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ANSELA 数据表(PDF) 7 Page - Microchip Technology |
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ANSELA 数据表(HTML) 7 Page - Microchip Technology |
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7 / 222 page  2013 Microchip Technology Inc. DS22331A-page 7 MCP19111 1.0 DEVICE OVERVIEW The MCP19111 is a highly integrated, mixed signal, analog pulse-width modulation (PWM) current mode controller with an integrated microcontroller core for synchronous DC/DC step-down applications. Since the MCP19111 uses traditional analog control circuitry to regulate the output of the DC/DC converter, the integra- tion of the PIC® microcontroller mid-range core is used to provide complete customization of device operating parameters, start-up and shut down profiles, protection levels and fault handling procedures. The MCP19111 is designed to efficiently operate from a single 4.5V to 32V supply. It features integrated synchronous drivers, bootstrap device, internal linear regulator and 4 kW nonvolatile memory all in a space-saving 28-pin 5 mm x 5mm QFN package. After initial device configuration using Microchip’s MPLAB® X Integrated Development Environment (IDE) software, the PMBus or I2C can be used by a host to communicate with, or modify, the operation of the MCP19111. Two internal linear regulators generate two 5V rails. One 5V rail is used to provide power for the internal analog circuitry and is contained on-chip. The second 5V rail provides power to the PIC device and is present on the VDD pin. It is recommended that a 1 µF capacitor be placed between VDD and PGND. The VDD pin may also be directly connected to the VDR pin, or connected through a low-pass RC filter. The VDR pin provides power to the internal synchronous driver. FIGURE 1-1: TYPICAL APPLICATION CIRCUIT HDRV BOOT PHASE LDRV VIN VDD VDR +ISEN -ISEN +VSEN -VSEN GND PGND GPB0 GPA7 GPA4 GPA1 GPB6 GPB7 GPA3 GPB2 GPA2 GPA5 GPB4 GPB5 GPA0 GPB1 GPA6 MCLR ICDCLK ICDDAT SDA SCL SMBus Alert SYNC ADDR0 ADDR1 CNTL PGOOD TRACK MCP19111 VIN +VOUT -VOUT X ICD Programmer MPLAB® |
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