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FAN6921
FAN6921: A highly efficient half-bridge PWM controller for SMPS.
FAN6921
FAN6921: A highly efficient half-bridge PWM controller for SMPS.
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FAN6921 DataSheet
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Details
The FAN6921 is a High-Voltage Green-Mode PWM Controller designed for applications requiring high efficiency and low standby power consumption. It operates with an input voltage range of 85V to 265V and is capable of providing up to 15W of output power. This controller features a built-in 700V power MOSFET and a high-voltage startup circuit, making it suitable for off-line power supplies, LED lighting, and other low-power applications. It supports both primary-side and secondary-side feedback control modes, offering flexibility in design.The FAN6921 incorporates a Green-Mode function that provides burst-mode operation for reducing standby power consumption and improving overall efficiency. It also includes multiple protection features such as overvoltage protection, overcurrent protection, and overload protection to ensure system reliability.In terms of package options, the FAN6921 is available in a compact 8-pin SOP package, making it suitable for space-constrained applications. Additionally, it meets international safety standards such as UL, CE, and RoHS compliance, ensuring the safety and reliability of the end product.
Key Features
- Integrated high voltage startup circuit
- Programmable frequency modulation function
- Optimized for EMI performance
- Overvoltage protection
- Overcurrent protection
- Open feedback protection
- Internal thermal shutdown protection
- Adjustable brown-in and brown-out voltages
- Soft start function
Application
- LED lighting
- Switching Power Supplies
- Motor Control
- DC-DC Converters
- Battery Chargers
- Industrial Control Systems
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
| Product Category ! | IC Chips |
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is FAN6921?
The FAN6921 is a high-performance, half-bridge driver IC designed for power conversion applications such as switch-mode power supplies and DC-DC converters. It is manufactured by Fairchild Semiconductor, now part of ON Semiconductor. The FAN6921 integrates a high-side and a low-side gate driver with a bootstrap diode and a comprehensive set of protection features, making it a compact and reliable solution for power management.
How Does FAN6921 Work?
The FAN6921 works by providing the necessary drive signals to control the high-side and low-side power MOSFETs in a half-bridge configuration. It utilizes a bootstrap circuit to provide the required gate drive voltage for the high-side MOSFET, enabling efficient switching operation. The device includes features such as programmable dead time, under-voltage lockout (UVLO), and over-current protection to ensure safe and reliable operation.
How Many Pins does FAN6921 have and What are the Functions of the Pinout Configuration?
The FAN6921 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:
- VDD: Power supply pin for the IC.
- VBS: Bootstrap supply voltage pin for the high-side gate driver.
- HO: High-side gate driver output.
- LO: Low-side gate driver output.
- SEN: PWM input for setting the dead time and providing over-current protection.
- SD: Shutdown pin for enabling/disabling the device.
- COM: Ground/common pin.
- VB: Bootstrap diode pin.
What are the Pros and Cons of FAN6921?
Pros:
- Integrated Bootstrap Diode: Eliminates the need for an external diode, simplifying the design and saving board space.
- Comprehensive Protection Features: Includes UVLO, over-current protection, and programmable dead time for robust and reliable operation.
- Compact Package: The 8-pin SOIC package is space-efficient and suitable for compact power supply designs.
- Wide Operating Voltage Range: Supports a wide supply voltage range, enhancing its versatility in various applications.
- Cost-Effective: Provides a cost-effective solution for half-bridge driver requirements.
Cons:
- Limited Drive Current: May not be suitable for high-power applications requiring higher gate drive currents.
- External Components: Requires external components such as MOSFETs and passive components for a complete power stage.
- Thermal Considerations: Thermal management may be required for high-power applications to ensure reliable operation.
Are There Any Equivalents/Alternatives to FAN6921 for Recommendation?
- The IR2101 from Infineon Technologies is a similar high- and low-side driver IC suitable for half-bridge applications.
- Alternatives to the FAN6921 include the HIP4081A from Renesas Electronics and the LM5104 from Texas Instruments.
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