MikroElektronika
Buck 9 Click
Buck 9 Click
SKU:MIKROE-3057
Couldn't load pickup availability
Share
Besides its protection features, MP9943 is also equipped with a soft-start function, and a sync option, making this Click board™ a very useful solution for the development of applications that require regulated 3.3V or 5V power supply. It can be used for a range of different applications: distributed power supply units (PSUs), wall transformer regulators, single board systems, general points of load, and similar applications that require regulated 3.3V or 5V power supply.
How Does It Work?
Buck 9 click is equipped with the MP9943, a synchronous step-down converter, from Monolithic Power Systems (MPS). This is an advanced integrated step-down converter, which requires a minimum number of external components, readily available on the market. It utilizes a peak-current-mode control architecture, which ensures an exceptional transient response and feedback loop stabilization. THE MP9943 buck converter features over-current, under-voltage, and thermal protection, making Buck 9 click a robust and reliable power supply solution.
The output voltage is determined by the feedback voltage on the FB pin. Buck 9 click is equipped with a voltage divider and an SMD jumper, labeled as VOUT. This jumper can be used to connect one of two available voltage divider resistors, allowing the output to be set to either 3.3V or 5V. These two voltages are the most commonly used in embedded development.
The over-current protection is based on cycle-by-cycle limiting of the inductor current. If the output voltage starts to drop during the current limiting interval, causing the FB voltage to drop under 84% of the internal reference, the device enters the hiccup mode, shutting down the output. After a fixed period, the device will try to re-enable the output. If the short-circuit condition still exists, it will shut down the output again, repeating the whole process, until the short-circuit condition disappears. The hiccup mode greatly reduces the short-circuit current, protecting the device when the output is shorted to ground.
Thanks to its ability to work with the high duty cycle of the internal switching PWM signal, the MP9943 requires the input voltage to be only about 0.7V above the output voltage, in order to maintain the regulation. However, if the input voltage drops under 3.3V, the device will not be able to operate properly. Therefore, the under-voltage protection shuts down the device, as a protection measure. The under-voltage protection is disabled once the input voltage exceeds 3.5V. This small hysteresis of 0.2V prevents erratic behavior in border-cases.
The MP9943 has some other advanced features, including synchronization with the external clock in the range from 200kHz up to 2.2MHz over the EN/SYNC pin. The same pin is also used as a Chip Enable for the device. The EN/SYNC pin is routed to the mikroBUS™ PWM pin, allowing to both synchronize and enable the MP9943 by the host MCU. The MP9943 operates at high (fixed) switching frequency of 410 kHz, which allows a good compromise between the efficiency and the size of the external components.
As mentioned before, the voltage of the power supply at the input terminal should stay within the range between 4V and 36V. However, if the output voltage is set to 5V, the voltage at the input should be approximately 5.7V to 6V at least, in order to provide a good regulation at the output.
Specifications
Type | Buck |
Applications | A very reliable regulated power supply for a range of different applications: distributed power supply units (PSUs), wall transformer regulators, single board systems, general points of load, and similar applications that require regulated 3.3V or 5V power supply. |
On-board modules | MP9943, a synchronous step-down converter, from Monolithic Power Systems (MPS) |
Key Features | Low power dissipation due to high efficiency, over-current, under-voltage, and thermal protection, selection between two most commonly used voltage values, etc. |
Interface | GPIO |
Input Voltage | 3.3V |
Click board size | M (42.9 x 25.4 mm) |
Onboard Setting And Indicators
Label | Name | Default | Description |
---|---|---|---|
PWR | PWR | - | Power LED indicator |
VIN | VIN | - | External PSU input connector |
VOUT | VOUT | - | Output connector |
JP1 | VOUT SEL | 3.3V | Output voltage selection: left position 3.3V, right position 5V |
Buck 9 Click Electrical Specifications
Description | Min | Typ | Max | Unit |
---|---|---|---|---|
Input Voltage | VOUT + 0.7 | - | 36 | V |
Output voltage (VOUT) | 3.3 | - | 3 | V |
Output current (continuous) | 0 | - | 3 | A |
Software Support
We provide a library for the Buck 9 Click on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
Library carries functions related to GPIO pins control of the Buck 9 click board. The library includes function for enable or disable device.
Key functions:
-
void buck9_deviceEnable(uint8_t state)
- Function for enable or disable device.
Examples description
The application is composed of the three sections :
- System Initialization - Sets PWM pin as OUTPUT.
- Application Initialization - Initialization driver init and disable device.
- Application Task - (code snippet) - Enable and Disable device every 5000 ms.
Application Task - Predefined characters are inputed from the serial port. Depending on the character sent the signal frequency, waveform or amplitude will be changed.
void applicationTask() { buck9_deviceEnable(_BUCK9_DEVICE_ENABLE); Delay_ms( 5000 ); buck9_deviceEnable(_BUCK9_DEVICE_DISABLE); Delay_ms( 5000 ); }
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
GPIO
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.
MikroSDK
This click board is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant click board demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.




New Products
-
Sold out
OAK 4 D Auto Focus
Vendor:LuxonisRegular price Rs. 95,479.00Regular priceUnit price / perSold out -
Sold out
OAK 4 D Fixed Focus
Vendor:LuxonisRegular price Rs. 95,479.00Regular priceUnit price / perSold out -
Sold out
OAK 4 D Wide
Vendor:LuxonisRegular price Rs. 106,719.00Regular priceUnit price / perSold out -
Sold out
OAK-FFC IMX577 M12
Vendor:POLOLURegular price Rs. 8,499.00Regular priceUnit price / perSold out -
Pololu Ideal Diode Reverse Voltage Protector, 4-60V, 20A
Vendor:POLOLURegular price Rs. 329.00Regular priceUnit price / perSold out -
Pololu Ideal Diode Reverse Voltage Protector, 4-60V, 25A
Vendor:POLOLURegular price Rs. 439.00Regular priceUnit price / perSold out -
Pololu I²C Isolator, ISO1640
Vendor:POLOLURegular price Rs. 449.00Regular priceUnit price / per -
3pi+ 32U4 OLED Robot Kit with 30:1 MP Motors (Standard Edition Kit)
Vendor:POLOLURegular price Rs. 15,549.00Regular priceUnit price / per -
Conductivity Calibration K 1.0 Set (4 pouches)
Vendor:Atlas ScientificRegular price Rs. 1,599.00Regular priceUnit price / perSold out -
Analog Discovery 3 Pro Bundle
Vendor:DigilentRegular price Rs. 42,569.00Regular priceUnit price / per -
Lighthouse swarm bundle - Crazyflie 2.1+ (250mAh batteries)
Vendor:BitcrazeRegular price Rs. 474,999.00Regular priceUnit price / perSold out -
Loco Swarm bundle - Crazyflie 2.1+ (250mAh batteries)
Vendor:BitcrazeRegular price Rs. 544,999.00Regular priceUnit price / perSold out -
Kopis X8 Cinelifter 5" Kit - Caged (Frame Kit)
Vendor:HolybroRegular price Rs. 28,199.00Regular priceUnit price / per -
Atlas Scientific i3 InterLink
Vendor:Atlas ScientificRegular price Rs. 6,349.00Regular priceUnit price / per -
Sold out
PoE Injector
Vendor:LuxonisRegular price Rs. 2,099.00Regular priceUnit price / perSold out -
Sold out
1-Port VINT Hub Phidget
Vendor:PhidgetsRegular price Rs. 2,699.00Regular priceUnit price / perSold out -
Holybro 1045 Propeller 2 Pair CW+CCW-Black
Vendor:HolybroRegular price Rs. 1,549.00Regular priceUnit price / per -
ACS37220LEZATR-100B3 Current Sensor Large Carrier -100A to +100A, 3.3V
Vendor:POLOLURegular price Rs. 829.00Regular priceUnit price / per -
CT433-HSWF50MR TMR Current Sensor Compact Carrier -50A to +50A, 3.3V
Vendor:POLOLURegular price Rs. 1,039.00Regular priceUnit price / per -
A5984 Stepper Motor Driver Carrier, Adjustable Current, Blue Edition
Vendor:POLOLURegular price Rs. 409.00Regular priceUnit price / per -
A5984 Stepper Motor Driver Carrier, Fixed 1A@5V / 660mA@3.3V, Blue Edition (Soldered Header Pins)
Vendor:POLOLURegular price Rs. 489.00Regular priceUnit price / per -
A5984 Stepper Motor Driver Carrier, Fixed 500mA@5V / 330mA@3.3V (Soldered Header Pins)
Vendor:POLOLURegular price Rs. 469.00Regular priceUnit price / per -
T Connector Male-Female Pair
Vendor:POLOLURegular price Rs. 169.00Regular priceUnit price / per -
Pololu Reverse Voltage Protector, 4-60V, 10A
Vendor:POLOLURegular price Rs. 159.00Regular priceUnit price / per -
Pololu Reverse Voltage Protector, 4-60V, 12A
Vendor:POLOLURegular price Rs. 199.00Regular priceUnit price / per