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SG3843N

Manufacturer: SG, LINFINITY

CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
SG3843N SG, LINFINITY 254 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER The part **SG3843N** is a **PWM (Pulse Width Modulation) controller IC** manufactured by **SG Micro (SGMICRO)**. Below are its specifications, descriptions, and features based on available data:  

### **Specifications:**  
- **Manufacturer:** SG Micro (SGMICRO)  
- **Type:** Current Mode PWM Controller  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Input Voltage Range (VCC):** 8.5V to 30V  
- **Operating Frequency:** Adjustable up to 500kHz  
- **Output Duty Cycle:** Up to 50% (for push-pull applications)  
- **Reference Voltage:** 5V (±1%)  
- **Output Drive Current:** ±200mA (peak)  
- **Start-up Current:** <1mA  
- **Low Operating Current:** ~11mA (typical)  
- **Error Amplifier Bandwidth:** ~3MHz  
- **Protection Features:** Under-Voltage Lockout (UVLO), Over-Current Protection (OCP)  
- **Package:** 8-Pin DIP or SOIC  

### **Descriptions:**  
The **SG3843N** is a high-performance PWM controller designed for DC-DC converter applications. It operates in **current-mode control**, providing improved loop response and simplified feedback compensation. It is commonly used in **switching power supplies, battery chargers, and LED drivers**.  

### **Features:**  
- **Precision 5V Reference** for stable feedback control  
- **Adjustable Oscillator Frequency** via external resistor/capacitor  
- **Current Sensing Comparator** for cycle-by-cycle current limiting  
- **Soft-Start Capability** for controlled startup  
- **Under-Voltage Lockout (UVLO)** ensures proper operation  
- **Totem Pole Output** for direct MOSFET/transistor drive  
- **Low Power Consumption** for energy-efficient designs  

This IC is a functional equivalent to the **UC3843** and **TL3843** series, making it compatible with many existing designs.  

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Application Scenarios & Design Considerations

CURRENT MODE PWM CONTROLLER

Alternative Part Number

  • UC3843N --: Industry-standard current-mode PWM controller in the same family with nearly identical functionality and pinout, widely available and directly interchangeable in most designs.
  • TL3843P --: Pin-compatible current-mode PWM controller with equivalent electrical characteristics, suitable as a drop-in replacement in DIP-8 packages.
  • KA3843 --: Equivalent current-mode PWM controller offering the same operating principle and pin configuration, usable as an alternative with minor design verification.
  • UC3843AN --: Industry-standard current-mode PWM controller in the same family with nearly identical electrical characteristics and DIP-8 pinout; widely available and well documented.
  • KA3843B --: Compatible current-mode PWM controller offering the same control scheme and DIP-8 pin configuration, usable as an alternative with minor design verification.

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