TEA1708T
GreenChip X capacitor discharge IC
Rev. 1.1 — 6 April 2020
1
Product data sheet
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.
2
Features and benefits
•
•
•
•
•
•
•
3
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
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
TEA1708T/1
Package
Name
Description
Version
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
5
Marking
Table 2. Marking codes
6
Type number
Marking code
TEA1708T/1
TEA1708
Block diagram
HV1
500 V
1 µA
1.2 V
TMR1
20 V
TMR2
500 V
HV2
aaa-007783
Figure 1. TEA1708 block diagram
TEA1708T
Product data sheet
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
7
Pinning information
7.1 Pinning
n.c.
1
TMR2
2
n.c.
3
TMR1
4
IC
8
HV1
7
n.c.
6
n.c.
5
HV2
aaa-007784
Figure 2. TEA1708 pinning diagram
7.2 Pin description
Table 3. Pin description
TEA1708T
Product data sheet
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
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
8
Functional description
The TEA1708 incorporates a timer and a zero-crossing mains voltage detector. If a
positive or negative voltage exceeding 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.
Mains disconnect
AC Mains
TMR voltage
1.2 V
aaa-007788
Figure 3. Functional behavior
To protect the IC during mains surges, a high-voltage clamping circuit is integrated. The
clamping circuit is activated for positive and negative voltages > 500 V. The high-voltage
pins HV1 and HV2 are fully symmetrical.
TEA1708T
Product data sheet
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4 / 12
TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
9
Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
Voltages
VTMR1-TMR2
voltage between pin TMR1 0 μA > Idch(tmr) < 10 μA
and pin TMR2
−0.4
+3.5
V
VHV1-HV2
voltage between pin HV1
and pin HV2
normal operation, so no
mains surge
−410
+410
V
current on pin HV
both HV pins; t < 2 ms,
during mains surge
−15
+15
mA
Ptot
total power dissipation
Tamb < 75 °C
-
0.5
W
Tstg
storage temperature
−55
+150
°C
Tj
junction temperature
−40
+150
°C
-
1000
V
-
4000
V
-
750
V
Currents
IHV
General
ESD
VESD
electrostatic discharge
voltage
class 1
human body model
(HBM);
pins HV1 and HV2
[1]
human body
model(HBM);
all other pins
charged device model
(CDM);
all pins
[1]
[2]
[2]
Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.
Equivalent to discharging a 200 pF capacitor through a 0.75 μH coil and a 10 Ω resistor.
10 Thermal characteristics
Table 5. Thermal characteristics
TEA1708T
Product data sheet
Symbol
Parameter
Conditions
Typ
Unit
Rth(j-a)
thermal resistance from
junction to ambient
in free air; JEDEC test board
160
K/W
Rth(j-c)
thermal resistance from
junction to case
in free air; JEDEC test board
72
K/W
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
11 Characteristics
Table 6. Characteristics
Tamb = 25 °C; currents are positive when flowing into the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
High voltage (pins HV1 and HV2)
IHV
current on pin HV
Vclamp
clamp voltage
Vth(ch)
charge threshold voltage
both HV pins; VHV1 > 50 V; VHV2 > 50 V
VTMR < 1.2 V
2.5
3.5
4.5
μA
current limited;
VTMR > 1.2 V
1.8
2.3
2.8
mA
475
500
525
V
threshold zero-crossing mains
voltage
19
21
23
V
to discharge the X-capacitor
1.1
1.2
1.3
V
−1.20
−0.95
−0.70
μA
Timer (pins TMR1 and TMR2)
Vth(act)dch
discharge activation threshold
voltage
Idch(tmr)
timer discharge current
12 Application information
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 kΩ 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 Xcapacitor.
The delay time (td) for discharge can be calculated with Equation 1:
(1)
If the low-voltage capacitor value is 22 nF the delay time is:
When the voltage across the device exceeds the threshold zero-crossing mains
voltage, the discharge current is activated. The current is limited to ≊ 2.3 mA. When the
current < the current limit, IHV is calculated with Equation 2:
(2)
TEA1708T
Product data sheet
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
When the X-capacitor value is 330 nF and R1 = R2 = 200 kΩ, the capacitor is discharged
to a voltage < 60 V at a mains of 230 V (AC) in 300 ms.
L
R2
200 kΩ
AC
HV2
5
4
TMR1
n.c.
6
3
n.c.
2
TMR2
1
n.c.
X capacitor
AC/DC application
10 nF
n.c.
7
HV1
8
R1
200 kΩ
N
aaa-007792
Figure 4. TEA1708 application diagram
To ensure that the capacitor is discharged to a voltage < 60 V within 2 seconds,
use R1 = R2 = 200 kΩ for X-capacitor values < 1.8 μF. 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
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Rev. 1.1 — 6 April 2020
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
13 Package outline
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
D
E
A
X
c
y
HE
v M A
Z
5
8
A2
Q
A
(A 3)
A1
pin 1 index
θ
Lp
1
L
4
e
detail X
w M
bp
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (2)
e
HE
L
Lp
Q
v
w
y
Z (1)
mm
1.75
0.25
0.10
1.45
1.25
0.25
0.49
0.36
0.25
0.19
5.0
4.8
4.0
3.8
1.27
6.2
5.8
1.05
1.0
0.4
0.7
0.6
0.25
0.25
0.1
0.7
0.3
0.01
0.019 0.0100 0.20
0.014 0.0075 0.19
0.16
0.15
inches
0.010 0.057
0.069
0.004 0.049
0.05
0.244
0.039 0.028
0.041
0.228
0.016 0.024
0.01
0.01
0.028
0.004
0.012
θ
o
8
o
0
Notes
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT96-1
076E03
MS-012
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-18
Figure 5. Package outline SOT96-1 (SO8)
TEA1708T
Product data sheet
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Rev. 1.1 — 6 April 2020
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
14 Revision history
Table 7. Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
TEA1708T_1 v.1.1
20200406
Product data sheet
-
TEA1708T_1 v.1
TEA1708T_1 v.1
20130925
Product data sheet
-
-
TEA1708T
Product data sheet
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
15 Legal information
15.1 Data sheet status
Document status
[1][2]
Product status
[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product
development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
[2]
[3]
Please consult the most recently issued document before initiating or completing a design.
The term 'short data sheet' is explained in section "Definitions".
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple
devices. The latest product status information is available on the Internet at URL http://www.nxp.com.
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
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Draft — The document is a draft version only. The content is still under
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with the same product type number(s) and title. A short data sheet is
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TEA1708T
Product data sheet
Suitability for use — NXP Semiconductors products are not designed,
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Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those
given in the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
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products are sold subject to the general terms and conditions of commercial
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
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NXP Semiconductors accepts no liability for inclusion and/or use of nonautomotive qualified products in automotive equipment or applications. In
the event that customer uses the product for design-in and use in automotive
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15.4 Trademarks
Notice: All referenced brands, product names, service names and
trademarks are the property of their respective owners.
GreenChip — is a trademark of NXP B.V.
TEA1708T
Product data sheet
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TEA1708T
NXP Semiconductors
GreenChip X capacitor discharge IC
Contents
1
2
3
4
5
6
7
7.1
7.2
8
9
10
11
12
13
14
15
General description ............................................ 1
Features and benefits .........................................1
Applications .........................................................1
Ordering information .......................................... 1
Marking .................................................................2
Block diagram ..................................................... 2
Pinning information ............................................ 3
Pinning ............................................................... 3
Pin description ................................................... 3
Functional description ........................................4
Limiting values .................................................... 5
Thermal characteristics ......................................5
Characteristics .................................................... 6
Application information ......................................6
Package outline ...................................................8
Revision history .................................................. 9
Legal information .............................................. 10
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. 2020.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 6 April 2020
Document identifier: TEA1708T