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PDF AN10981 Data sheet ( Hoja de datos )
| Número de pieza | AN10981 | |
| Descripción | GreenChip TEA1738 series fixed frequency flyback controller | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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AN10981
GreenChip TEA1738 series fixed frequency flyback controller
Rev. 1.1 — 18 April 2011
Application note
Document information
Info Content
Keywords
GreenChip, TEA1738, SMPS, flyback, adapter, notebook, LCD monitor.
Abstract
The TEA1738 is a low cost member of the GreenChip family. It is a
fixed-frequency flyback controller intended for power supplies up to 75 W
for applications such as notebooks, printers and LCD monitors.
http://www.Datasheet4U.com
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R26 C18
F1
L
3.15 A LF2
250 V
N
CX1
330 nF
275 V
R1
1.5 MΩ
BD1
KBP206G
LF1 BD1b
BD1d
R2
1.5 MΩ
BD1a
BD1c
R4
3.3 MΩ
R5
3.3 MΩ
R6
3.3 MΩ
C1
120 μF
400 V
C2
4.7 nF
500 V
R9
43 kΩ
R10
43 kΩ
C3
2.2 nF
630 V
D1
SA2M
2
3
1
option option
D9
MBR20100
6 D10
7
C13
680 μF
25 V
C19
option
R20
330 Ω
ZD1
BZX84J-B24
RT1 NTC
470 kΩ at 25 °C
11.2 kΩ at 110 °C
Θ
R17
5.1 kΩ
1%
U2-1
LVT-356T
R7
82 kΩ
VINSENSE
5
C6
470 nF
U1
ISENSE
4
PROTECT
6
C10
DRIVER
3
100 nF
TEA1738
CTRL
7
C9
GND
2
10 nF
OPTIMER
8
VCC
1
C8
220 nF
R16
2.2 MΩ
C11
4.7 mF
50 V
C7a
option
R15
R18 D3
6.8 μH
BAS21W
R13
1 kΩ
R14
Q1
2SK3569
4.7 Ω
10 Ω
D2
R12
1N4148W
33 kΩ
C5
C7
100 nF
50 V
220 nF
RM10
Lp = 600 μH U2-2
LVT-356T
4
5
C4
100 pF
1 kV
U3
AP431SR
R21
option
C15
option
C16 R22
10 nF 10 kΩ
R11
0.15 Ω
CY1
2.2 nF
400 V
BC1
(ferrite bead)
+ 19.5 V
3.34 A
C14
680 μF
25 V
GND
R25
option
R23
35.7 kΩ
1%
C17
option
R24
5.1 kΩ
1%
019aab060
Fig 1. Typical TEA1738 application schematic
5 Page 
NXP Semiconductors
AN10981
GreenChip TEA1738 series fixed frequency flyback controller
2.0 019aaa158
1.8
1.6
115 V (AC)
1.4
1.2
90 V (AC)
1.0
0.8
0.6
1234
start-up time (s)
Fig 4. Start-up resistor value as a function of start-up time (VCC capacitance 4.8 μF)
100
power at 230 V (AC)
(mW)
80
019aaa159
60
90 V (AC)
40 115 V (AC)
20
1234
start-up time (s)
Fig 5. Power consumption of start-up circuit at 230 V (AC) as a function of start-up time
(VCC capacitance 4.8 μF)
Figure 5 shows the power consumed by the combined start-up and X-cap discharge
circuit as a function of the start-up time. The graph shows how to save power:
• More than 10 mW no-load power can be saved by increasing the start-up time
(at 115 V (AC)) from 2 s to 3 s.
• Approximately 17 mW no-load power can be saved by specifying the start-up time at
115 V (AC) instead of 90 V (AC).
AN10981
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 18 April 2011
© NXP B.V. 2011. All rights reserved.
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AN10981.PDF ] | |
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