buck

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BUCK click

BUCK click is a buck switching regulator that accepts a wide input voltage range of up to 40V and steps it down to 3.3V or 5V.

click Product page

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Click library

• Author : Katarina Perendic
• Date : nov 2019.
• Type : GPIO type

Software Support

We provide a library for the Buck Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Buck Click driver.

Standard key functions :

• Config Object Initialization function.

void buck_cfg_setup ( buck_cfg_t *cfg );

• Initialization function.

BUCK_RETVAL buck_init ( buck_t *ctx, buck_cfg_t *cfg );

• Click Default Configuration function.

void buck_default_cfg ( buck_t *ctx );

Example key functions :

• Setting the switching frequency function

void buck_switch_frequency ( buck_t *ctx, uint8_t frequency );

• Select buck mode (Disable / Enable)

void buck_set_mode ( buck_t *ctx, uint8_t mode );

• Get state internal comparator function

uint8_t buck_get_power_good ( buck_t *ctx );

Examples Description

The demo application displays frequency change and voltage regulation using a BUCK click.

The demo application is composed of two sections :

Application Init

Configuring clicks and log objects. Settings the click in the default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;
    buck_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    buck_cfg_setup( &cfg );
    BUCK_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    buck_init( &buck, &cfg );
    Delay_ms( 100 );

    buck_software_reset( &buck );
    buck_default_cfg( &buck );
}

Application Task

This is a example which demonstrates the use of Buck Click board. Checks if it has reached the set output voltage and sets a different frequency to the LT3976 chip every 5 sec.

void application_task ( void )
{
    //  Task implementation.
    if ( buck_get_power_good( &buck ) == 1 )
    {
        log_info( &logger, "----  Power good output voltage!  ----" );
    }
    Delay_ms( 1000 );

    log_info( &logger, "----  Switching frequency 400kHz!  ----" );
    buck_switch_frequency( &buck, BUCK_FREQ_400KHz );
    Delay_ms( 5000 );

    log_info( &logger, "----  Switching frequency 800kHz!  ----" );
    buck_switch_frequency( &buck, BUCK_FREQ_800KHz );
    Delay_ms( 5000 );
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Buck

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.

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