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FAN8741GX from FAIRCHILD,Fairchild Semiconductor

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FAN8741GX

Manufacturer: FAIRCHILD

3-Phase BLDCM + 6CH BTL Driver

Partnumber Manufacturer Quantity Availability
FAN8741GX FAIRCHILD 3340 In Stock

Description and Introduction

3-Phase BLDCM + 6CH BTL Driver The FAN8741GX is a high-voltage, high-side gate driver IC manufactured by Fairchild Semiconductor (now part of ON Semiconductor). Below are its key specifications:

1. **Voltage Range**:  
   - High-side driver voltage range: Up to 600V  
   - Bootstrap supply voltage: 10V to 20V  

2. **Output Current**:  
   - Peak source current: 350mA  
   - Peak sink current: 650mA  

3. **Switching Speed**:  
   - Rise time (typical): 80ns  
   - Fall time (typical): 40ns  

4. **Propagation Delay**:  
   - Typical: 120ns  

5. **Operating Temperature**:  
   - Range: -40°C to +125°C  

6. **Package**:  
   - 8-pin SOIC  

7. **Features**:  
   - Under-voltage lockout (UVLO) protection  
   - High noise immunity  
   - Low power consumption  

8. **Applications**:  
   - Motor drives  
   - Power supplies  
   - Inverters  

For exact details, refer to the official datasheet from Fairchild/ON Semiconductor.

Application Scenarios & Design Considerations

3-Phase BLDCM + 6CH BTL Driver# Technical Documentation: FAN8741GX High-Voltage Half-Bridge Gate Driver IC

 Manufacturer : FAIRCHILD (ON Semiconductor)
 Document Version : 1.0
 Date : October 26, 2023

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## 1. Application Scenarios

The FAN8741GX is a monolithic high-voltage, high-speed power MOSFET and IGBT driver designed for applications requiring high efficiency, robustness, and compact design. It integrates critical protection and control features into a single package.

### Typical Use Cases

*    Switch-Mode Power Supplies (SMPS):  Primarily used in half-bridge and full-bridge topologies for AC-DC power supplies, including server PSUs, telecom rectifiers, and industrial power systems. Its high-side floating channel allows it to drive the high-side N-channel MOSFET or IGBT directly.
*    Motor Drive Inverters:  Employed in variable frequency drives (VFDs) for industrial motors, appliance motor controllers (e.g., compressors, fans), and low-power traction inverters. The matched propagation delays minimize distortion in pulse-width modulation (PWM) waveforms.
*    DC-DC Converters:  Suitable for high-power isolated DC-DC converters, such as those in renewable energy systems (solar inverters) and electric vehicle auxiliary power modules.
*    Lighting Ballasts:  Used in electronic ballasts for high-intensity discharge (HID) lamps and high-power LED drivers requiring robust half-bridge switching.

### Industry Applications

*    Industrial Automation:  Motor controllers, programmable logic controller (PLC) power modules, and robotic arm drives.
*    Telecommunications:  48V rectifier modules and base station power amplifiers.
*    Consumer Electronics:  High-end gaming console power supplies, high-power audio amplifiers, and large-format TV/LCD backlight inverters.
*    Automotive:  On-board chargers (OBC) for electric vehicles and high-power DC-DC converters in 48V mild-hybrid systems (Note: Requires verification of specific AEC-Q100 qualification for automotive-grade variants).
*    Renewable Energy:  Inverters for micro-inverter systems and power optimizers in solar installations.

### Practical Advantages and Limitations

 Advantages: 
*    Integrated Bootstrap Function:  Simplifies design by eliminating the need for an external high-side supply, reducing component count and board space.
*    Robust Protection Features:  Includes under-voltage lockout (UVLO) for both channels, preventing malfunction at insufficient supply voltages. Cross-conduction prevention logic ensures dead-time to avoid shoot-through currents.
*    High Noise Immunity:  A negative voltage spike (dV/dt) rating on the floating channels enhances reliability in noisy switching environments.
*    Compact Package:  Typically offered in space-saving SOIC-8 or similar packages, ideal for high-density designs.
*    Wide Voltage Range:  Operates with a high-side floating supply voltage (VBS) up to typically 600V, suitable for universal input mains applications.

 Limitations: 
*    Peak Current Capability:  The source/sink current (typically ~200mA / ~350mA) is suitable for driving MOSFETs/IGBTs up to a certain gate charge (Qg). For very large paralleled devices or extremely high-frequency switching (>500kHz), a discrete or higher-current pre-driver stage may be necessary.
*    Thermal Management:  In high ambient temperatures or continuous high-frequency operation, the power dissipation in the driver itself must be calculated. The small package has limited thermal dissipation capability.
*    Single Functional Configuration:  It is designed specifically for half-bridge configurations. For three-phase drives, three devices are required, whereas some specialized three-phase driver ICs integrate more functionality.

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## 2. Design

Alternative Part Number

  • BD6975FV --: Three-phase motor driver IC with similar voltage and current capability, commonly used as a functional replacement for the FAN8741GX in fan motor drive applications.
  • TB6588FG --: Three-phase BLDC motor driver with comparable supply voltage range and output current, suitable as a cross-manufacturer alternative.
  • LV8805V --: Three-phase fan motor driver with integrated output stage and similar ratings, offering a different series and vendor for design flexibility.
  • LB1836M --: Dual H-bridge motor driver in a similar low-voltage range, commonly used as a drop-in replacement for FAN8741-class drivers in small motor applications.
  • DRV8833 --: Dual H-bridge motor driver with comparable current and voltage ratings, widely available and functionally similar to the FAN8741GX.
  • TB6612FNG --: Dual DC motor driver with integrated H-bridges, similar logic interface and output capability, suitable as an alternative for low-voltage motor drive designs.

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