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PDF TEA1708T Data sheet ( Hoja de datos )
| Número de pieza | TEA1708T | |
| Descripción | GreenChip X capacitor discharge IC | |
| Fabricantes | NXP Semiconductors | |
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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 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
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
1 page  
NXP Semiconductors
TEA1708T
GreenChip X capacitor discharge IC
10. Characteristics
Table 5. Characteristics
Tamb = 25 C; currents are positive when flowing into the IC; unless otherwise specified.
Symbol Parameter
Conditions
Min
High voltage (pins HV1 and HV2)
IHV current on pin HV
Vclamp
Vth(ch)
clamp voltage
charge threshold voltage
on both HV pins;
VHV1 > 50 V;
VHV2 > 50 V
VTMR < 1.2 V
current limited;
VTMR > 1.2 V
threshold
zero-crossing mains
voltage
2.5
1.8
475
19
Timer (pins TMR1 and TMR2)
Vth(act)dch discharge activation threshold
voltage
to discharge the X
capacitor
1.1
Idch(tmr)
timer discharge current
1.20
Typ
3.5
2.3
500
21
1.2
0.95
11. Application information
Max
4.5
2.8
525
23
1.3
0.70
Unit
A
mA
V
V
V
A
TEA1708T
Product data sheet
The TEA1708 is typically connected across the X capacitor. A metal oxide varistor is not
required to protect the IC because the device incorporates a high-voltage clamping circuit.
The IC is sufficiently protected for differential mode surge voltages up to 4 kV with only
two 200 k resistors (see Figure 4).
The discharge delay time is set externally using a low-voltage capacitor connected
between the TMR1 and TMR2 pins. Select a value between 10 nF and 22 nF for a mains
frequency of 50 Hz or 60 Hz. The minimum value is 10 nF which gives the smallest delay
time. Do not use values < 10 nF. They can lead to unwanted discharge of the X capacitor.
The delay time (td) for discharge can be calculated with Equation 1:
td
=
Ctmr
V----t--h----a---c--t----d--c---h
Idchtmr
(1)
If the low-voltage capacitor value is 22 nF the delay time is: 22 nF -11---.-2-----AV-- = 26 ms .
The discharge current is activated when the voltage across the device exceeds the
threshold zero-crossing mains voltage. The current is limited to 2.3 mA. When the
current < the current limit, IHV is calculated with Equation 2:
IHV1
=
IHV2
-V---x---c--a---p----t-----–-------V---t--h-----c--h-----+-----4------V----
R1 + R2
(2)
When the X capacitor value is 330 nF and R1 = R2 = 200 k, the capacitor is discharged
to a voltage < 60 V at a mains of 230 V (AC) in 300 ms.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 25 September 2013
© NXP B.V. 2013. All rights reserved.
5 of 11
5 Page 
NXP Semiconductors
16. Contents
1 General description . . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4 Ordering information . . . . . . . . . . . . . . . . . . . . . 1
5 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
6 Pinning information . . . . . . . . . . . . . . . . . . . . . . 2
6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 2
7 Functional description . . . . . . . . . . . . . . . . . . . 3
8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 4
9 Thermal characteristics . . . . . . . . . . . . . . . . . . 4
10 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 5
11 Application information. . . . . . . . . . . . . . . . . . . 5
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . . 7
13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . 8
14 Legal information. . . . . . . . . . . . . . . . . . . . . . . . 9
14.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 9
14.2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
14.3 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
14.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
15 Contact information. . . . . . . . . . . . . . . . . . . . . 10
16 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TEA1708T
GreenChip X capacitor discharge IC
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2013.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 25 September 2013
Document identifier: TEA1708T
11 Page | ||
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| PDF Descargar | [ Datasheet TEA1708T.PDF ] | |
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