IC UC3843A DIP-8 ®

The UC3843 is a high-performance, fixed-frequency, current-mode controller for switching power supplies. The UC3843 features an adjustable oscillator frequency, a voltage-controlled duty cycle, and a programmable current limit. The UC3843 also includes a number of protection features, such as over-voltage and under-voltage protection, over-current protection, and a soft-start circuit.

**Specification:**

* Input voltage range: 3.0 V to 40 V

* Oscillator frequency range: 50 kHz to 1 MHz

* Duty cycle range: 0% to 100%

* Current limit range: 0.5 A to 5 A

* Over-voltage protection range: 2.5 V to 36 V

* Under-voltage protection range: 0.5 V to 2.5 V

* Soft-start time: 1 ms to 25 ms

**Features:**

* Adjustable oscillator frequency

* Voltage-controlled duty cycle

* Programmable current limit

* Over-voltage and under-voltage protection

* Over-current protection

* Soft-start circuit

**Benefits:**

* The UC3843 offers a number of features that make it an ideal choice for a wide range of switching power supply applications.

* The adjustable oscillator frequency allows the user to optimize the switching frequency for the specific application.

* The voltage-controlled duty cycle allows the user to regulate the output voltage of the power supply.

* The programmable current limit allows the user to protect the power supply from over-current conditions.

* The over-voltage and under-voltage protection features help to protect the power supply from damage.

* The soft-start circuit helps to reduce the inrush current and prevent damage to the power supply.

**Application:**

* The UC3843 is used in a wide range of switching power supply applications, including:

* AC-DC power supplies

* DC-DC power supplies

* Inverters

* Motor controllers

* Lighting ballasts