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參數(shù)資料
| 型號(hào)： | TDA9112 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 偏轉(zhuǎn) |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封裝： | PLASTIC, SDIP-32 |
| 文件頁(yè)數(shù)： | 33/51頁(yè) |
| 文件大?。?/td> | 809K |
| 代理商： | TDA9112 |
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TDA9112
39/51
Figure 15. DC/DC converter controller block diagram
9.8 - MISCELLANEOUS
9.8.1 - Safety functions
The safety functions comprise supply voltage
monitoring with appropriate actions, soft start and
soft stop features on H-drive and B-drive signals
on HOut and BOut outputs and X-ray protection.
For supply voltage supervision, refer to paragraph
Power supply and voltage references on page 27
and Figure 1. A schematic diagram putting togeth-
er all safety functions and composite PLL1 lock
and V-blanking indication is in Figure 16.
9.8.2 - Soft start and soft stop functions
For soft start and soft stop features for H-drive and
B-drive signal, refer to paragraph Soft-start and
soft-stop
on
H-drive
on
page 31
and
subchapter DC/DC CONTROLLER SECTION on
page 37, respectively. See also the Figure 10. Re-
gardless why the H-drive or B-drive signal are
switched on or off (I2C bus command, power up or
down, X-ray protection), the signals always phase-
in and phase-out in the way drawn in the figure,
the first to phase-in and last to phase-out being the
H-drive signal, which is to better protect the power
stages at abrupt changes like switch-on and off.
The timing of phase-in and phase-out only de-
pends on the capacitance connected to HPosF pin
which is virtually unlimited for this function. Yet it
has a dual function (see paragraph PLL1 on
page 28), so a compromise thereof is to be found.
9.8.3 - X-ray protection
The X-ray protection is activated if the voltage lev-
el on XRay input exceeds VThrXRay threshold. As a
consequence, the H-drive and B-drive signals on
HOut and BOut outputs are inhibited (switched off)
after a 2-horizontal deflection line delay provided
to avoid erratic excessive X-ray condition detec-
tion at short parasitic spikes. The XRayAlarm I2C
bus flag is set to 1 to inform the MCU.
This protection is latched; it may be reset either by
VCC drop or by I
2C bus bit XRayReset(see chapter
I2C BUS CONTROL REGISTER MAP).
HDyCor
C2
+
-
C4
BRegIn
BComp
BIsense
BOut
N type
Soft start
H-drive edge
HDyCor sawtooth
H-flyback
+
-
+
-
+
-
C1
+
-
S
Q
R
~500ns
Monostable
HBOutEn
P type
VCC
Feedback
C3
sawtooth
VThrBIsConf
BOutPol
(I2C)
XRayAlarm
(I2C)
BOutPh
(I2C)
discharge
HPosF
VThrBIsCurr
int.
ext.
int.
ext.
int.
ext. External sawtooth configuration
Internal sawtooth configuration
(+delay)
BOHEdge
(I2C)
2R
R
VBReg
S1
S2
I1
I2
I3
VC2
O1
VC1
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