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LT1242IN8

High Speed Current Mode Pulse Width Modulators

Partnumber Manufacturer Quantity Availability
LT1242IN8 23 In Stock

Description and Introduction

High Speed Current Mode Pulse Width Modulators The LT1242IN8 is a power factor correction (PFC) controller IC manufactured by Linear Technology (now part of Analog Devices).  

### **Key Specifications:**  
- **Input Voltage Range:** 4.5V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Drive Current:** ±1A (peak)  
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions and Features:**  
- Designed for **active power factor correction** in AC/DC power supplies.  
- Uses **average current mode control** for precise input current shaping.  
- Includes **overvoltage protection (OVP)** and **undervoltage lockout (UVLO)**.  
- **Low start-up current** (typically 150µA).  
- **Zero current detection** for discontinuous conduction mode (DCM) operation.  
- **Programmable oscillator frequency** with external resistor and capacitor.  
- **High noise immunity** due to internal leading-edge blanking.  

This IC is commonly used in **switch-mode power supplies (SMPS)** to improve power efficiency and comply with regulatory standards.

Application Scenarios & Design Considerations

High Speed Current Mode Pulse Width Modulators
Partnumber Manufacturer Quantity Availability
LT1242IN8 LT 78 In Stock

Description and Introduction

High Speed Current Mode Pulse Width Modulators The LT1242IN8 is a power factor correction (PFC) controller manufactured by Linear Technology (now part of Analog Devices).  

### **Specifications:**  
- **Input Voltage Range:** 4.5V to 30V  
- **Operating Frequency:** Up to 200kHz  
- **Output Drive Current:** ±1A (peak)  
- **Power Factor Correction:** >0.99  
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The LT1242IN8 is designed for active power factor correction in AC/DC power supplies. It provides high power factor and low harmonic distortion by controlling a boost converter to shape the input current waveform.  

### **Features:**  
- **Average Current Mode Control:** Ensures low distortion and high power factor.  
- **Precision Reference:** 2.5V ±1% for accurate regulation.  
- **Low Start-Up Current:** 150µA typical.  
- **Undervoltage Lockout (UVLO):** Ensures proper operation under low-voltage conditions.  
- **Overvoltage Protection:** Prevents damage due to excessive output voltage.  
- **Zero Current Detection:** Optimizes efficiency at light loads.  

This IC is commonly used in power supplies, LED drivers, and industrial applications requiring high-efficiency power factor correction.

Application Scenarios & Design Considerations

High Speed Current Mode Pulse Width Modulators

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