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UC3845DX from FSC,Fairchild Semiconductor

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UC3845DX

Manufacturer: FSC

SMPS Controller

Partnumber Manufacturer Quantity Availability
UC3845DX FSC 21000 In Stock

Description and Introduction

SMPS Controller The UC3845DX is a high-performance current-mode PWM controller manufactured by FSC (Fairchild Semiconductor Corporation).  

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V  
- **Output Duty Cycle:** Up to 100%  
- **Operating Frequency:** Up to 500kHz  
- **Output Current (Peak):** ±1A  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Low Startup Current:** <1mA  
- **Undervoltage Lockout (UVLO):** 8.4V (on) / 7.6V (off)  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3845DX is designed for offline and DC-to-DC converter applications. It provides precise duty cycle control with current-mode operation, improving loop response and simplifying compensation.  

### **Features:**  
- **Current-Mode Control:** Enhances line and load regulation.  
- **Automatic Feed-Forward Compensation:** Improves input voltage response.  
- **Pulse-by-Pulse Current Limiting:** Enhances system reliability.  
- **Internal Trimmed Bandgap Reference:** Ensures stable 5V output.  
- **Latching PWM for Cycle-by-Cycle Limiting:** Prevents overload conditions.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  

This information is based on the manufacturer's datasheet.

Partnumber Manufacturer Quantity Availability
UC3845DX FAIRCHILD 2190 In Stock

Description and Introduction

SMPS Controller The UC3845DX is a high-performance current-mode PWM controller manufactured by FAIRCHILD. Below are its specifications, descriptions, and features based on factual information:  

### **Specifications:**  
- **Input Voltage (VCC):** 8.5V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Duty Cycle:** 0% to 100%  
- **Output Current (Peak):** ±1A (source/sink)  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Start-up Current:** <1mA  
- **Undervoltage Lockout (UVLO):** 8.4V (on), 7.6V (off)  
- **Package Type:** SOIC-8  

### **Descriptions:**  
The UC3845DX is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter and offline power supply applications. It operates in current-mode control, providing precise regulation and improved loop response. The device includes an oscillator, error amplifier, current sensing comparator, and a high-current totem-pole output driver.  

### **Features:**  
- **Current-Mode Operation:** Enhances loop response and simplifies compensation.  
- **Automatic Feed-Forward Compensation:** Improves line regulation.  
- **Pulse-by-Pulse Current Limiting:** Protects against overcurrent conditions.  
- **Latching PWM for Cycle-by-Cycle Limiting:** Prevents multiple pulses under fault conditions.  
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  
- **Low Start-up and Operating Current:** Reduces power consumption.  
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.  

This information is strictly based on the manufacturer's datasheet for the UC3845DX by FAIRCHILD.

Partnumber Manufacturer Quantity Availability
UC3845DX FAIRCH 21000 In Stock

Description and Introduction

SMPS Controller The UC3845DX is a high-performance current-mode PWM controller manufactured by FAIRCH. Below are its specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V  
- **Output Duty Cycle:** 0% to 100%  
- **Switching Frequency:** Up to 500kHz  
- **Output Current (Source/Sink):** 200mA (peak)  
- **Reference Voltage Accuracy:** ±1%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Type:** SOIC-8  

### **Descriptions:**  
The UC3845DX is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter applications. It operates in current-mode control, providing precise regulation and improved 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:** Enhances loop response and simplifies compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within the input voltage range.  
- **Adjustable Oscillator Frequency:** Allows flexibility in design.  
- **Cycle-by-Cycle Current Limiting:** Protects against overcurrent conditions.  
- **Single-Ended Output:** Directly drives power MOSFETs.  
- **Low Startup Current:** Reduces power consumption during startup.  
- **High Gain Error Amplifier:** Ensures accurate voltage regulation.  

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

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