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TEA1708T の電気的特性と機能

TEA1708TのメーカーはNXP Semiconductorsです、この部品の機能は「GreenChip X capacitor discharge IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 TEA1708T
部品説明 GreenChip X capacitor discharge IC
メーカ NXP Semiconductors
ロゴ NXP Semiconductors ロゴ 




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TEA1708T Datasheet, TEA1708T PDF,ピン配置, 機能
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

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TEA1708T pdf, ピン配列
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.
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Fig 3. Functional behavior
DDD
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.
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.
3 of 11


3Pages


TEA1708T 電子部品, 半導体
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.
6 of 11

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部品番号部品説明メーカ
TEA1708T

GreenChip X capacitor discharge IC

NXP Semiconductors
NXP Semiconductors


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