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7443320150 Fiches technique(PDF) 27 Page - Microchip Technology |
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7443320150 Fiches technique(HTML) 27 Page - Microchip Technology |
27 / 44 page 2012 Microchip Technology Inc. DS22326A-page 27 MCP19035 6.0 DESIGN EXAMPLE This example illustrates the step-by-step design proce- dure for a 12V to 1.8V synchronous buck converter using the MCP19035 controller. To minimize the design effort, Microchip provides a design tool that is used to calculate the component values. See AN1452 - “Using the MCP19035 Synchronous Buck Converter Design Tool” for further details (DS01452). The electrical parameters are detailed in Table 6-1. 6.0.1 INDUCTOR SELECTION The inductor must be sized for a typical ripple current that is around 30% of maximum output current. The inductor value calculated with Equation 5-1 is 1.16 µH. To compensate against component tolerance, choose the next higher standard value 1.5 µH (typically 20% for high current inductors). The peak current in the inductor can be calculated with Equation 5-2, its value being 17.25A. The inductor must sustain, without saturating, this peak current. To maintain low-conduction losses, the DC resistance of the inductor must be as low as possible. Table 6-2 shows some suitable inductors for this application. TABLE 6-1: DESIGN EXAMPLE ELECTRICAL SPECIFICATION Parameter Test Conditions Min Nominal Max Unit Input Voltage (VIN) 8 12 14 V Output Voltage (VOUT)0 IOUT 15A — 1.8 — V Line Regulation 8.0V VIN 14V — — 0.5 % Load Regulation 0A IOUT 15A — — 0.5 % Output ripple (VOUT_RIPPLE)IOUT = 15A — — 30 mV Input ripple (VIN_RIPPLE)IOUT =15A — — 0.3 V Output overshoot Step from 3.75A to 11.25A — — 100 mV Output undershoot Step from 11.25A to 3.75A — — 100 mV Output current (IOUT)0 — 15 A Efficiency VIN =12V, IOUT = 10A 90 — — % TABLE 6-2: SUITABLE INDUCTORS FROM VARIOUS VENDORS Vendor Part Number Inductance (µH) DCR (m ) ISAT (A) Coilcraft® XAL1010-152MEB 1.5 1.76 36.6 Wurth Elektronik® 7443320150 1.5 2.1 27 TDK - EPC® B82559A0142A013 1.4 1.5 22 Bourns® SRP1270-1R5M 1.5 2.1 48 |
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