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UC3844D1 from FAI,Fairchild Semiconductor

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UC3844D1

Manufacturer: FAI

SMPS Controller

Partnumber Manufacturer Quantity Availability
UC3844D1 FAI 190 In Stock

Description and Introduction

SMPS Controller The UC3844D1 is a high-performance current-mode PWM controller manufactured by FAI (Fairchild Semiconductor). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**  
- **Manufacturer:** FAI (Fairchild Semiconductor)  
- **Type:** Current-Mode PWM Controller  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Operating Voltage Range:** 7.6V to 30V  
- **Output Drive Current:** ±1A (Peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 50% (Adjustable)  
- **Reference Voltage:** 5V ±1%  
- **Current Sense Threshold:** 1V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SOIC-8 (D1 suffix indicates package type)  

### **Descriptions:**  
The UC3844D1 is a fixed-frequency PWM controller designed for DC-DC converter applications. It provides precise regulation through current-mode control, improving loop response and simplifying compensation. It includes features like under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a trimmed oscillator for accurate frequency control.  

### **Features:**  
- **Current-Mode Operation:** Enhances transient response and simplifies feedback loop design.  
- **Under-Voltage Lockout (UVLO):** Ensures proper startup and shutdown.  
- **Trimmed Oscillator:** Provides precise frequency control.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.  
- **Low Startup Current:** Typically 0.5mA.  
- **Soft-Start Capability:** Reduces inrush current.  

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

Partnumber Manufacturer Quantity Availability
UC3844D1 F 10 In Stock

Description and Introduction

SMPS Controller The UC3844D1 is a high-performance current-mode PWM controller manufactured by Texas Instruments. Below are its specifications, descriptions, and features based on factual information:

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V  
- **Output Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Peak Output Current:** ±1A (sink/source)  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Type:** SOIC-8  

### **Descriptions:**  
The UC3844D1 is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications. It provides precise voltage regulation with current-mode control, enhancing loop stability and transient response. The device includes an oscillator, error amplifier, current-sensing comparator, and a totem-pole output stage for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Control:** Improves loop response and simplifies compensation.  
- **Adjustable Oscillator Frequency:** Set by external timing components.  
- **Undervoltage Lockout (UVLO):** Ensures reliable startup with hysteresis.  
- **Cycle-by-Cycle Current Limiting:** Enhances system protection.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Low Startup Current:** Typically 0.5mA.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  

The UC3844D1 is commonly used in offline and DC-DC power supplies, battery chargers, and flyback converters.  

(Note: All details are sourced from the manufacturer's datasheet.)

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