UC2843BD1R2G
Current mode PWM controllers for boost and flyback applications
Manufacturer： ['rochester', 'onsemi', 'lrc']
series introduction
# Introduction to the UC2843BD1R2G Product Series
## 1. Overview
The UC2843BD1R2G belongs to a family of highly integrated pulse - width modulation (PWM) controllers. These controllers are specifically designed for use in switch - mode power supplies (SMPS), which are widely employed in various electronic devices to efficiently convert and regulate electrical power. The UC2843BD1R2G offers a comprehensive set of features that make it a popular choice among power supply designers, enabling them to create reliable, high - performance power solutions.
## 2. Key Features
### 2.1. Wide Input Voltage Range
One of the significant advantages of the UC2843BD1R2G is its ability to operate over a wide input voltage range. This flexibility allows it to be used in different power supply applications, whether it's a low - voltage system or a high - voltage industrial setup. It can handle input voltages that can vary significantly, providing stable operation even in environments with fluctuating power sources.
### 2.2. Adjustable Output Voltage
The output voltage of the power supply can be easily adjusted using the UC2843BD1R2G. Designers can set the desired output voltage according to the requirements of the load. This adjustability is crucial as different electronic devices have different voltage needs, and the ability to fine - tune the output voltage ensures compatibility and optimal performance.
### 2.3. Current - Mode Control
The UC2843BD1R2G utilizes current - mode control, which offers several benefits. Current - mode control provides better line and load regulation compared to voltage - mode control. It also simplifies the design of the power supply's compensation network. By directly sensing the inductor current, the controller can quickly respond to changes in the load or input voltage, ensuring stable and efficient operation.
### 2.4. Built - in Oscillator
It comes with a built - in oscillator that can be easily configured. The oscillator frequency can be adjusted by simply changing an external resistor and capacitor. This allows designers to optimize the switching frequency of the power supply according to factors such as efficiency, size, and electromagnetic interference (EMI) requirements. A higher switching frequency can reduce the size of the passive components in the power supply, while a lower frequency may improve efficiency in some cases.
### 2.5. Under - Voltage Lockout (UVLO)
The UC2843BD1R2G is equipped with an under - voltage lockout feature. This function ensures that the controller does not start operating until the input voltage reaches a certain minimum level. Once the input voltage drops below the UVLO threshold during operation, the controller shuts down to protect the power supply and the connected load from potential damage due to insufficient power.
### 2.6. Over - Current Protection
To safeguard the power supply and the load from excessive current, the UC2843BD1R2G has built - in over - current protection. When the current in the power supply exceeds a predefined limit, the controller reduces the duty cycle of the PWM signal or shuts down the power supply altogether. This protects the components from overheating and potential failure.
## 3. Applications
### 3.1. Consumer Electronics
In consumer electronics such as laptops, tablets, and mobile phone chargers, the UC2843BD1R2G can be used to design efficient and compact power supplies. Its ability to provide stable output voltage and handle different input voltages makes it suitable for these devices, which often need to operate from various power sources, including wall adapters and USB ports.
### 3.2. Industrial Equipment
Industrial equipment requires reliable and high - performance power supplies. The UC2843BD1R2G can
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