General description
The TEA1731LTS is a low cost Switched Mode Power Supply (SMPS) controller IC intended for flyback topologies. The TEA1731LTS operates in peak current and frequency control mode. Frequency jitter has been implemented to reduce ElectroMagnetic Interference(EMl). Slope compensation is integrated for Continuous Conduction Mode
(CCM) operation.
The TEA1731LTS IC features OverPower Protection(OPP). 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.
The TEA1731LTS makes the design of low cost, highly eficient and reliable supplies for power requirements up to 75 W easier by requiring a minimum number of external components.
Features and benefits
■SMPS controller IC enabling low-cost applications
■Large input voltage range(12 V to 30V)Integrated OverVoltage Protection (OVP) on VCC
■Very low supply current during start-up and restart (10 uA typical)
■Low supply current during normal operation (0.58 mA typical without load)
■Internal overpower time-out
■Overpower or high/low line compensation (NXP patent:81421271EP01)
■Fixed switching frequency with frequency jitter to reduce EMl Frequency reduction at medium power operation to maintain high efficiency
■Frequency reduction with fixed minimum peak current to maintain high efficiency at low output power levels
■Frequency increase at peak power operation
■Slope compensation for CCM operation
■Adjustable soft start
■Low and adjustable OverCurrent Protection (OCP) trip level
Applications
■All applications that require an efficient and cost-effective power supply solution up to 75W.
Feature
- Large input voltage range (12 to 30 V)
- High integration and small TSOP6 package
- Enables no-load power consumption levels below 100 mW
- 6-pin controller with high/low input voltage compensation and maximum duty cycle protection
- Very low supply currents during start-up and normal operation
- Adapters for notebooks, netbooks, tablets, printers
- Power supplies for LCD monitors, set-top boxes (STB), Blu-ray and DVD players
