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UC3844P

Current Mode PWM Controller

Partnumber Manufacturer Quantity Availability
UC3844P 19 In Stock

Description and Introduction

Current Mode PWM Controller The UC3844P is a high-performance current-mode PWM controller manufactured by Texas Instruments and other semiconductor companies. Here are its key specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 8V to 30V (operating), 7.6V (UVLO turn-on), 7.2V (UVLO turn-off)  
- **Output Current:** Up to 1A (peak)  
- **Switching Frequency:** Up to 500kHz (adjustable with external components)  
- **Duty Cycle Range:** 0% to 50% (internally clamped)  
- **Error Amplifier Gain Bandwidth:** 1MHz  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin DIP (PDIP)  

### **Descriptions:**  
- The UC3844P is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter applications.  
- It operates in current-mode control, providing improved loop response and simplified feedback compensation.  
- Includes an onboard oscillator, error amplifier, current sensing comparator, and a totem-pole output driver.  
- Features under-voltage lockout (UVLO) protection to ensure proper startup and shutdown.  

### **Features:**  
- **Current-Mode Control:** Enhances transient response and simplifies feedback loop design.  
- **Precision Reference:** 5V ±1% trimmed bandgap reference for stable regulation.  
- **Cycle-by-Cycle Current Limiting:** Protects against overcurrent conditions.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Low Startup Current:** Typically 0.5mA for efficient power-up.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  
- **Adjustable Frequency:** Set via external resistor and capacitor.  

The UC3844P is commonly used in offline and DC-DC power supplies, battery chargers, and flyback converters.

Partnumber Manufacturer Quantity Availability
UC3844P TI 50 In Stock

Description and Introduction

Current Mode PWM Controller The UC3844P is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Input Voltage (VCC):** 8.5V to 30V  
- **Operating Frequency:** Up to 500 kHz  
- **Output Current (Peak):** 1A (source/sink)  
- **Duty Cycle Range:** 0% to 50% (adjustable)  
- **Reference Voltage (VREF):** 5V (±1% accuracy)  
- **Current Sense Comparator Threshold:** 1V  
- **Under-Voltage Lockout (UVLO):** 8.4V (on), 7.6V (off)  
- **Package:** 8-Pin DIP (PDIP) or SOIC  

### **Descriptions:**  
The UC3844P is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications. It features current-mode control for improved loop response and includes an internal oscillator, error amplifier, and a high-current totem-pole output for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Control:** Enhances line and load regulation.  
- **Precision 5V Reference:** Stable for feedback control.  
- **Adjustable Oscillator Frequency:** Set by external components.  
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.  
- **Soft-Start Capability:** Reduces inrush current.  
- **Low Startup Current:** Typically 0.5mA.  
- **High Noise Immunity:** Robust operation in noisy environments.  

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

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