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UC2845DR2 from TI,Texas Instruments

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UC2845DR2

Manufacturer: TI

High Performance Current Mode Controllers

Partnumber Manufacturer Quantity Availability
UC2845DR2 TI 2420 In Stock

Description and Introduction

High Performance Current Mode Controllers The UC2845DR2 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Input Voltage Range (VCC):** 7.6V to 30V  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** ±1A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** 1 MHz  
- **Start-Up Current:** <1 mA  
- **Undervoltage Lockout (UVLO):** 7.6V (on), 7.2V (off)  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC2845DR2 is designed for offline and DC-DC converter applications, providing precise control of switching power supplies. It features a trimmed oscillator for accurate duty cycle control, a temperature-compensated reference, and high-gain error amplifier.  

### **Features:**  
- **Current-Mode Operation:** Improves loop response and simplifies compensation.  
- **Automatic Feed-Forward Compensation:** Enhances line regulation.  
- **Pulse-by-Pulse Current Limiting:** Provides cycle-by-cycle protection.  
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Internal Soft-Start:** Reduces inrush current during start-up.  
- **Latching PWM for Overvoltage Protection:** Prevents damage during faults.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  

This device is commonly used in power supply designs, including flyback, forward, and boost converters.

Partnumber Manufacturer Quantity Availability
UC2845DR2 ON 10000 In Stock

Description and Introduction

High Performance Current Mode Controllers The UC2845DR2 is a high-performance current-mode PWM controller manufactured by ON Semiconductor.  

### **Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Input Voltage (VCC):** 7V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Drive Current:** ±1A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage (VREF):** 5V (±1%)  
- **Low Startup Current:** <1mA  
- **UVLO (Undervoltage Lockout):** On: 8.4V (typ), Off: 7.6V (typ)  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC2845DR2 is designed for offline and DC-DC converter applications, providing precise control of switching power supplies. It features high-speed operation, cycle-by-cycle current limiting, and automatic feed-forward compensation.  

### **Features:**  
- **Current-Mode Control:** Improves loop response and simplifies compensation.  
- **Programmable Oscillator:** Allows frequency adjustment with external components.  
- **Soft-Start Capability:** Reduces startup stress.  
- **Pulse-by-Pulse Current Limiting:** Enhances system protection.  
- **Under-Voltage Lockout (UVLO):** Ensures proper startup and shutdown.  
- **Totem Pole Output:** Optimized for driving power MOSFETs.  

This device is widely used in power supply designs for industrial, telecom, and consumer electronics.

Partnumber Manufacturer Quantity Availability
UC2845DR2 MOT 6846 In Stock

Description and Introduction

High Performance Current Mode Controllers The UC2845DR2 is a high-performance current-mode PWM controller manufactured by Texas Instruments (formerly Unitrode).  

### **Manufacturer:**  
- **MOT (Motorola)** – The UC2845DR2 was originally designed by Unitrode, which was later acquired by Texas Instruments. Motorola (MOT) was also involved in semiconductor manufacturing and may have produced equivalent or related parts.  

### **Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** ±1A (peak)  
- **Supply Voltage Range:** 8V to 30V  
- **Duty Cycle Range:** 0% to 100% (adjustable)  
- **Error Amplifier Bandwidth:** 1 MHz  
- **Soft-Start Capability:** Yes (external capacitor programmable)  
- **Undervoltage Lockout (UVLO):** 8V (on) / 7.6V (off)  
- **Package:** SOIC-8  

### **Descriptions and Features:**  
- **Current-Mode Control:** Provides cycle-by-cycle current limiting for improved transient response.  
- **Automatic Feed-Forward Compensation:** Simplifies loop stabilization.  
- **Latching PWM:** Ensures single-pulse operation per cycle.  
- **Internal Trimmed Bandgap Reference:** 5V ±1% accuracy.  
- **Low Start-Up Current:** Typically <1 mA.  
- **High-Current Totem Pole Output:** Suitable for driving power MOSFETs directly.  
- **Pulse-by-Pulse Current Limiting:** Enhances system reliability.  

This IC is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.

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