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| IRDC3039EVAL IRU3039 EVALUATION BOARD USER GUIDE INTRODUCTION The IRU3039 controller IC is designed to provide a synchronous Buck regulator and is targeted for applications where the cost and size is critical. The IRU3039 operates with a single input supply up to 20V. The output voltage can be programmed as low as 0.8V for low voltage applications. Selectable current limit is provided to tailor to external MOSFET's on-resistance for optimum cost and performance. The IRU3039 features an uncommitted error amplifier for tracking output voltage and is capable of sourcing or sinking current for applications such as DDR bus termination. This device features a programmable switching frequency set from 200KHz to 400KHz, under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. SPECIFICATION DATA Switcher: VIN = 18V VOUT = 3.3V IOUT = 8A DVOUT = 100mV FS = 200KHz INPUT/OUTPUT CONNECTIONS The following is the input/output connections: Inputs: JP1: Input (+18V), Gnd Outputs: JP2: VOUT (+3.3V), 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 provides easy connections for the oscilloscope voltage probe to monitor the output voltage. Rev. 1.0 05/30/03 www.irf.com 1 IRDC3039EVAL CONNECTION DIAGRAM Load 0 - 8A +20V Gnd Power Supply 6A Supply Figure 1 - Connection diagram of evaluation-board for IRU3039. 2 www.irf.com Rev. 1.0 05/30/03 IRDC3039EVAL LAYOUT The four layers for IRU3039 evaluation board are shown in Figures 2.1-2.4. 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 middle layers are dedicated to Power Ground and Analog Ground. Analog Ground is kept separated from the Power Ground and it is connected at a single point as shown in figure 2.1. Figure 2.1 - Top layer of evaluation-board for IRU3039. Rev. 1.0 05/30/03 www.irf.com 3 IRDC3039EVAL PGnd AnGnd PGnd Figure 2.2 - Middle layer 1. Figure 2.3 - Middle layer 2. Figure 2.4 - Bottom layer. 4 www.irf.com Rev. 1.0 05/30/03 Rev. 1.0 05/30/03 R1 0V R2 L1 Open C2A R6 C3 1uF Open 14 NC VC 9 0V GND 7 5.76K R5 0V R11 0V VREF 1 NC 2 NC 5 NC 3 VCC 4 R4 C8 470pF Q2 IRF7458 R8 4.7 V 330uF 330uF Open 40mV 40mV 8 D2 BAT54 C13A 1uF R3 Q1 IRF7466 L2 4.7uH C9A C9B C9C C12 1uF GND JP2 VOUT 10 C5 13 NC 12 RT 11 NC D1 BAT54S 15 VO2 16 OCSET 17 SS / SD HDRV 15uF 25V 15uF 25V 15uF 25V R14 Open C2B C2C 1uH 18 COMP SCHEMATIC JP1 VIN GND C1 15uF www.irf.com C6 19 FB 6 PGND C2 C7 U1 IRU3039 0.1uF Open 5600pF 20 VP LDRV J1 C13 1uF R7 14K R13 Open R12 Open VDDQ C10 0.1uF C11 1uF R9 3.16K R10 1K IRDC3039EVAL Figure 3 - Schematic of evaluation-board for IRU3039. 5 IRDC3039EVAL BILL OF MATERIAL Ref Desig Description Q1 MOSFET Q2 MOSFET U1 Controller D1 Schottky Diode D2 Schottky Diode L1 Inductor L2 Inductor C1,C2A,B,C Cap, Poscap C5,6,10 Capacitor C7 Capacitor C8 Capacitor C9A,B Cap, Poscap C3,11,12,13 Capacitor C13A Capacitor R4 Resistor R7 Resistor R8 Resistor R9 Resistor R10 Resistor R1,3,5,11 Resistor R2,6,12,13,14 Resistor C2,C9C Capacitor JP1,JP2 Connector J1 Scope Probe Value Qty Part# 30V, 12.5mV, 11A 1 IRF7466 30V, 8mV, 14A 1 IRF7458 Synchronous PWM 1 IRU3039 Fast Switching 1 BAT54S Fast Switching 1 BAT54 1mH, 3A 1 DS1608C-102 4.7mH, 13A 1 DO5022P-472HC 15mF, 25V 4 25TQC15M 0.1mF, Y5V, 25V 3 ECJ-2VF1E104Z 5600pF, X7R, 50V 1 ECU-V1H562KBG 470pF, X7R, 50V 1 ECJ-2VC1H471J 330uF, 40mV 2 6TPB-330M 1mF, Y5V, 16V 4 ECJ-2VF1C105Z 1mF, X7R, 25V 1 ECJ-3YB1E105K 5.76K, 1% 1 14K, 1% 1 4.7V, 1% 1 3.16K, 1% 1 1K, 1% 1 0V 4 Open(NA) 5 Open 2 2 Positive Terminal 2 ED1973-ND 1 131-50310-00 Manuf IR IR IR IR IR Coilcraft Coilcraft Sanyo Panasonic Panasonic Panasonic Sanyo Panasonic Panasonic Web site (www.) irf.com coilcraft.com sanyo.com maco.panasonic.co.jp sanyo.com maco.panasonic.co.jp Digikey Textronix 6 www.irf.com Rev. 1.0 05/30/03 IRDC3039EVAL TYPICAL OPERATING CHARACTERISTICS Test Conditions: VIN=20V, VOUT=3.3V, IOUT=0-8A, Fs=200KHz Figure 4 - Normal condition at No Load. Ch1: HDrv, Ch2: LDrv, Ch4: Inductor Current Figure 5 - Soft-Start. Ch1: VIN, Ch2: VOUT, Ch3: VOUT2, Ch4: Vss Figure 6 - Soft-Start pin grounded. Ch1: HDrv, Ch2: LDrv Figure 7 - Output Ripple. Ch1: Output Ripple, Ch2: HDrv, Ch3: LDrv, Ch4: Inductor Current Rev. 1.0 05/30/03 www.irf.com 7 IRDC3039EVAL TYPICAL OPERATING CHARACTERISTICS Test Conditions: VIN=20V, VOUT=3.3V, IOUT=0-8A, Fs=200KHz 8A 0A Figure 8 - Output shorted at start up. Ch1: VOUT, Ch3: Vss, Ch4: Inductor Current Figure 9 - Load Transient Response Ch1: VOUT, Ch3: Output Current 90 88 86 84 82 80 78 76 74 72 70 0 1 2 3 4 5 6 7 8 9 10 11 Output Current (A) Efficiency (%) Figure 10 - Efficiency Measurement. VIN=20V, VOUT=3.3V 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 8 www.irf.com Rev. 1.0 05/30/03 |
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