TNY267GN-TL

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The TNY267GN-TL belongs to the family of PMIC - AC DC Converters, Offline Switchers. It is a primary side controller translates a low cost, low power isolated DC-DC converter. The device is designed for applications that require galvanic isolation such as portable electronics and telecomms. It also supports isolated fly-back topologies. The TNY267GN-TL operates from an input voltage range of 9V to 18V in both forward and fly-back topologies, with a maximum output power of around 10W. The main features of the TNY267GN-TL are its high integration and very low external component count, which reduces cost and design time. The device offers true galvanic isolation between the input and the output, with a nominal isolation voltage of 850V RMS. In addition, it incorporates a high accuracy primary side feedback loop, as well as a hysteretic thermal protection.The internal block diagram of the TNY267GN-TL consists of: Start up circuit, current mode controller, Current Sense and Frequency modifier, Soft start circuit, Error amplifier, and MOSFET driver.The start up circuit is responsible for generating an internal reference voltage in order to provide the voltage for the error amplifier, current sense and soft-start circuit. The current mode controller is designed to provide the regulated output voltage. The current sense and frequency modifier circuit achieves high efficiency operation, by sensing the two external MOSFETs voltage and current waveforms and adjusting the switching frequency.The Soft start circuit is used to limit the inrush current and provide a soft start. The error amplifier is used to compare the output voltage with a reference voltage and produce an error voltage that is proportional to the output voltage difference. It also drives an internal compensation circuit so that output can be regulated. The MOSFET driver outputs high and low switching signals to the external MOSFETs.

The device has a wide range of protection features, such as: over voltage protection (OVP), open loop protection (OLP), output over voltage protection (OVP) and over current protection (OCP). The over voltage protection or OVP is used to protect the power supply from voltage spikes and close-loop protection is used to protect the converter from very low voltages by turning off the external MOSFETs when the output voltage gets too low. The output over voltage protection, or OVP, is used to protect the device from over-charging when the output voltage gets too high. Finally, the over current protection or OCP is used to protect the converter from short circuits or over-loading by turning off the MOSFETs.

The working principle of the device is based on the fact that it uses primary side feedback to regulate the output voltage. The device senses the output voltage at the source of the secondary winding via the transformer primary and then compares it with a reference voltage. Depending on the difference between the two signals, it adjusts the switching frequency and duty cycle by driving the gate of the two MOSFETs until the output voltage is within the specified limits.

In summary, the TNY267GN-TL device from SGS Thomson is a very low cost and low power, isolated DC-DC converter that has been designed for isolated fly-back topologies and applications that require galvanic isolation. It features a wide range of protection features, is ultra-compact and supports low external component count, which reduces cost and design time. It employs a primary side feedback loop in order to regulate the output voltage and is capable of providing up to 10W of output power.

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