UCC3818DWTRG4

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Mode:	Average Current
Frequency - Switching:	6kHz ~ 220kHz
Current - Startup:	150µA
Voltage - Supply:	12 V ~ 17 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	UCC3818

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UCC3818DWTRG4 is a member of TI\'s family of UCC38xx series integrated circuits. It is a single-channel, high-performance Pulse Width Modulation (PWM) voltage mode controller, designed to deliver high performance while providing an economical and cost effective solution for power factor correction (PFC). As a PFC controller, the UCC3818DWTRG4 can be used to regulate the input power factor, to reduce total harmonic distortion (THD) over a wide range of line and load conditions, and to reduce the input current waveform distortion.

Overview of UCC3818DWTRG4

The UCC3818DWTRG4 is a single-channel voltage-mode PFC controller integrated with a fault timer, a synchronous MOSFET driver, a low-gate-charge power MOSFET, a varactor circuit, and a low frequency oscillator. The UCC3818DWTRG4 provides a high performance, cost effective solution for PFC applications. It is designed for operation in the discontinuous conduction mode (DCM) with a superior line transient response. Other features include:• Quantification of the power factor at unity gain, allowing the fast response time required for mandatory international standard. • Temperature Protection for both heavy loads and for overtemperature conditions, which is useful in applications such as air-conditioners where the load is highly varying. • Overvoltage protection, overcurrent protection and load transient protection to provide safe operation. • Undervoltage Lockout (UVLO) and Frequency Clamp Functions to ensure that the controller is not operating at a too-high line frequency, or when the line voltage is too low.

UCC3818DWTRG4 Application Field

UCC3818DWTRG4 is designed to provide a power factor correction solution for applications whether AC-input or DC-input, such as refrigerators, air-conditioners, DC/DC converters, induction cookers, lighting systems and electronic ballasts, etc. Its high performance, low cost and variety of features makes it ideal for use in a wide variety of applications.

Working Principle of UCC3818DWTRG4

The UCC3818DWTRG4 is a pulse width modulation (PWM) controller which uses the principle of voltage mode regulation. The aim of the controller is to deliver a stable DC voltage across the output terminals regardless of the input voltages or the load variations. The device works by comparing the output voltage to a programmable reference voltage (Vref). If the output voltage is below the reference voltage, the device turns on the MOSFET switch and the output voltage increases; conversely, if the output voltage is above the reference voltage, the device turns off the MOSFET switch and the output voltage decreases. In this manner, the output voltage is regulated to the programmed value.The UCC3818DWTRG4 also incorporates a fault timer. This timer will detect any output voltage overshoot and restrict the controller from turning on the MOSFET switch beyond a predetermined time limit. This timer provides the device with some additional safety features against high currents due to transient overloads. It also provides protection against short circuits.

Conclusion

UCC3818DWTRG4 is a versatile and cost effective single-channel voltage-mode PFC controller, designed to deliver high performance while providing an economical and cost effective solution for power factor correction applications, such as refrigerators, air-conditioners, DC/DC converters, induction cookers, lighting systems and electronic ballasts. It incorporates a fault timer, a synchronous MOSFET driver, a low-gate-charge power MOSFET, a varactor circuit, and a low frequency oscillator. The device works by comparing the output voltage to a programmable reference voltage (Vref). If the output voltage is below the reference voltage, the device turns on the MOSFET switch and the output voltage increases; conversely, if the output voltage is above the reference voltage, the device turns off the MOSFET switch and the output voltage decreases. In this way, it is able to provide stable DC output under varying line and load conditions.

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