TEA1731LTS/1,115

Overview

The TEA1731LTS/1,115 is a switched mode power supply (SMPS) controller IC designed for flyback topologies. It operates in peak current and frequency control modes with integrated slope compensation for continuous conduction mode operation. The device features a large input voltage range of 12 V to 30 V and supports output power requirements up to 75 W. Key electrical parameters include a typical supply current of 0.58 mA during normal operation without load and 10 µA during start-up. The switching frequency ranges from 27.5 kHz to 82 kHz, with a maximum duty cycle of 80%. It utilizes a TSOP-6 surface mount package.

Feature Summary

• Integrates overpower protection (OPP) with internal time-out and overtemperature protection (OTP) implementation capabilities.
• Employs frequency jitter to reduce electromagnetic interference (EMI) while maintaining fixed frequency at high output power.
• Reduces switching frequency at medium and low power levels to maintain high efficiency across the total load range.
• Features very low supply current during start-up and restart phases to minimize standby power consumption.

Applications

• Low-cost SMPS designs for power requirements up to 75 W
• Flyback topology power supplies requiring high efficiency
• Applications necessitating reduced electromagnetic interference

Procurement Notes

Verify component authenticity through authorized NXP channels or certified distributors. Confirm RoHS compliance status via official documentation. Check for obsolescence notices as availability may be restricted. Ensure storage conditions meet manufacturer specifications to prevent degradation. Validate datasheet revisions against the specific lot code for accurate parameter alignment.

Selection Notes

Select this controller for flyback applications requiring cost-effective design with minimal external components. Consider its wide input voltage range and integrated protections for robust performance. Evaluate thermal management needs due to the TSOP-6 package constraints. Compare efficiency benefits at partial loads against alternative controllers. Verify compatibility with required output power levels up to 75 W.

Part Context

The TEA1731LTS belongs to the TEA173X series of AC-DC controllers by NXP Semiconductors. This family focuses on GreenChip technology for efficient power conversion. The LTS variant specifically targets low-cost implementations while maintaining advanced control features like frequency modulation and overpower protection for reliable operation in various power supply architectures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided data. Consult NXP technical support for direct replacements or pin-compatible alternatives within the TEA173X family if this specific revision is unavailable.

FAQ

How does the TEA1731LTS manage efficiency at low output power?

It reduces the switching frequency and sets the primary peak current to 25% of the maximum to limit switching losses, thereby maintaining high efficiency at low output power levels.

What protection mechanisms are integrated into the TEA1731LTS?

The IC includes integrated overpower protection (OPP) with an internal time-out function and allows for overtemperature protection (OTP) implementation using minimal external components.