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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.

Application Scenarios & Design Considerations

SMPS Controller
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.

Application Scenarios & Design Considerations

SMPS Controller
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.

Application Scenarios & Design Considerations

SMPS Controller

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