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SG3843N

CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
SG3843N 16 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER The part **SG3843N** is a **PWM (Pulse Width Modulation) Controller IC** manufactured by **ON Semiconductor** (formerly part of **STMicroelectronics**). Below are its key specifications, descriptions, and features:  

### **Manufacturer:**  
- **ON Semiconductor**  

### **Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Operating Frequency:** Up to **500 kHz**  
- **Output Duty Cycle:** Adjustable, typically **0% to 100%**  
- **Input Voltage Range (VCC):** **8.4V to 30V** (start-up voltage ~16V)  
- **Output Drive Current:** **±200 mA (peak)**  
- **Reference Voltage:** **5.1V (±1%)**  
- **Error Amplifier Gain Bandwidth:** **1 MHz**  
- **Operating Temperature Range:** **-40°C to +85°C**  
- **Package:** **8-Pin DIP (Dual In-line Package)**  

### **Descriptions:**  
- Designed for **offline and DC-DC converter applications**  
- Features **current-mode control** for improved transient response  
- Includes **undervoltage lockout (UVLO), soft-start, and pulse-by-pulse current limiting**  
- Suitable for **flyback, forward, and boost converters**  

### **Key Features:**  
- **Precision 5.1V reference voltage**  
- **Automatic feed-forward compensation**  
- **Latching PWM for cycle-by-cycle current limiting**  
- **Low startup and operating current**  
- **Synchronizable oscillator**  
- **Internal trimming for reduced part-to-part variation**  

This IC is commonly used in **switching power supplies, battery chargers, and industrial power systems**.  

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Application Scenarios & Design Considerations

CURRENT MODE PWM CONTROLLER
Partnumber Manufacturer Quantity Availability
SG3843N SG 130 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
Partnumber Manufacturer Quantity Availability
SG3843N LINFINITY 108 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER The part **SG3843N** is manufactured by **LINFINITY**. Below are the factual specifications, descriptions, and features based on available information:  

### **Specifications:**  
- **Type:** Current Mode PWM Controller  
- **Package:** DIP-8  
- **Operating Voltage Range:** 8.5V to 30V  
- **Output Frequency:** Adjustable up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Output Current (Peak):** 1A  
- **Reference Voltage:** 5V (±1%)  
- **Operating Temperature Range:** -20°C to +85°C  

### **Descriptions:**  
- The **SG3843N** is a fixed-frequency current-mode PWM controller designed for DC-DC converter applications.  
- It features an oscillator, error amplifier, current sensing comparator, and a totem-pole output stage.  
- Suitable for power supply designs requiring high efficiency and precise regulation.  

### **Features:**  
- **Current-Mode Control:** Improves loop response and simplifies compensation.  
- **Adjustable Frequency:** Allows optimization for efficiency and component size.  
- **Undervoltage Lockout (UVLO):** Ensures proper startup and shutdown behavior.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Pulse-by-Pulse Current Limiting:** Enhances system protection.  

For exact performance characteristics, refer to the official **LINFINITY datasheet**.

Application Scenarios & Design Considerations

CURRENT MODE PWM CONTROLLER

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