Philips Semiconductors
SMPS control IC with
synchronization function
Product specification
TEA1541
1 FEATURES
1.1 Distinctive features
• Universal mains supply operation (70 to 276 V AC)
• High-level of integration requiring few external
components
• Synchronization with internal frequency divider
• Frequency independent over-power protection.
1.2 Green features
• Frequency reduction at low power standby for improved
system efficiency (<3 W)
• Burst mode operation for very low power standby
levels (<1 W)
• On-chip start-up current source.
1.3 Protection features
• Safe restart mode for system fault conditions
• Continuous mode protection using demagnetization
detection (zero switch-on current)
• Accurate and adjustable overvoltage protection
• Winding short-circuit protection
• Undervoltage protection (foldback during overload)
• Overtemperature protection
• Adjustable low overcurrent protection (OCP) trip level
• Soft (re)start
• Mains voltage-dependent operation-enabling level.
2 GENERAL DESCRIPTION
The TEA1541 is a second generation GreenChipTM(1)
Switched Mode Power Supply (SMPS) controller IC that
operates directly from the rectified universal mains.
A high-level of integration provides a cost-effective power
supply requiring only a few external components.
The TEA1541 controller enables easy design of highly
efficient, reliable switched mode power supplies.
Its internal oscillator can be synchronized to pulses from
an external signal source. External synchronizing pulses
whose frequency is above the SMPS switching frequency
range are divided by an internal divider.
Special built-in green functions ensure optimum efficiency
at all power levels. At low power (standby) levels, the
SMPS supply operates at a lower frequency. In burst
standby mode, power consumption can be reduced to less
than 1 W.
The proprietary EZ-HV SOI process allows start-up
directly from the rectified mains voltage, avoiding the need
for bleeder circuits, and also saves energy.
A low voltage BICMOS implements accurate control and
high speed protection functions.
(1) GreenChip is a trademark of Koninklijke Philips
Electronics N.V.
3 ORDERING INFORMATION
TYPE
NUMBER
TEA1541P
NAME
DIP8
PACKAGE
DESCRIPTION
plastic dual-in-line package; 8 leads (300 mil)
VERSION
SOT97-1
2003 Aug 11
3