UCC3802NG4

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The UCC3802NG4 is an offline switcher developed by Texas Instruments (TI) and is used for power management in several applications. This device integrates a driver, power switch and control circuitry in an 8-Pin DIP package. It is capable of driving an external N-channel MOSFET, high side and low side switch, and has overvoltage, overcurrent and over temperature safety protections.

UCC3802NG4 can be applied in several applications including AC-DC converters, battery chargers, USB port power supply, and home/industrial-application power supplies. The device can provide two distinct outputs, allowing it to meet a wide variety of user needs. It also provides overcurrent protection, undervoltage lockdown, and zero-voltage crossing turn-on/off features. In terms of efficiency, this device operates with a minimum of 2V input voltage, with efficiency reaching up to 97 percent at 5V inputs.

Regarding its principle of operation, the UCC3802NG4 incorporates a Triac Driver and a power switch. In the standby mode, both MOSFETs are off and the device draws very low “quiescent” current. When the supply voltage reaches a certain level, the system is enabled and the MOSFETs become conductive. The device includes a latch in the power switch, which allows the switch to be driven through its Triac Driver. The Triac Driver is composed of two transistors and a diode, and is used to supply the necessary current to the power switch. In addition, the Zero-Voltage Crossing PWM Control circuit is set up to manage the switching operation.

In conclusion, the UCC3802NG4 is a very useful device for offline switcher applications as it can provide two distinct outputs, offer overvoltage, overcurrent and over temperature safety protections, operate with a minimum of 2V input voltage and achieve up to 97 percent efficiency at 5V inputs. It is mainly used in AC-DC converters, battery chargers, USB port power supply, home/industrial-application power supplies, and more.

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