STEVAL-ISA039V1

STEVAL-ISA039V1 Single phase 5A step-down converter evaluation board based on L6727 Data Brief Features ■ Input voltage: from 5V to 12V ■ Output voltage: fixed @ 1.25V but customizable by changing resistor ■ Output current:up to 5A ■ Swicthing frequency: 300KHz ) s ( ct u d o Description The purpose of this design is to demonstrate the key features of STMicroelectronics L6727 a new powerful buck controller. The L6727 allow simple, cost effective design of complete step-down voltage regulators. Indeed it provides a full solution by integrating a 0.8V reference, control logic and protection, and NMOS drivers in an 8pin package. L6727 demo board realizes in a twolayer PCB a step-down DC/DC converter and shows the operation of the device in a generalpurpose low-current application. The input voltage can range from 5V to 12V buses and the output voltage is fixed at 1.25V. The application can deliver an output current in excess of 5A. The switching frequency is 300 kHz. r P e bs t e l o STEVAL-ISA039V1 O ) s ( t c u d o r P e t e l o s b O July 2007 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com 4 VIN_POWER VCC GND R16 0 7 8 1uF 0 D1 1N4148 C1 1800uF C38 0 2.2 0 R17 PHASE COMP C2 1800uF R2 3.3 UGATE UGATE PHASE 0 C3 NC BOOT 100nF C10 R3 2.2 NC C9 NC C8 NC C7 0 NC C6 0 NC C5 0 NC C4 0 Q1 NC HSG 4 C13 0 4.7uF 0 1 Q2 NC PHASE NC PHASE 1 L1 NC 2 Q3 NC LSG2 4 C22 NC C21 NC 0 C20 NC 0 C19 NC 0 OUT VOUT1 VOUT 0 GNDOUT1 GNDOUT NC 0 NC 0 C34 NC 0 C33 NC 0 C32 NC 0 C31 0 C30 PHASE 0 2200uF C18 OUT LSG1 4 C17 NC C16 NC C15 NC 0 4.7uF L2 2 T60-18 6Ts R4 1.8 C23 6.8nF NC 0 C29 OUT NC 0 C28 NC 0 C27 0 C26 0 4.7uF 0 Q6 NC 0 0 2200uF C25 0 C12 0 VIN_POWER Q4 STD55NH2LL Q5 STD90NH2LL 1 0 C11 0 HSG 1 1 R11 0 NC HSD LGATE LSG1 0 R10 NC C37 GND FB 0 NC HSD H SD 5 6 R15 LGATE LGATE R5 C36 NC GND L6726A/27 COMP PHASE FB VCC 0 C14 VCC_PIN VCC 3.3 1uF R1 FB R9 2.2k R14 NC PHASE UGATE BOOT U1 GNDIN1 VIN1 VCC 1 GND LGATE R8 0 R13 3.9k 0 5 6 7 8 1 2 3 5 6 7 8 1 2 3 5 6 7 8 1 2 3 GNDIN_POWER 0 VCC GNDCC 2 GND BOOT 3 0 UGATE 4 C24 10nF R12 NC 0 2 3 od 2 3 2 3 r P e t e l o s b O ) (s PHASE GND R18 NC C35 33k R7 COMP COMP u d o FB LGATE R6 12k VCC_PIN ) s ( ct 33pF 2/4 Schematic Figure 1. t c u r P e t e l o s b O Board schematic 1 STEVAL-ISA039V1 Board schematic STEVAL-ISA039V1 2 Revision history Revision history Table 1. Revision history Date Revision 10-Jul-2007 1 Changes Initial release ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O 3/4 STEVAL-ISA039V1 Please Read Carefully: ) s ( ct Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. u d o All ST products are sold pursuant to ST’s terms and conditions of sale. r P e Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. t e l o No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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