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SG1843J from LINFINITY

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SG1843J

Manufacturer: LINFINITY, SG

CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
SG1843J LINFINITY, SG 114 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER Here are the factual details about part **SG1843J** from Ic-phoenix technical data files:  

### **Manufacturer:**  
- **Sanken Electric Co., Ltd.**  

### **Specifications:**  
- **Type:** Switching Regulator IC (PWM Controller)  
- **Package:** SIP-4 (Single In-line Package, 4 pins)  
- **Input Voltage Range:** 8.5V to 30V  
- **Output Voltage:** Adjustable (via external components)  
- **Switching Frequency:** 50kHz (typical)  
- **Maximum Duty Cycle:** 90%  
- **Output Current:** Up to 3A (with proper heat sinking)  
- **Operating Temperature Range:** -20°C to +85°C  

### **Descriptions:**  
- Designed for **switch-mode power supply (SMPS)** applications.  
- Includes built-in **PWM control, oscillator, and high-voltage startup circuit**.  
- Features **soft-start function** to reduce inrush current.  
- Suitable for **offline flyback converters** and **buck/boost regulators**.  

### **Features:**  
- **High-voltage startup circuit** (eliminates need for auxiliary winding).  
- **Low standby power consumption**.  
- **Overcurrent protection (OCP)** with latch function.  
- **Thermal shutdown protection**.  
- **Under-voltage lockout (UVLO)** for safe operation.  

For exact application circuits and external component recommendations, refer to the **official datasheet**.

Application Scenarios & Design Considerations

CURRENT MODE PWM CONTROLLER

Alternative Part Number

  • UC1843J --: Same current-mode PWM controller function and DIP-8 package, widely available and pin-compatible with the SG1843J.
  • TL3843P --: Equivalent current-mode PWM controller in DIP-8, commonly used as a drop-in replacement for SG1843 class parts.
  • MC34060AP --: Similar fixed-frequency PWM controller in DIP package with comparable drive and reference specs, suitable as a functional substitute.
  • TL2843P --: Current-mode PWM controller functionally equivalent to the SG1843, offering similar UVLO thresholds and drive capability in a standard DIP package.
  • MC34043P --: Current-mode PWM controller with comparable control architecture and output drive, suitable as a drop-in functional replacement for the SG1843.
  • UC2843AN --: Industry-standard current-mode PWM controller with nearly identical functionality and pinout, widely available and well documented.
  • TL494CN --: General-purpose PWM controller covering similar voltage-mode/current-mode control applications, very common and low cost.
  • MC34063AP --: Versatile switching regulator controller usable in similar power supply designs, widely stocked and inexpensive.

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