FAN7621BSJ

Duty Cycle:	50%
Base Part Number:	FAN7621
Mounting Type:	Surface Mount
Supplier Device Package:	16-SOP
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Operating Temperature:	-40°C ~ 130°C (TJ)
Control Features:	Frequency Control
Fault Protection:	Current Limiting, Over Load, Over Temperature, Over Voltage
Power (Watts):	192W
Frequency - Switching:	Up to 300kHz
Series:	--
Voltage - Supply (Vcc/Vdd):	10 V ~ 25 V
Voltage - Start Up:	12.5V
Topology:	Half-Bridge
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Obsolete
Packaging:	Tube

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Introduction

FAN7621BSJ is an offline AC/DC converter with high-frequency, high-efficiency, contactless zero-voltage switching (ZVS). It is a PFC controller and an offline switcher integrated into an 8-pin SOIC package. It has superior performance over other available isolated power converters, such as high efficiency, low noise, and high reliability. The FAN7621BSJ offers a wide range of applications, suitable for various power conversion needs including standby, standby/battery and general-purpose applications.

Applications

FAN7621BSJ has been widely used in a number of different applications, such as external storage equipment, motor customers, smart phone chargers, and small home appliances. It serves as an efficient solution for DC-DC conversion in a compact size and can help achieve high power conversion efficiency.In addition, the integrated zero-voltage switching circuitry assists designers to achieve Class D performance and improves the overall system\'s efficiency. The integrated PFC control ’s standby power consumption is extremely low. The built-in overvoltage and short circuit protection curves offer high robustness of the system and further extend the power solution’s reliability.

Working Principle

The working principle of the FAN7621BSJ is based on its integrated offline PFC controller and switcher. The switcher part consists of a power MOSFET switch, an auxiliary circuit and a soft-start circuit. The soft-start circuit is a simple high-side current limit device which limits the maximum output current when power is first supplied. This prevents the system from being overloaded during the startup. The power MOSFET switch is used to provide high-frequency, high-efficiency ZVS conversion between AC and DC. The auxiliary circuitry is used to provide a level-shift voltage, which is used to turn on the power MOSFET switch.The PFC controller part is used to provide the necessary regulation loop for the system. The compensation network provides a way to compensate the loop’s speed and accuracy. The output voltage regulation is provided by an inner loop which is formed by a valley-fill control. A current sense circuit is used to detect the load condition and a feedback circuit is used to regulate the output voltage. The PFC controller also provides the necessary protection for the system, such as overvoltage, under-current and over-temperature protections.

Conclusion

Overall, the FAN7621BSJ is an ideal solution for offline AC/DC conversion, due to its high power conversion efficiency, low noise, and high reliability. It is especially suitable for applications that require a compact size, such as motor Customers, laptops, and small home appliances. The integrated ZVS switched circuitry, PFC controller and built-in protections make this a well-rounded solution.

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