TEA1708T
TEA1708T is GreenChip X capacitor discharger manufactured by NXP Semiconductors.
description
The TEA1708 is an automatic discharge IC for X capacitors with a low power consumption (typically 1 m W 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 k V. A metal-oxide varistor is not required to protect the IC.
The X-capacitor discharge current is internally limited to 2.3 m A. 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.
2 Features and benefits
- 1 m W 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 k V with two 200 kΩ resistors
- Easier application design, resolving EMI issues while retaining the efficiency level
3 Applications
- All AC-connected power supplies with X-capacitors > 100 n F requiring a low load standby power.
4 Ordering information
Table 1. Ordering information
Type number
Package
Name
TEA1708T/1
SO8
Description plastic small outline package; 8 leads; body width 3.9 mm
Version SOT96-1
NXP Semiconductors
5 Marking
Table 2. Marking codes Type number
TEA1708T/1
6 Block diagram
Green Chip X capacitor discharge IC
Marking code TEA1708
HV1
500 V
1 µA
20 V
HV2
500 V
Figure 1. TEA1708 block diagram
1.2 V
TMR1 TMR2...
