UC3865QG3

Voltage - Supply (Vcc/Vdd):	10.5 V ~ 22 V
Base Part Number:	UC3865
Supplier Device Package:	20-PLCC (9x9)
Package / Case:	20-LCC (J-Lead)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Soft Start
Fault Protection:	--
Frequency - Switching:	10kHz ~ 1MHz
Duty Cycle:	--
Series:	--
Voltage - Start Up:	16.5V
Topology:	Full-Bridge, Half-Bridge, Push-Pull
Voltage - Breakdown:	--
Internal Switch(s):	Yes
Output Isolation:	Non-Isolated
Part Status:	Obsolete
Packaging:	Tube

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UC3865QG3 Application Field and Working Principle

Power management integrated circuits (PMIC) are integrated circuits used to create complex and customized power conversion, management and control systems to support a microcontroller or general system power supply requirements. They typically provide a high-efficiency, low-cost solution for system power efficiency and reduce stress on the power source while efficiently converting electrical energy into motion, illumination, or other various forms of power.The UC3865QG3 from Texas Instruments is a power management integrated circuit (PMIC) designed for offline switching applications such as general purpose power supplies, regulation circuits, buck and boost converters, and flyback converters. It is a versatile, low-cost IC that is designed to offer reliable and efficient operation when used in combination with external components such as diodes and power transistors.The UC3865QG3 features adjustable turn-on and turn-off times for the switch, adjustable overcurrent and overvoltage protection, and a soft-start function. It also incorporates a leading edge blanking time circuit to minimize the effects of passive residual conduction in the output switch.The IC is designed to operate in non-synchronous buck, boost and flyback topologies. The control of the IC is provided via a single control terminal (CTRL) which is used to adjust the current across the output switch. The CTRL pin is also used to activate the over-current and over voltage protection circuitry as well as the soft-start functionality.The UC3865QG3 has an on-chip oscillator frequency that can be adjusted to suit the desired application. It is optimized for operation at frequencies up to 500kHz for buck and boost converters, and up to 200kHz for flyback converters.The UC3865QG3 can be used in a variety of applications such as single output switching AC-DC converters, multiple output switching AC-DC converters with overvoltage and overcurrent protection, boost converters with soft start and current limiting, and flyback converters with frequency-dependent turn-on and turn-off control.To summarize, the UC3865QG3 is a PMIC designed for offline switching applications such as general purpose power supplies, regulation circuits, buck and boost converters, and flyback converters. It is optimized for operation at frequencies up to 500kHz for buck and boost converters, and up to 200kHz for flyback converters. It features adjustable turn-on and turn-off times for the switch, adjustable overcurrent and overvoltage protection, and a soft-start function. The UC3865QG3 can be used in a variety of applications such as single output switching AC-DC converters, multiple output switching AC-DC converters with overvoltage and overcurrent protection, boost converters with soft start and current limiting, and flyback converters with frequency-dependent turn-on and turn-off control.

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