STMicroelectronics UC3842BN Current Mode PWM Controller IC DIP8

The STMicroelectronics UC3842BN Current Mode PWM Controller IC is a fixed-frequency current mode pulse width modulation controller in a DIP8 package, designed for efficient power management with a minimal external component count. It is suitable for both off-line and DC-to-DC converter applications.

Overview

The IC integrates a trimmed oscillator for precise duty cycle control and frequency stability, along with an under-voltage lockout circuit that has a start-up current of less than 0.5 mA. A precision voltage reference, trimmed for accuracy at the error amplifier input, supports overall system stability. The PWM comparator also provides current limit control, and a high-current totem pole output stage is capable of sourcing or sinking significant peak current.

Key Features

• Trimmed oscillator with a frequency of 250 kHz for accurate timing and control
• Current mode operation supported up to 500 kHz
• Automatic feed-forward compensation to improve line regulation
• Latching PWM with cycle-by-cycle current limiting for overload protection
• Internally trimmed reference with under-voltage lockout and hysteresis
• High-current totem pole output for directly driving power MOSFETs
• Low start-up and operating current for improved efficiency

Specifications

• Controller Type: Single Ended
• Channels: 1
• Control Mode: Current Mode
• Supply Voltage: 12V to 25V (Nominal 15V)
• Package: DIP8
• Width: 3.3, Depth: 1.5, Height: 4.3
• Weight: 0.001 g

Choose the STMicroelectronics UC3842BN when a compact current mode PWM controller for off-line or DC-to-DC converter designs is required.