IRDC3146EVAL IRU3146 EVALUATION BOARD USER GUIDE INTRODUCTION SPECIFICATION DATA 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. 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 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 IOUT1 = 10A DVOUT = 50mV 2-Phase VIN = 12V VOUT1 = 1.8V IOUT1 = 35A DVOUT = 50mV FS = 300KHz FS = 300KHz www.irf.com 1 IRDC3146EVAL Power Supply 12V CONNECTION DIAGRAM 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 +12V C1 + D C2 + R9 R36 GND R7 R37 R38 D1 N35 C3A + C16 C3B + C3C + C3D + D C3E + C20 N40 N50 10 C17 18 JU5 R35 VCH R10 3 14 VCL N400 C8 VOUT3 C7 C18 C27A 2 C9 VCH2 VCH1 VOUT3 HICCUP DH1 VCC OCSET1 DL1 IRU3146 C R1 N10 R11 R39 N15 19 OCSET1 R12 15 DL1 R13 Q1 R4 21 VP2 C13 R5 N25 JP2 PGND L2 VDDQ VOUT1 R14 C22 C23 R22 Q2Q3gate Q2 R41 C3 COMP1 C12 N20 Q7 Q7gate Q9 16 Comp2 7 VREF R27 R28 1uF VSNS1 VOUT2 27 VREF R43 D2 C5 R42 C19 VSNS2 COMP2 FB1 C J2 R23 26 VP2 R15 FB2 C27F Q3 Comp1 PGND1 R3 C27D C27E Q1gate C11 R2 C27C J1 17 DH1 C10 FB1 C27B N120 VCC 25 N90 JU4 VCL HICCUP U1 BAT54A 22 FB1 R29 R6 C6 R44 R8 RT 4 RT VSNS2 23 VSNS1 5 R16 VSNS2 20 SS1 C15 8 SS2 FB2 DH2 OCSET2 VCC R45 PGOOD 1 6 PGOOD DL2 VOUT + C4A 4x 11 DH2 9 VOUT2 R17 FB2 SS2 B OCSET2 R18 R40 Q4gate Q8gate R19 N200 R20 13 DL2 VOUT R30 C24 R24 Q8 Q4 JP5 L3 J3 VDDQ 12 1uF B J4 C25 R31 Q5 PGND Q6 SYNC R32 FB2 Q10 28 C26 R25 N350 GND C4 VOUT2 Q5Q6gate R21 SYNC 24 C21 VOUT2 JU1 PGND2 VDDQ N100 C14 SS1 JP4 D3 BAT54A N375 VSNS1 JU2 +C4B +C4C +C4D +C4E VP2 C28A C28B C28C C28D C28E C28F R33 R34 R26 General Schematic A A Title Size IRU3146 Number Revision B Date: File: 1 2 3 4 5 28-Jul-2004 C:\Old_Drv\pcb\PCB_last3.ddb Sheet of Drawn By: 6 1 2 3 4 5 6 JP1 +12V D +12V GND R36 D1 VOUT3 C3A + C16 C3B + C3C + C3D + D C3E + C20 N40 VCH N50 10 3 C17 18 C8 14 VCL C7 C18 C27A 25 JU4 VCC 2 C9 HICCUP VCH2 VCH1 VOUT3 VCL U1 HDrv1 VCC OCSET1 R11 LDrv1 C N15 Comp1 21 JP2 19 OCSET1 R12 15 LDrv1 R13 Q1gate Q1 PGND L2 VDDQ VOUT1 Q2Q3gate Q2 IRU3146 C11 R2 C27C J1 17 HDrv1 C10 N10 C27B R41 C3 COMP1 PGND1 C12 VP2 16 R27 1uF VSNS1 26 VP2 C13 N25 Comp2 7 VREF C5 C19 27 VSNS2 COMP2 FB1 C R43 D2 R42 R5 VOUT2 J2 BAT54A 22 FB1 R29 C6 R44 VSNS1 R8 RT 4 RT VSNS2 23 VSNS1 D3 BAT54A 5 VSNS2 6 FB2 C14 SS1 20 SS1 C15 8 SS2 FB2 HDrv2 OCSET2 R45 PGOOD 1 + C4A 4x R18 Q4 PGOOD LDrv2 9 OCSET2 R19 SYNC 24 C21 JP5 C4 VOUT2 N200 VOUT2 13 LDrv2 R20 Q5Q6gate B J4 R31 PGND Q5 J3 FB2 28 C28A JU2 C28B C28C R33 Dual Outputs A Title Size IRU3146 Number Revision B Date: File: 1 1uF 12 SYNC GND A +C4C L3 JU1 PGND2 +C4B Q4gate SS2 B VCC 11 HDrv2 2 3 4 5 28-Jul-2004 C:\Old_Drv\pcb\PCB_last3.ddb Sheet of Drawn By: 6 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 Rev.1.0 7/28/04 Value Qty 2 30V,11mOhm 30V, 6mOhm 2 Synchronous PWM 1 1 Fast Switching Fast Switching 2 2.45mH,12A,4.9mV 2 8 47mF, 16V 330mF,6.3V,40mV 6 0.1mF, Y5V, 25V 3 2 1mF, X7R, 25V 1mF, Y5V, 16V 9 10nF, X7R, 50V 1 1 15nF, X7R, 50V 5.65KV 1 3.9K 1 1 33K 5.11K, 1% 2 2.15K, 1% 2 4 1kV, 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 www.irf.com 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 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 % Efficiency 85 80 75 1.8V out 2.5V out 70 65 60 55 50 0 2 4 6 8 10 12 14 16 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 +12V C1 + D C2 + GND R36 D1 VOUT3 C3A + C16 C3B + C3C + C3D + D C3E + C20 N40 VCH N50 10 3 C17 18 C8 14 VCL C7 C18 C27A 25 JU4 VCC 2 C9 HICCUP VCH2 VCH1 VOUT3 VCL U1 HDrv1 VCC OCSET1 R11 LDrv1 C N15 Comp1 21 C27D C27E JP2 19 OCSET1 R12 15 LDrv1 R13 Q1gate Q1 PGND L2 VDDQ VOUT1 C23 R22 Q2Q3gate Q2 IRU3146 C11 R2 C27C J1 17 HDrv1 C10 N10 C27B R41 C3 COMP1 PGND1 C12 VP2 16 R27 1uF VSNS1 26 VP2 D2 C5 R42 C13 R5 N25 Comp2 7 VREF VSNS1 RT 4 27 VREF COMP2 FB1 R8 RT VSNS2 BAT54A 22 FB1 R29 23 VSNS1 JP4 D3 BAT54A VDDQ VOUT 5 N100 C14 VOUT2 SS1 20 SS1 C15 SS2 8 FB2 HDrv2 OCSET2 R45 PGOOD 1 6 VOUT FB2 11 HDrv2 + C4A 4x R18 Q4 PGOOD LDrv2 9 OCSET2 R19 SYNC 24 C24 R24 JP5 L3 C4 VOUT2 N200 VOUT2 13 LDrv2 R20 1uF B J4 Q5Q6gate PGND Q5 J3 JU1 PGND2 C21 Q4gate SS2 B VCC C J2 12 SYNC GND 28 C28A C28B C28C C28D C28E JU2 +C4B A +C4C +C4D +C4E 2-Phase, Single Output A Title Size IRU3146 Number Revision B Date: File: 1 2 3 4 5 28-Jul-2004 C:\Old_Drv\pcb\PCB_last3.ddb Sheet of Drawn By: 6 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 0.8mH,27A,1.56mV 2 47mF, 16V 12 330mF,6.3V,40mOhm 10 0.1mF, Y5V, 25V 2 1mF, X7R, 25V 2 10 1mF, 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