SG2525
16-pin voltage mode PWM controller ICs for power supply regulation
Manufacturer： ['stm', 'microsemi']
series introduction
# Introduction to the SG2525 Product Series
## 1. Overview
The SG2525 product series is a highly versatile and widely - used family of integrated circuits (ICs) primarily designed for pulse - width modulation (PWM) control applications. These ICs play a crucial role in power electronics, enabling efficient and precise control of power converters, motor drives, and other systems that require variable - duty - cycle pulse signals.
## 2. Key Features
### 2.1 Precise PWM Control
- The SG2525 offers accurate control over the pulse - width of the output signals. It can generate PWM signals with a wide range of duty cycles, typically from 0% to 100% (although in practical applications, the effective range may be slightly less due to internal circuit limitations). This precise control is essential for applications such as switching power supplies, where the duty cycle determines the output voltage or current.
- It has a built - in error amplifier that compares the feedback signal from the output of the power system with a reference voltage. Based on this comparison, the error amplifier adjusts the PWM duty cycle to maintain the desired output parameters.
### 2.2 Adjustable Oscillator
- The oscillator in the SG2525 is highly adjustable. By simply changing the values of an external resistor and capacitor, the user can set the operating frequency of the PWM signals. This flexibility allows the SG2525 to be used in a variety of applications with different frequency requirements. For example, in low - power applications, a lower frequency may be preferred to reduce switching losses, while in high - power or high - speed applications, a higher frequency can be selected.
- The oscillator frequency can typically be adjusted in the range of a few kilohertz to several hundred kilohertz, making it suitable for a wide spectrum of power electronics designs.
### 2.3 Dual Outputs
- The SG2525 provides two complementary output signals. These outputs are designed to drive external power switches, such as MOSFETs or IGBTs, in a push - pull or half - bridge configuration. The complementary nature of the outputs ensures that the power switches are turned on and off in an alternating manner, which is essential for efficient power conversion.
- The output signals have sufficient drive capability to directly drive small - to medium - sized power switches, reducing the need for additional buffer circuits in many applications.
### 2.4 Protection Features
- **Over - current Protection**: The SG2525 includes an over - current protection mechanism. It can sense the current flowing through the power circuit and, if the current exceeds a pre - set threshold, it will automatically reduce the PWM duty cycle or shut down the outputs to protect the power switches and other components from damage.
- **Under - voltage Lockout**: There is an under - voltage lockout feature that ensures the IC operates only when the supply voltage is within a safe and specified range. If the supply voltage drops below the lockout threshold, the SG2525 will disable its outputs, preventing improper operation and potential damage to the system.
## 3. Applications
### 3.1 Switching Power Supplies
- In both offline and DC - DC switching power supplies, the SG2525 is used to control the power transistors or MOSFETs. By adjusting the PWM duty cycle, it can regulate the output voltage of the power supply to a constant value, regardless of changes in the input voltage or load current. For example, in a laptop power adapter, the SG2525 helps convert the high - voltage AC input from the wall outlet to a stable low - voltage DC output for the laptop.
### 3.2 Motor Drives
- For DC motor drives, the SG2525 can be used to control the speed of the
Images for reference
sg2525adw
16 SOIC
16-DIP SOT38-1