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UC2856DW from UNITRODE

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15.625ms

UC2856DW

Manufacturer: UNITRODE

Improved Current Mode PWM Controller

Partnumber Manufacturer Quantity Availability
UC2856DW UNITRODE 1101 In Stock

Description and Introduction

Improved Current Mode PWM Controller The UC2856DW is a high-speed PWM controller manufactured by UNITRODE.  

### **Specifications:**  
- **Manufacturer:** UNITRODE  
- **Type:** High-speed PWM controller  
- **Package:** SOIC-16 (DW)  
- **Operating Voltage Range:** Typically 8V to 35V  
- **Switching Frequency:** Adjustable up to 1MHz  
- **Output Drive:** Totem-pole output (suitable for driving MOSFETs)  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** High-speed response  
- **Protection Features:** Under-voltage lockout (UVLO), soft-start capability  

### **Descriptions and Features:**  
- Designed for high-frequency switching power supply applications.  
- Includes an onboard oscillator with adjustable frequency.  
- Features a precision reference voltage for stable operation.  
- Provides current-mode control for improved transient response.  
- Includes a shutdown function for power-saving modes.  
- Suitable for DC-DC converters, inverters, and offline power supplies.  

(Note: For exact electrical characteristics, refer to the official UNITRODE datasheet.)

Partnumber Manufacturer Quantity Availability
UC2856DW TI 296 In Stock

Description and Introduction

Improved Current Mode PWM Controller The UC2856DW is a Power Factor Correction (PFC) controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Input Voltage Range:** 8V to 17V  
- **Operating Frequency:** Up to 500kHz  
- **Output Drive Current:** ±1.5A (peak)  
- **Supply Current:** 15mA (typical)  
- **Package:** SOIC-16 (DW)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The UC2856DW is a high-performance PFC controller designed for active power factor correction in AC/DC power supplies. It features a boost converter topology and includes a multiplier/divider circuit for accurate power factor correction.  

### **Features:**  
- **Average Current Mode Control** for improved noise immunity  
- **Programmable Switching Frequency**  
- **Overvoltage Protection (OVP)**  
- **Undervoltage Lockout (UVLO)**  
- **Soft-Start Function**  
- **Low Distortion, High Power Factor (>0.99)**  
- **Peak Current Limiting**  

This device is commonly used in applications such as power supplies, industrial systems, and consumer electronics requiring efficient power factor correction.

Partnumber Manufacturer Quantity Availability
UC2856DW TI/UNITRODE 12 In Stock

Description and Introduction

Improved Current Mode PWM Controller The UC2856DW is a high-performance PWM controller manufactured by Texas Instruments (TI) under the UNITRODE brand.  

**Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Input Voltage Range:** 8.5V to 35V  
- **Operating Frequency:** Up to 1MHz  
- **Output Drive Current:** ±1.5A peak  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** 5MHz  
- **Start-Up Current:** 0.5mA (typical)  
- **Package:** SOIC-16 (DW)  

**Descriptions and Features:**  
- Designed for high-frequency switching power supplies  
- Includes a precision voltage reference (±1%)  
- Features cycle-by-cycle current limiting  
- Integrated soft-start functionality  
- Under-voltage lockout (UVLO) protection  
- Low power consumption in standby mode  
- Compatible with voltage-mode or current-mode control  
- Suitable for flyback, forward, and boost converters  

The UC2856DW is commonly used in AC/DC and DC/DC power supply applications.

Partnumber Manufacturer Quantity Availability
UC2856DW UC 446 In Stock

Description and Introduction

Improved Current Mode PWM Controller The UC2856DW is a high-performance, BiCMOS power factor correction (PFC) controller manufactured by Texas Instruments.  

### **Specifications:**  
- **Input Voltage Range:** 10V to 17V (operating)  
- **Output Voltage Range:** Adjustable (typically used for PFC applications)  
- **Switching Frequency:** Programmable up to 250kHz  
- **Maximum Duty Cycle:** 95%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SOIC-16 (DW)  

### **Descriptions:**  
- Designed for boost-type power factor correction (PFC) circuits.  
- Features average current mode control for improved efficiency.  
- Includes a precision voltage reference (5V ±1%).  
- Provides soft-start functionality for controlled startup.  
- Supports both voltage and current feedback loops.  

### **Features:**  
- **BiCMOS Technology:** Low power consumption.  
- **Programmable Oscillator:** Adjustable frequency for design flexibility.  
- **Overvoltage Protection (OVP):** Prevents excessive output voltage.  
- **Undervoltage Lockout (UVLO):** Ensures proper startup conditions.  
- **Peak Current Limiting:** Protects against overloads.  
- **Low Startup Current:** Reduces power dissipation.  

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

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