General description

The TEA1708 is an automatic discharge IC for X capacitors with a low power

consumption (typically 1 mW at 230 V (AC).

A 500 V clamping circuit is integrated, protecting the IC during mains surges. In a typical

application with only two 200 kΩ resistors, the maximum differential mode mains surge

voltage allowed exceeds 6 kV. A metal-oxide varistor is not required to protect the IC.

The X-capacitor discharge current is internally limited to 2.3 mA. The discharge delay

timer is set externally using a low-voltage capacitor.

To reduce EMI while retaining the low standby power, the very low power consumption

with a high discharge current enables the use of a high value X-capacitor.

Features and benefits

• 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 required

• Discharge current internally limited

• Adjustable discharge delay

• Very high differential surge: 6 kV with two 200 kΩ resistors

• Easier application design, resolving EMI issues while retaining the efficiency level