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SG3846DW

Manufacturer: LINFINITY, MICR0SEMI, LINF, MSC

CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
SG3846DW LINFINITY, MICR0SEMI, LINF, MSC 6070 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER The SG3846DW is a pulse width modulation (PWM) controller IC manufactured by ON Semiconductor. Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Manufacturer:** ON Semiconductor  
- **Package:** SOIC-16 (DW suffix indicates the package type)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Supply Voltage (VCC):** 8V to 40V  
- **Output Current (Source/Sink):** 200mA (peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage (VREF):** 5.1V (±1%)  

### **Descriptions:**
- The SG3846DW is a fixed-frequency current-mode PWM controller designed for power supply applications.  
- It includes features for precise regulation, soft-start, and shutdown control.  
- Suitable for DC-DC converters, inverters, and offline power supplies.  

### **Features:**
- **Current-Mode Control:** Enhances loop response and simplifies compensation.  
- **Programmable Oscillator:** Allows frequency adjustment via external components.  
- **Soft-Start Function:** Reduces inrush current during startup.  
- **Error Amplifier:** Provides high gain-bandwidth for accurate regulation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within voltage limits.  
- **Dual Alternating Outputs:** Supports push-pull or half-bridge configurations.  
- **Shutdown Pin:** Allows external control for disabling the IC.  

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

Application Scenarios & Design Considerations

CURRENT MODE PWM CONTROLLER

Alternative Part Number

  • UC3846DW --: Same current-mode PWM controller function and pinout, widely available, direct functional equivalent in SOIC package.
  • UC2846DW --: Same UC3846 family controller with identical topology and pinout, slightly different UVLO thresholds but functionally interchangeable in most designs.
  • TL494CD --: General-purpose PWM controller usable as a fallback for similar power supply designs, though pinout and features differ so circuit review is required.
  • SG3525ADW --: Voltage-mode PWM controller in SOIC that can replace the SG3846DW in many applications with minor circuit adjustments, from a different series for easy distinction.
  • MC3846ADW --: Alternative current-mode PWM controller with matching function and SOIC-16 footprint, usable as a second-source substitute.

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