STEVAL-ISA028V1

STEVAL-ISA028V1 Single phase 20 A step-down converter evaluation board based on the L6727 Data Brief Features ■ BOM optimized for 12 V input / 1.25 V output @ 20 A ■ High flexibility to host wide range designs ■ Customizable output voltage ■ L6726A / L6727 compatibility ■ Controller input voltage (VCC) range from 5 V to 12 V ■ Conversion input voltage (VIN) up to 13.2 V ■ DPAK / SO-8 / PowerSO-8 / PowerFLAT MOSFET compatibility ■ Multi-footprint for input and output capacitors ■ Through-hole / SMD inductor compatibility ■ 4-layer PCB ) s ( ct u d o r P e t e l o )- Description s b O STEVAL-ISA028V1 s ( t c This evaluation board demonstrates the key features of STMicroelectronics’ L6727, a new powerful new buck controller. The L6727 makes the design of complete step-down voltage regulators simple and cost effective. It provides a full solution by integrating a 0.8 V reference, control logic and protection, and NMOS drivers in an 8-pin package. The L6727 evaluation board implements a step-down DC/DC converter in a four-layer PCB and demonstrates the operation of the device in a general-purpose application. The input voltage can range from 5 V to 12 V and the output voltage is fixed at 1.25 V. The application can deliver an output current up to 20 A. Airflow must be applied with current higher than 18 A (@VIN = 5 V). The switching frequency is 300 kHz. u d o r P e t e l o s b O December 2007 Rev 2 For further information contact your local STMicroelectronics sales office 1/4 www.st.com 4 VCC FB COMP PHASE L6726A/27 C24 LGATE GND UGATE BOOT 5 6 7 8 R7 33pF 10nF R13 3.9k 0 0 NC R14 2.2k 0 R12 NC R9 R8 0 NC C36 R15 LGATE LGATE R5 LGATE PHASE R3 C10 BOOT 100nF 0 C3 NC 0 C4 NC 0 C5 NC 0 0 1 HSG 1 LSG1 NC 0 2.2 0 C8 NC VIN_POWER C7 NC C6 NC C37 R10 NC 0 NC 0 R11 Q5 STD90NH2LL 1 Q4 STD55NH2LL Q6 NC 0 C11 4.7uF 0 C9 NC 0 0 C23 6.8nF R4 1.8 L2 2 T60-18 6Ts 0 C12 4.7uF Q1 NC 1 0 C15 0 NC C13 4.7uF HSG 4 t e l o C26 2200uF NC C25 NC C27 0 0 0 0 u d o 0 Q2 NC 0 0 NC C29 OUT 0 C28 NC C19 C31 C30 0 NC 0 NC 0 C32 0 0 0 C21 NC NC Q3 NC 2 0 NC C33 0 NC C22 LSG2 4 NC L1 NC C20 PHASE 1 2200uF NC C18 OUT LSG1 4 C17 NC C16 NC r P e C35 33k FB 2.2 UGATE 3.3 R2 C2 1800uF UGATE 0 R17 PHASE COMP 0 C38 D1 1N4148 VCC_PIN VCC 3.3 1uF R1 C14 1uF FB 4 3 2 1 U1 GND VCC 0 COMP GND VCC R16 0 C1 1800uF s b O R6 12k R18 NC LGATE GND UGATE BOOT 0 GNDCC VCC 0 2 GNDIN_POWER d o r t c u 3 GNDIN1 2 VIN1 HSD H SD ) (s 2 5 6 7 8 PHASE VCC_PIN HSD COMP PHASE FB GND 3 5 6 7 8 2/4 1 2 3 s b O OUT 0 NC C34 0 GNDOUT1 GNDOUT VOUT1 VOUT GND PHASE PHASE 3 P e t e l o 1 2 3 Figure 1. 5 6 7 8 1 1 2 3 VIN_POWER Board schematic STEVAL-ISA028V1 Board schematic Schematic ) s ( ct STEVAL-ISA028V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 10-Jul-2007 1 Initial release 06-Dec-2007 2 Content reworked to improve readability. No content change. ) 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-ISA028V1 Please Read Carefully: ) s ( ct Information in this document is provided solely in connection with ST products. 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