LM3842AD

DC DC Switching Controllers Overview

The LM3842AD is a fixed-frequency current-mode PWM controller manufactured by TAEJIN Technology. Designed for offline and DC-to-DC converter applications, it integrates a trimmed oscillator, temperature-compensated reference, high-gain error amplifier, and current sensing comparator. The device features a high-current totem-pole output suitable for driving power MOSFETs. It includes built-in under-voltage lockout with hysteresis and current limiting protection. The component operates at switching frequencies up to 500 kHz and supports maximum duty cycles of 100%.

DC DC Switching Controllers Feature Summary

• Optimized for offline and DC-to-DC converter applications with minimal external components
• Features automatic feed-forward compensation and double pulse suppression
• Includes internally trimmed bandgap reference and low startup current
• Provides undervoltage lockout with hysteresis for reliable operation

DC DC Switching Controllers Applications

• Offline power supply designs
• DC-to-DC converter circuits
• Fixed frequency current-mode control schemes

DC DC Switching Controllers Procurement Notes

Verify the manufacturer designation as TAEJIN Technology when sourcing this specific part number. Confirm package type and suffix codes against official datasheets to ensure correct pinout and electrical specifications. Check for moisture sensitivity level requirements during storage and handling procedures.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring precise duty cycle control and high gain error amplification. Consider its suitability for driving power MOSFETs directly via the totem-pole output. Evaluate thermal management needs based on the operating temperature range and internal power dissipation characteristics defined in the technical documentation.

DC DC Switching Controllers Part Context

This component belongs to the LM384xA series of current-mode PWM controllers. It shares functional similarities with industry-standard UCx84x devices but is produced by TAEJIN Technology. The series is characterized by fixed-frequency operation and integrated protection features for robust power management solutions.

DC DC Switching Controllers Replacement Considerations

Compatible alternatives include the UC3842 from NXP Semiconductors and the AMC3842B. Verify pin compatibility and electrical parameter alignment before substitution.

DC DC Switching Controllers FAQ

What is the maximum switching frequency supported by the LM3842AD?

The device supports current-mode operation at frequencies up to 500 kHz.

Does the LM3842AD include protection features?

Yes, it includes built-in under-voltage lockout with hysteresis and current limiting protection.