The TEA1731TS/1 is a Switched Mode Power Supply (SMPS) Controller IC intended for fly-back topologies. The TEA1731TS operates in peak current and frequency control mode. Frequency jitter has been implemented to reduce electro-magnetic interference. Slope compensation is integrated for continuous conduction mode operation. The IC features overpower protection. The controller accepts an overpower situation for a limited amount of time. One pin is reserved for protection purposes. Over temperature protection (OTP) can be implemented with a minimal number of external components. At low-power levels, the primary peak current is set to 25% of the maximum peak current. The switching frequency is reduced to limit the switching losses. The combination of fixed frequency operation at high output power and frequency reduction at low output power provides high efficiency over the total load range. It makes the design of highly efficient and reliable supplies for power requirements.
Feature
- Integrated overvoltage protection on VCC
- Internal overpower time-out
- Overpower or high/low line compensation
- Fixed switching frequency with frequency jitter to reduce EMI
- Frequency reduction at medium power operation to maintain high efficiency
- Frequency reduction with fixed minimum current to maintain high efficiency at low output levels
- Frequency increase at peak power operation
- Slope compensation for CCM operation
- Adjustable soft-start
- Low and adjustable overcurrent protection trip level
- Protection input (for external OTP and external OVP)
- IC over temperature protection
- Large input voltage range
- 10µA Very low supply current during start-up and restart
- 0.58mA Without load low supply current during normal operation
