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參數(shù)資料
| 型號(hào)： | TDA9112A |
| 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)： | 44/60頁 |
| 文件大?。?/td> | 831K |
| 代理商： | TDA9112A |
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Obsolete
Product(s)
- Obsolete
Product(s)
TDA9112A
49/60
internal reference and so the output voltage is IC-
bus adjustable by means of
BREF IC-bus control.
Both step-up (DC/DC converter output voltage
higher than its input voltage) and step-down (out-
put voltage lower than input) can be built.
9.7.1
Synchronization of DC/DC controller
For sake of application flexibility, the output drive
signal on BOut pin can be synchronized with one of
four events in Table 9. For the first line case, the
synchronization instant is every second top of hor-
izontal VCO saw tooth. See Figure 7.
9.7.2
Soft-start and soft-stop on B-drive
The soft-start and soft-stop procedure is carried
out at each switch-on or switch-off of the B-drive
signal, either via HBOutEn IC-bus bit or after re-
set of XRayAlarm IC-bus flag, to protect external
power component. See Figure 10 and sub chapter
Safety functions
on page 50.
The drive signal on BOut pin can be switched off
alone by means of BMute IC-bus bit, without
switching off the drive signal on pin HOut. The
switch-off is quasi-immediate, without the soft-stop
procedure. At switching back on, the soft-start of
the DC/DC controller is performed, timed by an in-
ternal timing circuit, see Figure 18.
When BSafeEn IC-bus bit is enabled, the drive
signal on BOut pin will go off as soon as the hori-
zontal PLL1 indicates unlocked state, without the
soft-stop. Resuming of locked state will initiate the
soft-start mechanism of the DC/DC controller,
timed by an internal timing circuit.
Table 9. IDC/DC controller Off-to-On edge timing
Figure 18. DC/DC converter controller block diagram
BOutPh
(Sad07h/D7)
BOHEdge
(Sad17h/D3)
Timing of Off-to-On transition on BOut output
0
1
VCO ramp top at Horizontal frequency divided by two
0
Middle of H-flyback plus tBTrigDel
1
0
Falling edge of H-drive signal
1
Rising edge of H-drive signal
N type
Soft start
H-drive edge
H-fly-back
+
-
+
-
+
-
~500ns
Monostable
P type
Feedback
C2
(IC)
B-drive inhibition
(IC)
(+delay)
(IC)
2R
R
VBReg
I1
I2
I3
VC2
O1
÷2
28
BOut
16
BISense
10
HPosF
14
BComp
15
BRegIn
BOutPol
BOutPh
BOHEdge
VThrBIsCurr
VCO
1
0
1
0
1
0
VCC
C1
S
Q
R
(safety functions)
timing
+
-
B-drive protection at H-unlock
(safety functions)
C3
Safety block
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