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50V LDMOS transistors aimed at UHF TV power amps

Posted: 14 Oct 2013     Print Version  Bookmark and Share

Keywords:UHF TV  power amplifier  LDMOS transistor  broadcast transmitter 

Infineon Technologies AG has announced a 50V LDMOS transistors intended for UHF TV broadcast transmitters, including one device providing the highest peak power output available for this application. The high power PTVA047002EV has a rated power output of 135W average, which is eight per cent greater than other available devices, with a DVB-T (8k OFDM) signal and 17.5dB gain, indicated the company.

The higher power output across the entire 470-806MHz TV broadcast band gives amplifier designers the option to use fewer transistors to achieve target output power, which translates to cost savings due to lower component count and higher reliability as a result of simpler design. For a broadcast amplifier design of 12KW, the increased power can eliminate up to 20 RF power transistors representing a significant reduction in total system cost while increasing reliability due to simpler, lower component count design. The lower power PTVA042502EC and PTVA042502FC transistors provide 55W average output power and 18.5dB gain with a DVB-T (8k OFDM) signal, which makes them well-suited for applications such as gap fillers.

Excellent efficiency, typically 26 per cent at 500MHz, reduces heat output. This is complemented by low thermal resistance (Rth 0.20°C/W) of the package, a characteristic of Infineon's 50V LDMOS technology that allows for better thermal management and smaller heat sink designs. This further contributes to lower cost and higher reliability.

Other important features shared by all Infineon 50V LDMOS transistors include high ruggedness (able to withstand 10:1 VSWR load mismatch with 3dB input overdrive), wide gate source voltage range (-6V to 12V) and integrated ESD protection.

Engineering samples of the UHF TV broadcast power transistors are available with production ramp beginning in this calendar quarter for the PTVA042502EC and PTVA042502FC. Production ramp for the PTVA047002EV is planned for 1Q14. Complete reference design/evaluation board kits, including Gerber files and related documentation, also are available.

The PTVA047002EV is available in an open-cavity 275-style package with eared flange. The PTVA042502EC and PTVA042502FC are available in an open-cavity 248-style package with eared and earless flange respectively.

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