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參數(shù)資料
| 型號(hào)： | TEA2028 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 18/47頁 |
| 文件大小： | 532K |
| 代理商： | TEA2028 |
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V.4 - Line saw-tooth generator
Beforegoingthroughadetailedstudyofthesecond
phase locked loop ”
φ
2”, let’s have an overview of
the linesaw-toothgeneratorwhichhasbeenmainly
implemented for
φ
2 phase variations and also the
phase modulation of the switching power supply.
It uses the combination of an external capacitor
connectedto Pin 13andan internallyimplemented
constantcurrentgeneratorto generatea saw-tooth
voltage at linefrequency.
Its frequencyis determinedby the reset frequency
of the capacitor ”C13”. This reset signal is issued
by thelinelogiccircuitry at aperiodmultipleof VCO
period (
×
32).
- I
C
= K
I
R
= K
1.26
R
14
- V
13PP
=I
C
(
T
H
t
reset
)
C13
= 3.48V
- V
CE(SAT)T1
≈
20mV
V
13(MAX)
= 3.5V
- In sync mode :
T
H
= 64
μ
s, t
RESET
= 6.5
μ
s, K = 0.527
±
2%
= 200
μ
A
=K
1.26
(
T
H
t
reset
)
R14
C13
13
14
x K
I
R
R14
3.32k
C13
3.3nF
Constant
1.26V
I
R
I
C
V+
CC
Reset
To
2
andSMPS
x 1
T1
Reset
6.5
μ
s
64
μ
s
T
H
V
13
V
PP
3.5
0
t
t
2
Figure34
0.3
μ
s
2.35
μ
s
2.35
μ
s
5.8
μ
s
6.5
μ
s
Inhibition
Inhibition
LINE SYNC.
1 SIGNAL
VIDEO
ON PIN 27
LINE
INHIBITION
2
Figure32
100
μ
A
(short)
500
μ
A
(Long)
1
&
&
&
Line Sync.
LS
Phase Comparator (
1)
S
INH(S)
INH(L)
S
&
≥
1
Video Recognition
Mute
FRI
&
FS
Line Inhibition
BLK
VCR
2
Figure 33 :
1 Inhibition LogicBlock Diagram
TEA2028 - TEA2029APPLICATIONNOTE
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