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| TDA4855 Datasheet, PDF (27/44 Pages) NXP Semiconductors – Autosync Deflection Controller ASDC | |||
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Philips Semiconductors
Autosync Deï¬ection Controller (ASDC)
Preliminary speciï¬cation
TDA4855
APPLICATION INFORMATION
handbook, full pagewidth
2 VHDRV
2.5 V OTA
7
SQ
RQ
VCC
Vi
R6
6
3 VBDRV
L
D2
INVERTING
BUFFER
TR1
HORIZONTAL
OUTPUT
STAGE
DISCHARGE
1 horizontal
flyback pulse
D1
C1
5
VBIN
R1
R2 C2
R3
3
4
VBOP
4 VBSENS
CBOP
>4.7 nF
R5
C4
R4
MBG599
EWDRV
For f < 50 kHz and C2 < 47 nF calculation formulas and behaviour of the OTA are the same as for an OP. An exception is the limited output current at
BOP (pin 3). See Chapter âCharacteristicsâ, Row Head âB+ control section (see Figs 12 and 13)â.
a. Feedback mode application.
handbook1, fulhl poargizeownidttahl
flyback pulse
2 VHDRV
3 VBDRV
VBSENS = VBOP
4 VBSENS
ton
td(BDRV)
b. Waveforms for normal operation.
toff(min)
VRESTART(BSENS)
VSTOP(BSENS)
MBG600
c. Waveforms for fault condition.
1996 Jul 18
Fig.12 Application and timing for feedback mode.
27
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