UC3842BDR2

DC DC Switching Controllers Overview

The UC3842BDR2G is a high-performance fixed-frequency current mode controller from onsemi, designed for offline and DC-DC converter applications. It operates in SOIC-14 surface-mount packages with separate power and ground pins for the output stage. Key electrical parameters include a maximum switching frequency of 500 kHz, a maximum duty cycle of 96%, and a peak output drive current of 1 A. The device features an internal reference voltage range of 4.9 V to 5.1 V and supports Boost, Flyback, and Forward topologies. Operating temperatures range from -40°C to +105°C.

DC DC Switching Controllers Feature Summary

• High-current totem pole output stage designed for driving N-channel MOSFETs
• Cycle-by-cycle current limiting with latching PWM protection
• Undervoltage lockout with hysteresis for stable startup and shutdown

DC DC Switching Controllers Applications

• Offline flyback converters
• Forward converters
• Boost DC-DC converters

DC DC Switching Controllers Procurement Notes

Verify the exact suffix against official documentation, as 'UC3842BDR2' may lack standard manufacturing suffixes like 'G'. Confirm RoHS compliance status directly with the manufacturer or authorized distributors. Check for active obsolescence notices or product change notifications that may affect long-term availability. Ensure the package type matches the required PCB footprint before ordering.

DC DC Switching Controllers Selection Notes

Select this component for designs requiring precise current-mode control with minimal external components. The SOIC-14 package provides dedicated pins for the output stage, reducing noise susceptibility compared to 8-pin variants. Suitable for applications needing UVLO thresholds around 16V turn-on and 10V turn-off, typical for offline power supplies. Consider thermal management requirements given the operating temperature range up to 105°C.

DC DC Switching Controllers Part Context

Part of the UC384xB family of current mode controllers, which includes UC3842B, UC3843B, UC2842B, and UC2843B. These devices share core architecture but differ in UVLO thresholds and duty cycle ranges. The UC3842B variant specifically targets offline applications with higher UVLO thresholds compared to the UC3843B series.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include UC3842AM and UC3842AN. Verify pin compatibility and electrical specifications before substitution.