UCC38C44DGKRG4

Duty Cycle:	48%
Base Part Number:	UCC38C44
Mounting Type:	Surface Mount
Supplier Device Package:	8-VSSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control
Fault Protection:	Current Limiting
Frequency - Switching:	Up to 1MHz
Series:	--
Voltage - Supply (Vcc/Vdd):	9 V ~ 18 V
Voltage - Start Up:	14.5V
Topology:	Forward
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UCC38C44DGKRG4 Application Field and Working PrincipleThe UCC38C44DGKRG4 is a device generally used in PMIC - AC DC converters, offline switchers. This device is a power management IC that is designed to provide power supply solutions for most offline systems. The device has been designed for applications requiring high efficiency, low power dissipation and compact design.The typical application field of the UCC38C44DGKRG4 includes switch-mode power supplies and LED lighting systems. The device is capable of providing high efficiency, wide input voltage range and high output current. The device can also be used as a universal offline switcher, capable of controlling the input voltage, output voltage, and current in an efficient manner.The main working principles of the UCC38C44DGKRG4 involve two stages. The first stage is an offline, high-voltage, soft start circuit that consists of a MOSFET, voltage reference, and a comparator. The MOSFET is used to control the primary of the system\'s transformer, while the voltage reference and comparator are used to detect a stable start-up voltage. When a voltage is detected above a certain level, the MOSFET is switched on and a drive circuit is engaged to control the MOSFET and set the delay time. The drive circuit is responsible for controlling the on and off times of the MOSFET to ensure a stable output voltage. The delay time is set based on the voltage requirement of the system. Once the required output voltage has been reached and a stable start-up voltage has been established, the device reduces the current load on the MOSFET and the drive circuit is disengaged.The second stage is an offline, low-voltage, feedback loop circuit consisting of an output Schottky diode, current sense resistor, current controller, and voltage supervisor IC. The Schottky diode is used to sense the output load current and to reduce the power dissipation in the switch-mode power supply. The current sense resistor is used to monitor the output load current. The current controller is used to adjust the output voltage by adjusting the duty cycle or current. Finally, the voltage supervisor IC is used to protect the system from over-voltaging or over-currenting.In summary, the UCC38C44DGKRG4 is a PMIC - AC DC Converters, Offline Switchers device that is used to provide power supply solutions for offline systems. The device has been designed for applications requiring high efficiency, low power dissipation and compact design. The device has two stages of operation, namely a high-voltage, soft start circuit and a low-voltage, feedback loop circuit, which are both responsible for controlling the output voltage, current, and providing protection to the system.

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