UC3844NG

DC DC Switching Controllers Overview

The UC3844NG is a high-performance fixed-frequency current mode controller from onsemi, designed for offline and DC-to-DC converter applications. It operates within a supply voltage range of 10V to 36V, with UVLO thresholds at 16V (on) and 10V (off). The device supports switching frequencies up to 500 kHz and delivers a maximum duty cycle of 48%. It features an internally trimmed reference, a high-gain error amplifier, and a high-current totem pole output stage capable of driving N-channel MOSFETs. The component is housed in an 8-pin PDIP package and functions within a temperature range of -25°C to 85°C.

DC DC Switching Controllers Feature Summary

• Current mode control architecture enabling precise regulation with minimal external components
• Integrated under-voltage lockout with hysteresis for stable startup and operation
• Cycle-by-cycle current limiting with latching PWM protection against overcurrent faults
• Internal toggle flip-flop ensuring output blanking every other clock cycle for safe dead-time management

DC DC Switching Controllers Applications

• Offline flyback power supplies
• Forward converter topologies
• Boost and buck-boost DC-to-DC converters
• Battery charger circuits

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'NG' corresponds to the 8-pin PDIP package variant when sourcing. Confirm RoHS compliance status as manufacturing processes may vary by region. Ensure the supplier provides official datasheets matching the UC3844B family specifications. Cross-reference pinouts to distinguish between SOIC and DIP configurations if alternative packages are considered.

DC DC Switching Controllers Selection Notes

Select this component for designs requiring a maximum duty cycle below 50% due to the internal toggle flip-flop. It is suitable for off-line applications where the higher UVLO threshold aligns with rectified line voltages. Consider thermal dissipation limits in the PDIP package for high-power implementations. Verify that the required switching frequency does not exceed the guaranteed oscillator stability limits.