SG3524D

series introduction

# SG3524D Product Series Introduction

## 1. Overview
The SG3524D is a highly versatile and widely - used integrated circuit (IC) belonging to the family of pulse - width modulation (PWM) controllers. These controllers play a crucial role in power electronics applications, where precise control of power delivery is essential. The SG3524D is designed to generate high - quality PWM signals, which are used to regulate the output voltage and current in various power conversion systems.

## 2. Key Features

### 2.1 Wide Input Voltage Range
The SG3524D can operate over a relatively wide input voltage range. This flexibility allows it to be used in different power supply environments, whether it is a low - voltage battery - powered system or a higher - voltage industrial power supply. For example, it can handle input voltages from a few volts up to a certain maximum value, typically around 35V, which makes it suitable for a broad spectrum of applications.

### 2.2 Adjustable Output Frequency
One of the significant features of the SG3524D is its adjustable output frequency. The frequency of the PWM signal can be easily set by an external resistor - capacitor (RC) network. This adjustability enables designers to optimize the performance of the power converter according to the specific requirements of the application. For instance, in a switching power supply, different loads may require different switching frequencies to achieve the best efficiency and performance.

### 2.3 Dual - Output Capability
The SG3524D provides dual - output PWM signals. These outputs are complementary, which means that when one output is high, the other is low. This feature is particularly useful in push - pull or half - bridge power converter topologies. In a push - pull converter, the two complementary outputs drive the two power switches alternately, allowing for efficient power transfer from the input to the output.

### 2.4 Built - in Error Amplifier
It comes with a built - in error amplifier. This amplifier compares the feedback voltage (representing the output voltage or current of the power converter) with a reference voltage. The difference between these two voltages is amplified, and the resulting error signal is used to adjust the duty cycle of the PWM output. This closed - loop control mechanism ensures that the output of the power converter remains stable and within the desired range, even when there are variations in the input voltage or load conditions.

### 2.5 Over - Current Protection
The SG3524D incorporates over - current protection functionality. It can sense the current flowing through the power switches in the converter. If the current exceeds a pre - set threshold, the controller will take appropriate action, such as reducing the duty cycle of the PWM output or shutting down the converter altogether. This protection feature helps to prevent damage to the power switches and other components in the system due to excessive current.

## 3. Applications

### 3.1 Switching Power Supplies
The SG3524D is commonly used in switching power supplies, which are widely employed in electronic devices such as computers, televisions, and mobile phone chargers. In a switching power supply, the SG3524D generates the PWM signals that control the switching of power transistors or MOSFETs. By adjusting the duty cycle of the PWM signals, the output voltage of the power supply can be regulated accurately. This results in a more efficient power conversion compared to linear power supplies, as the power switches operate in either the fully - on or fully - off state, minimizing power losses.

### 3.2 DC - DC Converters
DC - DC converters are used to convert a DC voltage from one level to another. The SG3524D can be used in both step - up (boost) and step - down (buck) DC - DC conver

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Datasheets

• SG2524, SG3524
• SG1524
• PDF 3

Partlist