UCC38C40P

DC DC Switching Controllers Overview

The UCC38C40P is a BiCMOS low-power current mode PWM controller manufactured by Texas Instruments. It operates within a supply voltage range of 10 V to 36 V and supports a switching frequency up to 1 MHz. The device features a maximum duty cycle of 100 percent and delivers an output drive current of 1 A at a peak voltage of 18 V. Designed for commercial applications, it functions reliably between 0°C and +70°C. The component is housed in an 8-pin PDIP package.

DC DC Switching Controllers Feature Summary

• Supports 100 percent maximum duty cycle operation
• Integrated high-current 1 A output driver
• Current mode control architecture for stable regulation

DC DC Switching Controllers Applications

• Non-isolated DC-DC converter designs
• Isolated flyback power supply topologies
• Forward converter implementations

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'P' corresponds to the 8-PDIP through-hole package variant when sourcing replacements. Confirm that the intended application requires a maximum duty cycle of 100 percent, as this distinguishes the UCC38C40 from other family members with lower limits. Ensure the operating environment remains within the specified commercial temperature range of 0°C to +70°C to maintain performance specifications.

DC DC Switching Controllers Selection Notes

Select the UCC38C40P when a design demands full duty cycle capability for minimum input voltage conditions or transformer reset requirements. This controller suits applications requiring moderate output drive strength without excessive quiescent current. Consider the PDIP package constraint if automated surface-mount assembly is not available or if manual prototyping is preferred for development stages.

DC DC Switching Controllers Part Context

This component belongs to the UCC38C4x series of BiCMOS current mode PWM controllers. It shares architectural similarities with the UCC38C42 and UCC38C43 but differs primarily in duty cycle limitations. While the UCC38C42 restricts duty cycle to 50 percent, the UCC38C40 allows continuous conduction modes suitable for specific isolated and non-isolated converter topologies requiring full-range pulse width modulation.

DC DC Switching Controllers Replacement Considerations

Direct pin-compatible alternatives include the UCC38C40DR (SOIC package) and UCC38C40DGK (VSSOP package). Verify thermal dissipation requirements when transitioning from the larger PDIP footprint to smaller surface-mount variants.