TEA1552
HV start-up flyback controller for DCM or QR mode; 125 kHz
fosc(h); standby output signal
Rev. 3.1 — 21 June 2012
Product data sheet
1. General description
The GreenChipII 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 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 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.
2. Features and benefits
Distinctive features:
Universal mains supply operation (70 V AC 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)
