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參數(shù)資料
| 型號(hào)： | TDA9115 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 偏轉(zhuǎn) |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封裝： | SHRINK, PLASTIC, DIP-32 |
| 文件頁(yè)數(shù)： | 25/45頁(yè) |
| 文件大?。?/td> | 675K |
| 代理商： | TDA9115 |
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TDA9115
31/45
Figure 13. EWOut output waveforms
9.6 DYNAMIC CORRECTION OUTPUT
SECTION
9.6.1 Vertical Dynamic Correction output
VDyCor
A parabola at vertical deflection frequency is avail-
able on pin VDyCor. Its amplitude is adjustable via
VDC-AMP I2C bus control. It tracks with real verti-
cal amplitude and position (including breathing
compensation). It is also affected by C- and S-cor-
rections.
The use of this correction waveform is up to the
application (e.g. dynamic focus).
9.7 DC/DC CONTROLLER SECTION
The section is designed to control a switch-mode
DC/DC converter. A switch-mode DC/DC conver-
tor generates a DC voltage from a DC voltage of
different value (higher or lower) with little power
losses. The DC/DC controller is synchronized to
horizontal deflection frequency to minimize poten-
tial interference into the picture.
Its operation is similar to that of standard UC3842.
The schematic diagram of the DC/DC controller is
in Figure 14. The BOut output controls an external
switching circuit (a MOS transistor) delivering
pulses synchronized on horizontal deflection fre-
quency, the phase of which depends on I2C bus
configuration, see the table at the end of this chap-
ter. Their duration depends on feedback provided
to the circuit, generally a copy of DC/DC converter
output voltage and a copy of current passing
through the DC/DC converter circuitry (e.g. current
through external power component). The polarity
of the output can be controlled by BOutPol I2C bus
bit. A NPN transistor open-collector is routed out to
the BOut pin.
During the operation, a sawtooth is to be found on
pin BISense, generated externally by the applica-
tion. According to BOutPh I2C bus bit, the R-S flip-
flop is set either at H-drive signal edge (rising or
falling, depending on BOHEdge I2C bus bit), or a
Keystone
PCC
alone
V(VCap)
0
TVR
0
V(EWOut)
o
p
e
rat
ing
ra
ng
e
VEW-PCC
VEW-Key
V
EW
VEW-DC
V(HEHT)
VRefO
VHEHT(min)
HSIZE (I2C)
min
imu
m
med
ium
max
imu
m
VEW(min)
VEW(max)
n
on-
autho
ri
zed
reg
io
n
Vertical sawtooth
tVR
V(VCap)
0
TVR
0
VRefO
VHEHT(min)
Breathing
compensation
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