UC3843 Current Mode PWM Controller IC

The UC3843 Current Mode PWM Controller IC is a widely used pulse-width modulation controller for switching regulators and power supplies. It offers high efficiency, stable current mode control, and wide frequency operation up to 500 kHz, making it ideal for demanding industrial and consumer electronics applications.

With its low start-up current, fast switching response, and built-in oscillator, the UC3843 provides superior control in SMPS, inverters, battery chargers, and DC-DC converters. Its DIP-8 package ensures easy integration into standard circuit designs.

🔹 Applications

• Switch Mode Power Supplies (SMPS)

• DC-DC converters (step-up/step-down regulators)

• Battery chargers and adapters

• LED lighting power drivers

• Inverter circuits and UPS systems

• Motor control and industrial drives

• General-purpose power electronics

🔹 Precautions

• Do not exceed maximum supply voltage (Vcc = 30V)

• Ensure proper heat dissipation in high-power designs

• Use snubber circuits to protect from voltage spikes

• Add decoupling capacitors near Vcc for noise suppression

• Follow PCB layout guidelines to minimize EMI and instability

• Operate within the temperature range (–40°C to +85°C)

🔹 Technical Specifications

• IC Type: Current Mode PWM Controller

• Package: DIP-8

• Supply Voltage (Vcc): 7V – 30V

• Operating Frequency: up to 500 kHz

• Start-Up Current: 0.5 mA (typical)

• Operating Current: 17 mA (typical)

• Reference Voltage: 5V ± 1%

• Duty Cycle: 0% – 100%

• Oscillator Frequency: Adjustable with external components

• Operating Temperature: –40°C to +85°C

• Applications: SMPS, DC-DC converters, chargers, inverters

📹 Tutorial Video

Watch UC3843 PWM Controller Tutorial

🔹 Related Categories

• IC’s

• Electronics Components

• Power Supplies

• Tools and Accessories

🔹 Summary

The UC3843 Current Mode PWM Controller IC is a reliable and efficient solution for SMPS, DC-DC converters, and power electronics applications. With high-speed performance, low power consumption, and stable current mode control, it is an essential component in modern power supply designs. A must-have for IC’s and Electronics Components collections.