TEA1716T/2,518

The TEA1716T integrates a power factor correction (PFC) controller and a half-bridge converter (HBC) in a single multi-chip IC, capable of driving discrete MOSFETs in a boost converter and two discrete power MOSFETs in a resonant half-bridge. High-efficiency PFC operation is achieved through quasi-resonant (QR) operation at high power and a combination of QR operation with valley switching at low power. Built-in OCP, OVP, and demagnetization detection ensure safe controller operation under all conditions. The HBC module is a high-voltage controller for zero-voltage switching LLC resonant converters. It incorporates a high-voltage level-shift circuit and multiple protection circuits, including overcurrent protection, open-loop protection, capacitive mode protection, and a general-purpose latching protection input. The high-voltage chip is fabricated using a proprietary high-voltage Bipolar-CMOS-DMOS power logic process, supporting efficient startup directly from rectified universal mains voltage. A low-voltage SOI chip is used for precise, high-speed protection and control functions. Both the PFC circuit and resonant converter controlled by the TEA1716T are highly flexible, suitable for a wide range of applications across a broad mains voltage range. By integrating PFC and HBC controllers in a single chip, the TEA1716T is an ideal solution for LCD and plasma TV power supply control. Power supplies ranging from 90 W to 500 W with high efficiency and high reliability can be easily designed using the TEA1716T with minimal external components. The integrated burst mode and power management features of the TEA1716T enable resonant applications that meet EuP lot 6 requirements (<0.5 W in standby mode).

Applications

• LCD TVs
• Plasma TVs
• Laptop adapters
• Desktop computers and all-in-one PCs

Key features

• General Features:
• Integrated PFC and HBC controller
• Universal mains operation (AC 70 - 276 V)
• High integration minimizes external component count for cost-effective design
• Integrated burst mode sensing
• EuP lot 6 compliant
• Enable input for independent PFC enable, or simultaneous PFC and HBC controller enable
• On-chip high-voltage startup supply
• Standalone mode or external DC supply for IC power
• PFC Controller Features:
• Critical conduction mode with controlled on-time
• Valley/zero voltage switching for minimized switching losses
• Frequency clamping to reduce switching losses
• Accurate boost regulation
• Burst mode switching with soft-start and soft-stop
• HBC Controller Features:
• Integrated high-voltage level shifter
• Adjustable minimum and maximum frequency
• Half-bridge switching frequency up to 500 kHz
• Adaptive non-overlap time
• Burst mode switching
• Protection Features:
• Safe restart mode on system fault
• Universal latch protection input for output overvoltage or external temperature protection
• Timeout and restart protection timer
• Overtemperature protection
• Soft (re)start for both controllers
• UVLO for mains supply (brownout), boost voltage, IC supply, and output voltage
• Overcurrent regulation and protection for both controllers
• Accurate overvoltage protection for boost voltage
• Capacitive mode protection for HBC controller