EL7566DRE-EVAL

USER’S MANUAL EL7566DRE-EVAL TB415 Rev.1.00 Jul 9, 2003 Evaluation Board Introduction The EL7566 is a high efficiency full-featured synchronous 6A step-down regulator. This document lists the completed schematic diagram and BOM, as well as the layout. With components on one side of the PCB, the complete converter occupies less than 0.72in2 of space. Please refer to the datasheet for the application of features. This demo board is preset to 1.8V for VO and operates at 500kHz switching frequency. The measured crossover frequencies are around 50kHz with the compensation values. Circuit Diagram U1 R0 C0 8200pF 7.68K C1 OPEN C2 1 CC SGND 28 2 VREF COSC 27 C7 270pF C11 OPEN C12 OPEN 0.022µF R2 R1 10.2K 12.7K VTJ C4 0.022µF TM R6 10K R5 L1 VOUT 10K SEL 2.7µH C5 150µF + GND 3 FB STN 26 STN 4 VO STP 25 STP 5 VTJ EN 24 EN 6 TM PG 23 7 SEL PG C8 VDD 22 1µF 8 LX VIN 21 9 LX VIN 20 10 LX VIN 19 11 LX PGND 18 12 LX PGND 17 13 LX PGND 16 14 NC NC 15 R3 OPEN C9 1µF R4 OPEN +C VIN 10 100µF GND LX EL7566CRE TB415 Rev.1.00 Jul 9, 2003 Page 1 of 4 Evaluation Board EL7566DRE-EVAL TABLE 1. DEMO BOARD BILL OF MATERIAL WITH SPCAP (VO = 1.8V) DESIGNATOR VALUE PACKAGE C0 8200pF 0603 Any X5R or X7R C2, C4 0.022µF 0603 Any X5R or X7R C5 (Note 1) 150µF/4V D-Size C7 270pF 5% 0603 Any C8 1µF 0603 Any X5R or X7R C9 1µF 0603 Any X5R or X7R C10 (Note 2) 100µF/6V D-Size R0 7.68K/1% 0603 Any R1 12.7K/1% 0603 Any R2 10.2K/1% 0603 Any R5 10K/1% 0603 Any R6 10K/1% 0603 Any L1 2.7µH U1 EL7566DRE HTSSOP-28 MANUFACTURER Panasonic PHONE # PART NUMBER 408-945-5660 EEFUD0G151(X)R Panasonic EEFUD0J101(X)R Coilcraft 847-639-6400 DO3316P-272HC Intersil 888-INTERSIL EL7566DRE NOTES: 1. May be substituted by Sanyo (619-661-6835) POSCAP 4TPE150M. 2. May be substituted by Sanyo POSCAP 6TPE100M or higher value. The output voltage can be as high as the input voltage minus the PMOS and inductor voltage drops. Use R1 and R2 to set the output voltage according to the following formula: R 1  V O = V FB   1 + ------- R 2  Ceramic capacitors (X5R or X7R types only) can be use for the input and output with equivalent capacitance for C5 and C10. Different R0 and C0 are required. Table 3 lists the compensation values with MLCC capacitors. TABLE 3. FEEDBACK RESISTER AND COMPENSATION VALUES WITH MLCC CAPACITORS Where VFB=0.8V When the resisters are changed, please change the compensation capacitor C0 and resister R0. For the convenience, standard values of R1 and R2 are listed in Table 2. R5 and R6 can be eliminated if voltage margin feature is not used. Connect TM and SEL pins directly to ground. 1206, 1210, 1812, and D-size can be placed at C5 and C10 positions. VO (V) C0 (µF) R0 (k) R1 (k) R2 (k) 0.8 0.012 3.09 0 Open 1 0.012 3.57 2.49 10 1.2 0.012 4.42 4.99 10 1.5 0.012 5.23 10 11.5 1.8 0.012 6.49 12.7 10.2 2.5 0.012 7.68 21.5 10 3.3 0.012 10.5 36 11.5 TABLE 2. FEEDBACK RESISTER AND COMPENSATION VALUES (SPCAP) VO (V) C0 (pF) R0 (k) R1 (k) R2 (k) 0.8 8200 3.57 0 Open 1 8200 4.42 2.49 10 1.2 8200 5.23 4.99 10 1.5 8200 6.49 10 11.5 1.8 8200 7.68 12.7 10.2 2.5 8200 10.5 21.5 10 3.3 8200 13.7 36 11.5 TB415 Rev.1.00 Jul 9, 2003 Page 2 of 4 Evaluation Board EL7566DRE-EVAL Demo Board Layout TOP SILKSCREEN TOP LAYER TB415 Rev.1.00 Jul 9, 2003 BOTTOM LAYER Page 3 of 4 Notice 1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples. You are fully responsible for the incorporation or any other use of the circuits, software, and information in the design of your product or system. Renesas Electronics disclaims any and all liability for any losses and damages incurred by you or third parties arising from the use of these circuits, software, or information. 2. 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