TEA1654

Distinctive features
· Universal mains supply operation (70 to 276 V AC)
· High level of integration, giving a very low external component count.
Green features
· Valley or zero voltage switching for minimum switching losses
· Efficient quasi-resonant operation at high power levels
· Frequency reduction at low power standby for improved system efficiency (<3 W)
· Cycle skipping mode at very low loads; Pi < 300 mW at no-load operation for a typical adapter application
· On-chip start-up current source
· Standby indication pin to indicate low output power consumption.
Protection features
· Safe restart mode for system fault conditions
· Continuous mode protection by means of demagnetization detection (zero switch-on current)
· Accurate and adjustable overvoltage protection (latched)
· Short winding protection
· Undervoltage protection (foldback during overload)
· Overtemperature protection (latched)
· Low and adjustable overcurrent protection trip level
· Soft (re)start
· Mains voltage-dependent operation-enabling level
· General purpose input for lock protection.

Notes
1. All voltages are measured with respect to ground; positive currents flow into the chip; pin VCC must not be current
driven. The voltage ratings are valid provided other ratings are not violated; current ratings are valid provided the
maximum power rating is not violated.
2. Human Body Model (HBM): equivalent to discharging a 100 pF capacitor through a 1.5 kW series resistor.
3. Machine Model (MM): equivalent to discharging a 200 pF capacitor through a 0.75 mH coil and a 10 W resistor.

The TEA1654 GreenChipä(1)II is the second generation of green Switched Mode Power Supply (SMPS) control ICs operating directly from the rectified universal mains. A high level of integration leads to a cost effective power supply with a very low number of external components.

The TEA1654 special built-in green functions allow the efficiency to be optimum at all power levels. This holds for quasi-resonant operation at high power levels, as well as fixed frequency operation with valley switching at medium power levels. At low power (standby) levels, the system operates at reduced frequency and with valley detection.

The TEA1654 proprietary high voltage BCD800 process makes direct start-up possible from the rectified mains voltage in an effective and green way. A second low voltage BICMOS IC is used for accurate, high speed protection functions and control.

Highly efficient, reliable supplies can easily be designed using the GreenChipII control IC.