General description

The TEA9026T is a digital LLC resonant mode controller for resonant power supplies

with a wide input voltage range. The power supply is easy to design and has a very low

component count. It 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, no auxiliary low-power supply is required. To increase

the efficiency of a low-voltage supply output, the TEA2095T dual SR controller can be

added on the secondary side.

In contrast to traditional resonant topologies, the TEA9026T (LLC) achieves 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 TEA9026T 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). With a single

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

The TEA9026T 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). The TEA9026T also contains a high-voltage siliconon-

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

protections, and circuitry assuring zero-voltage switching.

The TEA9026T LLC controller enables the building of an easy to design, highly efficient,

and reliable power supply. The power supply can provide 90 W to 500 W output power

with a minimum of external components. It has a very low no-load input power (< 90 mW)

and a high efficiency from minimum to maximum load. So, no additional low-power

supply is required, which ensures a significant system cost saving and a highly simplified

power supply design, while meeting the latest power supply guidelines and regulations.

Features and benefits

2.1 Key features

• Wide input voltage range

• Externally adjustable OPP level

• Integrated high-voltage start-up

• Integrated high-voltage Level Shifter (LS)

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

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

allowing minimum SUPIC capacitor values

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

• Integrated soft start

2.2 Green features

• Extremely high efficiency from low load to medium load

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

• Excellent no-load input power (< 90 mW for TEA9026T/TEA2095T combination)

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

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

• Accurate transition between different operation modes

• Externally adjustable low-power mode to burst mode transition level

• Adaptive non-overlap time

2.3 Protection features

• Supply undervoltage protection (UVP)

• 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

Applications

• Large screen (UHD/4K) TVs

• Printers

• E-bike chargers