tda4855 NXP Semiconductors, tda4855 Datasheet - Page 27

• Manufacturer Part Number: tda4855
• Description: Autosync Deflection Controller Asdc
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
1996 Jul 18
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handbook, full pagewidth
Autosync Deflection Controller (ASDC)
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 “Characteristics”, Row Head “B+ control section (see Figs 12 and 13)”.
1
4
1
2
3
V BSENS = V BOP
horizontal
flyback pulse
V HDRV
V BDRV
V BSENS
horizontal
flyback pulse
b. Waveforms for normal operation.
EWDRV
C1
D1
t on
t d(BDRV)
R1
R3
2.5 V
Fig.12 Application and timing for feedback mode.
5
V BIN
R2
OTA
a. Feedback mode application.
C2
2
V BOP
3
V HDRV
C BOP
4.7 nF
4
4
27
V BSENS
7
DISCHARGE
R
S
c. Waveforms for fault condition.
Q
Q
6
V CC
INVERTING
R6
BUFFER
3
C4
V BDRV
t off(min)
MBG600
R5
Preliminary specification
V i
V RESTART(BSENS)
TR1
V STOP(BSENS)
L
R4
HORIZONTAL
TDA4855
D2
OUTPUT
STAGE
MBG599