LM2596S & LM2577S DC-DC Adjustable Step-Up and step-down Power Supply Module Documentation

Component Name

LM2596S & LM2577S DC-DC Adjustable Step-Up and Step-Down Power Supply Module

Overview

The LM2596S & LM2577S DC-DC Adjustable Step-Up and Step-Down Power Supply Module is a compact, high-efficiency, and adjustable DC-DC converter module. This module is based on the popular LM2596S and LM2577S voltage regulators from Texas Instruments, which provide a stable and reliable power supply solution for various applications.

Functionality

The LM2596S & LM2577S module is designed to convert a wide range of input voltages to a stabilized output voltage, making it suitable for use in a variety of applications, including

Step-up voltage conversion (boosting a lower voltage to a higher voltage)

Step-down voltage conversion (bucking a higher voltage to a lower voltage)

Voltage regulation for microcontrollers, sensors, and other electronic devices

Key Features

Adjustable Output Voltage: The module features an adjustable output voltage, allowing users to set the desired output voltage between 1.25V and 35V (LM2596S) or 1.23V and 40V (LM2577S) using an onboard potentiometer.
High Efficiency: The module boasts a high efficiency of up to 94% (LM2596S) and 92% (LM2577S), minimizing heat generation and power losses.
Wide Input Voltage Range: The module accepts input voltages between 3V and 40V (LM2596S) or 3V and 60V (LM2577S), making it suitable for use with a variety of power sources.
Short-Circuit Protection: The module features built-in short-circuit protection, which automatically shuts down the module in the event of a short circuit, protecting the module and connected devices from damage.
Overcurrent Protection: The module also features overcurrent protection, which limits the output current to prevent damage to the module and connected devices.
Low Dropout Voltage: The module has a low dropout voltage of 1.5V (LM2596S) and 2.5V (LM2577S), ensuring a stable output voltage even when the input voltage is close to the output voltage.
Compact Design: The module features a compact design, making it ideal for use in space-constrained applications.
Easy to Use: The module requires minimal external components and is easy to use, with a simple and intuitive interface.

Input Voltage Range

3V to 40V (LM2596S), 3V to 60V (LM2577S)

Output Voltage Range

1.25V to 35V (LM2596S), 1.23V to 40V (LM2577S)

Output Current

Up to 3A (LM2596S), up to 2A (LM2577S)

Efficiency

Up to 94% (LM2596S), up to 92% (LM2577S)

Dropout Voltage

1.5V (LM2596S), 2.5V (LM2577S)

Operating Temperature

-40C to 85C

Dimensions

36mm x 22mm x 14mm

Application Ideas

IoT projects requiring a stable and adjustable power supply

Robotics and automation systems

Industrial control systems

Battery-powered devices requiring voltage regulation

Power supplies for microcontrollers, sensors, and other electronic devices

Pin Configuration

LM2596S & LM2577S DC-DC Adjustable Step-Up and Step-Down Power Supply Module Pinout Explanation
The LM2596S and LM2577S are high-performance, adjustable DC-DC converter modules that can be used for both step-up and step-down voltage conversion. Here is a detailed explanation of the pins on these modules:
Pinout:
1. VIN (Input Voltage):
Function: Input voltage pin, connects to the power source.
Voltage Range: 4-40V (LM2596S) or 7-40V (LM2577S)
Current Rating: Dependent on the specific module, typically up to 3A
2. VOUT (Output Voltage):
Function: Output voltage pin, connects to the load.
Voltage Range: Adjustable, depends on the specific module and settings (see below)
Current Rating: Dependent on the specific module, typically up to 3A
3. ADJ (Adjust Pin):
Function: Adjustment pin for output voltage.
Connect a resistor divider network (R1, R2) to set the desired output voltage (see below)
4. GND (Ground):
Function: Ground pin, connects to the negative terminal of the input power source and the load.
5. EN (Enable Pin):
Function: Enable pin, allows the module to be turned on or off.
Connect to a logic-level signal (e.g., microcontroller output) or tie to VIN to enable the module.
Resistor Divider Network (R1, R2) for Output Voltage Adjustment:
To adjust the output voltage, a resistor divider network is required. The resistors R1 and R2 are connected between the ADJ pin and GND, and the ADJ pin and VOUT, respectively.
R1: Connects ADJ pin to GND
R2: Connects ADJ pin to VOUT
The output voltage (VOUT) can be calculated using the following formulas:
For LM2596S:
VOUT = 1.23V (1 + R2/R1)
For LM2577S:
VOUT = 1.23V (1 + R2/R1) (VIN/1.23V)
Example Connection Diagram:
Here's an example connection diagram for the LM2596S module:
```
+---------------+
| Power Source |
| (4-40V, 3A) |
+---------------+
|
|
v
+---------------+
| VIN (Input) |
| (4-40V, 3A) |
+---------------+
|
|
v
+---------------+
| LM2596S |
| Module |
+---------------+
|
|
v
+---------------+
| ADJ (Adjust) |
| R1 10k |
| R2 22k |
+---------------+
|
|
v
+---------------+
| VOUT (Output)|
| (Adjustable) |
+---------------+
|
|
v
+---------------+
| Load (e.g., |
| LED, Motor) |
+---------------+
|
|
v
+---------------+
| GND (Ground) |
| |
+---------------+
|
|
v
+---------------+
| EN (Enable) |
| (Logic-Level) |
+---------------+
```
Important Notes:
Make sure to use the correct input voltage range for your specific module.
The output voltage range is adjustable, but the maximum current rating should not be exceeded.
The EN pin can be connected to a logic-level signal (e.g., microcontroller output) to enable or disable the module.
Use proper heat sinking and thermal management to ensure the module operates within its rated specifications.
By following this documentation, you should be able to connect the pins of the LM2596S and LM2577S DC-DC adjustable step-up and step-down power supply modules correctly and adjust the output voltage to meet your specific requirements.

Code Examples

LM2596S & LM2577S DC-DC Adjustable Step-Up and Step-Down Power Supply Module

Overview

The LM2596S and LM2577S are DC-DC adjustable step-up and step-down power supply modules that convert input voltages to a regulated output voltage. These modules are based on the LM2596 and LM2577 switching regulators, which provide high efficiency and stability. The modules feature adjustable output voltage, high current capability, and low dropout voltage, making them suitable for a wide range of applications.

Features

Input voltage range: 3V to 40V
 Output voltage range: 1.25V to 35V (adjustable)
 Output current: up to 3A (LM2596S) and up to 1A (LM2577S)
 High efficiency: up to 92%
 Low dropout voltage: 0.5V (typical)
 Overcurrent protection
 Short-circuit protection

Pinout

The module has the following pins:

VIN: Input voltage (3V to 40V)
 VOUT: Adjustable output voltage (1.25V to 35V)
 GND: Ground
 ADJ: Adjustment pin for output voltage
 EN: Enable pin (active low)

Code Examples

Here are a few code examples that demonstrate how to use the LM2596S and LM2577S modules in various contexts:

Example 1: Arduino Code for Adjustable Power Supply

In this example, we'll use an Arduino board to control the output voltage of the LM2596S module.

```c++
const int adjPin = A0;  // Adjustment pin connected to analog input A0
const int enPin = 2;  // Enable pin connected to digital output 2

void setup() {
  pinMode(enPin, OUTPUT);
  digitalWrite(enPin, LOW);  // Enable the module
}

void loop() {
  int voltage = analogRead(adjPin);  // Read the adjustment pin voltage
  float outputVoltage = (voltage  3.3) / 1023;  // Calculate the output voltage
  Serial.print("Output voltage: ");
  Serial.print(outputVoltage);
  Serial.println(" V");
  delay(1000);
}
```

In this example, the adjustment pin is connected to an analog input on the Arduino board, which reads the voltage on the pin. The output voltage is calculated based on the reading and printed to the serial console.

Example 2: Raspberry Pi Code for Powering a Peripheral

In this example, we'll use a Raspberry Pi to control the output voltage of the LM2577S module to power a peripheral device.

```python
import RPi.GPIO as GPIO

# Set up the GPIO library
GPIO.setmode(GPIO.BCM)

# Define the GPIO pins
adj_pin = 17
en_pin = 23

# Set up the GPIO pins as outputs
GPIO.setup(adj_pin, GPIO.OUT)
GPIO.setup(en_pin, GPIO.OUT)

# Set the adjustment pin to 50% duty cycle ( approximately 2.5V output)
GPIO.startPWM(adj_pin, 50)

# Enable the module
GPIO.output(en_pin, GPIO.LOW)

# Use the peripheral device...
```

In this example, the Raspberry Pi's GPIO pins are used to control the adjustment pin and enable pin of the LM2577S module. The output voltage is set to approximately 2.5V using the PWM pin.

Note: These code examples are for illustration purposes only and may require modifications to suit specific use cases.

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LM2596S & LM2577S DC-DC Adjustable Step-Up and step-down Power Supply Module