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AN11012のメーカーはNXP Semiconductorsです、この部品の機能は「Using the TEA1703 to reduce standby power」です。 |
部品番号 | AN11012 |
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部品説明 | Using the TEA1703 to reduce standby power | ||
メーカ | NXP Semiconductors | ||
ロゴ | |||
このページの下部にプレビューとAN11012ダウンロード(pdfファイル)リンクがあります。 Total 30 pages
AN11012
Using the TEA1703 to reduce standby power
Rev. 1 — 30 March 2011
Application note
Document information
Info Content
Keywords
SMPS, TEA1703, TEA1738, TEA1753, standby power
Abstract
TEA1703 is a low power standby controller IC intended for use in SMPS
applications that require an extremely low no-load standby power. The
TEA1703 includes detection circuitry for output voltage, output power and
also switching detection circuitry. The TEA1703 integrates a switched
mode optocoupler driver which makes it possible to drive an optocoupler
with a high peak current, while keeping the required power low.
(NXP Semiconductors patent)
1 Page NXP Semiconductors
AN11012
Using the TEA1703 to reduce standby power
1. Introduction
The number of electronic products used today in private homes and offices is constantly
increasing. Most products, such as: audio equipment, TVs, digital cable receivers,
DVD/Blu ray recorders, computers, printers, etc. consume a considerable amounts of
electrical power while on standby (when they are not in use but are still connected to the
mains supply). This not only is a waste of energy and money but also has a large impact
on the environment. Today, many products required to run in Standby mode have to
comply with requirements on energy consumption like the Energy Star 2.0 APS
requirements.
The TEA1703 is a low power standby controller IC intended to be used in SMPS
applications that require an extreme low no-load standby power. The TEA1703 includes
detection circuitry for output voltage, output power and also switching detection circuitry.
The TEA1703 integrates a switched mode optocoupler driver, which makes it possible to
drive an optocoupler with a high peak current, while keeping the required power low.
(NXP Semiconductors patent). using the TEA1703, the standby power consumption of a
SMPS is reduced to 30 mW or less.
Remark: Unless otherwise stated all values given in this application note are typical
values.
2. Scope and set-up of this application note
2.1 Scope
This application note describes the functionality of the TEA1703 standby controller and
the operation in combination with the TEA1738 and TEA1753 SMPS controllers. Detailed
application information is given on interfacing and performance optimization.
2.2 General setup of the application note
The setup of this document is made in such a way, that a section or paragraph on a
selected subject can be read as a stand-alone explanation with a minimum of cross
references to other document parts or the data sheet.
2.3 Related documents and tools
This application note gives no in depth application information on the TEA1738 or
TEA1753 SMPS controller. Application notes, data sheets, user manuals and design tools
can be found on the product pages for the TEA1703, TEA1738 and TEA1753 at
http://www.nxp.com.
3. TEA1703 features
AN11012
Application note
• SMPS standby controller IC enabling very low power standby operation
• Large input voltage range from 5 V up to 30 V
• Very low supply current of 30 μA
• Switched mode optocoupler driver output (NXP Semiconductors patent)
• Ease of application
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 30 March 2011
© NXP B.V. 2011. All rights reserved.
3 of 36
3Pages NXP Semiconductors
AN11012
Using the TEA1703 to reduce standby power
6. TEA1703 description and calculation
This section describes the TEA1703 functions and operation in a typical application.
6.1 General description
The TEA1703 is a standby controller IC that reduces the standby power of a switched
mode power supply. Standby mode operation information is obtained by sensing the
output voltage and the output power of the SMPS. The output voltage is measured at pin
VSENSE of the TEA1703 via the resistor divider R4 and R5 as shown in Figure 1. The
output power is measured at the flyback winding of the transformer via D2 and a low-pass
filter made by R2, R3 and C4 as shown in Figure 1.
The principle of output power measuring is based on SMPS converters where the output
power at low load increases with frequency, e.g. in a discontinuous conduction mode
flyback converter which has a fixed primary peak current during low load operation.
The block diagram (Figure 2) shows the VSENSE and PSENSE inputs and the
corresponding comparators. A SWDET input is added to disable Standby mode detection
e.g. when a latched protection is active. When pins VSENSE, PSENSE and SWDET have
the correct levels, the 28 kHz oscillator is enabled. The oscillator drives the MOSFET at
the OPTO pin with an on-time of 1.4 μS (4 % duty cycle). Pin OPTO drives the
optocoupler via a coil and disables the SMPS.
VCC 1
2
GND
REFERENCE
AND
SUPPLY
VOLTAGE SENSE
POWER SENSE
0.9 μA
8 VSENSE
1.22 V
0.5 V 7
PSENSE
OPTO 3
4
n.c.
OSCILLATOR
Fig 2. Block diagram
SWITCH
DETECT
1.2 μA 6 SWDET
5
n.c.
019aab498
6.2 Standby mode operation
The Standby mode operation signals are shown in Figure 3. In Standby mode the
optocoupler pulses generated by the TEA1703 disable the SMPS and consequently the
output voltage drops. When the voltage at pin VSENSE reaches 1.22 V, the 0.9 μA current
source is switched off and VSENSE drops below 1.22 V. The small hysteresis prevents
fast on/off switching of the VSENSE comparator.
AN11012
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 30 March 2011
© NXP B.V. 2011. All rights reserved.
6 of 36
6 Page | |||
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