ECJ-2VF1E104Z ECJ-3YB1E105K ECJ-2VF1C105Z ECJ-2VC1H100J ECU-V1H153KBG Manuf IR IR IR IR IR Panasonic Sanyo Sanyo Panasonic Panasonic Panasonic Panasonic Panasonic 131-5031-00 ED1973-ND S1012-02-ND Tektronix Digi-Key Digi-Key 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. 02/01 Rev.1.0 7/28/04 www.irf.com 15