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TEA1708T Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer TEA1708T
Beschreibung GreenChip X capacitor discharge IC
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 11 Seiten
TEA1708T Datasheet, Funktion
TEA1708T
GreenChip X capacitor discharge IC
Rev. 1 — 25 September 2013
Product data sheet
1. 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 kresistors, 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.
The very low power consumption in combination with a large discharge current enables
the use of a large value X capacitor to reduce EMI while retaining the low standby power.
2. 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 kresistors
Easier application design, resolving EMI issues while retaining the efficiency level
3. Applications
All AC connected power supplies with X capacitors > 100 nF requiring a low load
standby power.
4. Ordering information
Table 1. Ordering information
Type number
Package
Name
Description
TEA1708T
SO8
plastic small outline package; 8 leads; body width 3.9 mm
Version
SOT96-1






TEA1708T Datasheet, Funktion
NXP Semiconductors
TEA1708T
GreenChip X capacitor discharge IC
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Fig 4. TEA1708T application diagram
DDD
Use R1 = R2 = 200 kfor X-capacitor values < 1.8 F to ensure that the capacitor is
discharged to a voltage < 60 V within 2 seconds. Lowering R1 + R2, for faster discharge
or when a higher value for the X capacitor is required is possible but it decreases the
surge protection level.
TEA1708T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 25 September 2013
© NXP B.V. 2013. All rights reserved.
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