IRDC3073EVAL IRU3073 EVALUATION BOARD USER GUIDE INTRODUCTION SPECIFICATION DATA The IRU3073 controller IC is designed to provide a low cost synchronous Buck regulator for on-board DC to DC converter for multiple output applications. The outputs can be programmed as low as 0.8V for low voltage applications. Switcher: Linear VIN = 5V Regulator: VOUT1 = 2.5V VIN = 2.5V IOUT1 = 8A (from switch) DVOUT = 50mV VOUT2 = 1.6V FS = 200KHz IOUT2 = 2A Selectable over-current protection is provided by using external MOSFET's on-resistance for optimum cost and performance. Supply Voltage: VCC = VC = 12V This device features a programmable frequency set from 200KHz to 400KHz, under-voltage lockout for all input 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. INPUT/OUTPUT CONNECTIONS The following is the input/output connections: Inputs: JP3: Input (+5V), Gnd JP1: Input (+12V) 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. Outputs: JP4: VOUT1 (+2.5V), Gnd JP2: VOUT2 (+1.6V), Gnd Note: For proper operation, +5V supply should ramp up first. Rev. 1.0 06/30/03 www.irf.com 1 IRDC3073EVAL CONNECTION DIAGRAM +12V Gnd Power Supply 1A Supply Load2 2A +5V Gnd Power Supply Load1 0 - 10A 10A Supply Figure 1 - Connection diagram of evaluation-board for IRU3073. 2 www.irf.com Rev. 1.0 06/30/03 IRDC3073EVAL LAYOUT The four layers for IRU3073 evaluation board are shown in Figures 2.1-2.4. The layout is designed both for direct FET package and SOIC package for power MOSFETs. The input capacitors are all located close to the MOSFETs. All the decoupling capacitors and feedback components are located close to IC. The feedback re- sistors 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 2.3. Figure 2.1 - Top layer of evaluation-board for IRU3073. Rev. 1.0 06/30/03 www.irf.com 3 IRDC3073EVAL LAYOUT Figure 2.2 - Middle layer 1. Figure 2.3 - Middle layer 2. Figure 2.4 - Bottom layer. 4 www.irf.com Rev. 1.0 06/30/03 Figure 3 - Schematic of evaluation-board for IRU3073. IRDC3073EVAL SCHEMATIC Rev. 1.0 06/30/03 www.irf.com 5 IRDC3073EVAL BILL OF MATERIAL Ref Desig Description Q1,Q2 MOSFET Q3 MOSFET U1 Controller D2 Schottky Diode L1 Inductor L2 Inductor C1,C2A,B,C Cap, Poscap C2 Cap, Ceramic C6,C10 Cap, Ceramic C7 Cap, Ceramic C8 Cap, Ceramic C9B,C Cap, Poscap C11,12,15, Cap, Ceramic 16,19,20,21 C13,C14 Cap, Poscap R1 Resistor R2,10,14 Resistor R3,5,11,16, Resistor 20,22,23 R4 Resistor R6 Resistor R7 Resistor R8 Resistor R9 Resistor R12,13,15, Resistor 17,18,19,21 C3,4,5,9,17 Capacitor D1,D3 Diode JP1,2,3,4,5 Connector J1,J2 Scope Probe Circuit Spacer Board Spacer 6 Value 1mH, 5.6A 3.3mH, 17A 47mF, 16V 33pF, NPO, 5% 0.1mF, Y5V, 25V 2200pF, X7R, 50V 470pF, X7R, 50V 330mF, 40mV 1mF, Y5V, 16V Qty 2 1 1 1 1 1 4 1 2 1 1 2 7 150mF, 6.3V 10V 1K, 1% 0V 2 1 3 7 5.1K, 1% 100K 24K, 1% 4.7V, 1% 2.15K, 1% NA (Open) 1 1 1 1 1 7 NA (Open) NA (Open) 2-Pos Terminal 5 2 5 2 4 Bumpon Part# IRF7832 IRLR2703 IRU3073CQ BAT54 DO3316P-102 DO5022P-332HC 16TPB47M ECU-V1H330JCV ECJ-2VF1E104 ECU-V1H222KBV ECJ-2VC1H471J 6TPB330M ECJ-2VF1C1O5Z Manuf IR IR IR IR Coilcraft Coilcraft Sanyo Panasonic Panasonic Panasonic Panasonic Sanyo Panasonic 6TPB150M Sanyo Any Any Any Any Any Any Any Any Any ED1973-ND 131-5031-00 SJ-67A3 Black Digikey Tetronix 3M www.irf.com Web site (www.) irf.com coilcraft.com sanyo.com maco.panasonic.co.jp sanyo.com maco.panasonic.co.jp sanyo.com Rev. 1.0 06/30/03 IRDC3073EVAL TYPICAL OPERATING CHARACTERISTICS Figure 1 - Normal condition at no load. Ch1: HDrv Ch2: LDrv Ch4: Inductor Current Figure 3 - Gate signals when SS pin pulls low. Ch1: HDrv Ch2: LDrv Figure 2 - Gate signals when SS pin pulls low. Ch1: HDrv Ch2: LDrv Rev. 1.0 06/30/03 Figure 4 - Soft-Start. Ch1: VIN (5V) Ch2: Bias Voltage (12V) Ch3: VOUT Ch4: IOUT www.irf.com 7 IRDC3073EVAL TYPICAL OPERATING CHARACTERISTICS Figure 6 - Output Shorted at start-up. Ch1: VOUT Ch2: IOUT Figure 8 - Load Transient Response (PWM Section). Figure 7 - Output Shorted at start-up. Ch1: VOUT Ch2: IOUT Figure 10 - Load Transient Response (PWM Section). 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 06/30/03