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UC3851N from TI,Texas Instruments

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UC3851N

Manufacturer: TI

Programmable, Off-Line, PWM Controller

Partnumber Manufacturer Quantity Availability
UC3851N TI 590 In Stock

Description and Introduction

Programmable, Off-Line, PWM Controller The UC3851N is a power factor correction (PFC) controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Input Voltage Range:** Up to 600V  
- **Operating Frequency:** Adjustable (typically up to 250 kHz)  
- **Output Drive Current:** ±1.5A (peak)  
- **Supply Voltage (VCC):** 12V to 18V  
- **Power Dissipation:** 1W  
- **Package:** 8-Pin DIP (PDIP)  

### **Descriptions:**  
The UC3851N is designed for high-power PFC applications, providing average current-mode control to improve power factor and reduce harmonic distortion. It integrates a multiplier, voltage amplifier, current amplifier, and oscillator to simplify PFC circuit design.  

### **Features:**  
- **Average Current-Mode Control** for precise PFC  
- **Wide Input Voltage Range** (up to 600V)  
- **Programmable Oscillator Frequency**  
- **Soft-Start Function** for controlled startup  
- **Undervoltage Lockout (UVLO)** protection  
- **Low Distortion & High Efficiency**  
- **Multiplier for Input Voltage Feedforward**  

This IC is commonly used in AC/DC power supplies, industrial systems, and other applications requiring power factor correction.

Partnumber Manufacturer Quantity Availability
UC3851N TI 25 In Stock

Description and Introduction

Programmable, Off-Line, PWM Controller The UC3851N is a power factor correction (PFC) controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Input Voltage Range:** 15V to 35V  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** 1.5A (peak)  
- **Package:** 16-Pin PDIP (Plastic Dual In-Line Package)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Control Method:** Average Current Mode Control  
- **Features:**  
  - High-speed PWM controller  
  - Low startup current  
  - Precision reference voltage  
  - Under-voltage lockout (UVLO)  
  - Over-voltage protection  

### **Descriptions:**  
The UC3851N is designed for power factor correction in AC/DC power supplies. It provides average current mode control to ensure high power factor and low harmonic distortion. It is commonly used in boost converter topologies for PFC applications.  

### **Features:**  
- **Precision Reference:** 7.5V ±1%  
- **Low Start-Up Current:** <1mA  
- **Programmable Oscillator Frequency**  
- **Soft-Start Function**  
- **Error Amplifier with Wide Bandwidth**  
- **Current Sense and Voltage Sense Inputs**  

This IC is optimized for high-performance power supplies requiring compliance with power quality standards.  

(Source: Texas Instruments Datasheet for UC3851N)

Partnumber Manufacturer Quantity Availability
UC3851N UC 646 In Stock

Description and Introduction

Programmable, Off-Line, PWM Controller The UC3851N is a power factor correction (PFC) controller manufactured by Texas Instruments (formerly Unitrode). Below are its specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** Texas Instruments (Unitrode)
- **Type:** Power Factor Correction (PFC) Controller
- **Package:** 16-Pin PDIP (Plastic Dual In-Line Package)
- **Operating Voltage Range:** 10V to 17V
- **Maximum Supply Voltage:** 20V
- **Operating Temperature Range:** -25°C to +85°C
- **Switching Frequency:** Adjustable (typically up to 250kHz)
- **Current Sense Input:** Yes (for PFC control)
- **Voltage Error Amplifier:** Included
- **Multiplier/Divider Circuit:** Integrated for PFC operation
- **Soft-Start Function:** Yes
- **Protection Features:** Overvoltage protection (OVP), undervoltage lockout (UVLO)

### **Descriptions:**
The UC3851N is a dedicated PFC controller designed for high-power applications requiring power factor correction. It operates in average current mode control to ensure high power factor and low harmonic distortion. The IC integrates key functions such as a voltage error amplifier, multiplier/divider, and current sensing for efficient PFC operation.

### **Features:**
- **Average Current Mode Control:** Ensures high power factor (>0.99) and low THD (Total Harmonic Distortion).
- **Integrated Multiplier/Divider:** Simplifies PFC circuit design.
- **Programmable Oscillator:** Adjustable switching frequency for flexibility.
- **Soft-Start:** Reduces inrush current during startup.
- **Undervoltage Lockout (UVLO):** Ensures safe operation under low supply conditions.
- **Overvoltage Protection (OVP):** Protects against excessive output voltage.
- **Wide Operating Voltage Range:** Supports various input conditions.
- **16-Pin DIP Package:** Easy prototyping and integration.

This information is based solely on the manufacturer's datasheet and technical documentation.

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