TEA1708T/1J Datasheet TEA1708T/1J | P1-P3

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 k 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.

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 k resistors

 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

TEA1708T

GreenChip X capacitor discharge IC

Rev. 1 — 25 September 2013 Product data sheet

Table 1. Ordering information

Type number Package

Name Description Version

TEA1708T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1

Product data sheet Rev. 1 — 25 September 2013 2 of 11

NXP Semiconductors

TEA1708T

GreenChip X capacitor discharge IC

5. Block diagram

6. Pinning information

6.1 Pinning

6.2 Pin description

Fig 1. TEA1708T block diagram

DDD

9

705

+9

+9

705

9

9

$

Fig 2. TEA1708T pinning diagram

QF

+9

705 QF

QF

705 +9

DDD

















Table 2. Pin description

Symbol Pin Description

n.c. 1 not connected

TMR2 2 timer pin 2

n.c. 3 not connected

TMR1 4 timer pin 1

HV2 5 high-voltage mains connection 2

n.c. 6 not connected

n.c. 7 not connected

HV1 8 high-voltage mains connection 1

Product data sheet Rev. 1 — 25 September 2013 3 of 11

NXP Semiconductors

TEA1708T

GreenChip X capacitor discharge IC

7. Functional description

The TEA1708 incorporates a timer and a zero-crossing mains voltage detector. If a

positive or negative voltage above the threshold zero-crossing mains voltage (20 V) is

applied between the high-voltage pins, the timer charges the external capacitor on the

TMR1 and TMR2 pins. If the voltage between the TMR1 and TMR2 pins reaches 1.2 V, a

discharge current is activated. If the voltage applied between the high-voltage pins, is

below the threshold zero-crossing mains voltage, the external capacitor is discharged and

the discharging stops. The discharge current is internally limited.

When an AC mains voltage is applied, the timer capacitor is charged between the mains

zero crossings and discharged during the mains zero crossings. When the AC mains is

disconnected and a high voltage remains on the X capacitor, the timer charges the

external capacitor above its discharge activation threshold voltage point (1.2 V), switching

on the internally limited discharge current of the external X capacitor.

To protect the IC during mains surges, a high voltage clamping circuit is integrated. The

clamping circuit is activated for > 500 V positive and negative voltages. The high-voltage

pins HV1 and HV2 are fully symmetrical.

Fig 3. Functional behavior

DDD

0DLQVGLVFRQQHFW

$&0DLQV

705YROWDJH 9

P1-P3 P4-P6 P7-P9 P10-P11

TEA1708T/1J

Mfr. #:

Buy TEA1708T/1J

Manufacturer:

NXP Semiconductors

Description:

Power Management Specialized - PMIC TEA1708T/SO8//1/REEL 13 Q1 NDP

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

TEA1708T/1J