Onsemi UC3843BNG Current Mode PWM Controller 13.5V/1A DIP-8

Onsemi UC3843BNG Current Mode PWM Controller 13.5V/1A DIP-8 is a fixed frequency, current-mode PWM (Pulse Width Modulation) controller that delivers a regulated 13.5V output at 1A for off-line and DC-to-DC converter designs.

Overview

The UC3843BNG is built around a trimmed oscillator that supports precise duty cycle control and stable operation at 52kHz. A temperature-compensated voltage reference and a high-gain error amplifier provide consistent performance across a range of operating conditions. The high-current totem pole output is designed to drive power MOSFETs. The controller requires minimal external components, which supports a streamlined design process.

Key Features and Protections

• Input and reference undervoltage lockouts, each with hysteresis for noise immunity
• Cycle-by-cycle current limiting
• Programmable output deadtime
• Latch for single-pulse metering

These integrated protective functions are intended to enhance system robustness and help safeguard the power supply design against fault conditions.

Specifications

The controller operates from a supply voltage of 12V to 30V and supports boost and flyback topologies with a duty cycle range of 0% to 96%. It is supplied in a through-hole DIP-8 package and is rated for an operating temperature range of 0°C to 70°C. Dimensions are 3.3 (width) x 1.5 (depth) x 4.3 (height), and the product weighs 2.419 g.

Applications

The UC3843BNG is suited to switch-mode power supplies (SMPS), AC/DC converters, battery chargers, and industrial power management systems where stable, controlled power delivery is required.