NXP – TEA1708: GreenChip Achieves 1mW Power Consumption for X Capacitor Discharging

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TEA1708: GreenChip Achieves 1mW Power Consumption for X Capacitor Discharging

The TEA1708 is an automatic discharge IC for X capacitors with a low power consumption (typically 1mW at 230V (AC)). A 500V clamping circuit is also integrated to protect the IC during mains surges. In a
typical application with only two 200kΩ resistors, the maximum differential mode mains surge voltage allowed exceeds 6kV. The X capacitor discharge current is internally limited to 2.3mA. The discharge delay timer is set externally using a low voltage capacitor. By automatically discharging the X capacitor when the power supply is disconnected from the mains, the TEA1708 reduces power consumption by 20mW to 30mW, compared to using resistive discharge. In addition, a metal oxide varistor is not required to protect the IC.

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

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