UC385TDKTTT-1G3

UC385TDKTTT-1G3 application field and working principle

UC385TDKTTT-1G3 is a three-terminal adjustable linear voltage regulator. It belongs to the linear voltage regulator family and is mainly used for voltage regulators, power management circuit, and automotive electronics applications.

Working Principle

UC385TDKTTT-1G3 use PNP bipolar transistors to take advantage of the good linear voltage regulation properties of such devices, providing a precision voltage regulation system for current levels up to 2 A with a relatively minimal number of external components.

The output voltage VOUT of a UC385TDKTTT-1G3 device is determined by the ratio of two resistors—the adjustment resistor R2 and the series resistor R1. Resistors R1 and R2 establish a voltage divider loop, whose output voltage is applied to the non-inverting input of the internally constructed error amplifier. This voltage divider is usually connected between the output terminal and the reference terminal, although it could be connected between the reference terminal and ground.

The UC385TDKTTT-1G3 device has an internal voltage reference source. Internally, it compares the reference voltage to the divider voltage in order to maintain a constant output voltage. When the output voltage is lower than required, the voltage error signal causes the output of the error amplifier to swing high. This increase in voltage signal turns the PNP pass element "on", allowing the output current to flow in the pass element to the output.

The UC385TDKTTT-1G3 device provides current limiting, thermal overload protection, and short circuit protection. It has a peak output current of 2 A, with a maximum power dissipation of up to 2.5 W. The device can operate from an input voltage range from 4.0 V to 40 V, and operates over the full adjustable output voltage range from 1.0 V to 28V with up to 2A load current.

Application Field

UC385TDKTTT-1G3 can be used in variouslinvoltage regulator applications, ranging from consumer electronics, automotive electronics, to medical and telecommunication systems. It can be used as voltage regulators, power management circuits, and current limiting circuits.

UC385TDKTTT-1G3 is commonly used in charging systems, DC-DC converters, relays and motors, or any other power management system, such as battery-powered systems, where a steady voltage must be maintained. It is also suitable for use in automotive and general-purpose linear applications where a low standby current is a requirement.

UC385TDKTTT-1G3 devices are also useful in LED lighting systems and motor drive applications, where they provide a reliable source of power. UC385TDKTTT-1G3 devices provide excellent line and load regulation and very low output noise. In addition, they are capable of operating at temperatures up to 125°C without significant derating of power.