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PDF AN11012 Data sheet ( Hoja de datos )
| Número de pieza | AN11012 | |
| Descripción | Using the TEA1703 to reduce standby power | |
| Fabricantes | NXP Semiconductors | |
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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
5. Application diagram
Figure 1 shows the TEA1703 connections in a typical application.
fly 1
fly 2
R1 C3
47 Ω 220 pF
D1
STMS20M100ST
C1
680 μF
25 V
C2
680 μF
25 V
Vout
19.5 V
3.34 A
GND
D2
BAS21
R2
330 kΩ
C4
47 nF
R3
220 kΩ
R6
2.2 MΩ
R4
4.7 MΩ
R5
360 kΩ
C5
100 pF
1
U2-1
2
L1
10 mH
U1
VSENSE
8
PSENSE
7
SWDET
6
n.c.
5
TEA1703
VCC
1
GND
2
OPTO
3
n.c.
4
Fig 1. TEA1703 connections in a typical application
019aab497
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.
5 of 36
5 Page 
NXP Semiconductors
AN11012
Using the TEA1703 to reduce standby power
7.1 General description and typical application
Figure 5 shows a typical application of the TEA1738 low cost SMPS controller and the
TEA1703 Standby controller. During Standby operation, optocoupler U4 forces
VINSENSE (pin 5 of the TEA1738) low via transistor Q3. The SMPS stops switching when
the voltage on VINSENSE drops below 0.72 V.
7.2 Interfacing
To reduce standby power consumption, the AP431 reference (U4 in Figure 5) and the
resistor divider R23 and R24 are switched off in standby by means of Q1. This reduces
the standby power by 5 mW to 10 mW. The values of R26, R27 and C18 are not critical.
Resistors R26 and R27 reduce the maximum gate voltage and C18 creates a switch off
delay. See the switching signals in Figure 6. Until the output voltage reaches the minimum
value, the power consumption is minimal.
Alternatively R26 and R27 can be increased to reduce the standby power consumption.
This, however, reduces the accuracy of the output voltage because of the spread on the
reference input current of the AP431.
AN11012
Application note
019aab502
Fig 6. AP431SR voltage reference on/off switching
The standby information for the SMPS is obtained via optocoupler U4. The collector of the
optocoupler is not connected directly to pin VINSENSE but via transistor Q3. This is
necessary to comply with dark current requirements. Dark currents up to 10 μA can be
managed.
Remark: Dark current is the current that can flow through the output phototransistor when
it is turned off.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 30 March 2011
© NXP B.V. 2011. All rights reserved.
11 of 36
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN11012.PDF ] | |
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