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SG3845D from MSC

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SG3845D

Manufacturer: MSC, LINFINITY

CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
SG3845D MSC, LINFINITY 1254 In Stock

Description and Introduction

CURRENT MODE PWM CONTROLLER The SG3845D is a pulse width modulation (PWM) controller IC manufactured by MSC (Microsemi Corporation). Below are the factual details about its specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 8V to 30V  
- **Operating Frequency Range:** Up to 500 kHz  
- **Output Duty Cycle Range:** 0% to 100%  
- **Maximum Output Current:** 200 mA (sink/source)  
- **Reference Voltage:** 5.1V (±1%)  
- **Quiescent Current:** 11 mA (typical)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Type:** PDIP-16, SOIC-16  

### **Descriptions:**  
- The SG3845D is a fixed-frequency current-mode PWM controller.  
- It is designed for DC-DC converter and power supply applications.  
- The device includes an oscillator, error amplifier, current sensing comparator, and totem-pole output driver.  
- It provides precise control for switching power supplies with adjustable frequency and duty cycle.  

### **Features:**  
- **Current-Mode Operation:** Improves loop response and simplifies compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within the input voltage range.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Programmable Oscillator:** Allows frequency adjustment with external components.  
- **Error Amplifier:** Provides high gain-bandwidth for feedback control.  
- **Totem-Pole Output:** Capable of driving MOSFETs or bipolar transistors.  
- **Pulse-by-Pulse Current Limiting:** Enhances system protection.  

This information is based on the manufacturer's datasheet for the SG3845D.

Application Scenarios & Design Considerations

CURRENT MODE PWM CONTROLLER

Alternative Part Number

  • UC3845BD1 --: Industry-standard current-mode PWM controller in the same 3845 family with identical function and pinout, widely available and well documented.
  • KA3845 --: Direct functional equivalent of the 3845 current-mode controller, commonly used as a drop-in replacement in SMPS designs.
  • TL3845P --: Alternative 3845-series PWM controller offering comparable electrical characteristics and compatibility with the original application.
  • TL3845D-8 --: Direct functional equivalent of the 3845 current-mode controller in SOIC-8, well-documented and readily stocked.
  • KA3845D --: Pin-compatible 3845-series current-mode PWM controller in SOIC-8, suitable drop-in replacement with similar electrical characteristics.

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