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PDF AN10868 Data sheet ( Hoja de datos )
| Número de pieza | AN10868 | |
| Descripción | GreenChip TEA1733 series fixed frequency flyback controller | |
| Fabricantes | NXP Semiconductors | |
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AN10868
GreenChip TEA1733 series fixed frequency flyback controller
Rev. 3.1 — 22 May 2013
Application note
Document information
Info Content
Keywords
GreenChip, TEA1733, SMPS, flyback, adapter, notebook, LCD monitor.
Abstract
The TEA1733 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
C6 5
470 nF
U1
ISENSE
4
PROTECT
C10 6
DRIVER
3
100 nF
TEA1733
CTRL
C9 7
10 nF
GND
2
OPTIMER
8
VCC
1
C8
220 nF
R16
2.2 MΩ
C11
4.7 μF
50 V
C7a
option
R15
4.7 Ω
C7
100 nF
50 V
R18 D3
6.8 μH
BAS21W
R13
1 kΩ
R14
10 Ω
D2
1N4148W
Q1
2SK3569
R12
33 kΩ
C5
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%
019aaa154
Fig 1. Typical TEA1733 application schematic
5 Page 
NXP Semiconductors
AN10868
GreenChip TEA1733 series fixed frequency flyback controller
L
CX1
N
R1
BD1b
BD1a
R2
BD1d
BD1c
C1
C11 + C7
VCC
019aaa156
a. Start-up circuit with two resistors
Fig 3. Start-up circuit with two resistors
L
VCC
N
R1
C11 + C7
R2
BD1b
C1
BD1d
BD1a
BD1c
019aaa157
b. Simplified representation
Figure 3b, shows the circuit shown in Figure 3a but drawn to show more clearly how the
VCC capacitor is charged. Once the bulk capacitor C1 is fully charged, diode c and
diode d stop conducting. During the positive half mains cycle diode a conducts and the
current through R1 charges the VCC capacitor (C11 + C7). During this positive half cycle,
part of the charge current leaks away into R2. The worst case current that leaks into R2
occurs is when the VCC capacitor is almost charged:
Ileak
==V----s--t--a---r--t-u--p--
R2
1-2-.-20-.--6M---V---- = 17 A
(1)
The value of R1 and R2 must be low enough to ensure the required discharge time of the
X-cap (RC < 1 s) and also low enough to obtain an acceptable start-up time at low mains
voltage. But it must also be chosen to be as high as possible to keep the no-load power
consumption as low as possible.
Some examples of start-up times for different resistors are shown in Table 3.
Table 3. Start-up times for different start-up resistor values
VCC capacitance: 4.7 F + 100 nF = 4.8 F.
Resistor R1 = R2
Start-up time at
90 V (AC)
Start-up time at
115 V (AC)
680 k
1.6 s
1.1 s
820 k
2.0 s
1.4 s
1 M
2.5 s
1.75 s
1.2 M
3.1 s
2.1 s
1.5 M
4.15 s
2.75 s
Power at 230 V (AC)[1]
70 mW
59 mW
48 mW
40 mW
33 mW
[1] Power consumption of the combined X-cap discharge and start-up circuit at 230 V (AC).
AN10868
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 May 2013
© NXP B.V. 2013. All rights reserved.
11 of 46
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| PDF Descargar | [ Datasheet AN10868.PDF ] | |
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