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UC2844A from ST,ST Microelectronics

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UC2844A

Manufacturer: ST

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC2844A ST 1550 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC2844A is a high-performance current-mode PWM controller manufactured by STMicroelectronics.  

### **Specifications:**  
- **Input Voltage (VIN):** Up to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Current (Peak):** ±1A  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage (VREF):** 5V ±1%  
- **UVLO (Undervoltage Lockout):**  
  - Start-up Threshold: 16V (typical)  
  - Turn-off Threshold: 10V (typical)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Options:** SO-8, PDIP-8  

### **Descriptions:**  
- The UC2844A is designed for offline and DC-DC converter applications.  
- It features a trimmed oscillator for precise duty cycle control.  
- Includes a high-gain error amplifier for tight output regulation.  
- Provides current sensing and limiting for improved reliability.  

### **Features:**  
- **Current-Mode Operation:** Improves loop response and simplifies compensation.  
- **Automatic Feed-Forward Compensation:** Enhances line regulation.  
- **Latching PWM for Cycle-by-Cycle Current Limiting:** Prevents overload conditions.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Low Startup Current (≤1mA):** Enables efficient power-up.  
- **Totem-Pole Output:** Optimized for driving power MOSFETs.  

This device is commonly used in power supplies, battery chargers, and LED drivers.

Partnumber Manufacturer Quantity Availability
UC2844A LINFINITY 324 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC2844A is a high-performance current-mode PWM controller manufactured by LINFINITY.  

### **Key Specifications:**  
- **Input Voltage Range:** Up to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Current:** 1A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage:** 5V (±1%)  
- **Low Startup Current:** <1mA  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions and Features:**  
- **Current-Mode Control:** Provides improved loop response and simplified compensation.  
- **Automatic Feed-Forward Compensation:** Enhances line regulation.  
- **Pulse-by-Pulse Current Limiting:** Protects against overloads.  
- **Under-Voltage Lockout (UVLO):** Ensures proper startup and shutdown.  
- **Trimmed Oscillator Discharge Current:** Allows precise frequency control.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Totem-Pole Output:** Optimized for driving power MOSFETs.  
- **Latching PWM:** Ensures single-pulse response to faults.  

The UC2844A is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.

Partnumber Manufacturer Quantity Availability
UC2844A MOTO 89 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC2844A is a high-performance current-mode PWM controller manufactured by Motorola (MOTO). Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** Motorola (MOTO)  
- **Type:** Current-Mode PWM Controller  
- **Operating Voltage Range:** 8V to 30V  
- **Output Drive Current:** ±1A (peak)  
- **Switching Frequency:** Up to 500 kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage:** 5V (±1%)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Options:** 8-Pin DIP, SOIC  

### **Descriptions:**
- The UC2844A is designed for offline and DC-DC converter applications.  
- It provides precise control for switching power supplies with high efficiency.  
- Features include under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a trimmed oscillator.  
- It is optimized for flyback, forward, and boost converter topologies.  

### **Features:**
- **Current-Mode Operation:** Improves loop response and simplifies compensation.  
- **Automatic Feed-Forward Compensation:** Enhances line regulation.  
- **Under-Voltage Lockout (UVLO):** Ensures reliable startup and shutdown.  
- **Trimmed Oscillator:** Provides accurate frequency control.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Pulse-by-Pulse Current Limiting:** Protects against overloads.  
- **Low Startup and Operating Current:** Reduces power consumption.  

This information is based solely on the manufacturer's datasheet for the UC2844A.

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