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參數(shù)資料
| 型號(hào)： | TDA9112 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 偏轉(zhuǎn) |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封裝： | PLASTIC, SDIP-32 |
| 文件頁數(shù)： | 31/51頁 |
| 文件大小： | 809K |
| 代理商： | TDA9112 |
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TDA9112
37/51
pensation). It is also affected by C- and S-correc-
tions.
The use of both correction waveforms is up to the
application (e.g. dynamic focus).
Figure 14. HVDyCor output horizontal component waveform
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 15. 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 H/W and
I2C bus configuration, see the table at the end of
this chapter. Their duration depends on the feed-
back provided to the circuit, generally a copy of
DC/DC converter output voltage and a copy of cur-
rent 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-collec-
tor is routed out to the BOut pin.
9.7.1 - External sawtooth configuration
External sawtooth configuration is assumed when
the voltage on BISense pin is lower than VThrBIs-
Conf threshold. During the operation, a sawtooth is
to be found on pin BISense, generated externally
by the application. The switches S1 and S2 are in
“ext.” position. 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 certain delay (tBTrigDel /TH) after middle
of H-flyback. The output is set On at the end of the
short pulse generated by the monostable trigger.
Timing of reset of the R-S flip-flop affects duty cy-
cle of the output square signal and so the energy
transferred from DC/DC converter input to its out-
put. A reset edge is provided by comparator C3 if
TH
tHVD-Hoffset
VHVD-H
HDyCorPh
VHVD-DC
Shaped H-flyback
(I2C)
1
0
tHVD-Hoffset
(min)
(max)
tHVD-Hflat
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| TDA9116 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
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