TDA9116 View Datasheet(PDF) - STMicroelectronics
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TDA9116 Datasheet PDF : 47 Pages
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Figure 13. EWOut output waveforms
V(EWOut)
VEW-Key
VEW-PCC
TDA9116
VEW-DC
VEW-TCor
VEW-BCor
VEW(max)
HSIZE (I2C)
maximum
medium
Keystone
alone
V(VCap)
0
TVR 0
PCC
alone
Top
Bottom
Corners
alone
minimum
VEW(min)
Breathing
compensation
VHEHT(min)
VRefO V(HEHT)
TVR 0
TVR tVR
Vertical sawtooth
10.6 - DYNAMIC CORRECTION OUTPUT SECTION
10.6.1 - Vertical dynamic correction output
VDyCor
A parabola at vertical deflection frequency is avail-
able on pin VDyCor. Its amplitude is adjustable via
VDC-AMP I2C bus control and polarity controlled
via VDyCorPol I2C bus bit. It tracks with real verti-
cal amplitude and position (including breathing
compensation). It is also affected by C- and S-cor-
rections.
The use of the correction waveform is up to the ap-
plication (e.g. dynamic focus).
10.7 - 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 14. 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.
35/47
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