Philips Semiconductors' GreenChipII is the second generation of green switched mode power supply (SMPS) control ICs operating directly from the rectified universal mains (70 to 276 V a.c.). A high level of integration leads to a cost effective power supply with a very low number of external components, says the company.
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.
Key 'green' features: Universal mains supply operation (70 to 276 V a.c.); 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.
Key protection features: safe restart mode for system fault conditions; continuous mode protection by means
of demagnetisation 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.
For more information contact Arrow Altech Distribution, 011 923 9600, Avnet Kopp, 011 809 6100 or Mutronics (Value Added Distributor), 011 608 1460.
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