ON Semiconductor UC3843BNG Current Mode PWM Controller 13.5V/1A, DIP-8

The ON Semiconductor UC3843BNG is a high-performance, fixed frequency current-mode PWM (Pulse Width Modulation) controller. Engineered for efficiency and reliability, it provides designers with a cost-effective solution for both off-line and DC-to-DC converter applications, requiring minimal external components for a streamlined design process.

At the heart of this integrated circuit is a trimmed oscillator, which ensures precise duty cycle control and stable frequency operation at 52kHz. This is complemented by a temperature-compensated voltage reference and a high-gain error amplifier, delivering consistent performance across a wide range of operating conditions. The high-current totem pole output is optimally designed for driving power MOSFETs effectively.

Key Features & Protections

A significant advantage of this controller is its integrated protective circuitry, which enhances system robustness. This includes input and reference undervoltage lockouts, each featuring hysteresis for noise immunity. It also offers cycle-by-cycle current limiting, programmable output deadtime, and a latch for single-pulse metering, safeguarding your power supply design against fault conditions.

Specifications & Performance

The controller operates from a supply voltage of 12V to 30V and delivers a regulated output of 13.5V at 1A. It supports boost and flyback topologies with a duty cycle range of 0% to 96%. Encased in a through-hole DIP-8 package, it is suitable for industrial power management applications within an operating temperature range of 0°C to 70°C.

Applications

Ideal for demanding power supply designs, the UC3843BNG is perfectly suited for switch-mode power supplies (SMPS), AC/DC converters, battery chargers, and industrial power systems where stable, controlled power delivery is critical. Its combination of performance, integrated protection, and ease of use makes it a preferred