General description

The TEA19161CT is a fully digital controller for high-efficiency resonant power supplies.

Together with the TEA19162CT PFC controller and the TEA1995T dual SR controller,

a complete resonant power supply can be built which is easy to design and has a very

low component count. This power supply meets the efficiency regulations of Energy Star,

the Department of Energy (DoE), the Eco-design directive of the European Union, the

European Code of Conduct, and other guidelines. So, any auxiliary low-power supply can

be omitted.

In contrast to traditional resonant topologies, the TEA19161CT (LLC) shows a high

efficiency at low loads due to the newly introduced low-power mode. This mode operates

in the power region between continuous switching (also called high-power mode) and

burst mode.

Because the TEA19161CT is regulated via the primary capacitor voltage, it has accurate

information about the power delivered to the output. The measured output power

defines the mode of operation (burst mode, low-power mode, or high-power mode). A

configuration pin can easily set the transition levels of the operating modes.

The TEA19161CT contains a low-voltage die with a fully digital controller for output

power control, start-up, initializations, and protections. These protections include

overcurrent protection (OCP), overvoltage protection (OVP), open-loop protection (OLP),

and capacitive mode regulation (CMR). It also contains a high-voltage silicon-on-insulator

(SOI) controller for high-voltage start-up, integrated drivers, level shifter, protections, and

circuitry assuring zero-voltage switching.

The TEA19161CT is designed to cooperate with the TEA19162CT power factor

control (PFC) controller. For communications about start-up and protections, the

TEA19161CT contains a digital control interface. The digital control enables a fast latch

reset mechanism. It maximizes the overall system efficiency at low output power levels

by setting the TEA19162CT to operate in burst mode.

The TEA19161CT/TEA19162CT/TEA1995T combination gives an easy to design,

highly efficient, and reliable power supply, providing 90 W to 500 W, with a minimum of

external components. The system provides a very low no-load input power (< 75 mW;

total system including the TEA19161CT/TEA19162CT/TEA1995T combination) and high

efficiency from minimum to maximum load. So, any additional low-power supply can be

omitted, ensuring a significant system cost saving and highly simplified power supply

design.

Features and benefits

Distinctive features

• Complete functionality as a combination with TEA19162CT

• Integrated high-voltage start-up

• Integrated high-voltage level shifter (LS)

• Extremely fast start-up (< 500 ms at Vmains = 100 V (AC))

• Continuously VSUPIC regulation via the SUPHV pin during start-up and protection,

allowing minimum SUPIC capacitor values

• Operating frequencies are outside the audible area at all operating modes

• Integrated soft start

• Power good function

• Maximum 500 kHz half-bridge switching frequency

Green features

• Extremely high efficiency from low load to high load

• Compliant with Energy using Product directive (EuP) lot 6

• Excellent no-load input power (< 75 mW for TEA19161CT/TEA19162CT/TEA1995T

combination)

• Regulated low optocurrent, enabling low no-load power consumption

• Very low supply current during non-switching state in burst mode

• Transition between different operation modes (high-power/low-power/burst mode)

occurs at integrated, externally adjustable power levels

• Adaptive non-overlap time

Protection features

• Supply undervoltage protection (UVP)

• Overpower protection (OPP)

• Integrated adjustable overpower timeout

• Adjustable latch or restart function for overpower protection (OPP)

• On-chip overtemperature protection (OTP)

• Capacitive mode regulation (CMR)

• Accurate overvoltage protection (OVP)

• Maximum on-time protection for low-side and high-side driver output

• Overcurrent protection (OCP)

• Disable input