參數(shù)資料
型號(hào)： TDA9113
廠(chǎng)商： STMICROELECTRONICS
元件分類(lèi)： 偏轉(zhuǎn)
英文描述： HORIZ/VERT DEFLECTION IC, PDIP32
封裝： SHRINK, PLASTIC, DIP-32
文件頁(yè)數(shù)： 30/50頁(yè)
文件大?。?/td> 755K
代理商： TDA9113
TDA9113
36/50
Figure 14. HDyCor 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 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
certain delay (tBTrigDel /TH) after middle of H-fly-
back. The output is set On at the end of a 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 C2 if
the voltage on pin BISense exceeds the internal
threshold VThrBIsCurr. This represents current limi-
tation if a voltage proportional to the current
through the power component or deflection stage
is available on pin BISense. This threshold is af-
fected by the voltage on pin HPosF, which rises at
soft start and descends at soft stop. This ensures
self-contained soft control of duty cycle of the out-
put signal on pin BOut. Refer to Figure 10. Another
TH
tHVD-Hoffset
VHVD-H
HDyCorPh
VHVD-DC
Shaped H-flyback
(I2C)
1
0
tHVD-Hoffset
(min)
(max)
tHVD-Hflat
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TDA9115 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR
TDA9116 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR
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TDA9141 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:PAL/NTSC/SECAM decoder/sync processor
TDA9143 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:I2C-bus controlled, alignment-free PAL/NTSC/SECAM decoder/sync processor
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