TEA1833TS/1H

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PMIC – AC DC Converters, Offline Switchers

TEA1833TS/1H is an integrated circuit (IC) designed to provide advanced power control functions and off-line converters for switching power systems. Off-line power systems are used in numerous lighting and power applications, such as air conditioners, refrigerators, TVs and computers, in which the auxiliary transformer is used.

In particular, the TEA1833TS/1H provides the following features:

• Continuous conduction frequency modulated (FCM)-mode flyback topologies;
• Primary-side feedback with external optocoupler;
• On-time capability set by an external resistor;
• Overload protection with automatic re-cutting;
• Programmable output capacitor discharging time;
• Leading-edge modulation (LEM) buck/Boost regulator
• Output voltage soft-start;
• Undervoltage protection from input or output terminals.

The TEA1833TS/1H adopts the on primary side control topology for the FRM flyback converter. This a proposed approach to reduce the design complexity of the offline switch power systems and also improves system efficiency. It uses the BEMF zero-cross technique to detect the current ZCS point, and sets the two switching parameters, duration (T1) and dead time (DT).

The proposed topology has the advantages of a large power-transfer efficiency, compared with those obtained with conventional solutions. In addition, the primary-side control solutions reduces the number of components and improve the overall design reliability.

The working principle of the TEA1833TS/1H is based on the use of a power transistor acting as a switch. The current of the draining node is sensed and regulated to maintain the output voltage across the load steady. To control, it is regulated the turn-on and turn-off of the switching device. The on-time duration is regulated by an external resistor. The output capacitor is discharged after the switch is off, by another external resistor.

The Overload Protection (OLP) helps to prevent the power converter from being damaged due to overcurrent. This feature is switched on and disabled by an internal circuit. The switching control logic monitors the sensing pin voltage. If the OLP mechanism is triggered, the power controller is disabled by the over-temperature protection circuit, and the opto-coupler pin is reset to a zero-volt level.

The TEA1833TS/1H also supports the Leading Edge Modulation (LEM) buck/Boost regulator. This solution has a two-stage regulation process that is used to maintain the load current output stability. The first stage is a buck mode and the second is a Boost mode. The LEM regulator compensates the output current if there is a large variation in the input voltage change or a large load change.

The output voltage soft start feature is essential for reducing the peak current at startup. It starts from a low voltage and ramps up to the desired output voltage level. In addition, the Undervoltage Protection (UVP) prevents the converter from entering the start-up state, when the input or output voltage falls below the specified voltage.

The TEA1833TS/1H is a highly integrated device that can enable a wide variety of off-line power systems. It provides advanced power control functions and advanced protection features, making it suitable for a variety of lighting and power applications.

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