NXP launches GreenChip drives power consumption of X-Capacitor discharge down to one milliwatt

NXP TEA1708

 NXP Semiconductors  introduced the GreenChip TEA1708 an automatic discharge IC for X capacitors with an extremely low power consumption of 1 mW at 230 V (AC). Power supplies have traditionally relied on resistive discharge for X capacitors, which are used to reduce EMI (electromagnetic interference). By automatically discharging the X capacitor when the power supply is disconnected from the mains, the TEA1708 reduces power consumption by 20 – 30 mW, compared to using resistive discharge.

In addition to the automatic discharge functionality, the TEA1708 integrates a 500 V clamping circuit, protecting the IC during mains surges and making the device very rugged. To protect the TEA1708, no additional metal-oxide varistor (MOV) is required. In a typical application with only two 200 kΩ resistors, the maximum differential mode mains surge voltage allowed exceeds 6 kV. The breakthrough reduction in power consumption achieved by the TEA1708 – combined with its extreme ruggedness in withstanding power surges – make it a compelling solution for power supply manufacturers aiming to comply with new regulatory requirements such as Version 5 of the Code of Conduct (CoC) for External Power Supplies (EPS) and the amended ErP Lot 6, both introduced by the European Commission earlier this year.

NXP TEA1708

Key Features of the TEA1708

  • Nemko certified for compliance with IEC 60950-1
  • Ultra-low 1 mW power consumption at 230 V (AC)
  • Integrated 500 V clamp; no metal oxide varistor required to protect the IC
  • Self supplied, no external bias requiredDischarge current internally limited to 2.3 mA, supporting use of large-value X capacitors
  • Adjustable discharge delay timer using an external low-voltage capacitor
  • Very high differential surge: 6 kV with two 200 kΩ resistors
  • Easier application design, resolving EMI issues while retaining the efficiency level

nxp.com

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