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參數(shù)資料
| 型號： | 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)： | 33/47頁 |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028 |
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- Full protection of the primary-connected transis-
tor in case of short-circuit oropen-loadon secon-
dary terminals
- Can provide 1W to 7W, for TV standby mode
operation(referto TEA2164applicationnote).
V.7.4 - Powersupply soft-start
WhentheTVsetisinitiallyturnedon,controlpulses
are not yetavailable andconsequentlythe control-
ler block on primary side will impose a low-power
transfer to the secondary winding. This power is
produced by anintermittent switching mode called
”BurstMode”.
As soon as the V
CC
supplyto TEA2028Bexceeds
6V level,lineandSMPSoutputsareenabled.Since
the filteringcapactitors on secondary side cannot
charge up instantaneously,the voltageto be regu-
lated wouldnot yet be atits nominalvalue. Without
conduction period limitation upon start-up,the de-
vice will set a maximum cycle of 28
μ
s which will
result in a high current flow through the primary
winding and thus through the switching transistor
which will in turn activate the protection function
implemented on primary side.
Consequently, the primary controller block will be
inhibitedand the setwill not turn-on.
A start-up system has been implemented within
Figure66
TEA2028Bto overcomethis problem.
This soft start system, will upon initial start-up, use
the image of the falling voltage on Pin 15 to in-
crease progressively the conduction cycle. The
phase modulator ”M2” compares this voltage with
linesaw-toothvoltageanddeliversthecorrespond-
ing limitationcycle.
During supply voltage rising cycle [V
CC
(Pin 8)
< 6V], the capacitor Pin 15 will charge up rapidly
while the voltage across it follows V
CC
.
At V
CC
≥
6V, the capacitor is discharged via an
internal current generatorand the voltageacrossit
decays linearly.
At V
15
≤
3.5V (line saw-tooth peak-to-peak volt-
age), phase comparator ”M2” delivers a low con-
ductionperiod which will graduallyincrease.
The conduction period (Pin 7) will rise until the
secondaryvoltage reachesthe valuesetby poten-
tiometer ”P”. When this occurs, the loop is acti-
vated.
The Pin 15 dischargecurrent value is 100
μ
Afor a
duration of 2
μ
s line frequency.
ThereforeI
D
(
AV
)
=
100
×
2
64
=
3.1
μ
A
Conductionperiod limitationvoltage (Pin 15)
T
ON(LIM)
= 56
μ
s - 16 x V
15
(in
μ
s)
5.5V
5.5V
12V
6
6
3.5
t
t
t
t
V
CC
V
CC
V
CC
Soft-start area
Regulated Mode
Active area
PIN 8 SUPPLY
VOLTAGE (V)
PIN 15
VOLTAGE (V)
SMPS CONTROL
OUTPUTVOLTAGE
(PIN 7)
LINE OUTPUT
VOLTAGE (PIN 10)*
* Lineoutput (Pin 10) andThyristo rcontrol output (Pin 4) for TEA2029C
2
TEA2028 - TEA2029 APPLICATIONNOTE
33/46
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TEA2028B | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2128 | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2164S | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2029C | COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2031A | COLOR TV EAST-WEST CORRECTION |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA2028B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2028-TEA2029 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:APPLICATION NOTE |
| TEA2029 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:APPLICATION NOTE |
| TEA2029C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2029CV | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Timing Processor (LINE, FRAME, SMPS) for TV Sets |
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