Datenblatt für MIKROE-3055 von MikroElektronika

@Miflmflelflmm DEVELOPMENT VOOLS | COMPlLERS | Books 0900 mulw .vw VOLTAGE '7 REGULATOR VREG E cllck PID: 5 output voltage with the ripple lower than SmV, short circuit protection with the LED indicator, and high efficiency with minimal power dissipation. The main output supporting electronics allows for the reduced dissipation, voltage regulation and short- circuit indication. It consists of the LM358, a dual operational amplifier (op-amp) with
VREG 2 click
PID: MIKROE‐3055
Weight: 32g
VREG2click is a voltage regulator click, with outstanding performances. It has a steady
output voltage with the ripple lower than 5mV, short circuit protection with the LED
indicator, and high efficiency with minimal power dissipation. The main output
regulation element is the LM317, a well-established adjustable voltage regulator, often
used in various electrical designs, for its outstanding regulation characteristics. The
supporting electronics allows for the reduced dissipation, voltage regulation and short-
circuit indication. It consists of the LM358, a dual operational amplifier (op-amp) with
high voltage gain, and the LM2596 buck converter. The VREG 2 click can be used with
the input voltage in the range of 10V to 35V, and output voltage in the range of 2.5V to
15V, with current up to 600mA.
wall adapter regulators, general purpose power supplies, distributed supply regulators, and similar applications where voltage regulation with the low ripple and wide input one is a linear voltage regulator, while the second is a switching step down converter also known as the buck converter. Such topology combines the benefits of both worlds: input and output voltage of the linear regulator. Unlike the buck converter, a large difference between the input and the output voltage on the linear regulator lead to sun in mm um-gmm innm saw:- w . 35v nmm mutant 9 amp 15v lmuunvminils umpmwmlnnis wasss man mass Shun Circuit / marcurmntlED ifldlDlIM iner in] indicltm was a um ’ The Click board” uses the LM2 596, a 3A, step down voltage regulator working at 150 kHz, from s. It belongs to Simple Switcher'” line of products, meaning range between 9V and 35V. This IC has a reasonably simple layout withjust a few external pins. The output voltage of the DC-DC converter is regulated by the feedback emitter, which is used to provide about 3V more voltage on its output, than the desired target voltage. This provides an ideal voltage headroom for the linear regulator,
Due to its performance, this Click board™ can be used for applications which require low
ripple regulated voltage within a range between 2.5V and 15V. It can be also used for
wall adapter regulators, general purpose power supplies, distributed supply regulators,
and similar applications where voltage regulation with the low ripple and wide input
voltage range is required.
How does it work?
The electrical circuit on this Click board™ consists of two voltage regulators of which
one is a linear voltage regulator, while the second is a switching step down converter
also known as the buck converter. Such topology combines the benefits of both worlds:
linear regulator offers very low voltage ripple and noise, while the switching regulator
provides optimal working conditions, avoiding large voltage difference between the
input and output voltage of the linear regulator. Unlike the buck converter, a large
difference between the input and the output voltage on the linear regulator lead to
significant dissipation losses.
The Click board™ uses the LM2596, a 3A, step down voltage regulator working at 150
kHz, from TexasInstruments. It belongs to Simple Switcher™ line of products, meaning
that it supports both continuous and discontinuous modes. This buck DC-DC converter
itself can handle from 4.5V up to 40V, but the circuit works reliably with voltages in the
range between 9V and 35V. This IC has a reasonably simple layout with just a few
external pins. The output voltage of the DC-DC converter is regulated by the feedback
loop. Normally, there is a voltage divider with its center pin routed to the FB pin of the
LM2596, but on this Click board™, there is a PNP BJT with the 2.7V Zener diode on its
emitter, which is used to provide about 3V more voltage on its output, than the desired
target voltage. This provides an ideal voltage headroom for the linear regulator,
allowing for greater efficiency and less power dissipation.
voltage regulator, from Texas Instruments. This IC is used on many voltage regulation designs, as it is very simple, reliable and does not require a big number of external headroom for LM317 IC. The ADJ pin is used to set the output voltage on this IC. It is driven by the output of the first op-amp of the LM358 IC, a dual operational amplifier, non-inverting input. By applying an additional RC filter, PWM signal is converted to a constant linear voltage ranging up to 3.3V, as it is limited by another Zener diode on this voltage to be measured by the host MCU. Therefore, this pin is routed to the mikroBUSTM AN pin. IC, working as a comparator. When the current starts flowing through the 0.50 resistor, in the event of a short circuit on the output, it will cause rising of the op-amp output
The linear voltage regulator is LM317, a well-established three terminal adjustable
voltage regulator, from Texas Instruments. This IC is used on many voltage regulation
designs, as it is very simple, reliable and does not require a big number of external
components. The input voltage is provided from the LM2596 and as already mentioned,
this voltage is about 3V greater than the target regulation voltage, allowing optimal
headroom for LM317 IC. The ADJ pin is used to set the output voltage on this IC. It is
driven by the output of the first op-amp of the LM358 IC, a dual operational amplifier,
from Texas Instruments. The non-inverting input of this op-amp is controlled by the
PWM signal from the MCU and therefore, the mikroBUS™ PWM pin is routed to this
non-inverting input. By applying an additional RC filter, PWM signal is converted to a
constant linear voltage ranging up to 3.3V, as it is limited by another Zener diode on this
input. The inverting pin of this op-amp is connected to an output voltage divider, with
its center tap at 3.3V for the maximum output voltage of 15V. This allows the output
voltage to be measured by the host MCU. Therefore, this pin is routed to the
mikroBUS™ AN pin.
The short circuit protection section is designed with the second op-amp of the LM358
IC, working as a comparator. When the current starts flowing through the 0.5Ω resistor,
in the event of a short circuit on the output, it will cause rising of the op-amp output
voltage. The red LED indicator labeled as OCP will be lit, indicating the short circuit
condition. This will also cause the rising of the FB voltage of the buck regulator,
effectively blocking its operation and cutting the power to the output.
NOTE:DonotconnectGNDINtotheGNDexternally,theserailsshouldremainseparated
andconnectedtotherespectiveterminalinputsontheClickboard™itself.
Specifications
Type Buck
Applications
It can be used for precise voltage regulators, wall adapter regulators, general
purpose power supplies, distributed supply regulators, and similar
applications where voltage regulation with the low ripple and wide input
voltage range is required.
On-board LM2596, a 3A, step down voltage regulator working at 150 kHz, from Texas
This table shows how the pinout on k corresponds to the pinout on the mikroBUS’M socket (the latter shown in the two middle columns). mikm' BUS
modules Instruments; LM317, a three terminal adjustable voltage regulator, from
Texas Instruments; LM358, a dual operational amplifier from Texas
Instruments.
Key Features
Low output voltage ripple, high efficiency and low dissipation losses,
overcurrent and short circuit protection, thermal shutdown, a wide range of
input voltage, adjustable voltage via PWM, output voltage read-out by the
host MCU.
Interface Analog,PWM
Input Voltage 3.3V,5V
Click board
size L (57.15 x 25.4 mm)
Pinout diagram
This table shows how the pinout on VREG2click corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes Pin
Pin Notes
Voltage sensing AN 1 AN PWM 16 PWM Control PWM
NC
2 RST INT 15 NC
NC
3 CS RX 14 NC
NC
4 SCK TX 13 NC
NC 5 MISO SCL 12 NC
NC 6 MOSI SDA 11 NC
NC 7 3.3V 5V 10 +5V Power Supply
Ground GND 8 GND GND 9 GND Ground
VREG 2 click electrical specifications
Description Min Typ Max Unit
Input voltage 9 - 35 V
Output voltage 2.25 - 15 V
Output current - 0.5 0.6 A
Short Circuit Current 0.8 0.9 1.5 A
Onboard settings and indicators
Label Name Default Description
LD1 PWR - Power LED indicator
LD2 OCP - Short circuit/overcurrent protection LED indicator
TB1 VIN - Input power supply connection terminal
(example), developed using MikroElektronika s and .The provided click library is mikroSDK standard compliant. The demo application can run on all the This library provides parsing functions that will allow a user to control the voltage output by inputting user-defined parameters. void vregziworkParameters(uint87t setA, uintSit setB, uintSit setC, uintSit setD) int87t vregziincHandleMuintSit *in); int87t vregzidecHandleMuintSit *in); u int87t vregziprintHand 1er(uint167t *pwm); Examples Description
TB2 VOUT - Regulated output connection terminal
Software support
We provide a library for VREG 2 click on our Libstockpage, as well as a demo application
(example), developed using MikroElektronika compilersand mikroSDK. The provided
click library is mikroSDK standard compliant. The demo application can run on all the
main MikroElektronika developmentboards.
LibraryDescription
This library provides parsing functions that will allow a user to control the
voltage output by inputting user-defined parameters.
Key functions:
voidvreg2_workParameters(uint8_tsetA,uint8_tsetB,uint8_tsetC,uint8_tsetD) -
Function for setting work parameters for setting the output voltage in %.
int8_tvreg2_incHandler(uint8_t*in); - If the setA parameter has been received this
function will return the value of 1.
int8_tvreg2_decHandler(uint8_t*in); - If the setB parameter has been received this
function will return the value of -1.
uint8_tvreg2_printHandler(uint16_t*pwm); - This function returns flags based on the
internal parser state.
ExamplesDescription
The application is composed of three sections:
System Initialization - Initializes GPIO structures.
Application Initialization - Initializes the GPIO driver and configures the PWM
peripheral for controlling VREG2 voltage output.
Application Task - (code snippet) - Based on the data received from the UART
the voltage output will be increased or decreased.
void applicationTaskO ( m UART_Rdy_Ptr() ) ( rxDat[a] = UART_Rd_Ptr(); vreg2_eventTick(); } pmeuty += vreg2_incHandler( Smeat ); pmeuty += vreg2_decHandler( Smeat ); vreg2_parse1nput( arxoat, &parseVoltage[6] , Epmeuty ); temp = vreg2_printHand1er( apwmouty ); if( temp _ ( WordToStr-( pmeuty, text ); mikrobus_10glr1rite( "Voltage set to : _LOG_TEXT ); mikrobus_10glr1rite( text, _LOG_TEXT ); mikrobus_10glr1rite( " as", _LOG_LINE ); } if( temp == VREGZ_BACKSPACE_PRESSED_HANDLE ) ( mikrobus_10glr1rite( " _LOG_LINE ); mikrobus_10glr1rite( parseVoltage, _LOG_TEXT ); } if( temp == VREGZ_CHARACTER_RECEIVED ) ( mikrobus_10glr1rite(rxDat,_LOG_TEXT); } if( temp ( mikrobus_10glr1rite( "Insert value from 1 to 99%", _LOG_LINE ); } vreg2_set( pmeuty ); rxDat[a] = e; VREGZ_VOLTAGE_SET ) VREGZ_NUMBER_PARSER_ENABLED ) void vreg2_set(uint16_t pwmIn) void vreg2_pwmInit() The full application code, and ready to use projects can be found on our
voidapplicationTask()
{
if(UART_Rdy_Ptr())
{
rxDat[0]=UART_Rd_Ptr();
vreg2_eventTick();
}
pwmDuty+=vreg2_incHandler(&rxDat);
pwmDuty+=vreg2_decHandler(&rxDat);
vreg2_parseInput(&rxDat,&parseVoltage[0],&pwmDuty);
temp=vreg2_printHandler(&pwmDuty);
if(temp==VREG2_VOLTAGE_SET)
{
WordToStr(pwmDuty,text);
mikrobus_logWrite("Voltagesetto:",_LOG_TEXT);
mikrobus_logWrite(text,_LOG_TEXT);
mikrobus_logWrite("%",_LOG_LINE);
}
if(temp==VREG2_BACKSPACE_PRESSED_HANDLE)
{
mikrobus_logWrite("",_LOG_LINE);
mikrobus_logWrite(parseVoltage,_LOG_TEXT);
}
if(temp==VREG2_CHARACTER_RECEIVED)
{
mikrobus_logWrite(rxDat,_LOG_TEXT);
}
if(temp==VREG2_NUMBER_PARSER_ENABLED)
{
mikrobus_logWrite("Insertvaluefrom1to99%",_LOG_LINE);
}
vreg2_set(pwmDuty);
rxDat[0]=0;
}
Additional Functions:
voidvreg2_set(uint16_tpwmIn) - Set's the PWM output from 0 to 100%.
voidvreg2_pwmInit() - Initializes the PWM peripheral.
The full application code, and ready to use projects can be found on our Libstockpage.
Other mikroE Libraries used in the example:
PWM Library
UART Library
Conversions Library
C_String Library
Additional notes and information MikroElektronika s, or any other terminal application of your choice, can be To ensure proper operation of mikroSDK compliant click board demo applications, mikroSDK should be downloaded from the and installed for the compiler you
Additionalnotesandinformation
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 by 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.
For more information about mikroSDK, visit the officialpage.
https://www.mikroe.com/vreg‐2‐click?search_query=MIKROE‐3055&results=17‐11‐18